SU1610086A1 - Vertical centrifugal pump - Google Patents

Abstract

The invention allows to increase the reliability and efficiency of the pump, as well as to simplify maintenance during operation by filling the pressure tank without depressurizing the gas cavity of the buffer chamber. The gas cavity 8 of the pressure tank 7 is connected to the gas cavity of the buffer chamber 1, and above the pressure tank 7 there is a feed tank 9 having a gas cavity 10 and connected to the pressure tank 7 through pipe 11 with valve 12. In feed tank 9, pipe 11 passes from the bottom parts up to the gas cavity 10 and has a feed hole 14 located in the lower part, and the cross-sectional area of the hole 14 is smaller than the cross-sectional area of the pipeline 11. 1 sludge.

Description

Mainebiester refers to hydraulic engineering, in particular to devices for hydraulic shaft sealing of a vertical centrifugal pump,

The purpose of the invention is to increase reliability and simplify maintenance by replenishing lubricant without depressurizing the pump.

The drawing schematically shows a vertical centrifugal pump with a sealing device.

The vertical centrifugal pump contains a buffer chamber 1 pressurized by gas, a sealing device made in the form of housing 2 and contour 3 installed in it, and atmospheric 4 sealing stages that form with the housing 2 an interstage cavity 5 filled with lubricant, capacity 6 for collecting leakages of lubricant and pressure tank 7 with a gas cavity 8, communicated with interstage cavity 5 and located above the buffer chamber 1, the pump is equipped with a feed tank 9 with a gas cavity 10 and pipe 11 with a valve 12, the buffer chamber 1 communicates with the gas 8 of the pressure tank 7, the feed tank 9 is installed above the pressure tank 7, the pipe 11 is fixed in the bottom part of the feed tank 9, the section 13 of the pipe 11 is placed in the tank 9, the food tank 9 communicates with the pressure tank 7 through the pipe 11, In the lower part of the section 13 of the pipeline And, placed in the nutrient tank 9, made the hole 14, the area of which is less than the area of the transverse

pipe section 11, the pump can

be provided with an additional leak collection tank 15. On the feed tank 9, a filler neck 16 can be installed with a stopper 17,

Vertical centrifugal pump operates as follows.

When the pump is operating, the oil entering due to the pressure created by the oil column of height I forms in the cavity 5 a hydraulic seal preventing the penetration of the contaminated gas from chamber I into the cavity 5 of the housing 2 and the atmosphere. The oil leaks from the atmospheric stage 4 of the seal are drained into the tank 15. The oil leaks from the contour stage 3, mixed with the gas filling the buffer chamber 1, form a gas-oil mixture that enters the tank 6,

d

five

0

five

P

five

In the initial operating state, the pressure in the gas cavities 8 and 10 are equal, the valve 12 is open, the throat 16 is sealed with a stopper 17. During pump operation, the initial oil level in the tank 7 decreases, and the pressure in the gas cavity 8 remains almost unchanged. as it is constantly associated with a much larger gas cavity in the buffer chamber 1, the level of oil in tank 9 begins to decrease while the pressure in its gas cavity 10 decreases, the level of oil in tank 9 stops reducing as soon as the gas pressure in cavity 8 rav th 1SHYU total pressure in the gas chamber 10 and the pressure generated by the oil column height h. When the oil level in the tank 7 reaches the level of connection of the pipeline 11, the gas from the cavity 8 through the pipeline 11 enters the cavity 10, equalizing the pressure in the cavities 8 and 10. At the same time, part of the oil from the tank 9 through the opening 14 and the pipeline 11 flows into the tank 7, raising there is a level in it. The small section of the hole 14 and its location in the lower part of section 13 contribute to a better passage of oil from tank 9 to tank 7 and gas from cavity 8 to cavity 10 without clogging hole 14. This process is maintained automatically until the tank 9 is completely empty Next, the oil supply to the shaft seal with oil / occurs due to the oil in block 7, reducing the oil level in it to the level of the bottom,

The replenishment of the tank 7, which is under the pressure of the buffer chamber 1, is carried out as follows. The valve 12 is hermetically sealed, the pressure of the gas cavity 10 is relieved, the plug 17 is opened, and oil is poured through the neck 16. After closing the neck 16 with the stopper 17, the valve 12 is opened and the pressure in the cavity 8 and 10 is equalized through the pipe 11, and through the hole 14 through the pipe 11 the oil from the tank 9 enters the tank 7,

Claims (1)

Invention Formula Vertical centrifugal pump containing a gas-inflated buffer chamber, a sealing device discharged as a housing and contour and atmospheric compaction stages installed in it, forming an interstage cavity filled with Lubrication, a lubricant leakage collecting tank and a pressure tank with a gas cavity communicated with the interstage cavity and located above the buffer chamber, characterized in that, in order to increase reliability and simplify maintenance by replenishing the lubricant without depressurization, the pump It is provided with a feed block with a gas cavity and conduit with the valve, the buffer chamber communicates with the gas cavity of the pressure tank, the feed tank is installed above the pressure tank, the pipeline is fixed in the bottom part of the feed tank, while the pipeline section is placed in the latter, the feed tank is connected to the pressure tank with the help of the pipeline A portion of the pipeline section placed in the feed tank is provided with a hole whose area is less than the cross-sectional area of the pipeline.