SU1606741A1 - Centrifugal pump - Google Patents

Abstract

The invention is intended to increase the efficiency of centrifugal pumps with half-open impellers. Along the protrusions 7 at the ends of the 4 blades 3 are partitioned plates 8 of conic section. At the same time, the gaps between the blades 3 and the housing are minimal, as a result, the flow of liquid from the working side of the blades 3 to the rear side is reduced. Making the plates 8 and the blades 3 of elastic material simplifies the manufacturing technology. 4 il.

Description

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The invention relates to pump construction, namely, to designs of centrifugal pumps. The purpose of the invention is to increase the efficiency by reducing the liquid overflow from the working side of the blades to the rear side and simplifying the manufacturing technology.

FIG. 1 shows a centrifugal pump; figure 2 is the same, the meridional section; on fig.Z - section aa in figure 2; figure 4 - node I in figure 2.

The centrifugal pump includes a housing 1, a semi-open impeller 2 mounted therein with blades 3, the ends of which 4 are arranged with a gap 5 relative to the housing 1 and are provided with alternating longitudinal grooves 6 and protrusions 7 that are formed on them. arranged in rows along the projections 7 of the ends and inclined in the direction opposite to the direction of rotation of the wheel. The blades 3 and the plate 8 are made of elastic material.

The pump works as follows.

When the wheel 2 rotates on the face of the blades 3, the pressure becomes greater than on the back. Under the action of the pressure drop, the plate 8 is elastically deformed, thus forming the minimum gap between the plates 8 and the body 1, which prevents friction between the plates 8 and the body 1. The sectioning of the plate 8 reduces its flexural rigidity and ensures elastic deformation,

Thus, the minimum clearance between the blades 3 and the pump casing 1, which is provided by elastically deformable conical plates 8, allows a significant reduction in the flow of fluid from the front surface to the rear. At the same time, the efficiency is significantly increased.

and pump head. Using a half-open wheel and a labyrinth device with scallops in the form of elastically deformed partitioned taper plates on the ends of the blades and making them from that

the same material as the blades 2, allow

simplify their manufacture. The wheel 2 with the plates 8 may, for example, be made by casting I9 of an elastic material. The inclination of the plates in the direction of the relative

flow movements facilitate their stress state. The division of the plates 8 into sections allows them to be compensated for their rigidity, due to the fact that they are located along the projections 7 and are bent along the profile

blades 3.

Claims (1)

Claims of the invention: A centrifugal pump comprising a housing, a semi-open impeller mounted therein with blades, the ends of which arranged with a gap relative to the housing and provided with alternating longitudinal grooves and protrusions formed thereon, characterized in that, in order to increase the efficiency by reducing liquid overflow from the working side of the blades to the rear and simplified manufacturing technology; the wheel is equipped with partitioned plates of conic section arranged in rows the protrusions of the ends and inclined in the direction opposite to the direction of rotation of the wheel, while the blades and plates are made of elastic material. 9g.1 (Puz.z Thebes.