SU1314960A3 - Immersion pump - Google Patents

Abstract

PURPOSE:To secure the sealing performance without using special sealing by applying a pressure equal to the external pressure to one or both ends or the inside of the sealing part for a rotary shaft and thereby balancing the pressure at the shaft sealing part. CONSTITUTION:An underwater pump 1 is put into water and sunk till it comes in contact with the bottom or any specified place. In this state, the pump 1 receives a constant pressure uniformly throughout the body, and one side of the shaft sealing part 12 receives the water pressure alike. At this time, a pressure adjustment device 2 receives also water pressure from the water supply hole 24, and the water pressure is transmitted to oil chamber 6, 10 through the pressure medium in the pressure transmitting pipe. Thereby, the pressure balances are well maintained at the shaft sealing part 11 between the oil chambers 6, 10 and the shaft sealing part 12 between the oil chamber 10 and impeller casing 7.

Description

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The invention relates to pump construction and to the design of a submersible pump.

The purpose of the invention is to improve the reliability of the discharge of the seal from the pressure drop acting on it.

FIG. 1 shows a submersible pump, a longitudinal section; in fig. 2 — pressure control mechanism with variable volume elements in the form of membranes; in fig. 3 - pressure control mechanism with variable volume elements in the form of bellows; FIG. 4 - pressure control mechanism with protective shells and variable volume elements made in the form of cylinders with pistons.

The submersible pump contains a waterproof engine 1 with an output shaft 2, a chamber 3 with oil in which the engine 1 is placed, an impeller housing 4 with an impeller 5 mounted on the output shaft 2, placed between the chamber 3 of the engine 1 with oil and the actuator housing 4 wheels 5 connecting body 6, inside of which output shaft 2 is placed, and between the last and connecting body 6, buffer oil is made to the cavity 7, two seals 8 and 9 of shaft 2, mounted between the body A of the impeller 5 and the oil cavity 7 and between the oil but cavity 7 and the chamber 3 of the engine 1 with oil, and the pressure control mechanism 10, made in the form of two variable volume hollow elements 11, the cavities 12 of which communicate respectively with the camera 3 of the engine 1 with the oil and oil cavity 7, and the hollow elements 11 installed in protective shells 13 and sealed relative to the latter, with one of the shells 13 communicating with the environment 0 2

sting water pump. The pressure control mechanism 10 is located on the outside of the pump, the second casing 13 is in communication with the water surrounding the pump, and the cavities 12 of the variable volume elements 11 are sealed to each other.

The hollow elements 11 of variable volume can be made, for example, in the form of membranes (Fig. 2), in the form of bellows (Fig. 3) and in the form of pistons installed in the protective shells 13 in the form of cylinders (Fig. 4). The protective shells 13 communicate with the surrounding water through the holes 14, and the hollow elements 11 (with the chamber 3 and the cavity 7 through the nozzles 15 and 16.

Submersible pump works as follows.

The submersible pump is immersed in water and installed at the bottom of the reservoir or on the floor. At the same time, the external surfaces of the pump and the seal 8 perceive the pressure of water.

The pressure control mechanism 10 is also affected by the pressure of the water surrounding the pump, which through the openings 14 of the cavity 12 of the elements 11

variable volume and nozzles 15 and

16 is transmitted to the chamber 3 of the engine 1 dp of oil and the oil cavity 7, JT.e. the pressure in them becomes equal to the pressure from the outside of the pump. This ensures unloading of the seal 9 from the pressure differential acting on it by equalizing the pressure on both sides of the seal 9 and, consequently, reducing the pump reliability by eliminating damage to the seal 9 and water penetration from the housing 4 into the chamber 3 of the engine 1 and oil leakage from the chamber 3

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T 1

FIG. one

Fish.Z

Vut.t

Editor A. Lezhnin

Order 2223/58

Circulation 575 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Compiled by L. Anisimova

Tehred L. Serdyukova Proofreader A. Tsko

Claims (1)

SUBMERSIBLE PUMP containing a waterproof engine with an output shaft, a chamber with oil in which the engine is placed, an impeller housing with an impeller installed on the output shaft, located between the engine chamber with oil and the impeller housing, a connecting housing inside which the output shaft is located and a buffer oil cavity is made between the last and connecting housing, two shaft seals are installed between the impeller housing and the oil cavity and between the oil cavity and the driving chamber a holder with oil, and a pressure control mechanism made in the form of two hollow elements of variable volume, the cavities of which are respectively connected to the engine chamber with oil and an oil cavity, and the hollow elements themselves are installed in protective shells and sealed relative to the latter, one shell communicating with the surrounding a water pump, characterized in that, in order to increase reliability by unloading the seal from the differential pressure acting on it, the pressure control mechanism is located on the outside Sosa, another sheath communicates with the surrounding water pump, and the cavity of variable volume elements are sealed relative to one another. £ V 096Ϊ 1TG ~ ' ^U HS * 1314960 ’