Pressure actuated diaphragm pump
OwnerYushi Maruyama, Toshimitsu Kuzuoka +1inventors
InventorsYushi Maruyama, Toshimitsu Kuzuoka, Toshihisa Nemoto
Life of this patent
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Abstract
A diaphragm pump includes a discharge chamber, a diaphragm configured to be actuated by a pulsation pressure, a fuel flow path fluidly coupled with the discharge chamber, and a fuel chamber located on the fuel flow path. The diaphragm includes a diaphragm actuating portion forming a part of the discharge chamber, and configured to suction fuel into the discharge chamber and to discharge the fuel from the discharge chamber in response to being actuated by the pulsation pressure, and a valve actuating portion located in the fuel chamber and configured to selectively open and close the fuel flow path.
Claims20
A diaphragm pump actuated by pulsation pressure received in a crank chamber of an engine, the diaphragm pump comprising:
- a supply-side fuel chamber;
- a discharge chamber;
- a diaphragm having:
- a supply-side valve actuating portion configured to allow fuel to flow from the supply-side fuel chamber to the discharge chamber while preventing the fuel from flowing from the discharge chamber to the supply-side fuel chamber;
- and
- a diaphragm actuating portion actuated by the pulsation pressure and configured to suction the fuel into the discharge chamber and to discharge the fuel from the discharge chamber;
- a supply path configured to supply the fuel from the supply-side fuel chamber to the discharge chamber;
- and
- a supply valve configured to restrict the flow direction of the fuel in the supply path,
- wherein the supply-side fuel chamber includes a supply inlet through which the fuel flows into the supply-side fuel chamber,
- wherein the supply valve includes:
- the supply-side valve actuating portion of the diaphragm located adjacent to the supply inlet and configured to selectively open and close the supply inlet;
- and
- a supply-side biasing member located in the supply-side fuel chamber and contacting the supply-side valve actuating portion, the supply-side biasing member configured to bias the supply-side valve actuating portion.
A diaphragm pump comprising:
- a discharge chamber;
- a fuel chamber;
- a low-pressure-side diaphragm configured to be actuated by a pulsation pressure;
- a high-pressure-side diaphragm located adjacent to the discharge chamber;
- a coupling device connecting the low-pressure-side diaphragm to the high-pressure-side diaphragm, so that, in response to the pulsation pressure, the high-pressure-side diaphragm is configured to be actuated in conjunction with the low-pressure-side diaphragm;
- and
- a fuel flow path fluidly coupled between the discharge chamber and the fuel chamber,
- wherein the high-pressure-side diaphragm includes:
- a diaphragm actuating portion configured to suction fuel into the discharge chamber and to discharge the fuel from the discharge chamber in response to being actuated by the pulsation pressure;
- and
- a valve actuating portion located adjacent to the fuel chamber and configured to selectively open and close the fuel flow path.
Dependencies are inferred from the claim text.