SU989149A1 - Self-suction centrifugal pump - Google Patents

Description

(54) SELF SUCTION CENTRIFUGAL PUMP

The invention relates to pump engineering, in particular to self-priming centrifugal pumps. A self-priming centrifugal pump is known, which contains centrifugal and vortex wheels 1 3 located on the shaft. The disadvantage of this pump is its low service life and low reliability. Closest to the present invention is a self-priming centrifugal pump, comprising a housing and impellers mounted on the shaft in it on the shaft of a centrifugal and water ring stage, the last of which is placed in the housing with the formation of an annular cavity and has a central hole 2. The disadvantage of this pump is low reliability, as the water control stage, has a smaller service life than the centrifugal stage. The aim of the invention is to increase reliability. This goal is achieved by the fact that in a self-aspirating centrifugal pump comprising a housing and impellers of centrifugal and water-ring stages located on the shaft, the latter of which is housed in the body with the formation of an annular cavity and has an end-ring mounted on the shaft discs springed to each other with cylindrical shoulders arranged concentrically in the central hole of the wheel and forming the chamber, and channels are made in the shaft, along connected to the pressure area of the impeller of the centrifugal stage and the chamber. In the self-priming centrifugal pump, discs have holes with a total area less than the total area of the shaft channels, and

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communicating the annular cavity with the camera.

FIG. 1 shows a self-priming centrifugal pump, longitudinal section; in fig. 2 — node I in FIG. U

The described self-priming centrifugal pump includes a housing 1 and impellers 3 and 4 of the centrifugal and airframe stages located on the shaft 2 on it, the last of which is housed in the housing 1 with the formation of an annular cavity 5 and has a central hole 6. At the same time the impeller 4 the water ring stage is equipped with discs 7 and 8, which are mounted on the shaft 2, and 7 and 8 spring-end disks which are spring-loaded to each other, with cylindrical collars E and 10 arranged concentrically in the central hole 6 of the wheel k and forming the chamber 11, and in shaft 2 Nala 12 connected to the pumping region of the impeller 3 and the centrifugal stage chamber 11. The discs 7 and 8 are provided with openings 13 having a total area less than the total area of the channels 12 of the shaft 2 and 5 soobschayuschye annular cavity 11 with the chamber.

Self-priming centrifugal pump operates as follows.

When starting, the impeller k of the water-ring stage creates a discharge at the entrance to the impeller 3 of the centrifugal stage, as a result of which the working fluid enters the latter and then to the consumer. In this case, the spring-loaded disks 7 and 8 with cylindrical collars 9 and 10 are pressed against the impeller k of the water ring stage and work with it as a single unit. When the pressure is created by a centrifugal stage, the fluid enters the chamber 11 between the disks 7 and 8 through channels 12 and expands them, the impeller t of the water-filled stage ceases to contact the ends with the disks 7 and 8 and acquires the possibility of free running around cylindrical collars 9 and 10 Since in the chamber 11 there remains a liquid preventing this rolling, the wheel remains

stationary, and the disks 7 and B rotate together with the shaft 2. In order to prevent liquid from stagnating in the chamber 11, the disks 7 and 8 have holes 13, and their total area is less than the total area of the channels 12 of the shaft 2, When the pressure drops, the disks 7 and 8, under the action of the springs, they are again pressed against the wheel k and again work with it as a whole.

The use of the present invention improves reliability.

Claims (2)

1. A self-priming centrifugal pump comprising a housing and impellers of centrifugal and water-ring stages located on the shaft, the latter of which is located in the body with the formation of an annular cavity and has a central bore. The wheel of the water-ring stage is characterized by increasing the reliability fitted with shaft-mounted end-sprung discs with cylindrical shoulders arranged concentrically in the central hole of the wheel and forming a chamber, and in the shaft there are channels connected to the pressure area of the impeller of the centrifugal stage and the chamber. 2. Pump according to Claim 1, characterized in that, in order to prevent stagnation of liquid in the chamber, holes are made in the disks having a total area less than the total area of the shaft channels and providing an annular cavity with the camera. Sources of information taken into account in the examination 1.Badeks K and others. Pumps, reference book. M., Mechanical Engineering 1979, p. 233. 2. Centrifugal pumps. Catalog Livenskogo plant fire fighting machine building, NTsS-15, 1971