Washing Machine Drain Pump Pressure Relief to Reduce Impeller Noise
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Solution Overview
Problem
Existing washing machines, particularly roller types, generate noise during drainage due to water flow impact on the draining pump's impeller, and existing noise reduction solutions fail to effectively address this issue, leading to incomplete drainage and noise pollution.
Innovation Solution
A draining pump device with a pump shell featuring a front and rear pump chamber arrangement, a spinning blade coaxial with the motor, a filter with a pressure relief plate and holes, and a cylindrical filter structure that allows air pressure release, reducing noise by preventing backwater impact on the impeller during spin drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the draining pump runs continuously during spinning to ensure complete drainage, then drainage completeness is improved, but noise increases due to water flow impact on the impeller
Solution Approach 1:
The pump shell is divided into a front pump chamber and a rear pump chamber separated by a partition plate. The front chamber contains the impeller and handles water intake, while the rear chamber receives water from the front chamber through a communication hole. This segmentation allows the impeller to operate in a controlled environment without direct exposure to turbulent water flow from the drain pipe, reducing noise while maintaining drainage effectiveness.
Solution Approach 2:
The communication hole between the front and rear pump chambers acts as an intermediary structure. Water flows from the front chamber through this hole to the rear chamber, creating a buffer zone that prevents direct impact of drain pipe water on the impeller. This intermediary pathway reduces the harmful water flow impact while ensuring continuous drainage operation.
2Reliability
If the pump shell is sealed to prevent water leakage, then sealing performance is improved, but air pressure buildup increases causing noise and incomplete drainage
Solution Approach 1:
The partition plate between the front and rear pump chambers includes a localized communication hole that allows controlled air and water passage. This local opening in an otherwise sealed structure enables pressure equalization between chambers, preventing air pressure buildup while maintaining overall sealing performance to prevent water leakage.
Solution Approach 2:
The communication hole in the partition plate functions as a controlled porous pathway, allowing air and water to pass through while maintaining the sealed structure. This enables pressure relief without compromising the overall sealing integrity of the pump shell.
3Object-affected harmful factors
If existing noise reduction methods are applied, then noise is reduced, but they fail to address the root cause of backwater impact on the impeller
Solution Approach 1:
The front pump chamber serves as a preliminary processing zone where water is drawn in and prepared before entering the rear chamber. The communication hole is positioned to allow water to flow from the front to rear chamber before reaching the impeller area, preemptively reducing the impact force of backwater on the impeller and addressing the root cause of noise rather than just masking it.
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 effectively reduces noise pollution during the washing machine's operation by allowing air pressure release through pressure relief holes, ensuring continuous drainage without stopping the pump and maintaining low failure rates at a low cost.
Implementation Method 1
a pressure relief plate with pressure relief holes is arranged at one side of the filter outlet of the filter next to the spinning blade
Data Source
AI summary
A draining pump for a washing machine and the washing machine thereof are disclosed. The washing machine includes an inlet system, and a draining system containing the draining pump device. The draining pump has a draining motor, a pump shell, a spinning blade and a filter, wherein, an inlet nozzle and an outlet nozzle are also arranged on the pump shell, and the pump shell is internally arranged with a front pump chamber and a rear pump chamber which are communicated according to the water draining sequence; the spinning blade is arranged in the rear pump chamber and installed coaxially with a revolving shaft of the drain motor, the filter is arranged in the front pump chamber, and a pressure relief plate with pressure relief holes is arranged at one side of the outlet of the filter corresponding to the water spinning blade.