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Pump for conveying a highly viscous fluid

Inactive Publication Date: 2017-04-20
SULZER MANAGEMENT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention proposes a design for a pump that increases efficiency when pumping viscous fluids by reducing power losses and back flow rate. By making the gap between the front shroud of the impeller and the stationary impeller opening shorter than in prior art, the efficiency is improved while the risk of back flow is reduced. Additionally, it is advantageous to have a radial clearance between the second front shroud and the second impeller opening of at most 0.0045 times the diameter of the second impeller opening. These technical features contribute to the overall pump efficiency and make the pump more efficient in delivering viscous fluids.

Problems solved by technology

On the other hand one may expect that the shortening of the gap would result in a reduced sealing action thus increasing the back flow in the pump.
However an increase in the back flow rate reduces the pump efficiency and thus contravenes an improved efficiency.

Method used

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  • Pump for conveying a highly viscous fluid
  • Pump for conveying a highly viscous fluid
  • Pump for conveying a highly viscous fluid

Examples

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Embodiment Construction

[0039]FIG. 1 shows a cross-sectional view of an embodiment of a pump according to the invention which is designated in its entity with reference numeral 1. FIG. 2 shows an enlarged representation of detail I in FIG. 1. The pump 1 is designed for conveying a highly viscous fluid, whereas the term “highly viscous” has the meaning that the kinematic viscosity of the fluid is at least 10−4 m2 / s, which is 100 centistokes (cSt).

[0040]In this embodiment the pump 1 is designed as a double suction single stage centrifugal pump. This design is one preferred embodiment which is in practice useful for many applications. Of course, the invention in not restricted to this design. A pump according to the invention may also be designed as a single suction centrifugal pump or as a multistage centrifugal pump or as any other type of centrifugal pump. Based upon the description of the embodiment shown in FIG. 1 and FIG. 2 it is no problem for the skilled person to build a pump according to the inventi...

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PUM

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Abstract

A pump for conveying a highly viscous fluid includes a casing with at least a first inlet and an outlet for the fluid, an impeller for conveying the fluid from the inlet to the outlet. The impeller is arranged on a rotatable shaft for rotation around an axial direction, and includes a front shroud facing the first inlet of the pump. The casing includes a stationary impeller opening for receiving the front shroud of the impeller and having a diameter. The front shroud and the stationary impeller opening form a gap having a length in the axial direction, the ratio of the length of the gap and the diameter of the impeller opening is at most 0.092.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit to European Application No. 15189840.0, filed Oct. 14, 2015, the contents of which is hereby incorporated herein by reference.BACKGROUND[0002]Field of the Invention[0003]The invention relates to a pump for conveying a highly viscous fluid.[0004]Background of the Invention[0005]Pumps for pumping highly viscous fluids are used in many different industries, for example in the oil and gas processing industry for conveying hydrocarbon fluids. Here, these pumps are used for different applications such as extracting the crude oil from the oil field, transportation of the oil or other hydrocarbon fluids through pipelines or within refineries. But also in other industries for example the food industry or the chemical industry there is often the need for conveying highly viscous fluids.[0006]The viscosity of a fluid is a measure for the internal friction generated in a flowing fluid and a characteristic property of t...

Claims

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Application Information

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IPC IPC(8): F04D29/16F04D29/42F04D29/22F04D7/04F04D1/00
CPCF04D29/167F04D7/04F04D29/4293F04D29/2294F04D1/006F04D29/086F04D29/4273F04D29/2266F04D29/026
Inventor LIGHTHEART, BARRY
Owner SULZER MANAGEMENT AG