Priority Hydraulic Flow Diverter for Refuse Vehicles
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Solution Overview
Problem
Existing hydraulic systems for refuse collection vehicles lack precise control of hydraulic fluid flow to refuse cart lifters, leading to inconsistent operation, excessive pressure drops, and potential component failures, especially when dealing with varying pump speeds and system flow rates.
Innovation Solution
A priority hydraulic flow diverter control assembly utilizing a differential pressure sensing valve and flow regulating valves with an orifice to maintain consistent flow to refuse cart lifters, while reducing pressure differential and preventing downstream blockages, using a pressure sequence valve to divert flow efficiently and a relief valve to manage pressure, thereby stabilizing the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple tee fitting is used to divert hydraulic fluid flow, then the system structure is simple, but the flow control precision deteriorates
Solution Approach 1:
The patent uses an adjustable orifice mechanism that allows the flow rate parameter to be precisely controlled and modified. By changing the orifice opening size, the system can regulate hydraulic fluid flow to the refuse cart lifters independently of pump speed variations, achieving precise flow control without complex system architecture.
2Measurement precision
If an orifice is placed in the outlet line to restrict flow, then the flow control precision improves, but the pressure drop increases
Solution Approach 1:
The patent employs a dynamically adjustable orifice mechanism that can adapt its opening size based on system conditions. This dynamic adjustment capability allows the system to maintain precise flow control while minimizing pressure drop by optimizing the orifice opening for different flow requirements, rather than using a fixed restrictive orifice.
3Measurement precision
If a priority flow valve with orifice is used, then the flow control precision improves, but the pressure required to operate the valve increases
Solution Approach 1:
The patent introduces a flow divider valve as an intermediary component between the priority flow valve and the refuse cart lifters. This flow divider valve evenly divides the hydraulic fluid flow from the priority flow valve to multiple lifters, enabling precise flow control to each lifter while reducing the operating pressure requirement compared to using only a priority flow valve with orifice.
4Adaptability or versatility
If the pump speed varies, then the system adaptability improves, but the flow consistency deteriorates
Solution Approach 1:
The patent implements a flow control mechanism that provides feedback compensation for pump speed variations. The adjustable orifice system allows operators to compensate for changes in pump output flow caused by engine speed variations, maintaining consistent flow rates to the refuse cart lifters regardless of pump speed fluctuations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures consistent operation of refuse cart lifters at controlled speeds, reduces pressure drops, and minimizes the risk of component failures and heat-related issues, ensuring efficient and safe operation of hydraulic systems.
Implementation Method 1
The present priority hydraulic flow diverter control assembly uses a differential pressure sensing valve and flow regulating valves with an orifice to maintain consistent flow to refuse cart lifters
Implementation Method 2
The flow regulating valves employ an orifice to meter hydraulic fluid flow to the refuse cart lifters
Implementation Method 3
using a pressure sequence valve to divert flow efficiently and a relief valve to manage pressure
Data Source
AI summary
A priority hydraulic flow diverter control assembly for a refuse collection vehicle hydraulic system provides proper and efficient flow in an auxiliary hydraulic circuit regardless of the primary flow so that refuse cart lifters and the refuse cart operate safely and efficiently. A pressure sequence valve diverts hydraulic fluid flow from the refuse cart lifter circuit into the downstream main hydraulic system when downstream back pressure is low, and into the system tank when back pressure is high. This allows all hydraulic operated equipment to operate at their intended speed whether at high or low system back pressure.A differential pressure sensing valve and flow regulating valves provide a precision flow. Harmful and undesirable vibrations and noise associated with pulses in hydraulic system pressure are reduced using a control orifice located in the valve body. A relief valve ensures that the diverter control assembly is compatible with other manufacturer's products.