MULTISTAGE CENTRIFUGAL PUMP WITH TWO PARALLEL FLOWS OF PUMPED MEDIUM

Abstract

The invention relates to the field of pump design. A multistage centrifugal pump with two parallel flows of pumped medium comprises a housing consisting of two separate parts, each of which contains impellers and guide apparatus, and a central pressure cover mounted between said parts of the housing. A delivery pipe is vertical and centrally oriented. The pump additionally includes an end transfer cover for transferring fluid from the first part of the housing to the second part via transfer channels provided integrally with the pressure cover and the transfer cover. The impellers are arranged in the first and second parts of the housing such as to be opposed to one another in relation to the central pressure cover. The first part of the housing comprises a horizontal suction pipe and a vertical discharge pipe, which are disposed on the drive side of the pump and are configured in the form of a single cast part. The discharge pipe is connected by a transfer pipe to an annular chamber in the central pressure cover. The invention is directed toward simplifying the installation, assembly and repair of the pump in an operating environment, reducing the length of the pump piping, and allowing for disassembly and repair of the wet end of the pump without disconnecting the suction and discharge pipes.

Claims

1. A centrifugal radially split pump with two parallel flows of pumped medium, configured as a pump casing comprising two individual portions, each accommodating impellers and guide vanes and a central discharge cover installed therebetween, with a vertical centrally oriented discharge pipe, wherein further provided is a transfer end cover for transferring liquid from the first portion of the casing to the second portion of the casing via transfer channels provided in the discharge and transfer covers and integral therewith, and the impellers mounted on the shaft and accommodated in the first and second portions of the casing are disposed opposite each other relative to the central discharge cover, characterized in that the first portion of the pump casing comprises a horizontal suction pipe and a vertical discharge pipe disposed on the drive end of the pump and configured as a single cast part, wherein the vertical discharge pipe is connected by a transfer pipe to the annular chamber of the central discharge cover.

Description

[0009] The invention will be explained by a figure

[0010] FIG. 1 is a centrifugal sectional pump with two parallel flows of pumped medium.

[0011] FIG. 2 a dismantling and mounting diagram of the flow portion of the present pump.

[0012] The centrifugal radially split pump with two parallel flows of pumped medium consists of: [0013] 1—suction pipe, [0014] 2—first-stage impellers, [0015] 3—central discharge cover, [0016] 4—transfer pipes, [0017] 5—second-stage impellers, [0018] 6—transfer cover, [0019] 7—transfer pipe of the annular chamber of the central cover; [0020] 8—discharge pipe, [0021] 9—discharge flange of the suction cover.

[0022] The present centrifugal pump operates as follows: the pumped liquid first enters the suction pipe 1, then moves into the first stage impeller, and then into subsequent impellers of the second stage of the first package of sections, then enters the annular chamber of the central discharge cover 3, therefrom, via the transfer pipes 4, it is transferred to the annular chamber of the transfer cover 6, then to the impeller of the first stage, and subsequent stages 5 of the second package of sections, then transferred through the transfer pipe 7 of the annular chamber of the central cover 3 to the discharge pipe 8 installed at the beginning of the first stage and then ejected into the discharge flange of the suction cover 9 at a predetermined pressure and flow rate. Further, the pump design comprises a suction pipe 1 and a discharge pipe 8 disposed on the drive end of the pump and configured as a single cast part with different annular chambers, a suction chamber and discharge chamber.

[0023] The present invention is devoid of the disadvantage of the first U.S. Pat. No. 2,529,979, i.e. of a hydraulic balancing device. Thanks to the original disposition of the pipes, it is devoid of the disadvantage of U.S. Pat. No. 2,600,662, i.e. a non-typical (central) disposition of the discharge pipe and additional support legs (four legs instead of six legs); further, the advantage of a pump with an opposite arrangement of impellers in order to compensate for axial forces is maintained, which fact improves the reliability of pump design and makes the pump serviceable in field conditions, thus significantly reducing operating costs.

[0024] The MAIN advantage of the present invention is the possibility of dismantling and repair, as well as the possibility of mounting of the flow portion of the pump without disconnecting the suction and discharge pipelines, as shown in FIG. 2.