Patent EP0310254A2 successfully refreshed from Google Patents.
EP0310254A2
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EP
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Reciprocating pump unit
Assignee: Framo Developments UK Ltd
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Filing: 1988-09-05
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Granted: —
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Expires: 2008-09-05
Abstract
Abstract Pump units with reciprocably movable pistons driven by linear electric motors move substantially equal volumes of fluid on each stroke. Two pistons (10,11) can be moved alternately towards and away from each other, or a piston assembly comprising a piston (60;85) is reciprocated in a cylinder (61;82) together with a discharge tube (56;99) extending from the piston into a discharge duct (75;102).
Inventors
- 👤 Frank Mohn
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 05:55
CPC Classifications
F; F04; F04B; F04B17/00; F04B17/03; F04B17/04; F04B17/046; E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/128; F04B3/00; F04B53/00; F04B53/10; F04B53/12; F04B53/125; F04B53/126
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
81 words
A pump unit comprising a pump casing (5,6;61,62;82) having a variable volume pump space therein, non-return valves (16;66,67;97,101) permitting movement of a fluid to be pumped from an inlet space through the pump space to a discharge space, and drive means (20,21;54;90,91) for driving piston means (10,11;60;85) in the casing through reciprocating movements to increase and decrease the pump space alternately, the piston means being arranged to move said fluid into the discharge space on each movement of the piston means.
Claim 2
Dependent Claim
81 words
A pump unit comprising a pump casing (5,6;61,62;82) having a variable volume pump space therein, non-return valves (16;66,67;97,101) permitting movement of a fluid to be pumped from an inlet space through the pump space to a discharge space, and drive means (20,21;54;90,91) for driving piston means (10,11;60;85) in the casing through reciprocating movements to increase and decrease the pump space alternately, the piston means being arranged to move said fluid into the discharge space on each movement of the piston means.
Claim 3
Dependent Claim
31 words
A pump unit as claimed in claim 1 wherein the piston means move substantially equal volumes of the fluid into the discharge space on each of movement of the piston means.
Claim 4
Dependent Claim
42 words
A pump unit as claimed in claim 1 or 2 wherein the piston means comprises upstream and downstream pistons (10,11) defining the pump space between them, the drive means being arranged to drive the pistons alternately towards and away from each other.
Claim 5
Dependent Claim
29 words
A pump unit as claimed in claim 3 wherein the non-return valve means comprise at least one non-return valve (16) controlling fluid flow through each of the pistons (10,11).
Claim 6
Dependent Claim
30 words
A pump unit as claimed in claim 3 or 4 wherein the drive means comprises upstream and downstream linear electric motors (20,21) acting on the upstream and downstream pistons respectively.
Claim 7
Dependent Claim
92 words
A pump unit as claimed in claim 1 or 2 wherein the casing means comprises a cylinder (61,62;82), the piston means comprises a piston (60;85) slidably guided in the cylinder and a discharge tube (56;99) extending from the piston outwardly of the cylinder into the discharge space (75;105), and the non-return valve means comprise at least one first non-return valve (66;97) controlling fluid communication between the inlet space and the pump space and at least one second non-return valve (67;101 ) controlling fluid communication between the pump space and the discharge tube.
Claim 8
Dependent Claim
21 words
A pump unit as claimed in claim 6 wherein the drive means is located between the cylinder and the discharge space.
Claim 9
Dependent Claim
28 words
A pump unit as claimed in claim 6 or 7 wherein the interior (70) of the cylinder other than the pump space freely communicates with the inlet space.
Claim 10
Dependent Claim
42 words
A pump unit as claimed in claim 7 or 8 wherein the first non-return valve (64) is located in the wall of the cylinder and the second non-return valve (67) is located at the junction of the piston and the discharge tube.
Claim 11
Dependent Claim
55 words
A pump unit as claimed in claim 6 wherein the cylinder (82) comprises an end portion of an inlet duct (81), the piston divides the interior of the cylinder into the inlet space (95) and the pump space (94), and the discharge space is defined by an outlet duct (102) received within the inlet duct.
Claim 12
Dependent Claim
53 words
A pump unit as claimed in claim 10 wherein the cylinder has an apertured end wall (86) defining the end of the inlet duct, and the piston has a drive shaft (87) extending therefrom remotely from the discharge tube and through the apertured end wall to receive a drive from the drive means.
Claim 13
Dependent Claim
32 words
A pump unit as claimed in claim 10 or 11 wherein the inlet duct has an extension portion (84) beyond the cylinder and the drive means is accommodated in the extension portion.
Claim 14
Dependent Claim
46 words
A pump unit as claimed in claim 10, 11 or 12 wherein the at least one first non-return valve (97) is located in the piston and the second at least one non-return valve (101) is located at the junction of the piston and the discharge tube.
Claim 15
Dependent Claim
22 words
A pump unit as claimed in any one of claims 1-4 and 6-13 wherein the drive means comprises linear electric motor means.
References Cited (Backward Citations)
No citation records indexed.
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