SU667689A1 - Centrifugal pump - Google Patents

Description

(54) CENTRIFUGAL - PUMP

one

The invention relates to devices for transferring viscous materials with simultaneous grinding of fibrous inclusions, and is intended, for example, for pumping liquid manure on livestock farms.

A centrifugal pump is known for transferring viscous materials with a chopping device whose working bodies are made in the form of a fixed annular disk with curved notches on the inner surface and a rotating knife that interact with each other 1.

The disadvantage of this pump is the impossibility of efficient grinding of inclusions, since some of them pass in the center of the suction, the nozzle is generally unground, and the viscous and elastic materials envelop the rotating blade, which leads to a decrease in the efficiency of the pump as a whole.

The closest technical solution to the present invention is a centrifugal pump comprising an impeller with a disk and blades, grinding

The device is in the form of a package of ring plates with open internal edges installed inside the housing around the impeller of the pump 2.

The grinding process in it is carried out due to the shock effect of the mass flow thrown by the blades of the impeller on the wavy edges of the annular plates. The impact of the mass flow on the wave-like edges of the annular plates is ineffective and insufficient for grinding various kinds of fibrous and solid inclusions that accumulate in the gaps of the circular plates, which leads to the loss of the working cavity of the pump. In addition, the entry of foreign objects into the pump cavity leads to breakages.

The aim of the invention is to increase the grinding efficiency and operational reliability of the pump.

The goal is achieved in that, in a known centrifugal pump, each blade is provided with a peripheral rotary part, which is a continuation of the profile of the main blade, which is fixed pivotally and has longitudinal teeth that engage with the inner edges of the annular plates.

In addition, a shear pin is installed on the inner face of the impeller disk at the rotary part of each blade.

FIG. 1 shows the proposed na soybean, general view; in fig. 2 is a section along A-A in FIG. one; in fig. 3 - a fragment of the grinding device in the axonometric image.

The centrifugal pump includes a housing 1 with a suction 2 and a pressure 3 nozzles, a shaft 4 and an impeller in the form of a disk 5 with blades 6, each of which is equipped with a peripheral turning part 7, which is a continuation of the profile of the main blade 6 and fixed jointly and having longitudinal teeth 8, incoming; Borrow: er (Leyu with inner edges of the ring plate package 9, grinding device in the pump housing 1 around the impeller. The inner edges of the annular plates can be made in the form of sharp teeth formed by a number of semicircles, or in the form of sharp triangular teeth forms, or in the form of a notch, etc. At the inner end of the disk 5, at the rotary part 7 of each blade 6, a shear 2 pin 10 is installed.

The proposed centrifugal pump works as follows.

The pumped mass, entering the cavity of the pump, is thrown off by the blades 6 to 3 of the inner edges of the annular plates 9 of the grinding device. In this case, the liquid fraction passes through the gaps of the annular plates. The inclusions are retained on the edges of the annular plates, are subjected to the impact of the teeth of the peripheral rotary parts 7 of the blades 6, the annular plates entering the grooves, are crushed and, together with the mass flow, are displaced into the discharge port 3. Larger impurities are subjected to repeated grinding to 40 sizes, not exceeding the gap between the ring plates. When foreign objects enter the pump cavity, the rotary part 7 of the blades 6 is deflected, cutting off the pin 10, and thus preventing breakages.

According to the principle of impact action of the turning parts provided with longitudinal teeth that engage with the sharp inner edges of the annular plates, they increase the efficiency of the inclusions grinding process compared to the passive effect of the mass flow on the undulating edges of the annular plates used in the well-known centrifugal pump. The rotary parts of the blades perform the role of a ground, chewing, blowing and cleaning device.

Such a pump can be used as a separate unit, or as an attachment to centrifugal pumps, ensuring their stable, reliable operation when pumping viscous materials with fibrous inclusions.

Claims (2)

1. A centrifugal pump containing an impeller with discs and blades, a grinding device in the form of a package of annular plates with sharp inner edges, mounted inside the housing around the pump impeller, characterized in that in order to increase the grinding efficiency and operational reliability of the pump , each blade is provided with a peripheral rotary part, which is a continuation of the main blade profile, which is fixed with hinges and has longitudinal teeth that engage with the inner edges of the annular plates. 2. A centrifugal pump according to claim 1, characterized in that, in order to increase the reliability of its operation, a shear pin is installed at the inside end of the impeller disk at the rotary part of each blade. Sources of information taken into account in the examination 1. USSR author's certificate number 365126, cl. A 01 K 1/00, 1970. 2. USSR author's certificate number 418630, cl. F 04 D 7/04, 1971. FIG. And - / 1 e}) ig.g ten