Pressurized fluid recovery/reutilization system
First Claim
1. A pressurized fluid recovery/reutilization system comprising a primary hydraulic pump supplying a pressurized fluid returned from an actuator, a first circuit supplying the returning pressurized fluid from the actuator, a first pump motor connected to said first circuit, a variable displacement type second pump motor mechanically coupled with said first pump motor and connected to a second circuit, a third circuit communicating said first circuit and a discharge passage of said primary hydraulic pump, a pressure accumulator provided in said second circuit, and a reproduction valve switching said third circuit between a state permitting the flow of a pressurized fluid and a state blocking the flow.
1 Assignment
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Accused Products
Abstract
Energy of returning pressurized fluid of an actuator is recovered and reused as energy for operating other accumulators. A first pump motor (16) and a second pump motor (17) are mechanically connected to form a pressure converter (18), and a first circuit (22), to which the returning pressurized fluid is supplied, is connected to the first pump motor (16). A pressure accumulator (27) is provided to a second circuit (25) connected to the second pump motor (17). The first circuit (22) is connected to a discharge passage (11) of a primary hydraulic pump (10) by a third circuit (29) and the pressure of a high pressure pressurized fluid is supplied to the discharge passage (11) by the pressure of the high pressure pressurized fluid, and is reused.
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Citations
5 Claims
- 1. A pressurized fluid recovery/reutilization system comprising a primary hydraulic pump supplying a pressurized fluid returned from an actuator, a first circuit supplying the returning pressurized fluid from the actuator, a first pump motor connected to said first circuit, a variable displacement type second pump motor mechanically coupled with said first pump motor and connected to a second circuit, a third circuit communicating said first circuit and a discharge passage of said primary hydraulic pump, a pressure accumulator provided in said second circuit, and a reproduction valve switching said third circuit between a state permitting the flow of a pressurized fluid and a state blocking the flow.
- 3. A pressurized fluid recovery/reutilization system comprising a primary hydraulic pump supplying a pressurized fluid returned from a plurality of actuators, a first circuit supplied the returning pressurized fluid from the actuators, a recovery valve for switching said first circuit between a first state permitting flow of the pressurized fluid and a second state blocking the flow, a plurality of solenoid valves provided between said actuators and said recovery valve, respectively and each being placed at a first position to supply the returning pressurized fluid to said recovery valve or a second position to drain the returning pressurized fluid to a tank, a pressure converter having a first pump motor connected to said first circuit, a variable displacement type second pump motor mechanically coupled with said first pump motor and connected to a second circuit, a third circuit communicating said first circuit and a discharge passage of said primary hydraulic pump, a pressure accumulator provided in said second circuit, a reproduction valve switching said third circuit between a state permitting the flow of a pressurized fluid and a state blocking the flow, a pressure accumulation valve provided for establishing and blocking communication of said second circuit, and a sequence valve provided between said second circuit on the side of said second pump motor of said pressure accumulation valve and the discharge passage of the primary hydraulic pump.
Specification