SU964245A1 - Auger centrifugal pump - Google Patents

Description

one

The invention relates to a pump manufacturing industry, namely to screw centrifugal pumps.

Known centrifugal pump containing the impeller and self-priming device located on the same axis tl J.

The disadvantages of this pump are the presence of complex and unreliable automation and the need to fill the self-priming device with clean fresh water.

The closest to the technical essence of the invention is a centrifugal pump, comprising a housing and sequentially located therein on the shaft and communicated between each other auger and impeller 2 J.

However, this pump has insufficient self-priming.

The purpose of the invention is to improve the self-suction of the centrifugal pump.

This goal is achieved by the fact that the screw is eccentrically located in the housing, and the transfer channel is made with a window located on the side of the screw auger above its portion adjacent to the shaft, the screw and the impeller communicating with each other by means of a conversion channel.

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

The centrifugal pump contains

10, the housing 1 and the screw 3 and the impeller 4 interconnected in it on the shaft 2 and interconnected. over its section adjacent to the shaft 2, with the screw 3 and working. wheel 4 communicates with each other when the transfer channel 5 is supplied with power. The pump operates as follows.

Before the first start-up, liquid is poured into the housing 1;

start-up fluid in the pump remains from the previous start. At start-up, the impeller Ai of the screw 3 located on the same shaft 2 is set to rotate. The liquid enclosed in box-1 in the area of the screw 3 unwinds and forms a liquid ring 7. Due to the fact that the screw 3 is mounted in the housing 1 eccentric, the auger 3 forms air cavities closed through the liquid ring 7 which are transferred from the suction nozzle 8 to the window 6 and further to the impeller 4, and from the pump to the atmosphere. Thus, the air is removed and 15 the liquid is lifted along the suction line through the check valve 9 into the suction inlet 8, then the liquid enters the screw 3, is pumped through the window 6, goes into impeller k. Thus, the self-priming process is terminated and the screw 3 operates as a pre-activated impeller pump.

With an increase in the pump supply above 2, the calculated screw 3 may be resistance and then the pressure in front of the impeller k will be lower than in the suction inlet 8, thereby opening the check valve 10.30 and the liquid will be bypassed directly into the impeller C, the auger 3 .

The use of the proposed invention will allow you to create a compact and lightweight self-priming screw centrifugal pumps.

Claims (2)

1.Catalog. Centrifugal ship electric pumps of types NCV and NCVS, TsIITIhimneGhemash. M., 1973. 2. USSR author's certificate N, cl. F O D 1/04, 1980.