Pressure actuated diaphragm pump
AssigneeMaruyama Mfg. Co., Inc.
InventorsYushi MARUYAMA, Toshimitsu KUZUOKA, Toshihisa NEMOTO
Life of this patent
Estimating the term…
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 receiving a pulsation pressure in a crank chamber of an engine, the diaphragm pump comprising:
- a discharge chamber;
- a diaphragm having a diaphragm actuating portion actuated by the pulsation pressure and configured to suction fuel into the discharge chamber and to discharge the fuel from the discharge chamber;
- a supply path configured to supply the fuel to the discharge chamber;
- a supply valve provided in the supply path and configured to restrict a directional flow of the fuel in the supply path;
- and
- a supply-side fuel chamber provided in a middle portion of the supply path,
- wherein the supply path includes a supply inlet through which the fuel flows into the supply-side fuel chamber,
- wherein the supply valve includes:
- a supply-side valve body located in the supply-side fuel chamber and configured to selectively open and close the supply inlet;
- and
- a supply-side biasing member configured to bias the supply-side valve body such that the supply inlet is closed, and
- wherein the supply-side valve body is a portion of the diaphragm other than the diaphragm actuating portion.
A diaphragm pump comprising:
- 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,
- wherein 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.
Dependencies are inferred from the claim text.