SU761746A1 - Self-suction scoop pump - Google Patents

Description

The invention relates to the field of pump construction, and more particularly to scoop type pumps designed for pumping liquids at relatively high heads and low flows

A self-priming scoop pump is known, comprising a fixed scoop outlet located © about a rotating housing, the internal cavity of which is in communication with an inlet made in the outlet [1].

A disadvantage of the known pump is its low efficiency, due to the fact that the actual length of the streamlined profile in the area of the suction nozzle of the outlet is much greater than the structural length, since the flow to ensure self-absorption through the hole located in the rear of the fairing profile is detached from the profile machine and closes far in the wake zone, which '(leads to an increase in profile losses.

The purpose of the invention is to increase the efficiency of the pump.

This is achieved by the idea that two holes are made in the inlet, located at the base on the side of the inflowing fluid flow symmetrically with respect to the central plane of the latter, and the entire body is in communication with the inlet by means of the said openings.

In FIG. 1 shows a structural diagram of a self-priming scoop and ⁵ sos; in FIG. .2 - section A — A of FIG. one; on, fit. 3 - section B — B of FIG. 2 with a diagram of the distribution of pressure along the profile of the fairing of the outlet in the area of the inlet openings.

Self-priming scoop pump contains a movable scoop outlet 1 located in a rotating housing 2, the inner cavity 3 of which is in communication with the inlet 4, made in the outlet 1,

Two holes a, b are made in the inlet 4, located at the base of the outlet 1 from the side of the inflowing fluid flow symmetrically with respect to the central plane of the latter, and the cavity 3 of the housing is communicated with the inlet 4 by means of the said openings.

In addition, in the central part of the scoop outlet 1, a hole is made in which communicates the cavity 3 through a valve 5 with a 25 air exhaust pipe (not shown in the drawings).

The pump operates in two modes: self-priming and normal operation.

zo Self-priming mode.

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Before starting the pump, the inner lobe 3 of the rotating casing 2 is filled with liquid. The housing 2 is driven in rotation from a drive motor (in the drawings: not shown). When the housing 2 rotates, the fluid flowing around the profile of the fixed scoop outlet 1 in the ash arrangement of the holes a, b has the pressure diagram depicted in FIG. ... The valve 5 is open, and the valve installed on the branch line (not shown on the carts) is closed.

Normal operation mode.

In normal operation, the valve of the supply line is open, and the valve 5 is closed.

Fluid is sucked through openings a. b into the internal cavity 3 of the rotating housing 2 and is pumped through the outlet 1 to the consumer (not shown in the drawings).

In a pump of this design, the flow around the outlet profile in the zone of location of the openings — the inlet takes place without separation of the flow — which reduces the profile loss and 5 increases the efficiency of the pump.

Claims (1)

-Self-priming scoop pump, Ί0 containing a fixed scoop outlet, located on a rotating casing, the internal cavity of which is connected to the inlet made in the bend, characterized in that, in order to increase K [PD, there are two holes in the inlet, α-located at the base of the outlet from the side of the flowing fluid flow symmetrically with respect to the central plane of the latter, and the cavity of the housing 20 is in communication with the β-inlet through the aforementioned holes.