Reversible-Motor Refrigerant Service Machine Without Clutch Shifting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Maintenance machines for refrigeration units require complex clutch operations to switch between compressor and vacuum pump drives, leading to increased operational complexity and investment costs for service companies.
Innovation Solution
A reversible electric motor is connected to both the compressor and vacuum pump via freewheels, allowing selection of the driven component by reversing the motor's rotation direction, eliminating the need for clutches and enabling a single motor to power either unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a motor with two shafts and clutches is used to drive both compressor and vacuum pump, then both functions can be integrated in one machine, but the operational complexity increases due to clutch shifting requirements
Solution Approach 1:
The patent divides the drive system into two independent single-shaft motors, where each motor independently drives one component (compressor or vacuum pump). This segmentation eliminates the need for complex clutch mechanisms and multi-shaft coordination, allowing simple switching between functions by activating one motor at a time, thus reducing operational complexity while maintaining functional integration
Solution Approach 2:
Each single-shaft motor is designed to be universally applicable to its designated component, with the overall system achieving multi-functionality through the combination of two simple motor-driven units. This universal design approach allows the maintenance machine to perform both refrigerant recovery and vacuum pumping functions using straightforward motor activation without complex transmission mechanisms
2Reliability
If separate maintenance machines for refrigerant recovery and vacuum pumping are used, then each machine can be optimized for its specific function, but the total weight and investment costs increase
Solution Approach 1:
The patent combines two separate maintenance machines (refrigerant recovery machine and vacuum pump machine) into a single integrated unit. By merging the two functions into one physical platform with shared structural components, control systems, and power supply, the total weight is reduced while maintaining the optimized functionality of both the compressor-driven refrigerant recovery system and the motor-driven vacuum pumping system
3Device complexity
If a single motor selectively drives compressor or vacuum pump via freewheels with opposite rotational directions, then device complexity is reduced by eliminating clutches, but the motor control system becomes more complex
Solution Approach 1:
The patent replaces the mechanical clutch-shifting system with an electrical motor control system. Instead of using mechanical engagement and disengagement of clutches to switch between compressor and vacuum pump drives, the system uses electronic control to reverse the motor's rotational direction. This substitution eliminates complex mechanical transmission components while introducing electronic control mechanisms, thereby reducing mechanical device complexity
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
This solution simplifies the drive operation, reduces the need for separate machines, and lowers investment costs by allowing a single lightweight maintenance machine to perform both refrigerant recovery and vacuum pumping functions with reduced complexity and weight.
Implementation Method 1
a reversible electric motor is connected to both the compressor and vacuum pump via freewheels, allowing selection of the driven component by reversing the motor's rotation direction
Implementation Method 2
A first freewheel is provided between the motor and the compressor and a second freewheel is provided between the motor and the vacuum pump
Data Source
AI summary
For refrigeration units, maintenance machines are required that can receive and compress the refrigerant from the refrigeration unit. Furthermore, a vacuum pump is required, which is connected to the emptied lines and pumps out humidity and air. The maintenance machine according to the invention includes a motor that drives a compressor via a freewheel in one rotational direction. The same motor drives a vacuum pump via a second freewheel in the other rotational direction. The maintenance machine, which can perform two different functions, includes only one single motor. The machine is lightweight, so that it can be carried by the maintenance personnel. Furthermore, it is small and can be produced in a cost-effective manner.