Positive displacement pump assembly with movable end plate for rotor face clearance control

A positive displacement pump and component technology, applied in the field of positive displacement pump components, can solve problems such as air leakage and inefficiency of positive displacement air pumps

Inactive Publication Date: 2013-10-30
EATON INTELLIGENT POWER LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Air leakage around the rotor face is an undesired path ...

Method used

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  • Positive displacement pump assembly with movable end plate for rotor face clearance control
  • Positive displacement pump assembly with movable end plate for rotor face clearance control
  • Positive displacement pump assembly with movable end plate for rotor face clearance control

Examples

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Embodiment Construction

[0014] Referring to the drawings, wherein like reference numerals indicate like components throughout the views, figure 1 A positive displacement pump assembly 10 is shown. In this embodiment, the positive displacement pump assembly 10 is a supercharger assembly for an engine, but the positive displacement pump assembly 10 may be used for pumping other fluids and in other applications. The positive displacement pump assembly 10 has a first rotor 12 meshing with a second rotor 14 . Each rotor 12, 14 has a plurality of lobes. The first rotor 12 is mounted on and rotates with the first rotor shaft 16 . The second rotor 14 is mounted on and rotates with a second rotor shaft 18 , which is generally parallel to the first rotor shaft 16 .

[0015] The rotors 12 , 14 and rotor shafts 16 , 18 are housed within a multi-component positive displacement pump housing 20 . The housing 20 includes a front cover 22 , a middle portion 24 , which may be referred to as a rotor housing portion...

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PUM

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Abstract

A positive displacement pump assembly includes a rotor housing defining a rotor cavity, and an end plate configured to at least partially close one end of the rotor cavity. Rotors are supported on and fixed to rotor shafts and extend through the rotor cavity. A first pair of bearings fixing the rotor shafts to the end plate. A second pair of bearings fixes the rotor shafts to the rotor housing, preventing relative axial movement between the rotor shafts and the rotor housing. The end plate is axially movable with the rotor shafts when the rotor shafts vary in axial length due to thermal fluctuations so that changes in an axial clearance at end faces of the rotors are reduced.

Description

technical field [0001] The present invention generally relates to a positive displacement pump assembly, such as a supercharger assembly for an engine. Background technique [0002] Positive displacement pumps can be used to increase fluid pressure under certain operating conditions. A supercharger is a positive displacement pump used to increase the air pressure at the engine intake. Positive displacement air pumps typically have a multi-lobed rotor meshed in a rotor housing. Air moves from the inlet to the outlet, and the gap between the rotor and the rotor housing is designed to prevent air from flowing in undesired paths. Air leakage around the rotor face is an undesirable path and a cause of inefficiency in positive displacement air pumps. [0003] The rotor is mounted on the rotor shaft. The rotor and rotor shaft tend to expand or contract due to thermal fluctuations. The rotor housing also tends to expand or contract, and can expand or contract at a different rat...

Claims

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Application Information

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IPC IPC(8): F04C18/12F04C29/00
CPCF04C18/16F04C27/006F01C21/108F04C29/005F04C2240/52F04C2270/17
Inventor D·R·奥文加B·T·史密斯
Owner EATON INTELLIGENT POWER LIMITED
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