Pump for a dishwashing machine and corresponding pump assembly and dishwashing machine
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Solution Overview
Problem
Dishwashing machines with synchronous electric pumps face challenges such as high startup torque requirements, noise due to mechanical joints, bidirectional motor issues, and inefficient hydraulic flow due to lack of electronic control in discharge pumps, leading to oversizing and increased costs.
Innovation Solution
Implementing a master pump with electronic motor control circuitry that can control a slave pump, allowing controlled startup and directional vanes, eliminating the need for mechanical joints and reducing costs by correctly sizing the discharge pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a synchronous electric motor is used in the discharge pump without electronic control, then the pump structure is simpler and costs are lower, but the motor must be oversized to provide high starting torque and operates noisily
Solution Approach 1:
The patent merges the control functions of multiple pumps into a single electronic control unit. The master pump's electronic motor control circuitry manages both the master and slave pumps, eliminating the need for separate control circuits in each pump while providing coordinated control and reduced overall system complexity.
Solution Approach 2:
The electronic motor control circuitry of the master pump is designed to control multiple pumps (both master and slave pumps). This multi-functional control capability allows a single control unit to manage different pump operations, reducing the need for separate control systems and lowering overall costs.
2Force
If a mechanical joint is used to disengage the motor from the load during startup, then the motor can start without bearing the full load, but noise increases during synchronous operation due to non-rigid connection
Solution Approach 1:
The patent replaces the mechanical joint system with an electronic control system. The electronic motor control circuitry provides soft startup control that gradually increases motor speed without requiring mechanical disengagement mechanisms. This eliminates the noisy mechanical joint while maintaining the ability to manage starting torque requirements.
3Ease of operation
If a single-phase synchronous motor without electronic control is used, then the motor is bidirectional and requires additional hydraulic means, but adding electronic control increases cost and complexity
Solution Approach 1:
The patent combines the control functions for multiple pumps into a single electronic control unit. By merging the slave pump control with the master pump's existing electronic control circuitry, the system achieves unidirectional control and directional vane operation without requiring separate control systems, thus avoiding increased complexity and cost.
4Reliability
If the discharge pump is oversized to provide high starting torque, then startup is successful, but the pump is less efficient and more costly during normal operation
Solution Approach 1:
The patent implements dynamic control of the discharge pump through electronic motor control circuitry. The system can adjust motor speed and torque characteristics in real-time, providing high starting torque when needed during startup while operating at optimal efficiency during normal discharge operations. This dynamic adjustment eliminates the need for permanent oversizing.
Solution Approach 2:
The electronic motor control circuitry enables dynamic parameter changes in the motor's operating characteristics. During startup, the control system adjusts parameters to provide high starting torque, then transitions to optimized parameters for efficient normal operation. This parameter adaptability allows the pump to be correctly sized without permanent oversizing.
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 results in quieter, efficiently sized, and hydraulically effective pumps with controlled startup and directional vanes, reducing noise and costs by leveraging a single electronic circuit for both pumps, enhancing overall dishwashing machine performance.
Implementation Method 1
an electric motor, an impeller and electronic motor control circuitry, said electric motor being able to rotate said impeller
Implementation Method 2
allowing water to flow according to a predetermined direction
Data Source
AI summary
A pump (2') for dishwashing machines is described, comprising an electric motor (21'), an impeller (23') and electronic motor control circuitry (27'), the electric motor (21') being able to rotate the impeller (23'), the electronic motor control circuitry (27') being able to control the electric motor (21'). Advantageously, the electronic motor control circuitry (27') is structured to control the electric motor (31') of an additional pump (3'). Furthermore, a pump assembly for a dishwashing machine (6') is described, comprising a master pump (2') and at least one slave pump (3'), the master pump (2') being of above said type, the at least one slave pump (3') being electrically connected to the electronic motor control circuitry (27') and being electronically controlled by the electronic motor control circuitry (27'). A dishwashing machine (1') is also described, comprising a pump assembly of above said type, the dishwashing machine (1') being hydraulically connected, on the inlet side, by means of suction, to the water distribution system, through the at least one washing pump (2') and being connected, on the outlet side, to the water distribution system or to a drain, through the at least one discharge pump (3').