RU2806866C1 - Centrifugal pump - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to centrifugal pumping units designed for pumping liquids. The centrifugal pump contains an inlet pipe with a groove for a stationary cutter, an electric cable, a top cover, a bearing cover, a motor housing, a spiral-shaped housing, a semi-open impeller with a blade in the form of two rectangular plates and an impeller with six spiral blades, a mechanical seal cover, a mechanical seal, bearing housing, bearings, motor, oil seal, oil seal cover, water cooling jacket, cooling water inlet, three bearings, circuit board for electrical cable, stationary cutter includes a ring element with a flat surface and twelve evenly spaced holes for screw connection, hollow cylinder, three blades in the form of flat plates.

EFFECT: invention allows to increase reliability and productivity.

1 cl, 6 dwg

Description

The invention relates to the field of mechanical engineering, namely to centrifugal pumping units designed for pumping liquids.

From the prior art (Internet link https://www.youtube.com/watch?v=EmNyPOMqF9g, publication date 05/13/2021) a centrifugal pump is known containing an electrical cable, a top cover, a bearing cover, a motor housing, a spiral-shaped housing, semi-open impeller with impeller with five spiral blades that do not converge to the center of the impeller, mechanical seal cover, mechanical seal, bearing housing, bearings, motor.

This centrifugal pump is the closest analogue of the declared pump.

At the same time, the disadvantage of this centrifugal pump is low reliability and performance, due to the inability to convert the contaminated working environment into a homogeneous state, which leads to rapid adhesion of the working environment to the structural elements, which reduces the pump capacity and rapid wear of these elements, as well as the lack of cooling engine and low degree of fluid flow increase by five spiral blades.

The objective of the present invention is to eliminate the disadvantages described above.

The technical result of the present invention is to increase the reliability and performance of a centrifugal pump.

Such a task and technical result are achieved thanks to a centrifugal pump containing an inlet pipe, an electric cable, a top cover, a bearing cover, a motor housing, a spiral-shaped housing, a semi-open impeller with an impeller with spiral blades that do not converge to the center of the wheel, a mechanical seal cover, an end a seal, a bearing housing, bearings, a motor, wherein this pump additionally contains an oil seal, an oil seal cover, a water cooling jacket, a cooling water inlet, a stationary cutter, three bearings, a mounting plate for an electrical cable, wherein the inlet pipe contains a groove for installing a stationary cutter , the stationary cutter contains a ring element with a flat surface, including twelve evenly spaced holes for a screw connection, a hollow cylinder located in the center of the ring element, three blades forming equal angles with each other and their ends connected to the ring element and the hollow cylinder, some end parts ring element, hollow cylinder and blades are in the same plane, the hollow cylinder has a length greater than the width of the ring element, the blades are made in the form of flat plates and are located at an acute angle to the specified plane, an impeller with six spiral blades is located on the impeller, connected with a knife made in the form of two rectangular plates forming equal angles between themselves, two bearings are installed in the middle part of the shaft, and one bearing is at one end of the shaft, in plan the water cooling jacket extends beyond the ends of the engine, the inlet and outlet of the cooling water are located asymmetrically relative to the shaft rotation axis, the mounting plate for the electrical cable is located at the end of the bearing cover.

An acute angle means that one of the adjacent angles is acute.

Due to the design of the inlet pipe with a groove for installing a stationary cutter, a stationary ring element with twelve evenly spaced holes for a screw connection, the cutter is secured to the pump body by installing the ring element in the groove of the inlet pipe with subsequent fixation with screws. Empirical tests have shown (at a centrifugal pump shaft rotation speed of 1450 rpm) that a number of twelve evenly spaced holes for a screw connection is optimal for distributing force loads on the screws and the rigidity of the cutter, because with a number of less than twelve, force loads led to loosening and self-unscrewing of the screws, and with a number of more than twelve, force loads led to the destruction of the annular element of the cutter, because The rigidity of the ring element was low due to the reduction in the amount of material.

Due to the construction in a stationary cutter with a ring element with a flat surface, a hollow cylinder longer than the width of the ring element, the connection of the ends of the blades with the ring element and the hollow cylinder, the number of blades being three, forming equal angles among themselves, the hydrodynamic resistance in the inlet pipe did not increase compared to its analogue due to the fact that the hollow cylinder and the blades at the other end form an inclined streamlined surface.

Thanks to the blades in the stationary cutter being made in the form of flat plates located at an acute angle to the plane in which some of the end parts of the ring element, the hollow cylinder and the blades are located, it became possible to grind objects or media with a different density located in the working environment to bring it into a homogeneous state.

Due to the implementation of the impeller with six spiral blades that do not converge to the center of the wheel, the speed of rotation of the impeller increases, which leads to an increase in the degree of increase in fluid flow compared to the analogue.

Thanks to the connection of a knife, made in the form of two rectangular plates forming equal angles between each other, with spiral impeller blades, objects or media with a different density located in the working environment that have not been sufficiently processed by a stationary cutter are crushed to bring it into homogeneous state.

Due to the fact that two bearings are installed in the middle part of the shaft, and one bearing is installed at one end of the shaft, it was possible to reduce the likelihood of eccentricity and destructive oscillatory processes compared to the analogue.

Due to the fact that in plan the water cooling jacket extends beyond the ends of the engine, most of the thermal energy from the engine is transferred to the jacket and thereby reduces the likelihood of engine overheating.

Due to the fact that the inlet and outlet of the cooling water are located asymmetrically relative to the axis of rotation of the shaft, it was possible to achieve close to uniform heat transfer between the engine and the cooling jacket. This made it possible to avoid overheating of individual engine parts.

Thanks to the presence of the oil seal and the oil seal cover, leakage of the working medium into the pump through the gaps is prevented.

Due to the location of the mounting plate for the electrical cable at the end of the bearing cover, the cable is rigidly fixed and does not come into contact with other structural elements of the pump.

All the information presented clearly demonstrates an increase in the reliability and performance of the claimed centrifugal pump compared to an analogue, which indicates the achievement of the above technical results.

In fig. 1-5 shows in detail an example of the design features of a centrifugal pump and its components.

Fig. 1 - general view of a centrifugal pump, where:

- pos. 1 - electrical cable;

- pos. 2 - oil seal;

- pos. 3 - oil seal cover;

- pos. 4 - top cover;

- pos. 5 - bearing cover;

- pos. 6 - engine housing;

- pos. 7 - water cooling jacket;

- pos. 8 - cooling water inlet;

- pos. 9 - spiral-shaped body;

- pos. 10 - inlet pipe;

- pos. 11 - stationary cutter;

- pos. 12 - impeller with knife and impeller;

- pos. 13 - mechanical seal cover;

- pos. 14 - mechanical seal;

- pos. 15 - bearing housing;

- pos. 16 - two bearings;

- pos. 17 - engine;

- pos. 18 - cooling water outlet;

- pos. 19 - one bearing;

- pos. 20 - mounting plate for electrical cable.

Fig. 2 - general view of a stationary cutter, where:

- pos. 21 - a circular element in the form of a ring with a flat surface;

- pos. 22 - hollow cylinder located in the center of the ring element;

- pos. 23 - three blades in the form of flat plates, forming equal angles between themselves and their ends connected to a ring element and a hollow cylinder.

Fig. 3 - side view of a stationary cutter, where:

- pos. 24 - plane in which some end parts of the annular element, hollow cylinder and blades are located;

- pos. 25 - the length of the hollow cylinder, which is greater than the width (item 26) of the ring element;

- pos. 27 - streamlining obtained by the fact that the hollow cylinder and the blades at the other end form an inclined surface.

Fig. 4 - front view of a stationary cutter, where:

- pos. 28 - twelve holes evenly spaced on the ring element (item 21) for a screw connection.

Fig. 5 - general view of the impeller, where:

- pos. 29 - impeller;

- pos. 30 - spiral blades that do not converge to the center of the wheel

Fig. 6 - general view of the impeller, where:

- pos. 31 - a knife in the form of two rectangular plates forming equal angles between themselves, connected to spiral impeller blades.

Structural elements of a centrifugal pump are made of the following materials:

- cast iron body;

- impeller, cutter and knife made of stainless steel;

- pump shaft made of carbon steel;

- silicon carbide seals.

The components of a centrifugal pump are connected to each other by assembly operations.

A centrifugal pump works as follows.

The centrifugal pump is installed on a supporting surface, the working medium enters the inlet pipe, the electric motor is turned on and the working medium is pumped, and the objects contained in it and/or media with a different density located in the working medium are crushed to a homogeneous state along with the working medium.

This information shows that the claimed centrifugal pump is described to the fullest extent, allowing a person skilled in the art to implement it, as well as industrially apply it.

Claims (1)

The centrifugal pump contains an inlet pipe, an electric cable, a top cover, a bearing cover, a motor housing, a spiral-shaped housing, a semi-open impeller with an impeller with spiral-shaped blades that do not converge towards the center of the wheel, a mechanical seal cover, a mechanical seal, a bearing housing, bearings, and a motor. , characterized in that it additionally contains an oil seal, an oil seal cover, a water cooling jacket, a cooling water inlet, a stationary cutter, three bearings, a mounting plate for an electrical cable, while the inlet pipe contains a groove for installing a stationary cutter, the stationary cutter contains a ring element with a flat surface, including twelve evenly spaced holes for a screw connection, a hollow cylinder located in the center of the ring element, three blades forming equal angles with each other and their ends connected to the ring element and the hollow cylinder, one end parts of the ring element, the hollow cylinder and the blades are in one plane, the hollow cylinder has a length greater than the width of the annular element, the blades are made in the form of flat plates and are located at an acute angle to the specified plane, the impeller with six spiral blades is located on the impeller, connected to a knife made in the form of two rectangular plates forming equal angles with each other, two bearings are installed in the middle part of the shaft, and one bearing is on one of the ends of the shaft, in plan the water cooling jacket extends beyond the ends of the engine, the inlet and outlet of the cooling water are located asymmetrically relative to the axis of rotation of the shaft, a mounting plate for electrical cable is located at the end of the bearing cover.

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