Circuito de Descarga: Dos Bombas - Parte 1

Introduction to Hydraulic Circuits with Two Pumps

Overview of the Circuit

• The video introduces a hydraulic circuit featuring two pumps, focusing on its industrial applications and schematic representation.

• A discharge circuit with two pumps is defined, emphasizing its purpose to divert flow from one pump to a low-pressure tank during part of the work cycle.

• The circuit typically includes two pumps (A and B), which usually have different volumetric capacities—one being a low-flow pump (B) and the other a high-flow pump (A).

Components of the Circuit

• Key components include a discharge valve (C), which is normally closed and has external piloting connected to pump B's discharge.

• A safety valve is also present, represented in the schematic, which is normally closed but features internal piloting connected directly before it.

• An anti-return valve allows flow in one direction while blocking reverse flow; it connects the lines from both pumps.

Functions of the Discharge Circuit

Desired Outcomes

• The primary functions are achieving rapid advancement at low pressure and slow advancement at high pressure while minimizing energy loss or excessive heat dissipation during operation.

System Parameters

• Important parameters include:

• q_a : Flow rate from pump A.

• q_b : Flow rate from pump B.

• p_d : Setpoint for the discharge valve, determining when it opens based on system pressure.

Operational Scenarios

Situation Analysis

• When system demand is below the setpoint of 1000 psi for the discharge valve, both pumps contribute their flow rates to meet system needs effectively.

Pressure Dynamics

• If system pressure remains below this threshold (e.g., at 500 psi), both valves remain closed, allowing full flow into the system without diversion to tanks.

Equal Pressure Conditions

Transitioning Pressures

• As system pressure reaches 1000 psi, equalizing with the discharge valve's setpoint causes that valve to open while keeping safety measures intact.

Flow Changes

• In this scenario, only pump A’s output flows into the tank as it becomes less resistant than overcoming friction losses in pipes.

Increased Demand Scenarios

Higher System Pressures

• If demand rises above 1000 psi but remains under safety limits (1500 psi), only pump B operates while maintaining efficiency by reducing energy consumption through lower operational pressures.

Safety Valve Activation

• At pressures reaching 1500 psi, both valves open simultaneously directing all flows back to tanks instead of supplying additional fluid to systems.

Summary of Circuit Functionality

Key Takeaways

• Rapid advancements occur when demand is below discharge settings; both pumps supply fluid efficiently.

• Slow advancements happen when pressures equalize with discharge settings; only one pump operates effectively reducing energy waste.

• Both valves opening indicates maximum demand exceeding safe operating conditions leading all outputs back towards tanks.

In future videos, further exploration will be conducted using detailed schematics for better understanding.