Integrated Water Purifier Flow Path for Hot and Purified Water

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Solution Overview

Problem

Conventional water purifiers require separate flow paths for cold, purified, and hot water, leading to increased complexity, space utilization, and cost.

Innovation Solution

A water purifier design that ejects hot and purified water through a single flow path using a hot water module to heat purified water and a flow switching valve to control the flow, eliminating the need for a separate purified water flow path and purification valve.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate flow paths are provided for cold water, purified water, and hot water, then temperature control and water quality are ensured, but device complexity and space utilization deteriorate

Engineering Contradiction:
Improvetemperature controlVSAvoidflow path structure
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the purified water flow path and hot water flow path into a single common flow path. The water ejection nozzle receives both purified water and hot water through the same flow path structure, reducing the number of separate pipes and valves while maintaining the ability to control temperature and water quality through selective valve operation.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The common flow path serves multiple functions by transporting both purified water and hot water to the ejection nozzle. The flow path structure is designed to handle different water types and temperatures universally, eliminating the need for dedicated separate paths for each water type.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Reliability

If separate flow paths for purified water and hot water are provided, then water quality and temperature are maintained, but manufacturing cost and material usage increase

Engineering Contradiction:
Improvewater qualityVSAvoidmanufacturing cost
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines multiple flow paths into a single common flow path that transports both purified water and hot water. This merging reduces the total amount of piping materials, valves, and connection points required, thereby lowering manufacturing costs and material usage while maintaining water quality through proper valve control.

Inventive Principle:
Principle #5Merging (Combining)

3Temperature

If separate flow paths are used for purified water and hot water, then temperature conditions are maintained, but device size and space requirements increase

Engineering Contradiction:
Improvetemperature conditionVSAvoiddevice size
Core Design Contradiction:
TemperatureVSVolume of moving object

Solution Approach 1:

The patent merges the purified water and hot water flow paths into a single common flow path that shares the same physical space within the device. This consolidation reduces the overall volume occupied by piping and associated components, making the device more compact while maintaining proper temperature conditions through controlled water delivery.

Inventive Principle:
Principle #5Merging (Combining)

4Device complexity

If a single flow path is used for both purified water and hot water, then device complexity and material cost are reduced, but temperature control and water quality may deteriorate

Engineering Contradiction:
Improveflow path structureVSAvoidtemperature control
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent segments the water delivery system into distinct controlled sections: a purified water supply section, a hot water supply section, and a common ejection section. Flow switching valves create virtual segmentation within the physical flow path, allowing independent control of purified water and hot water streams until they converge at the ejection nozzle, thereby maintaining temperature control despite the merged physical path.

Inventive Principle:
Principle #1Segmentation

5Ease of manufacture

If a single flow path is used for both purified water and hot water, then manufacturing cost and device size are reduced, but maintenance complexity and safety risks may increase

Engineering Contradiction:
Improvemanufacturing costVSAvoidtemperature mixing risk
Core Design Contradiction:
Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent implements preliminary flow separation and control before water convergence. Flow switching valves are positioned to control and separate purified water and hot water flows upstream of the common flow path section. This preliminary control prevents unwanted temperature mixing and ensures that only properly controlled water streams are delivered through the shared path, mitigating safety risks while maintaining manufacturing simplicity.

Inventive Principle:
Principle #10Preliminary action

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

Reduces material and maintenance costs, decreases size, maintains temperature conditions, and ensures safe ejection by integrating hot and purified water paths, preventing temperature increase and enabling sterilization.

Implementation Method 1

a hot water module configured to heat purified water received from the filter to generate hot water when hot water should be ejected

Methodology Applied
Scientific EffectHeating: Heating

Implementation Method 2

a flow switching valve installed to control the flow of water flowing from the water supply flow path to the auxiliary flow path

Methodology Applied
Scientific EffectValve control: Valve

Data Source

PatentEP4074661B1Water purifier
Publication Date: 2026.01.28 LG ELECTRONICS INC
  • EP4074661B1 patent drawingFigure 1
  • EP4074661B1 patent drawingFigure 2
  • EP4074661B1 patent drawingFigure 3

AI summary

The present disclosure relates to a water purifier which ejects hot water and purified water, and the water purifier includes a filter configured to purify water supplied from an external water supply source; a water supply flow path configured to guide the water supplied from the water supply source toward the filter; an auxiliary flow path configured to branch off at the first point of the water supply flow path and then to merge into a second point of the water supply flow path located at a rear end of the first point based on the flow direction of water; a flow switching valve configured to be installed at the first point to control the flow of water flowing from the water supply flow path to the auxiliary flow path; a water ejection nozzle through which water passing through the filter is ejected; a hot water module forming a heating flow path through which the purified water passing through the filter passes and configured to instantaneously heat the purified water passing through the heating flow path into hot water when hot water is ejected; a hot water flow path configured to guide the hot water passing through the hot water module toward the water ejection nozzle; and a controller configured to control the operation of the flow switching valve and the hot water module.