Fluid purification methods, devices, and systems
AssigneeNxStage Medical, Inc.
InventorsJoseph E. Turk, Jr., William K. Weigel, Goetz Friederichs, Jeffery B. Hover
Life of this patent
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Abstract
A fluid purification system has cells whose purifying capability can be regenerated. Some of the cells are arranged in series to reach a high level of purification. An automatic valve network is controlled to cycle the cells in a way that levels the loads on each, thereby maximizing the service interval for replacing expired cells, enabling all of the cells to be replaced at the same time after having each contributing approximately equally to the purification load, and operated such that at any one time, at least one cell is regenerated so as to enable continuous up-time.
Claims20
A system for purifying water, comprising:
- a fluid circuit with at least one source water port, at least one product water port, fluid channels, automatic valves (AVs), electronic deionization cell modules (EDCs), and a controller connected to control the AVs and the EDCs, each AV having an inlet and an outlet;
- the controller being configured to operate the AVs to define selected flow paths to carry water through the EDCs in a series corresponding to respective selected flow paths whereby the EDCs have ranks from 0 to N, an EDC having a lowest rank in the series (0) receives water from the source water port, the EDC ranks increase along the series, and an EDC having a highest rank in the series (N) supplies water to the product water port;
- the controller being configured to operate the AVs periodically to define the selected flow paths to flow a first portion of water from the rank N−1 EDC to the product water port and to flow a second portion of water from the rank N−1 EDC to the rank N EDC in a reverse direction to regenerate the rank N EDC, and
- the controller further being configured to perform a rotation operation that operates the AVs such that a previous rank 0 EDC is assigned to rank N and is thereby regenerated, and each remaining EDC is assigned to a decremented rank, respectively.
A system for purifying water, comprising:
- a fluid circuit with a source water port and a product water port with the source water port being connected to a supply of potable water and the product water port being connected to a purified water-consuming device;
- the fluid circuit having fluid channels, automatic valves (AVs), electronic deionization cell modules (EDCs), and a controller connected to control the AVs and the EDCs, each AV having an inlet and an outlet;
- the controller being configured to operate the AVs to define selected flow paths to carry water through the EDCs in a series corresponding to respective selected flow paths whereby the EDCs have ranks from 0 to N, an EDC having a lowest rank in the series (0) receives water from the source water port, the EDC ranks increase along the series, and an EDC having a highest rank in the series (N) supplies water to the product water port;
- the controller being configured to operate the AVs periodically to define the selected flow paths to flow a first portion of water from the rank N−1 EDC to the product water port and to flow a second portion of water from the rank N−1 EDC to the rank N EDC in a reverse direction to regenerate the rank N EDC, and
- the controller further being configured to perform a rotation operation that operates the AVs such that a previous rank 0 EDC is assigned to rank N and is thereby regenerated, and each remaining EDC is assigned to a decremented rank, respectively;
- wherein the controller is configured to repeat the rotation operation, the repeated rotation operation being such that water is purified and provided to a product water outlet continuously and one or more EDCs are regenerated continuously.
Dependencies are inferred from the claim text.