RU208125U1 - VERTICAL ELECTRIC CENTRIFUGAL UNIT - Google Patents

Abstract

The utility model relates to the field of pumping equipment for stationary pumping of neutral, corrosive, flammable and combustible liquids and can be used in the oil, oil, petrochemical, chemical, heat and power industries and public utilities. The vertical electric pump unit includes a base plate, a pump section vertically mounted on it with an electric motor, the drive shaft of which is connected to the working shaft of the pump section by means of a magnetic coupling, consisting of a driving coupling half mounted on the drive shaft, a driven coupling half mounted on the working shaft, and a sealed cup between them, the suction housing with the suction pipe, the cavity with the discharge pipe is made in a separate housing, installed above the housing of the pump section and hydraulically connected to the magnetic coupling.

Description

The utility model relates to the field of pumping equipment for pumping neutral, aggressive, flammable and combustible liquids under stationary conditions and can be used in the oil, oil-producing, petrochemical, chemical, heat-and-power industries and in the municipal economy.

Known vertical electric pump unit containing a base plate, on which are installed vertically communicated with each other by means of a bypass pipe two pump sections with their own electric motors, the drive shaft of each of which is connected to the working shaft of the pump section by means of a magnetic coupling located in a separate housing made with stiffening ribs , the casing of the pump section, in the upper part of which the discharge pipe is located, the support cup, in which the support of the shaft sliding bearing and the suction pipe is installed, located on the side surface of the support cup (patent RU 196491 published 03.03.2020). The magnetic coupling consists of a leading half-coupling installed on the drive shaft, a driven coupling half installed on the working shaft, and a sealed cup between them.

The disadvantage of this unit is insufficient reliability due to ineffective cooling of the magnetic coupling.

Closest to the claimed one is a vertical electric pump unit containing a base plate, a pump section mounted on it with an electric motor, the drive shaft of which is connected to the working shaft of the pump section by means of a magnetic coupling, consisting of a leading half-coupling installed on the drive shaft, driven coupling half installed on the working shaft, and a sealed cup between them, a suction casing with a suction inlet. The working shaft of the pump section is made with an axial channel and has radial holes; plain bearings are used as a support for the working shaft. In the upper part, the casing of the pump section is equipped with a discharge nozzle, opposite which the discharge cavity is located. The discharge cavity is hydraulically connected through a series-connected working gap in the sliding bearing of the working shaft, the radial gap formed between the sealed sleeve and the driven coupling half, the axial channel made in the working shaft, and the working gap of the sliding bearings located at the end of the working shaft from the side of the input to the working steps, while the value of the plain bearing clearances is from 0.0005 to 0.005 of the outer diameter of the sleeve of the radial plain bearing (patent RU 2326270 publ. 10.06.2008).

The disadvantage of this useful model is the placement of the discharge pipe in the upper part of the pump section casing, which is a technologically complex manufacturing process and requires a high level of production equipment from the manufacturer. In addition, the placement of the discharge nozzle in the pump section housing leads to an increase in the cost of the entire electric pump unit, since it entails the use of materials resistant to the pumped medium used for the manufacture of housing parts.

The task to be solved by the utility model is to improve the manufacturability of the electric pump unit, its reliability and durability.

The technical solution to which the utility model is directed is to protect the magnetic coupling from overheating by accelerating its cooling process due to the increased flow of the pumped liquid into the radial gap between the driven coupling half and the sealed glass of the magnetic coupling.

The specified technical result is achieved due to the fact that in a vertical electric pump unit containing a base plate, a pump section with an electric motor vertically mounted on it, the drive shaft of which is connected to the working shaft of the pump section by means of a magnetic coupling consisting of a driving half-coupling mounted on the drive shaft, a driven half-coupling installed on the working shaft and a sealed cup between them, a cavity with a discharge pipe, a suction housing with a suction pipe, bearings for supporting a working shaft made with central axial and radial holes, according to the utility model, the cavity with a discharge pipe is made in a separate housing installed above the casing of the pump section and hydraulically connected to the magnetic coupling.

For ease of assembly and increasing the number of working stages in the unit to increase the pressure characteristics, the pump section housing can be made composite, and its parts are interconnected, with each part of the pump section housing having its own working shaft on which the working stages are installed.

Also, to direct the flow of the pumped liquid and reduce cavitation in the electric pump unit, before entering the working stages, a screw is installed on the working shaft.

The essence of the utility model is illustrated by drawings

FIG. 1 shows a vertical electric pump unit

The vertical electric pump unit includes

1. Electric motor

2. Pump section housing

3. Stove

4. Lantern

5. Magnetic clutch

6. Driven coupling half

7. Leading coupling half

8. The glass is sealed

9. Combined bearing unit, upper

10. Discharge casing

11. Suction body

12. Discharge branch pipe

13. Suction branch pipe

14. Drive shaft

15. Working shaft

16. Axial channel

17. Auger

18. Combined bearing unit, bottom

19. Working steps

20. Hole (channel)

21. Rib

The pump section with its drive motor 1 is installed vertically on the base plate 3. The drive shaft 14 of the electric motor 1 is connected to the working shaft 15 of the pump section by means of a magnetic coupling 5, consisting of a driving half coupling 7 mounted on the drive shaft 14, a driven coupling half 6 mounted on the working shaft 15, and a sealed cup 8 between them. The sealed cup 8, in turn, is installed on the upper part of the discharge casing 10. The magnetic coupling 5 around the contour covers the lantern (adapter) 4, and as a support connects the electric motor 1 with the discharge casing 10 by means of flange connections. On the side wall of the casing 10, there is a discharge pipe 12 horizontally. In the inner cavity of the discharge casing 10, on the working shaft 15, there is an upper combined bearing assembly 9, which receives axial and radial loads acting on the working shaft 15, a rib 21 is placed on the inner surface of the wall of the discharge body 10 , in the pumping casing 10 in its upper part there are holes 20 for hydraulic connection with the sealed cavity of the magnetic coupling formed between the driven coupling half 6 and the sealed cup 8. Below the pumping casing 10 there is a casing of the pump section 2 and is coaxially connected to the latter by means of flange connections. In the casing of the pump section 2, on the working shaft 15, the working stages 19 of the electric pump unit are installed, at the inlet to the working stages 19, on the working shaft 15, a screw 17 is installed. branch pipe 13, in the inner cavity of the suction casing 11, a lower combined bearing assembly 18 of the working shaft 15 of the electric pump unit is installed, the suction casing 11 is mounted on the base plate 3 and fixed to it by means of a flange connection.

The vertical electric pump unit works as follows.

An external moment from the drive shaft 14 of the electric motor 1 drives the working shaft 15 of the pump section into rotation using a magnetic clutch 5. The pumped liquid enters the pump section through the suction pipe 13, then, under the action of centrifugal force from interaction with the working stages 19 of the pump section, the liquid increases its pressure , after which it enters the discharge casing 10, from where the main part is removed from the pump section through the discharge nozzle 12 with the pressure required for the consumer, and the remaining part of the pumped liquid entering the discharge casing 10 through axial holes 20 made in the discharge casing 10 enters the radial the gap between the driven coupling half 6 and the sealed sleeve 8 for cooling the magnetic coupling 5 as a whole and is discharged through the axial channel and radial holes in the working shaft 15 located below the magnetic coupling 5.

The location of the axial channels in the discharge casing accelerates the cooling process of the magnetic coupling due to the increased flow of the pumped liquid into the radial gap between the driven coupling half and the sealed sleeve of the magnetic coupling, thereby protecting against overheating and increasing the service life of the vertical electric pump unit.

Claims (3)

1. Vertical electric pump unit containing a base plate, a pump section with an electric motor vertically mounted on it, the drive shaft of which is connected to the working shaft of the pump section by means of a magnetic coupling, consisting of a leading half-coupling, installed on the drive shaft of an electric motor, driven coupling half installed on the working shaft pump section, and a sealed cup between them, a cavity with a discharge nozzle, a suction casing with a suction nozzle, bearings for supporting a working shaft made with central axial and radial holes, characterized in that the cavity with a discharge nozzle is made in a separate casing installed above the casing pump section and hydraulically connected with a magnetic coupling. 2. Vertical electric pump unit according to claim 1, characterized in that the pump section housing is made integral, and its parts are interconnected. 3. A vertical electric pump unit according to claim 1, characterized in that an auger is installed at the entrance to the working stages on the working shaft.

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