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Pump diaphragm

a diaphragm and pump technology, applied in the direction of positive displacement liquid engines, engine components, machines/engines, etc., can solve the problems of pump failure, pump action, pump failure, etc., to achieve the effect of reducing the size of the diaphragm

Inactive Publication Date: 2009-02-26
GRIFFITHS JOSEPH ANTHONY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a diaphragm for use in a fluid pump that has a curved shape with a plurality of steps. The diaphragm is made of a resilient material, such as rubber or PTFE, and may have a chemically resistant coating on at least one side. The diaphragm is designed to withstand high pressure and can be used in hydraulic pressure type pumps. The technical effects of this invention include improved pump efficiency, reduced noise, and improved durability."

Problems solved by technology

In both pump types, the repeated flexing of the pump diaphragm causes fluid displacement in a pumping chamber which results in the pumping action.
However, if the pump is intended for use with fluids having a more chemically reactive nature, an elastomeric diaphragm, such a natural rubber, alone is unsuitable as it is rapidly corroded, leading quickly to pump failure.
However, the materials which would be most desirable to use for such a protective layer due to their excellent chemical resistance properties, such at PTFE, have plastic material properties, meaning they are unable to stretch and recover their original shape.
However, when conventional pump diaphragms are in use, the repeated flexing between convex and concave positions causes the rubber of the diaphragm to repeatedly stretch and deform.
Therefore, if a conventional diaphragm is coated with a protective layer, such as PTFE, it results in the protective coating cracking and splitting when the pump is in use, since the protective layer cannot cope with the repeated elastic deformation which the diaphragm experiences.

Method used

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Embodiment Construction

[0021]An example of a known diaphragm pump 10 is shown schematically in FIG. 1 and comprises a chamber 11, through which fluid being pumped flows, having an inlet 12 and an outlet 13. The inlet 12 includes a one-way valve 14 which allows fluid to flow into the chamber 11 though the inlet 12 but not out of the chamber 11 therethrough, and the outlet 13 includes a one-way valve 15 which allows fluid to flow out of the chamber 11 through the outlet 13 but not into the chamber 11 therethrough. A flexible diaphragm 16 is mounted in the wall of the chamber 11 separating the chamber 11 from a cavity 17. The diaphragm 16 is connected at its centre to a piston 18 of a pump driver 19. The piston 18 is driven backwards and forward in the direction shown by arrow ‘A’ to cause the diaphragm 16 to deform between position I in FIG. 1 where it extends into the cavity 17, and position II in FIG. 1, where it extends into the chamber 11. As discussed above, the prior art pump described here is of the ...

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Abstract

A diaphragm for use in a fluid pump comprising a disc of resilient material having a substantially dished shape. The curvature of the disc is formed from a plurality of steps.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application claims the benefit of and priority to Great Britain (GB) Application Serial No. 0716294.4, filed on Aug. 21, 2007, the entire content of which is incorporated herein by reference.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to a diaphragm for use in a fluid pump, and more particularly, to a diaphragm configured to be coated with a protective layer such that the protective layer would avoid fracturing in use.[0004]2. Background of Related Art[0005]Diaphragm-type fluid pumps and, in particular liquid pumps, have a flexible pumping diaphragm which is driven to effect the pumping action of the pump. In such pumps, the diaphragm comprises a flexible circular or oval disc which has its outer peripheral edge clamped and sealed within the body of the pump. The diaphragm may have a central aperture which is secured to a moveable actuator such as a piston, which reciprocates back and forth causing the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B17/00
CPCF05C2225/04F04B43/0054F04B43/02
Inventor GRIFFITHS, JOSEPH ANTHONY
Owner GRIFFITHS JOSEPH ANTHONY