Stepper-Controlled Multipath Valve for Milk Flow and Line Cleaning
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Solution Overview
Problem
Existing multi-way valve arrangements in espresso machines are inefficient in controlling milk flow for hot milk and milk froth preparation, leading to excessive steam usage and inconsistent milk temperatures, and often fail to effectively clean milk-carrying lines due to their mechanical design and limited functionality.
Innovation Solution
A compact multi-way valve with a stepper motor-controlled throttling function that adjusts the valve body to optimize milk flow for both hot milk and milk froth preparation, allowing for precise steam usage and automated line cleaning without separate solenoid valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solenoid valves with fixed line cross-sections are used to control milk flow, then the valve arrangement can be implemented with standard components, but the steam consumption increases excessively and milk temperature control becomes inconsistent
Solution Approach 1:
The valve body is made adjustable relative to the housing, allowing the effective flow cross-section to be dynamically changed. The valve body can be positioned in different angular orientations (0°, 45°, 90°, 135°) to throttle the milk flow to different extents, enabling optimization of steam consumption for different milk preparation requirements while maintaining consistent temperature control.
2Device complexity
If solenoid valves with fixed line cross-sections are used, then the valve structure is simple, but the milk flow quantity cannot be optimized for different preparation types leading to energy waste
Solution Approach 1:
The valve body is made adjustable relative to the housing, allowing the effective flow cross-section to be dynamically changed. The valve body can be positioned in different angular orientations (0°, 45°, 90°, 135°) to throttle the milk flow to different extents, enabling optimization of steam consumption for different milk preparation requirements while maintaining consistent temperature control.
3Device complexity
If mechanical multi-way valves are used for compact design, then fewer connections are needed, but automated cleaning functions are lost and milk residues remain in lines
Solution Approach 1:
The valve system is designed to perform multiple functions: it controls milk flow to the frothing device, regulates steam consumption for heating, and enables automated cleaning of milk-carrying lines. The programmable controller coordinates the valve body position and solenoid valve actuation to achieve both preparation and cleaning functions through a single integrated system.
4Ease of operation
If the same milk flow is supplied for both hot milk and milk froth preparation, then the valve control is simple, but excessive steam is required for hot milk preparation increasing production costs
Solution Approach 1:
The valve body is made adjustable relative to the housing, allowing the effective flow cross-section to be dynamically changed. The valve body can be positioned in different angular orientations (0°, 45°, 90°, 135°) to throttle the milk flow to different extents, enabling optimization of steam consumption for different milk preparation requirements while maintaining consistent temperature control.
Solution Approach 2:
A temperature sensor detects the milk temperature and provides feedback to the programmable controller. The controller adjusts the valve body position and solenoid valve actuation based on this feedback to maintain the desired milk temperature, preventing both overheating and insufficient heating, thereby optimizing steam energy usage.
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 enables efficient steam usage for both hot milk and milk froth preparation, ensuring accurate temperature control and effective cleaning of milk-carrying lines, reducing production costs and improving hygiene.
Implementation Method 1
The throttling is effected by adjustment of the valve body relative to the body of the multi-way valve with orifices cooperating with flow paths of the valve body, by means of a stepper motor which adjusts the valve body position according to a programmable controller.
Implementation Method 2
the same low steam supply capacity is sufficient for heating the milk for both preparation cases
Implementation Method 3
With the compact multi-way valve of this multi-way valve arrangement, not only flow paths, in particular of the cold milk for the preparation of hot milk or milk foam, are switched over
Implementation Method 4
an air solenoid valve (14), which controls the admission of air or steam to the milk line (10)
Data Source
Figure 1a~1d
Figure 2
Figure 3a~3d
AI summary
The arrangement has a cold milk inlet (5) or a cool water inlet (7) connected with a valve outlet (6) by using a valve body (3). A multipath valve (1) has a housing (2) comprising the inlets, an outlet and an air opening (9). The valve body is inserted into the air opening for connecting the milk inlet with an adjustable throttle via the outlet. The valve body is adjustable by a stepper motor (4) provided with a programmable control controlling a valve body position. The valve body is formed as an inner cylinder with a set of valve paths.