SU1448112A1 - Centrifugal pump - Google Patents

Abstract

Invention m. B. used in the design of unloading units of rotors of centrifugal pumps from the action of axial forces. The purpose of the invention is to simplify the design of the pump. The pump comprises a casing 1 with a discharge zone, a rotor 2 with impellers 3, a hydraulic unit and a bearing. The hydropus includes an unloading disc 4, which forms with the body 1 cylindrical and face throttling slots 5 and 6. The bearing includes a sleeve 7 placed with a clearance of 8 relative to the rotor 2. The bearing is installed between the last step hydrop and the wheel 3 forming the back sinus with the body 9. Between the rotor 2 and the housing 1, an annular cavity 10 is formed, connected to the bearing clearance 8 and the slit 5 of the hydropy. The annular cavity 10 is in communication with the discharge zone, and the bearing clearance 8 is connected with the central part of the back sinus 9. The gap of the slit 5 of the hydropy exceeds the clearance 8 of the bearing. Such a pump design eliminates an autonomous source of high pressure, erosive wear of the bearing by reducing the pressure drop across it, increasing reliability. 1 il. S (l

Description

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The invention relates to a pump and can be used in the design of the unloading nodes of the rotors of centrifugal pumps from the action of axial forces.

The purpose of the invention is to simplify the design by eliminating an autonomous source of high pressure and improving reliability by eliminating erosive wear of the bearing by reducing the pressure differential across it.

The drawing shows the described pump.

The centrifugal pump includes a housing 1 with a pressure zone, a rotor 2 with impellers 3, a hydrophore, including a discharge disk 4 forming a cylindrical and face throttling slots 5, 6 with the housing, and a bearing including a sleeve 7 positioned with a clearance of 8 relative to the rotor 2, and installed between the hydropy and the impeller 3 of the last stage, forming with the body 1 the rear bosom 9. Between the rotor 2 and the body there is an annular cavity 10 connected to the bearing clearance 8 and the cylindrical gap 5 of the hydropy. The annular cavity 10 is in communication with the discharge zone, and the bearing clearance 8 - with the central part of the rear sinus 9, and the clearance of the cylindrical gap 5 of the hydraulic valve exceeds the clearance 8 of the bearing.

The rotor 2 includes an activation sleeve 11, which forms a gap 8 with the bearing sleeve 7. The annular cavity 10 is in communication with the discharge zone through channel 12. Channel 12 can be connected both to the cavity of the injection nozzle 13 and to the periphery of the posterior sinus 9.

The pump works as follows.

When the rotor 2 rotates, the liquid is supplied from the impeller 3 to the discharge zone of the housing 1 through the discharge port 13 to the discharge line. Part of the fluid through the channel 12 from the discharge zone enters the annular cavity and is divided into two streams: the main flow through the throttling gap 5 is directed to the hydrophores, and the reverse flow through the clearance 8 of the bearing into the back sinus 9. Due to the significant difference in the size of the gaps and pressure drops leakage through the hydropun is many times greater than leakage through the bearing, cooling the working surfaces of the friction sleeves 7 and 11. Hydraulic axial force is sensed by the hydropead, the pressure drop on which is activated into the cylinder 5 and 6.

When the pump feed is changed, the pressure is redistributed at the hydroelectric peaks and the axial forces are automatically unloaded. Due to the fact that the bearing and the hydropus work in parallel, there is no need for consistency in their work when changing the flow,

which increases the reliability and performance of the site, as well as simplifies the design. The bearing, acting as a slide bearing only, was put under a slight pressure drop due only to the pressure difference in the central part of the posterior sinus 9 and where the channel 12 was connected to the discharge zone: the discharge nozzle 13 or the peripheral part of the back sinus 9. When the channel 12 was pushed to the rear periphery sinus 9 drop on

Bearing 0 can be minimized, due only to the magnitude of the dynamic head in the sinus 9. As a result, the flow rate of the fluid passing through the bearing gap 8 and, consequently, the erosive wear of the sleeves 7, 11, decreases.

 elements forming the bearing.

Claims (1)

Invention Formula A centrifugal pump containing a housing with a discharge zone, a rotor with impellers, a hydropump including a discharge disk forming a cylindrical and face throttling slots with the housing, and a bearing including a sleeve placed with a clearance relative to the rotor C and installed between the last step hydropus and impeller forming the rear sinus with the body; an annular cavity is formed between the rotor and the body and connected to the bearing clearance and the cylindrical slit of the hydropy — 0 you are different in that The goal is to simplify the design by eliminating an autonomous pressure source and increasing reliability by eliminating erosive wear of the bearing by reducing surpassing, pressure drop on it, the annular cavity communicates with the discharge zone, and the bearing clearance with the central part of the back sinus, and the gap of the cylindrical gap Hydropy you exceed the bearing clearance.