RU67769U1 - AXIAL REDUCED ENGINE-PUMP - Google Patents

Abstract

The axial shaftless motor-pump is designed for pumping liquids. The motor pump comprises a housing, a motor stator mounted therein, and an impeller of the motor pump, which is the rotor of the electric motor. The rotor magnetic circuit is made of electrical steel with a short-circuited aluminum winding and pressed into the impeller of the motor-pump made of light aluminum alloy. The stator of the electric motor is an axial magnetic circuit with grooves in which a three-phase winding is laid. To reduce the gap between the stator and the rotor around the perimeter of the stator, annular grooves of a semicircular section are made in which dielectric rolling bodies are laid. Along the perimeter of the impeller-rotor of the motor-pump, annular grooves of a semicircular section are also made, by means of which the impeller-rotor of the motor-pump is rotatably mounted on dielectric rolling bodies. Due to the reduction of the gap thus obtained, the magnetic resistance is reduced, and therefore the currents necessary to create the required magnetic flux. The required cross-section of the wires of the windings is thereby reduced, and the overall dimensions of the pump unit are improved, its cost is reduced, energy losses are reduced. Performing annular grooves around the stator perimeter of the motor-pump, in which the rolling bodies fit, prevents the rotor from skewing relative to the stator, caused by a large axial electromagnetic force, which can lead to jamming

rotor. Preventing the possibility of such a skew increases the reliability of the pump unit. The implementation of the motor pump without bearings and shaft can improve its overall dimensions. The execution of rolling elements from a dielectric reduces the heating of the pumped liquid due to the reduction of losses due to eddy currents and magnetic hysteresis in the rolling elements. Thanks to this, the efficiency increases.

Description

The utility model relates to power engineering and can be used, for example, for pumping equipment for pumping liquids.

A known pump for pumping petroleum products (see patent No. 2098667, 1997, Bull. No. 34, authors Gaitov B.Kh., Kopelevich L.E., Pismenny V.Ya.), comprising a housing, mounted motor stators and the impeller of the pump, which is the rotor of the electric motor and made in the form of two interconnected rotor disks located between two end surfaces of two stators of the electric motor with the necessary air gaps, moreover, one of the stators of the electric motor is disconnected from the power supply independently of the other, but on The sos is equipped with a shaft mounted in the housing on bearings, on which the impeller is fixed.

However, the design of such a pump does not provide for protection of the stator winding from harmful mechanical and chemical effects of the pumped liquid, which can lead to damage to the insulation of the stator winding with subsequent short-circuiting of the winding. A significant drawback of such a pump is the presence of massive rotor disks made of structural steel, leading to unreasonably large power losses at

eddy currents in the array of rotor disks and magnetic hysteresis, which leads to strong heating of the rotor and, consequently, to large energy losses and a significant decrease in pump efficiency. The absence of windings on the rotor disks reduces the energy performance of the pump as a whole. In addition, steel massive rotor disks have a large mass, as a result of which they worsen the overall dimensions of the pump unit. The role of the windings is performed by structural steel, which has a large active resistance. The shaft connecting the rotors of such a pump must have a sufficiently large diameter and, accordingly, a large mass to transmit torques and bending moments, axial and radial forces, which also leads to a deterioration in the overall dimensions of the pump.

The closest to the claimed utility model in terms of physical nature and the achieved result is an axial centrifugal motor-pump (see patent No. 2284426 (RF), 2006, Bull. No. 27, authors Gait B.Kh., Kashin Y.M and others .) comprising a housing, an electric motor stator mounted therein, which is an axial magnetic circuit with grooves in which a three-phase winding is laid, and a pump impeller, which is the electric motor rotor, the electric motor stator being hermetically separated from the flow part by a dielectric membrane Methods and material. The rotor magnetic circuit is made of electrical steel with a short-circuited aluminum winding and pressed into the impeller of the motor-pump made of light aluminum alloy. Thus obtained freely rotating

the impeller-rotor of the motor-pump is mounted on a fixed axis in the housing.

A significant drawback of such an axial centrifugal motor-pump is the presence of a large air gap between the stator and rotor magnetic circuits, which leads to an increase in magnetic resistance and, consequently, to an increase in currents necessary to create the required magnetic flux (magnetization current), i.e., to increase the required cross section wires of the windings and, consequently, to a deterioration in the overall dimensions of the axial centrifugal pump motor, an increase in its cost and an increase in energy losses ui. The disadvantage of such an axial centrifugal pump motor, like any axial electric machine, is also the presence of a large axial electromagnetic force caused by the attraction of the rotor and stator. This effort leads to premature failure of the bearing assemblies, which reduces the reliability of the motor-pump, and the presence of the bearing assemblies required in the prototype to enable rotor rotation, complicates the design of the motor-pump as a whole. In addition, the skew of the rotor relative to the stator, caused by a large axial electromagnetic force, can lead to jamming of the rotor, which reduces the reliability of the pump unit as a whole.

This utility model solves the problem of reducing the gap between the stator and the rotor of the pump motor, improving its overall dimensions, reducing costs and energy losses, increasing efficiency, simplifying the design and increasing the reliability of the pump unit as a whole.

To do this, annular grooves of a semicircular section are made along the perimeter of the stator of the motor-pump, into which dielectric rolling bodies are laid, and around the perimeter of the impeller-rotor of the motor-pump, annular grooves of the semicircular section are also made, by means of which the impeller-rotor of the motor-pump is installed on the dielectric rolling elements with the possibility of rotation.

Figure 1 shows a General view of the axial shaftless motor pump in the context, figure 2 is an enlarged image of the annular grooves of a semicircular section, figure 3 is a section aa and bb.

The axial shaftless motor pump contains a housing 1, an electric motor stator 2 mounted therein, which is an axial lined magnetic circuit with grooves in which a three-phase winding 3 is laid, and an impeller-rotor 4, along the circumference of which annular grooves 10 of semicircular section are made (Fig. 2). The stator 2 of the electric motor is hermetically separated from the pump flow part 5 by a thin membrane 6 made of dielectric material, and the impeller-rotor 4 made of lightweight aluminum alloy has a lined axial magnetic circuit 8, in the slots of which a short-circuited winding is laid 7. The impeller-rotor 4 by the annular grooves 10 are mounted to rotate on the dielectric rolling elements 9, laid in the annular grooves 11 of a semicircular section (figure 2) around the perimeter of the stator 2.

Axial shaftless motor pump operates as follows. When connecting a three-phase winding 3 of the stator 2 of the electric motor to the supplying three-phase network

creates a rotating electromagnetic moment according to the well-known principle of operation of an induction motor, leading the impeller-rotor 4 in rotation. During the rotation of the impeller-rotor 4, the liquid in the flowing part 5, carried away by the impeller-rotor 4 also comes into rotation. In this case, the liquid in the flow part 5 is affected by centrifugal forces pumping the liquid according to the well-known principle of operation of conventional centrifugal pumps.

The proposed utility model, performing the function of a pump, as well as a prototype, at the same time, unlike it, allows you to: reduce the gap between the stator and the rotor of the motor-pump due to increased structural rigidity due to the large bearing surface of the impeller-rotor due to the placement of rolling elements around the perimeter of the stator and the impeller-rotor, limiting the gap only to the state of the surfaces (roughness and flatness) of the stator and rotor; to improve the overall dimensions of the pump unit, reduce its cost, simplify the design and increase the reliability of the pump unit as a whole due to the performance of the pump motor without bearings and shaft (axis), as well as reduce energy loss and, accordingly, increase efficiency by performing rolling bodies from dielectric, thereby reducing the heating of the pumped fluid by reducing the losses due to eddy currents and magnetic hysteresis in the rolling elements.

Claims (1)

An axial shaftless motor-pump, comprising a housing, an electric motor stator mounted therein, which is an axial magnetic circuit with grooves in which a three-phase winding is laid, and an impeller of the motor-pump, which is the rotor of the electric motor, and the rotor magnetic circuit is made of electric steel with squirrel-cage aluminum winding and pressed into the impeller of the motor-pump, made of light aluminum alloy, characterized in that along the perimeter of the stator of the motor-pump Execute the annular groove of semicircular cross section, which are stacked in the dielectric body rolling, and on the rotor-impeller pump motor perimeter also formed annular groove of semicircular cross section, whereby the rotor-impeller pump motor is mounted on the dielectric rolling elements rotatably.