SU1097824A1 - Centrifugal pump - Google Patents

Abstract

A CENTRIFUGAL PUMP, comprising a housing, an impeller impeller blades mounted on a shaft with a driven and driving discs, on the outer side of the latter of which are impeller blades having shanks with a gear cut, which is in engagement with a gear wheel mounted on a shaft, characterized by that, in order to balance the axial forces in the wide range of operating modes by adjusting the rotation angle of the impeller blades while changing the rotation frequency of the impeller, the gear wheel is mounted on the shaft with Tew rotation, and the blades are spring loaded and are inclined toward the rotation at an acute angle. (L QD cx ND

Description

The invention relates to a pump manufacturing industry, namely, centrifugal pumps with an automatic device for balancing the axial forces arising on the rotor when the mode of operation of the pump changes.

A centrifugal pump is known, comprising a housing and an impeller mounted thereon on the shaft with blades located between the driven and master disks, on the outer surface of the latter of which grooves are arranged with the blades placed in them with movement and elastic elements mounted on the blades are installed in the slots one.

A disadvantage of the known centrifugal pump is the low reliability of the design, due to the imbalance of the rotor arising from the different radial extension of each of the impeller blades from the slots of the drive disk due to the fact that they are not interconnected.

Closest to the proposed technical essence and the achieved result is a centrifugal pump, comprising a housing, an impeller mounted on the shaft with a driven and driving discs, on the outer side of the latter of which are impeller blades having shanks, with gear teeth, which are in engagement with a gear wheel mounted on a shaft rigidly fixed on the latter, and the blades are mounted on bearings and have axes rigidly connected to a gear track 2.

The rigid connection of the rotation of the impeller blades, causes a change in their peripheral radius with the axial displacement of the pump rotor under the action of axial force. This limits the applicability of the device for balancing significant axial forces in a wide range of operating modes, since in this case it is necessary to ensure large movements of the pump rotor. The lack of reliability of the device for balancing the axial forces is due to the fact that the angular rotation of the impeller blades is carried out over a gear connection through which torque is transmitted. This, in addition to wear and the possibility of seizure of the joint, leads to incomplete balancing of axial forces, the magnitude of which depends on the forces of friction and play in the gear joint and the shaft splines. Insufficient reliability is also determined by the location in the housing of additional bearings, on which a sleeve with impeller blades is mounted. Making an additional bearing in the immediate vicinity of the blades of the impeller complicates lubrication and cooling it under the hips, since the impeller has a high suction capacity and significantly increases the temperature of the fluid in the lateral sinus between the disk and the pump casing.

The purpose of the invention is to balance the axial forces in a wide range of operating modes by adjusting the rotation angle of the impeller blades when the rotation frequency of the impeller is changed.

This goal is achieved by the fact that in a centrifugal pump comprising a housing, an impeller mounted on the shaft with a driven and driving discs, on the outer side of the latter of which are impeller blades having shanks with a serrated cut that meshes with the gear wheel, mounted on the shaft, the gear wheel is rotatably mounted on the shaft, and the blades are spring-loaded and inclined in the direction of rotation at an acute angle.

FIG. 1 shows a centrifugal pump, a longitudinal section; in fig. 2 shows section A-A in FIG. one.

The centrifugal pump includes a housing 1 mounted on it on the shaft 2 of an impeller 3 with a follower and leading disks 4 and 5, on the outer side 6 of the latter of which are impeller blades 7 having shanks 8 with a gear on a cutting 9 that meshes with the gear wheel 10 mounted on the shaft 2 rotatably, and the blades 7 are spring-loaded with elastic elements 7 and inclined in the direction of rotation at an acute angle.

The device works as follows.

When the pump is running at high speed, an unbalanced axial force occurs. At the same time, the proportional to the square of the angular velocity of rotation of the wheel 8 increases. The centrifugal force acting on the blades 7. When the centrifugal force acting on the blades 7 exceeds the force of the elastic elements 11, the impeller blades 7 turn in the direction of increasing the radius of their action, resulting in the opposite direction of the axial force. force that balances or significantly reduces the initial axial force.

This embodiment of the centrifugal pump makes it possible to discharge the impeller from the action of axial force in a wide range of operating modes of the pump.

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Claims (1)

A CENTRIFUGAL PUMP, comprising a housing, an impeller mounted thereon on a shaft with a driven and driving disc, on the outside of the last of which are impeller vanes having gear shanks meshed with a gear mounted on the shaft, characterized in that , in order to balance axial forces in a wide range of operating modes by adjusting the angle of rotation of the impeller blades when the impeller rotational speed changes, the gear wheel is mounted on the shaft with the possibility of gate, and the blades are spring loaded and are inclined in the direction of rotation at an acute angle. figl