Multi-channel pump and its control method
a multi-channel pump and control method technology, applied in the direction of machines/engines, liquid fuel engines, positive displacement liquid engines, etc., can solve the problems of low methanol oxidation, voltage loss, voltage loss in the cathode electrode, etc., to achieve accurate discharging of fluid an appropriate amoun
Inactive Publication Date: 2006-01-19
SANKYO SEIKI MFG CO LTD
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Benefits of technology
[0010] In view of the problems descried above, the present invention may advantageously provide a multi-channel pump which is provided with a plurality of outflow passages for discharging fluid and capable of accurately discharging an appropriate amount of fluid and provide a control method for the multi-channel pump.
[0011] Further, the present invention may advantageously provide a multi-channel pump which is capable of being mounted in a small-sized DMFC or the like that is used in a portable electronic device or the like.
Problems solved by technology
The activity of methanol oxidation is low in the anode electrode of the cell which is the power generating part of an above-mentioned DMFC and thus a voltage loss occurs.
Therefore, an output capable of being obtained from one cell becomes extremely low.
When methanol is excessively supplied to the anode electrode, a so-called crossover occurs which means that a part of the methanol transmits through the electrolyte membrane in an unreacted state and leaks to the cathode electrode.
Further, unreacted methanol that is reaches the cathode electrode is not related to power generation but reacts with oxygen to generate heat, and thus the power-generating efficiency in the cell is significantly reduced by the crossover.
However, the liquid feed pump having such characteristics has not been proposed.
Method used
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Embodiment Construction
[0041] An embodiment of the present invention will be described below with reference to the accompanying drawings.
[0042]FIG. 1 is a schematic view showing a basic structure of a multi-channel pump in accordance with an embodiment of the present invention.
[0043] A multi-channel pump 1 (pump 1) in accordance with an embodiment of the present invention is used as a liquid feed pump for feeding methanol forcibly in a DMFC used, for example, in a portable electronic device. The multi-channel pump 1 includes a pump chamber 2, inflow passages 3 connected to the pump chamber 2, two or more outflow passages 4 connected to the pump chamber 2 through outflow side active valves 6, and a movable body 13 which is reciprocated to change the volumetric capacity of the pump chamber 2. More concretely, two inflow passages 3a, 3b are connected to a pump chamber 2 and eight outflow passages 4a through 4h are connected to the pump chamber 2 through eight outflow side active valves 6a through 6h.
[0044...
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A multi-channel pump includes a pump chamber, an inflow passage connected to the pump chamber, two or more outflow passages connected to the pump chamber, outflow side active valves provided so as to correspond to the outflow passages, and a movable body reciprocated to change a volumetric capacity of the pump chamber. The movable body may be a piston reciprocated within a cylinder that is connected to the pump chamber. A control method for a multi-channel pump includes an initial discharge step between a suction step and a discharge step.
Description
CROSS REFERENCE TO RELATED APPLICATION [0001] The present invention claims priority under 35 U.S.C. §119 to Japanese Application No. 2004-208551 filed Jul. 15, 2004, which is incorporated herein by reference. FIELD OF THE INVENTION [0002] The present invention relates to a multi-channel pump which is used in a direct methanol type fuel cell or the like and a control method for the multi-channel pump. [0003] In the present specification, the “multi-channel pump” means a pump which is provided with a plurality of outflow passages for discharging fluid. BACKGROUND OF THE INVENTION [0004] Expectation for a fuel cell has been elevated as a power supply for a portable electronic device used in information society in recent years or as a power supply for coping with air pollution or global warning. Among the fuel cells, a direct methanol type fuel cell hereinafter, referred to as DMFC: Direct Methanol Fuel Cell) in which power generation is performed by directly taking out protons from met...
Claims
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IPC IPC(8): F04B41/00F04B49/00
CPCF04B53/16H01M8/04186H01M8/1011Y02B90/18Y02E60/523Y02E60/50H01M2250/30Y02B90/10
Inventor YOKOZAWA, MITSUOMURAMATSU, KENJI
Owner SANKYO SEIKI MFG CO LTD