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US3861830A Expired / Lapsed US ⏱️ 0.0 years remaining

Pressure differential pumping system for dry bulk products

Assignee: Individual
•
Filing: 1973-09-17
•
Granted: 1975-01-21
•
Expires: 1993-09-17
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Abstract

Abstract A pressure differential pumping system for dry bulk products draws a supply of products into a vessel during the suction cycle of the system and then forces the supply out of the vessel into a pneumatic conveying line during the discharge cycle so as to completely transfer a load of products from one location to another during repeated cycles. A control valve assembly adjacent the vessel and in communication therewith alternately draws a vacuum on the vessel and produces a positive pressure air discharge thereinto during the cycles of operation. The special valve assembly includes a venturi through which a primary airstream is continuously directed so that a secondary airstream may be produced during the suction cycle of the system when a reciprocating valve member is at one end of its path of travel. When the member is at the opposite end of its path of travel, the secondary airstream is terminated and the positive pressure discharge cycle is begun. The stroke of the reciprocating valve member can be varied so that a modulating airstream, in addition to the primary airstream, may pass through the venturi during the discharge cycle in order to dilute the conveying line with additional air and thus avoid product jamming. A particle separator coupled with the system between the valve assembly and the vessel removes abrasive particles from the secondary airstream during the suction cycle and projects the collected particles directly into the conveying line during the discharge cycle.

Inventors

  • 👤 Ronald D Johnson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 12:07
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/02; B; B65; B65G; B65G53/00; B65G53/04; B65G53/28

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 161 words
In a pressure-differential pumping system for dry bulk products, a control valve assembly including: means defining a valve chamber; inlet means for introducing pressurized air into said chamber; outlet means for withdrawing air from said chamber; port means between said inlet and outlet means in communication with said chamber; venturi structure communicating with said outlet means; means for forcing a primary stream of air through said chamber to create a secondary airstream flowing from said port through said outlet means and merging with said primary stream; and a valve member reciprocable within said chamber for alternately causing suction intake and positive discharge through said port means, said member being reciprocable between a first position closing said inlet means to cause said suction intake as a result of the induced secondary airstream through said outlet means, and a second position opening said inlet means to cause said positive discharge as a result of airflow from said inlet means through said port means.
Claim 2
Dependent Claim 161 words
In a pressure-differential pumping system for dry bulk products, a control valve assembly including: means defining a valve chamber; inlet means for introducing pressurized air into said chamber; outlet means for withdrawing air from said chamber; port means between said inlet and outlet means in communication with said chamber; venturi structure communicating with said outlet means; means for forcing a primary stream of air through said chamber to create a secondary airstream flowing from said port through said outlet means and merging with said primary stream; and a valve member reciprocable within said chamber for alternately causing suction intake and positive discharge through said port means, said member being reciprocable between a first position closing said inlet means to cause said suction intake as a result of the induced secondary airstream through said outlet means, and a second position opening said inlet means to cause said positive discharge as a result of airflow from said inlet means through said port means.
Claim 3
Dependent Claim 27 words
A control valve assembly as claimed in claim 1, wherein said outlet means includes an air jet having one end thereof projecting into said structure axially thereof.
Claim 4
Dependent Claim 40 words
A control valve assembly as claimed in claim 2, wherein the opposite end of said jet is provided with a valve seat for said member for closing the jet to said port means when the member is against said seat.
Claim 5
Dependent Claim 37 words
A control valve assembly as claimed in claim 3, wherein said inlet means includes a second seat for said member for closing said port means to said inlet means when the member is against said second seat.
Claim 6
Dependent Claim 44 words
A control valve assembly as claimed in claim 3, wherein said means for forcing a primary airstream through said structure includes an intake manifold surrounding said structure and said jet for forcing said primary stream into the structure between the latter and said jet.
Claim 7
Dependent Claim 25 words
A control valve assembly as claimed in claim 3, wherein said jet, said venturi structure, and the path of reciprocation of said member are coaxial.
Claim 8
Dependent Claim 44 words
A control valve assembly as claimed in claim 1, wherein said assembly further includes apparatus for varying said second position of the member with respect to said outlet means to permit modulation of airflow through said outlet means when said inlet means is open.
Claim 9
Dependent Claim 42 words
A control valve assembly as claimed in claim 7, wherein said member includes an elongated stem, said apparatus including a device movable with said stem but selectively shiftable therealong and stationary abutment means disposed in the path of travel of said device.
Claim 10
Dependent Claim 38 words
A control valve assembly as claimed in claim 7, wherein said outlet means includes an air jet having one end thereof projecting into said structure and the opposite end thereof provided with a valve seat for said member.

References Cited (Backward Citations)

US2616766A Cited
US3372958A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-01-20 1978-07-22 1979-01-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-01-20 1982-07-22 1983-01-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-01-20 1986-07-22 1987-01-21 $7700.00 Window Closed / Lapsed

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