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Variable Stroke Length Electrically Operated Diaphragm Pump

a diaphragm pump and variable stroke technology, applied in the direction of pump control, positive displacement liquid engine, piston pump, etc., can solve the problems of inability to meet the needs of compressed air, etc., to achieve efficient energy conversion, eliminate the need for compressed air, and high speed

Inactive Publication Date: 2014-09-18
TUTHILL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a new type of pump called a variable stroke length EOD pump. This pump uses a special type of electromagnet to convert electrical energy into mechanical energy, eliminating the need for a gear train that is typical of conventional EOD pumps. This design reduces the size, weight, cost, and complexity of EOD pumps while also allowing for higher outlet restrictions. The new pump has a significantly larger force-to-volume ratio compared to conventional EOD pumps, which makes it more efficient and effective.

Problems solved by technology

AOD pumps, nevertheless, also possess an inherent limitation—they require compressed air as a power source.
Compressed air may not always be available in places where an AOD pump could be useful.
Obtaining this power source requires an additional expense which may limit the pump's potential market.
Compressed air power also lacks efficiency.
On the other hand, using gear motors in EODs adds considerable size, weight, and expense to the pump when compared to an AOD.
Commercially available gearmotor EOD's also typically have bypass springs that simply collapse when high outlet pressure places too much force against the diaphragms.
This technique protects overloading the gearmotor, but does nothing to allow the pump to operate into higher outlet restrictions.

Method used

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  • Variable Stroke Length Electrically Operated Diaphragm Pump
  • Variable Stroke Length Electrically Operated Diaphragm Pump
  • Variable Stroke Length Electrically Operated Diaphragm Pump

Examples

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Embodiment Construction

[0026]The present disclosure provides a variable stroke length EOD pump such as shown in FIG. 1. An illustrative embodiment includes a directly coupled EOD pump that employs axial air gaps 4 between its armature 6 and stators 14 so that no mechanical gear reduction is required to drive its diaphragms 10. The air gap distance is varied to assure that adequate axial force is attainable for the applied outlet restrictions. In an illustrative embodiment, a compression spring drive mechanism 12 allows relative motion between the EOD's armature 6 and pump diaphragms 10. The spring arrangement allows the magnetic air gap 4 to vary in response to the pump's outlet pressure so that high flow rates can be delivered into low restriction, and low flow rates can be delivered into high restrictions to replicate the operational performance of commercially available air operated diaphragm pumps. Movement of the EOD's armature 6 is controlled by a closed-loop PI controller monitoring the EOD's drive...

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Abstract

A variable stroke length EOD pump system is provided that includes a diaphragm pump and an electromagnetic linear actuator that operates the diaphragm pump. The linear actuator includes two stator halves, and an armature. The armature is supported for linear motion along an axis of and between field poles of the stator halves. Each stator half may also include a drive coil partially surrounded by a magnetically permeable core.

Description

RELATED APPLICATIONS[0001]The present application is related to and claims priority to U.S. Provisional Patent Application, Ser. No. 61 / 781,335, filed on Mar. 14, 2013, entitled “Variable Stroke Length Electrically Operated Diaphragm Pump.” The subject matter disclosed in that provisional application is hereby expressly incorporated into the present application in its entirety.TECHNICAL FIELD[0002]The present disclosure is related to diaphragm pumps and, more particularly, to an electrically operated diaphragm pump having a reciprocating electromagnetic linear actuator.BACKGROUND AND SUMMARY[0003]Commercially available air operated diaphragm (AOD) pumps possess many desirable features. AOD pumps, nevertheless, also possess an inherent limitation—they require compressed air as a power source. Compressed air may not always be available in places where an AOD pump could be useful. Obtaining this power source requires an additional expense which may limit the pump's potential market.[00...

Claims

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Application Information

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IPC IPC(8): F04B35/04
CPCF04B35/04F04B49/12F04B17/04F04B43/04F04B35/045
Inventor ASHE, LESTER B.
Owner TUTHILL CORP