Filter device having a pump
First Claim
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1. A filter device, comprising:
- a filter housing;
a filter element exchangeably accommodated in said filter housing;
a fluid pump being in said filter housing and having first and second pump chambers;
a pump piston being movably guided longitudinally in said first and second pump chambers in two directions of travel and separating said first and second pump chambers from one another in a fluid tight manner when stationary and in at least one of the two directions; and
first and second valves being connected in fluid communication with said first and second pump chambers, respectively, and oppositely opening and closing upon actuation of said fluid pump, said first valve being in and part of said filter element and being movable between an open position providing fluid communication with and transfer of fluid to said first pump chamber from said filter element and a closed position blocking fluid communication with and transfer of fluid to said first pump chamber from said filter element.
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Accused Products
Abstract
A filter device usable with diesel fuels, includes a filter element (19) exchangeably accommodated in a filter housing. A fluid pump device (46) having two pump chambers (45, 49) is part of the filter device. The pump chambers, by a pump piston (51) guided in the chambers in a longitudinally movable manner, are separated from each other fluid-tight at least in one of the two directions of movement of the pump piston. Each pump chamber (45, 49) is assigned a valve (39, 63) opening or closing oppositely to the other valve (39, 63) when the pump device (46) is actuated.
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Citations
18 Claims
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1. A filter device, comprising:
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a filter housing; a filter element exchangeably accommodated in said filter housing; a fluid pump being in said filter housing and having first and second pump chambers; a pump piston being movably guided longitudinally in said first and second pump chambers in two directions of travel and separating said first and second pump chambers from one another in a fluid tight manner when stationary and in at least one of the two directions; and first and second valves being connected in fluid communication with said first and second pump chambers, respectively, and oppositely opening and closing upon actuation of said fluid pump, said first valve being in and part of said filter element and being movable between an open position providing fluid communication with and transfer of fluid to said first pump chamber from said filter element and a closed position blocking fluid communication with and transfer of fluid to said first pump chamber from said filter element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fuel supply system, comprising:
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a fluid circuit with an upstream pre-feed pump and a downstream main feed pump; and a filter device in said fluid circuit upstream of said pre-feed pump, said filter device including a filter housing; a filter element exchangeably accommodated in said filter housing; a fluid pump being in said filter housing and having first and second pump chambers; a pump piston being movably guided longitudinally in said first and second pump chambers in two directions of travel and separating said first and second pump chambers from one another in a fluid tight manner when stationary and in at least one of the two directions; and first and second valves being connected in fluid communication with said first and second pump chambers, respectively, and oppositely opening and closing upon actuation of said fluid pump, said first valve being in and part of said filter element and being movable between an open position providing fluid communication with and transfer of fluid to said first pump chamber from said filter element and a closed position blocking fluid communication with an transfer of fluid to said first pump chamber from said filter element. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification