RU2784590C1 - Horizontal pumping unit - Google Patents

Abstract

FIELD: pumping equipment.

SUBSTANCE: invention 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 extracting, petrochemical, chemical, heat and power industries and public utilities. The horizontal pumping unit contains a support frame, an electric motor connected by means of a coupling to a support-seal assembly, in which bearings are installed that perceive radial and axial loads, a suction casing and a sectional centrifugal pump, while the support-seal assembly is equipped with an oil-lifting ring for oil circulation, which located between the bearings that perceive radial and axial loads, while the unit is equipped with one bearing that perceives radial loads, and the housing of bearings that perceive axial loads is located in the suction housing for cooling due to the pumped liquid, while a cavity is formed between the bearing housing and the seal, in which the baffle is installed.

EFFECT: horizontal pumping unit creation.

2 cl, 2 dwg

Description

The invention relates to the field of pumping equipment for stationary pumping of neutral, aggressive, flammable and combustible liquids and can be used in the oil, oil, petrochemical, chemical, heat and power industries and public utilities.

From the existing prior art, a horizontal pumping unit is known, containing a support frame, an electric motor, an input module, a sectional centrifugal pump, a suction unit, a discharge unit and a thrust pump unit. The first section of the pump is combined with the input module and is located with it on a common shaft sealed with a mechanical seal, and the thrust pump assembly is located in the input module assembly, the input module containing two additional radial bearings. (Patent RU No. 2162163, published on January 20, 2001)

The disadvantages of this design is that the input module, combined with the pump, does not allow quick replacement of the pump or mechanical seal when it fails.

The closest in technical essence to the proposed one is a horizontal pumping unit containing a support frame, an electric motor, a sectional centrifugal pump, a suction unit, a discharge unit, a sealed oil-filled thrust chamber in which bearings are installed that perceive radial and axial loads, and an oil cooling system. The cooling system contains a pipe with a radiator placed in the oil bath of the thrust chamber and connected to the suction unit, and an impeller for creating circulation of the pumped liquid in the pipe, fixed on the shaft and placed in the suction unit, separated from the thrust chamber by a mechanical seal. (Patent RU No. 2320896, published on March 27, 2008)

The disadvantages of this design is the complexity of manufacturing a structure for cooling the oil bath of the thrust chamber with the pumped liquid. The second disadvantage is the reduction or failure of the cooling system due to clogging of the pipe and radiator with salts and mechanical impurities contained in the pumped liquid.

The third disadvantage is that when the mechanical seal fails, the liquid enters the thrust chamber, which leads to breakage and further replacement of the entire thrust chamber.

The task to be solved by the utility model is to eliminate these shortcomings, improve operational properties and increase the reliability of the installation.

The problem is solved, and the technical result is achieved due to the fact that a horizontal pumping unit containing a support frame, an electric motor connected by means of a coupling to a support-seal assembly, in which bearings are installed that perceive radial and axial loads, a suction casing and a sectional centrifugal pump, at the same time, according to the invention, the bearing and sealing assembly is provided with an oil lifting ring for oil circulation, which is located between the bearings that perceive radial and axial loads, while the assembly is equipped with one bearing that perceives radial loads, and the housing of bearings that perceive axial loads is located in the suction housing for cooling due to the pumped liquid, while between the bearing housing and the seal a cavity is formed in which a baffle is installed, the cavity communicates with a leak control sensor and with a leak outlet fitting.

The invention is illustrated by the following figures:

In FIG. 1 shows a horizontal pumping unit in assembled form.

In FIG. 2 shows the support-seal assembly and the suction body in section.

1. Base frame

2. Electric motor

3. Support and seal assembly

4. Suction body

5. Centrifugal pump section

6. Expansion clutch

7. Adjustable foot

8. Emphasis

9. Housing of the support-seal unit

10. Seal

11. Bearing (perceiving radial loads)

12, 13. Bearing (perceiving axial loads)

14. Oil lifting ring

15. Shaft

16. Clutch

17. Bearing housing

18. Chipper

19. Leakage fitting

20. Leak control sensor

21. Cavity

The horizontal pumping unit comprises a support frame 1, an electric motor 2 mounted on it, a support-seal assembly 3, a suction casing 4, and sections of a centrifugal pump 5. The support-seal assembly 3 and the suction casing 4 are mounted on the support frame 1 with the stop 8.

The shaft 15 of the support-seal unit 3 on one side is connected to the shaft of the electric motor 2 by means of a compensating clutch bis on the other side with the shaft section of the centrifugal pump 5 by means of the clutch 16.

Sections of the centrifugal pump 5 are mounted on the support frame 1 using adjustable supports 7.

The support-seal assembly 3 consists of a housing 8, a bearing 11 that perceives radial loads, bearings 12, 13 that perceive axial loads, an oil lifting ring 14 located on the shaft 15 between bearings 11 and 12,13, respectively, and a seal 10 to prevent leakage of the pumped liquid.

The support-seal unit 3 and the suction body 4 are interconnected, while the seal 10 and the body 17 of the bearings 12, 13 are placed in the inner cavity of the suction body 4.

Between the housing 17 of the bearings 12, 13 and the seal 10 in the cavity 21 formed on the shaft 15, a bump stop 18 is installed. - sealing assembly 3.

Horizontal pumping unit operates as follows.

The torque from the electric motor 2 to the shaft 15 of the support-seal assembly 3 is transmitted by means of a compensating clutch 6, then the rotation is transmitted to the section of the centrifugal pump 5 by means of the clutch 16.

The pumped liquid through the process pipeline enters the suction housing 4 and then to the section of the centrifugal pump 5, where the kinetic energy of the flow is converted into the potential energy of the pressure of the pumped liquid, having passed all the stages of the sections of the centrifugal pump 5, it enters the consumer with the required pressure.

Bearings 11 and 12, 13 perceive radial and axial loads from the hydrodynamic effect of the pumped liquid on the shafts of the sections of the centrifugal pump 5 and on the shaft 15 of the support-seal assembly 3. The thermal energy released in this case is removed due to the active circulation of oil in the support-seal assembly 3 s using the oil-lifting ring 14, and due to the pumped liquid washing the walls of the housing 9 of the support-seal unit 3 and the housing 17 of the bearings 12, 13.

The protection control system works as follows.

If the seal 10 fails, the pumped liquid enters the cavity 21 under pressure. 9 of the support-seal assembly 3, thereby protecting the bearings 12, 13 and the oil-filled cavity of the support-seal assembly 3 from ingress of the pumped liquid. The leak control sensor 20 communicated with the cavity 21 transmits a signal to the control station about the need for an emergency shutdown of the pumping unit.

Thus, the proposed design provides uninterrupted cooling of the support-seal assembly, improving the performance properties and increasing the reliability of the horizontal pumping unit.

Claims (4)

1. A horizontal pumping unit containing a support frame, an electric motor connected by means of a coupling to a support-seal assembly, in which bearings are installed that perceive radial and axial loads, a suction casing and a sectional centrifugal pump, characterized in that the bearing and sealing unit is equipped with an oil lifting ring for oil circulation, which is located between the bearings that perceive radial and axial loads, while the assembly is equipped with one bearing that perceives radial loads, and the housing of bearings that perceive axial loads is placed in the suction casing for cooling due to the pumped liquid, while a cavity is formed between the bearing housing and the seal, in which the bump is installed. 2. Horizontal pumping unit according to claim 1, characterized in that the cavity communicates with a leak control sensor and with a leak outlet fitting.

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