Positive displacement micropump

• US 5,338,164 A
• Filed: 05/28/1993
• Issued: 08/16/1994
• Est. Priority Date: 05/28/1993
• Status: Expired due to Term

• Current Assignee: Pratt & Whitney Rocketdyne Incorporated (L3Harris Technologies, Inc.)
• Original Assignee: Rockwell International Corporation
• Inventors: Tabibzadeh, Ramin, Sutton, Robert F., Lang, Ko-Wei
• Primary Examiner(s): Bertsch, Richard A.
• Assistant Examiner(s): KORYTNYK, PETER G
• Application Number:
  US08/068,049
• Time in Patent Office: 445 Days
• Field of Search: 417/413 A, 417/412, 417/410, 417/395, 417/474-479
• US Class Current: 417/413.2
• CPC Class Codes: F04B 43/046 with piezoelectric drive

Abstract

This invention is for a pump having a series of chambers in a stack wherein electrodeformable material is used to deform a diaphragm to change the volume in the chambers. The architecture of the pump features stacks of chambers having a common diaphragm between adjacent chambers such that when a diaphragm is deformed to increase the volume in one chamber it simultaneously decreases the volume in the adjoining chamber. In one embodiment the stacks of chambers can be combined with other stacks to increase the head pressure in stages. In a second embodiment the stages can be in the same stack.

Claims

1. A pump comprising,

a plurality of chambers each having a top disc diaphragm, a bottom disc diaphragm and a side wall,

an inlet and an outlet for fluid flow to and from each chamber, passing through the side wall,

a valve attached to the inlet and a valve connected to the outlet to control the direction of fluid flow,

the plurality of chambers stacked such that the disc top diaphragm of one chamber is also the bottom disc diaphragm of the adjacent chamber,

each disc diaphragm having an electrodeformable material for deforming the disc diaphragm and changing the volume of the chamber when activated,

a means of activating the electrodeformable material so that the top and bottom disc diaphragms in each chamber move toward each other or away from each other simultaneously,

the outlet of one chamber is connected to the inlet of another chamber for increasing the pressure of the fluid in stages.

2. A pump as in claim 1 wherein,

the outlet of one chamber is connected to the inlet of another chamber in the same stack for increasing the pressure of a fluid in stages.

3. A pump as in claim 1 wherein,

the outlet of one chamber is connected to the inlet of another chamber in a different stack for increasing the pressure of a fluid in stages.

4. A pump as in claim 2 wherein,

the chamber size varies corresponding to the chamber stage in the pump.

5. A pump as in claim 3 wherein,

the chamber size varies corresponding to the chamber stage in the pump.

6. A pump as in claim 1 wherein the top chamber is bounded by the top of the housing and a disc diaphragm and the bottom chamber is bounded by the bottom of the housing and a disc diaphragm.

7. A pump as in claim 1 wherein the top chamber has an inlet and outlet through the top of the housing and the bottom chamber has an inlet and outlet through the bottom of the housing.