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

A positive displacement pump and end plate technology, applied in the components of the pumping device for elastic fluid, rotary piston type/swing piston type pump components, pump components, etc., can solve the inefficiency of positive displacement air pump , air leaks, etc.

Inactive Publication Date: 2017-12-01
EATON INTELLIGENT POWER LTD
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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 and a cause of inefficiency in positive displacement air pumps

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

The present invention relates to a positive displacement pump assembly comprising a rotor housing defining a rotor cavity and an end plate configured to at least partially close one end of the rotor cavity. The rotor is supported and fixed on a rotor shaft extending through the rotor cavity. The first pair of bearings secures the rotor shaft to the end plate. A second pair of bearings shafts the rotor to a stationary rotor housing, preventing relative axial movement between the rotor shaft and the rotor housing. When the axial length of the rotor shaft changes due to thermal fluctuations, the end plate moves axially together with the rotor shaft, thereby reducing the change in the axial clearance at the end face of the rotor.

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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Patent Type & Authority Patents(China)
IPC IPC(8): F04C18/12F04C29/00
CPCF04C27/006F01C21/108F04C18/16F04C29/005F04C2240/52F04C2270/17
Inventor D·R·奥文加B·T·史密斯
Owner EATON INTELLIGENT POWER LTD
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