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Pump piston assembly with acoustic dampening device

a technology of acoustic dampening device and piston assembly, which is applied in the direction of machines/engines, liquid fuel engines, and positive displacement liquid engines, etc., can solve the problems of generating squeaking noise between graphite and glass, noise can occur, and it is difficult to correct such tiny misalignments, so as to reduce or eliminate squeaking noise

Inactive Publication Date: 2013-04-04
TYCO HEALTHCARE GRP LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about a piston assembly that reduces or eliminates squeaking noise caused by acoustic resonance when the piston moves in the chamber or cylinder. It includes a liner sleeve that acts as an acoustic dampening device and absorbs or reduces the squeaking noises. The sleeve can be attached to the inner or outer surface of the piston by adhesive or press fit. The technical effect of this invention is to improve the performance of the piston assembly and reduce the noise generated during operation.

Problems solved by technology

This has been found to generate squeaking noise between the graphite and glass due to acoustic resonance resulting from any slight misalignment between the piston and cylinder.
This noise can occur even for tiny misalignments between the piston guide pin and the pump chamber or cylinder axis, and it is difficult to correct such tiny misalignments due to the number of components involved in such pump assemblies.
Such squeaking noises are a problem to users of home ventilators and the like, particularly under high humidity conditions when the squeaking is more prevalent.

Method used

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  • Pump piston assembly with acoustic dampening device
  • Pump piston assembly with acoustic dampening device
  • Pump piston assembly with acoustic dampening device

Examples

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Embodiment Construction

[0016]Certain embodiments as disclosed herein provide for a gas pump assembly of a medical ventilator or the like incorporating an acoustic dampening device to reduce or eliminate the squeaking noise of one or more pistons of the pump assembly sliding in its respective pump chamber or cylinder.

[0017]After reading this description it will become apparent to one skilled in the art how to implement the invention in various alternative embodiments and alternative applications. However, although various embodiments of the present invention will be described herein, it is understood that these embodiments are presented by way of example only, and not limitation. As such, this detailed description of various alternative embodiments should not be construed to limit the scope or breadth of the present invention as set forth in the appended claims.

[0018]FIG. 1 illustrates a first embodiment of a piston assembly 10 for a gas pump or the like incorporating an acoustic dampening device or liner ...

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Abstract

A pump piston assembly has a pump cylinder, at least one hollow piston slidably mounted for reciprocating motion in the pump cylinder, the piston having an inner surface of a first diameter and an outer surface of a second diameter, and a liner sleeve of a different material from the piston mounted on the inner or outer surface of the piston with a close or friction fit to the diameter of the piston surface on which it is mounted. The liner sleeve is of an acoustic dampening material which has a lower acoustic frequency than the piston material and is configured to absorb harmonic acoustic vibrations resulting from reciprocation of the piston in the cylinder.

Description

BACKGROUND[0001]1. Field of the Invention[0002]The invention relates generally to piston assemblies for gas pumps and the like having at least one piston reciprocating in a cylinder, and is particularly concerned with an acoustic dampening device for reducing any squeaking noise generated as the piston slides in the cylinder.[0003]2. Related Art[0004]Gas piston pumps are used in medical ventilators and other applications. In some ventilator pumps, a piston of a first material such as graphite reciprocates in a cylinder of a second material such as glass. This has been found to generate squeaking noise between the graphite and glass due to acoustic resonance resulting from any slight misalignment between the piston and cylinder. This noise can occur even for tiny misalignments between the piston guide pin and the pump chamber or cylinder axis, and it is difficult to correct such tiny misalignments due to the number of components involved in such pump assemblies. Such squeaking noises...

Claims

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Application Information

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IPC IPC(8): F04B53/16F04B19/22F04B19/04
CPCF04B53/001F04B53/14F04B53/143F05C2225/02F05C2203/0808F05C2225/00F04B53/166
Inventor CRAWFORD, JR., RICHARD WILLIAMPLATT, CLAYTON ROYZHENG, FAWNBEUCHAT, CHARLIE
Owner TYCO HEALTHCARE GRP LP
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