SU731058A1 - Pump - Google Patents

Description

pressure internal cavity, holes and channels, made respectively from the inlet and outlet of the screw, and the ring is spring-loaded relative to the fairing and located on the outer surface of the shaft in the area of the holes, and the shaft is connected to the flow through part of the pump through the channels the movement of the ko.Potsa, and uiruga shell is fastened to the latter.

The drawing shows the pump, a longitudinal section.

The pump includes a housing 1 with a disposable screw in it with a front-mounted auger 2 and an centrifugal impeller 3 mounted on shaft 4, having a hollow fairing 5 with windows 6. The fairing 5 is provided with an elastic sheath 7 and communicates with pressure zone 8 of the pump 8.

The shaft 4 has a nnzkiy pressure connected to the nstochnik: 1en1 (not shown) inside the cavity 9, the holes 10 and the channels 11, made respectively from the input and output in the bacon 2.

The shaft 4 is also provided with a ring 12, a spring loaded and a spring 13 and located on the outer surface of the wa.ch 4 in the area of the holes 10. The cavity 9 of the shaft 4 is connected to the flow part of the pump through the channels 11 permanently and shifted through the ring 12, on which fixed elastic obyyuchka 7.

The pump works as follows.

In case of rotation of the shaft 4, the gas-liquid mixture enters the speck 2, and then into the aperture wheel 3.

In the mode without countercurrent (, 5) pressure in the zone of pagpetani 8 is relatively pelenelpko, n therefore, OIO cannot significantly change the configuration of the elastic shell 7, which is adjacent to the iolom fairing 5. At the same time, the ring 12, is in the edge and right side, blocking the openings 10 i of the osenarities in the pinch 2, the gas phase through the channels 11 enters the internal floor 9 of the shaft 4, further to the source of pressure.

When operating the pump, the paired flow rates (, 5), when the inlet to the screw 2 is nrotowhok, the pressure in this pigeetaine 8 increases and becomes sufficient to stretch the sheath 7 (in the drawing, the new position is shown by a dotted line ). At the same time, an unbalanced axial force appears, by the action of which the ring 12, compressing the spring 13, moves to the left, opening the holes 10. Starting from this moment, a portion of the gas phase detected in the screw 2 from the internal cavity 9 of the shaft 4 is fed through the holes 10 into the region a thinning of the stretched ynpyi-oii sheath 7, which in this case plays the role of a cavitator, as a result of which an artificial cavity is formed behind it, which overlaps a part of the entrance section to the naero directly in front of the screw 2, and also part of the passage section Its flow part. In this case, the axial velocity of the flow in front of the speck 2 increases, the value of the flow parameter d becomes greater than the CBoeio of the critical value of dcr 0.5 and the countercurrents disappear.

The liquid phase, regardless of the mode of operation of the pump, after the screw 2 is sent to the centrifugal wheel 3 and further to the consumer.

MouiHOCTb, which is spent on the formation of an artificial cavity, does not exceed a tenth of a percent of the power consumed by the pump, i.e. it is sensible in the overall energy balance of the pump. In other words, the bypass of the privately separated gas that is compressed in the neck of the gas to the area of rarefaction behind the stretched outer membrane does not practically affect

Pasas efficiency.

Thus, this pasos provides automatic control of the counterflows of the lia at the entrance of the passport to the main costs of the railway system, as a result of which its carrying capacity is increased and self-oscillatory modes of operation are eliminated.

Formula and 3 about b ete e and p

The pump, comprising a housing with pre-key speck in it and a chain-throwing impeller mounted on the shaft, has a hollow cowl with oxides, equipped with an unary sheath and communicated in the pumping zone of the pump, from TCiM, that and the higher flow capacity and eliminated self-oscillating directions of work on the continuous flow rates of gas-flow environments, the shaft has an internal floor, connected to the low pressure source, openings and channels broken out respectively Pieck's inlet and outlet, and a ring, spring-loaded relatively to the fairing and placed on the first and the surface of the shaft in the area of the holes, and the shaft's shaft are communicated with the flowing part of the pasos through the channels), and through the holes - with the displacement; This shell is fixed in late days.

And stochi and Ki; information taken into account during eenertiz

1. The patent of England L 1449450, cl. F iC. 1976.

2. Autorekoy certificate number 505824, cl. F 04 D 15/00, 1974.

Claims (2)

Claim A pump comprising a housing with an upstream screw located therein and a centrifugal impeller mounted on a shaft having a hollow cowl with windows, provided with an elastic shell and communicated with the pump discharge zone, characterized in that, in order to increase the suction capacity and eliminate self-oscillating modes of operation at reduced costs when pumping gas-liquid media, the shaft has an internal cavity connected to the low pressure source, holes and channels, respectively made from the input side and output the screw and the ring and spring-loaded relative to the fairing located on the outer surface of the shaft in the region of the openings, and the shaft cavity is in communication with the flow channels of the pump through continuously, and through the holes - while moving the ring and the elastic shell is fastened on the latter. Both the source and the formations taken into account during the examination 1. England patent λ ° 1449450, cl. F 1C. 1976. 2. USSR author's certificate No. 505824, cl. F 04D 15/00, 1974.