Mitsui Engineering and Shipbuilding Company Limited

Mitsui E&s Machinery Co., Ltd.

Mitsui Engineering & Shipbuilding

Makoto Kounosu

Renzo Kanda

Seiichi Kitamura

Kazushige Ohta

The present invention prevents a gas generated by evaporating a low-temperature liquid from remaining in an internal space of a booster pump and enhances efficiency of discharge and suction. A reciprocating booster pumpincludes a cylindera pistona suction check valveand a discharge check valveThe cylinderhas a suction portand a discharge portThe suction portsuctions a low-pressure, low-temperature liquid to an inside. The discharge portboosts the low-temperature liquid and discharges the low-temperature liquid to an outside. The pistonreciprocates in an internal spaceof the cylinder. The suction check valveopens and closes a suction flow passagebetween the internal space and the suction port. The discharge check valveopens and closes a discharge flow passagebetween the internal space and the discharge port. The suction check valve is configured such that if a relative pressure at the internal space establishing a pressure of the low-temperature liquid before being suctioned into the cylinder as a criterion is higher than a predetermined pressure, the suction check valve closes.

Booster pump

A fuel supply device includes: a linear actuator; a reciprocating pump having a boosting piston driven by the linear actuator and configured to reciprocate in an axial direction, the reciprocating pump being configured to suck the fuel when the boosting piston moves in a first direction and configured to boost and eject the fuel when the boosting piston moves in a second direction; and a controller configured to control driving of the linear actuator so as to adjust an amount of the fuel ejected from a boosting cylinder per reciprocating time by adjusting a ratio of a fuel ejection time and a fuel suction time of the reciprocating pump without changing the reciprocating time of the boosting piston in accordance with a load of the internal combustion engine. The adjustment adjusts a stroke length of the boosting piston and a moving speed of the boosting piston in the second direction.

Fuel supply device and fuel supply method

A fuel supply device for supplying fuel into a combustion chamber of an internal combustion engine is provided. The device includes: a low pressure fuel supply pipe to which a low pressure fuel is supplied; a high pressure fuel supply pipe to which high pressure fuel to be supplied into the combustion chamber is supplied; fuel supply units provided between the low pressure fuel supply pipe and the high pressure fuel supply pipe, each of the fuel supply units being configured to boost the fuel in the low pressure fuel supply pipe and supply the boosted fuel to the high pressure fuel supply pipe; and a control unit configured to control the fuel supply units. The control unit controls the fuel supply units such that a total amount of ejection of the fuel ejected from the fuel supply units per unit time is close to a constant value.

A fuel supply device includes: a linear actuator; a reciprocating pump having a boosting piston driven by the linear actuator, configured to axially reciprocate, and configured to alternately repeat suction of the fuel and ejection of the fuel more boosted than the fuel at a time of suction by reciprocation of the boosting piston; and a controller to control driving of the linear actuator. When reciprocation amplitude of the boosting piston is A (A&#x3e;0) and a reciprocating cycle time is T, the controller controls the linear actuator so a maximum value of an absolute value of acceleration when the reciprocating pump sucks the fuel with an absolute value of speed of the boosting piston increasing is smaller than A&#xb7;(2&#x3c0;/T), and so a maximum value of the absolute value of the acceleration of the boosting piston when the reciprocating pump ejects the fuel is larger than A&#xb7;(2&#x3c0;/T).

A fluid intake/discharge valve body for suction of a cryogenic liquefied gas fluid into a cylinder liner and discharge of the gas fluid with a piston, includes: a valve seat body including a fluid supply portion to supply the fluid and a fluid exhaust portion; an intake valve biased against the fluid supply portion; and a discharge valve biased against the fluid exhaust portion. The fluid supply portion includes a supply pathway connected to a supply pipe; a dividing wall including intake holes facing the intake valve; and a counterbore recessed portion on the dividing wall to surround the intake holes. The intake valve abuts an edge of the recessed portion when biased against the fluid supply portion. The discharge valve receives fluid pressure from a side of the discharge hole including a recessed portion disposed in a region wider than an outer periphery of the discharge hole.

Growing community of inventors

Tokyo, Japan

Makoto Kounosu