RU191869U1 - Vertical single-stage centrifugal pump unit - Google Patents

Abstract

A vertical single-stage centrifugal pump assembly mounted on a common frame is proposed, including a vertically oriented drive electric motor, a pump shaft, with a two-way inlet impeller mounted on it, a coupling connecting the pump and electric motor shafts, inlet and outlet channels, and a guiding apparatus-body. In this case, the spike of the pump shaft is connected to the guiding apparatus-housing by means of a field bearing assembly based on a sliding bearing. The field bearing assembly contains two lubrication and cooling chambers - an external, horizontally oriented chamber, and an internal, vertically oriented chamber, through which fluid under pressure is continuously circulating through pipelines connected to the guiding apparatus-body. The technical result is an increase in reliability, resource and efficiency, reducing noise and vibration. 4 ill.

Description

The utility model relates to the field of pump engineering, namely, to the design of a vertical single-stage centrifugal electric pump unit for pumping water, aqueous solutions, as well as liquids similar to it, through main, technological and auxiliary pipelines.

The closest technical solution selected for the prototype is a centrifugal single-stage pump, see RF patent No. 80905 of 02.27.2009. This pump with a two-way inlet impeller contains a housing with covers, a shaft, self-aligning packing rings located in the fairings, and a mechanical seal. Moreover, it is equipped with thrust bearings installed in the covers and an additional mechanical seal located on the free end of the shaft and eliminating the effect of excessive pressure on the pump inlet, while the impeller is made of two halves that are split in a vertical plane of symmetry, between the main disks of which a cavity is formed, connected in its peripheral part by openings with the inter-blade space of the impeller, this cavity being connected by radial and axial openings E in the shaft with an area of contact pairs of friction-thrust sliding bearings and mechanical seals. The disadvantage of this device is the design complexity and, as a result, the lack of reliability.

The main general objective of the proposed utility model is the creation of a vertical single-stage centrifugal electric pump unit with improved technical and economic characteristics, specifically with reduced noise and vibration, increased reliability, resource and efficiency through a complex of design improvements combined in a single inventive design in the basic components of the unit.

The technical result is an increase in reliability, resource and efficiency, reducing noise and vibration.

The technical result is achieved by the fact that a vertical single-stage centrifugal pump assembly mounted on a common frame includes a vertically oriented drive motor, a pump shaft, with a two-way inlet impeller mounted on it, a coupling connecting the pump and motor shafts, input and output channels, a guiding apparatus housing. In this case, the pump shaft spike is connected to the guiding apparatus-housing by means of a field bearing assembly based on a sliding bearing, and the field bearing assembly contains two lubrication and cooling chambers - an external, horizontally oriented chamber, and an internal, vertically oriented chamber, through which it circulates continuously fluid under pressure supplied by pipelines connected to a guiding apparatus-body.

The utility model is illustrated by figures 1-4.

FIG. 1 - Vertical single-stage centrifugal pump unit, front view.

FIG. 2 - Vertical single-stage centrifugal pump unit, left view.

FIG. 3 - Vertical single-stage centrifugal pump unit, section along the main plane.

FIG. 4 - Vertical single-stage centrifugal electric pump unit, type A - plain bearing.

Vertical single-stage centrifugal pump unit consists of:

1 - pump

2 - drive electric motor,

3 - frame

4 - coupling

5 - inlet channel

6 - outlet channel

7 - case - guide apparatus,

8 - cover

9 - shaft

10 - impeller,

11 - block bearings

12 - end seal,

13 - pipe external cooling of the bearing,

14 - pipeline lubrication and internal cooling of the bearing,

15 - rotary sleeve of a plain bearing,

16 - the stator sleeve of the plain bearing,

17 - the bearing housing,

18 - the cover of the bearing,

19 - rotor nut,

20 - studs for mounting the plain bearing housing

21 - the outer chamber of the plain bearing,

22 - the inner chamber of a plain bearing,

23 - channel duct external cooling of the bearing.

The proposed vertical single-stage centrifugal pump unit operates as follows.

The drive motor 2, through the coupling 4 transmits torque to the pump shaft 9, as a result, mounted on the shaft 9, the impeller 10 captures the liquid in the housing - the guide apparatus 7 and directs the fluid flows from the horizontal inlet channel 5 to the horizontal outlet channel 6 The impeller 10 is fixed to the shaft 9 by any known means, for example, by means of a key. In this case, the impeller 10 is made of a bilateral entrance.

In addition, the shaft of the pump 9 is fixed in the housing - the guide apparatus 7 - bearings. In the upper axle of the pump shaft 9 — by any bearings, for example, by the rolling bearing block 11, and in the lower axle — by a thorn by means of a field bearing assembly based on a sliding bearing.

The bearing assembly based on the plain bearing is made in the form of:

- the housing of the bearing 17, fixed in the housing - the guide device 7, and forming in its shape a horizontally oriented chamber 21 in the form of an outer ring adjacent to the housing - the guide device 7,

- the cover of the sliding bearing 18, attached to the housing of the sliding bearing 17, for example, by means of studs 20, and forming an inner vertically oriented chamber 22,

- the stator sleeve of the sliding bearing 16, mounted in the housing of the sliding bearing 17, for example, pressed and

- the rotary sleeve of the sliding bearing 16, mounted in the lower journal - the spike of the pump shaft 9.

In addition, in the housing - the guiding apparatus 7 there is a channel for the external cooling duct of the sliding bearing 23, due to which the liquid enters under the pressure of the pressure into the outer chamber of the sliding bearing 21 and from there it is discharged through a pipe 13 to the area of the outlet channel 6 or the adjacent part of the housing - the guiding apparatus 7.

Also, similarly, in the housing - the guide apparatus 7, a channel for the internal flow of the sliding bearing (made not shown in the figures) is made, due to which the fluid enters under the pressure of the pressure into the inner chamber of the sliding bearing 22 and from there it is discharged through a pipe 14 to the area of the outlet channel 6 or adjacent to it parts of the body - guide vane 7.

Also, the pump shaft 9 with its upper pin can be additionally fixed in the housing - the guide device 7 by means of a sliding bearing with the formation of an annular chamber into which liquid is similarly supplied under pressure of pressure and is discharged into the area of the outlet channel 6 or the adjacent part of the housing - the guide device 7 .

Thanks to the vertical installation of the rotary sleeve of the sliding bearing 16, the ergonomics of the pump unit are increased, vibration and noise are reduced, the efficiency is increased due to the fact that the pump rotor is installed in the vertical position, and the load of the rotor on the rolling bearing is reduced, and the use of the sliding bearing allows you to damp rotor vibrations in the radial direction.

And thanks to the original design of the channels of the external cooling duct, the reliability and service life of the pump unit are increased due to the fact that a stably low temperature of the friction surfaces of the sliding bearing is ensured, which slows down the formation of microcracks on these surfaces preceding their destruction.

Claims (1)

A vertical single-stage centrifugal pump assembly mounted on a common frame, including a vertically oriented drive motor, a pump shaft, with a two-way inlet impeller mounted on it, a coupling connecting the pump and motor shafts, input and output channels, a guiding apparatus-body, characterized in that that the spike of the pump shaft is connected to the guide apparatus-housing by means of a field bearing assembly based on a sliding bearing, while the field bearing assembly The unit contains two lubrication and cooling chambers - an external, horizontally oriented chamber, and an internal, vertically oriented chamber, through which fluid continuously circulates under pressure of a pressure, which flows through pipelines connected to a guiding apparatus-body.

Images