RU103864U1 - MULTI-STAGE CENTRIFUGAL PUMP - Google Patents

Abstract

 A multistage centrifugal electric pump, the pump part of which contains working elements assembled on a shaft, for fixing which radial bearings are used during operation, a rotor enters the electric motor, for fixing which radial and thrust bearings are used, characterized in that the outer surface of the inner bearings the sliding of the pump and the electric motor, the end surface of the thrust foot and the outer surface of the bushings of the spacer (thrust) pump are chrome-plated and car idizirovannymi petrol vapor in a mixture with hydrogen.

Description

The utility model relates to the field of pump engineering, in particular, to the design of a centrifugal multistage borehole electric pump, which can be used, for example, for pumping industrial and drinking water with a high content of solids.

Known multi-stage borehole centrifugal electric pump type ETsV4- ... ETsV12 - for pumping water, the pump part of which contains a set of stages, including working bodies assembled on a shaft, for fixing which during operation rubber-metal radial plain bearings are used, the rotor is included in the electric motor for fixing which is used rubber-metal radial and thrust bearings. Water flow is sealed on the pressure part of each stage using rubber sealing sleeves and spacer sleeves (See Electric pump ЭЦВ4- ... ЭЦВ12. Passport АМТ 3.246.001 ПС, Livny, OJSC "Livnynasos", АМТЗ.246.001ТУ).

The disadvantage of this pump is that the working life of parts exposed to intense exposure to a stream of water containing solid solids (sand) is relatively small. In practice, even under good operating conditions, they retain their performance, as a rule, 1.5-2 years. The inner bushings of the radial plain bearings, the end surface of the heel, which is part of the thrust plain bearing, and the spacer (thrust) bushings, despite being made of hardened metal, wear out intensively.

The task that the claimed technical solution solves is to increase the resource and increase the reliability of the internal metal bushings of the radial sliding bearings of the pump part and the electric motor, the butt surface of the heel, which is an integral part of the thrust sliding bearing, and the spacer bushings (thrust).

The problem is solved in that the outer surface of the inner bushings of the radial bearings of the pump and electric motor, the outer surface of the bushings of spacers (thrust) and the end surface of the heel in order to significantly increase the wear resistance is subjected to chromium plating, followed by carbidization in a mixture of gasoline vapor with hydrogen according to the method of academician Arkharov V. AND.

In the drawings, a sectional view shows a multi-stage centrifugal pump (Fig. 1) and a water-filled electric motor (Fig. 2).

Figure 1 - multistage centrifugal pump, for example, a vertical design with "floating" impellers.

A multistage centrifugal pump is a design consisting of fixed and moving (rotating) parts and assemblies during pump operation. Fixed parts and assemblies include: base 1, cages 2, guide devices 3, sealing sleeves 4, interstage disks 5 with locking pins 6, bearing housing 7, outer sleeve of a radial plain bearing 8, couplers 9, valve 10 and valve body 11. The movable (rotating) part of the pump consists of a shaft 12, on which the inner sleeve of the sliding bearing 15 is fixed with a retaining ring 13 on the key 14, the outer surface of which is subject to chrome plating, followed by carbidization, and the heel 16, the workers are fixed on the keys 17 wheels 18 and bushings persistent 19, the outer surface of which is subject to chromium plating with subsequent carbidization. The lower end of the shaft is connected to the rotor of the electric motor by a rigid coupling 20, mounted on the shaft by a key 21.

Figure 2 - asynchronous water-filled electric motor vertical design.

The electric motor also consists of fixed and movable (rotating) units and parts during operation. Fixed parts and assemblies include: bottom 1 with spherical support and pins pressed into it, thrust bearing 2, lower studs 3 with spring nuts and washers, lower ring 4, lower shield 5, external sleeve of the lower sliding bearing 6 fixed in it, stator housing 7, the stator 8 placed in it, consisting of a set of dynamo steel plates, pressure rings 9, stator winding 10, upper shield 11, an external sleeve of the upper sliding bearing 12 fixed therein, upper ring 13, upper studs with spring nuts and washers. Movable (rotating) nodes and parts include: shaft 15, mounted on it with a locking ring 16 and dowels 17, the inner sleeve of the upper sliding bearing 18, the outer surface of which is subjected to chrome plating, followed by carbidization, the balancing ring 19, the rotor 20 made of a set dynamo steel plates, the inner sleeve of the lower plain bearing 21, the outer surface of which is subjected to chromium plating, followed by carbidization, mounted on the shaft with the help of a key 22 and a retaining ring 23, heel 24, the end surface of which is subject to chromium plating with subsequent carbidization, fixed to the shaft with a key 25 and a retaining ring 26.

The pump unit presented for example works as follows.

The electric pump is lowered into the well and put into operation. The electric motor is located at the bottom of the unit. The torque from the electric motor through the coupling 20 (Fig. 1) is transmitted to the pump shaft 12 (Fig. 1) with a set of stages containing the impellers 18 (Fig. 1). The pumped liquid enters the space between the disks of the rotating impellers 18 (Fig. 1) and, under the action of centrifugal forces, moves from their center to the periphery. At the exit of each impeller 18 (FIG. 1), the fluid flow enters the channels between the arcuate protrusions of the guide apparatus 3 (FIG. 1), the interstage disk 5 (FIG. 1) and the cage 2 (FIG. 1), changes the direction of movement from the pressure part of the previous impeller 18 (figure 1) to the suction part of the next impeller 18 (figure 1).

An asynchronous electric motor works when AC enters the stator winding due to the interaction of the magnetic fields of the stator 8 (figure 2) and the rotor 16 (figure 2).

When connecting the pump and the electric motor to the unit, the lower part of the pump shaft 12 (Fig. 1) is connected to the rotor shaft of the electric motor 15 (Fig. 2) using a rigid coupling 20 (Fig. 1). During operation of the electric pump, all these structural elements turn into a system with a single axis of rotation.

Tests have shown that the claimed multistage centrifugal pump has improved technical and operational characteristics. It can work on pumping water with a high content of mechanical impurities.

Claims (1)

A multistage centrifugal electric pump, the pump part of which contains working elements assembled on a shaft, for fixing which radial bearings are used during operation, a rotor enters the electric motor, for fixing which radial and thrust bearings are used, characterized in that the outer surface of the inner bearings the sliding of the pump and the electric motor, the end surface of the thrust foot and the outer surface of the bushings of the spacer (thrust) pump are chrome-plated and car idizirovannymi petrol vapor in a mixture with hydrogen.