RU2784269C1 - Horizontal pump unit - Google Patents

Abstract

FIELD: pumping equipment.

SUBSTANCE: 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. 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, while the support-seal assembly is equipped with an external oil pump and a radiator with forced cooling providing oil circulation, while bearings that perceive axial and radial loads are placed on bushings, between which springs are installed, and a cavity is formed between the bearing housing and the seal, in which the bump is installed.

EFFECT: invention is aimed at improving the operational properties and increasing the reliability of the installation at high loads.

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.

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

The problem to which the invention is directed is to eliminate these disadvantages, improve performance and increase the reliability of the installation at increased loads.

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 unit is equipped with an external oil pump and a radiator with forced cooling that provides oil circulation, while the bearings that perceive axial and radial loads are placed on bushings, between which springs are installed, while a cavity is formed between the bearing housing and the seal. which the baffle is installed, the cavity is in communication with the leak control sensor and with the 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. Compensating clutch

7. Adjustable foot

8. Emphasis

9. Housing of the support-seal assembly

10. Seal

11, 12. Bearing (perceiving radial loads)

13. Three-row bearing (perceiving axial loads)

14. Shaft

15. Top fitting

16. Clutch

17. Bottom fitting

18. Bearing sleeve item 12

19. Bearing sleeve item 13

20. Spring

21. Leakage fitting

22. Leak control sensor

23. Chipper

24. 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 14 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 with the help of adjusting supports 7.

The support-seal assembly 3 consists of a housing 8, bearings 11, 12 that perceive radial loads, and a bearing 13 that perceives axial loads. Bearings 12 and 13 are placed on bushings 18, 19, respectively, on shaft 14. Springs 20 are installed between bushings 18, 19 for the preload necessary for the smooth operation of bearings 12, 13. shown) through the upper fitting 15 and the lower fitting 17 for forced cooling, providing oil circulation in the support-seal unit 3.

The seal 10 to prevent leakage of the pumped liquid is installed on the shaft 14 of the support-seal assembly 3 located in the cavity of the suction housing 4.

In the housing 9 of the support-sealing unit 3 between the bearing 13 perceiving radial loads and the seal 10 in the formed cavity 24 on the shaft 14, a bumper 23 is installed. case 9 of the support-sealing assembly 3.

Horizontal pumping unit operates as follows.

The torque from the electric motor 2 to the shaft 14 of the support-seal assembly 3 is transmitted through the compensating clutch 6, then the rotation is transmitted to the section of the centrifugal pump 5 using 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, 12 and 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 the shaft 14 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 using remote oil pump and forced-cooled radiator (not shown).

The protection control system works as follows.

If the seal 10 fails, the pumped liquid enters the cavity 24 under pressure. sealing unit 3, thereby protecting the bearings 12, 13, the oil-filled cavity of the support-seal unit 3 from ingress of the pumped liquid. The leak control sensor 22 communicated with the cavity 24 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. 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 external oil pump and a forced-cooling radiator that circulates the oil, while the bearings that perceive axial and radial loads are placed on bushings, between which springs are installed, and a cavity is formed between the bearing housing and the seal, in which a bump stop 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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