Section Bar Heater Assembly for Simpler Duct Brazing
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Solution Overview
Problem
Existing fluid flow heaters for coffee machines face challenges in simplifying the machining process and minimizing brazing material usage, especially when adapting to extreme bending angles and shapes, as traditional methods complicate the machining of ends for fluid circulation ducts and require costly cutting operations.
Innovation Solution
A section bar design with a longitudinal cavity for housing a tubular duct and a separate cavity for the resistor, allowing lateral insertion and bending of lugs to create a groove for simplified brazing, enabling machining of duct ends before insertion and facilitating bending into various shapes without pre-brazing, thus simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brazing procedure is performed prior to bending/winding of the resistor, then the coupling between encased resistor and tubular duct is achieved, but the brazing operation becomes complicated and the resistor is deteriorated by subsequent bending/winding
Solution Approach 1:
The patent applies preliminary action by performing the brazing operation on the tubular duct before the bending/winding of the heater assembly. The tubular duct is brazed to the support element in its straight state, and only after this coupling is established does the bending/winding operation occur. This sequence prevents the brazed joints from being deteriorated by subsequent deformation operations while maintaining reliable coupling between the components.
2Adaptability or versatility
If the heater is bent/wound in its final form, then adaptability to extreme bending angles is achieved, but the brazing operation becomes complicated and requires more brazing material
Solution Approach 1:
The patent performs the brazing operation in advance, before the heater assembly is bent or wound into its final configuration. The tubular duct is brazed to the support element while the assembly is still in a straight, accessible state, allowing for simple brazing operations with minimal material. After brazing, the assembly can then be bent or wound to achieve extreme angles and complex shapes without complicating the brazing process or requiring additional brazing material.
3Ease of manufacture
If one support element simultaneously defines the encased resistor and the tubular duct, then brazing of the resistor is eliminated, but costly cutting and turning operations on the ends of the fluid circulation duct are required
Solution Approach 1:
The patent segments the heater assembly into separate functional components: a support element that provides structural framework and positioning, and a tubular duct that handles fluid circulation. By separating these functions into distinct elements rather than integrating them into a single monolithic component, the patent eliminates the need for costly cutting and turning operations on the duct ends, as each component can be manufactured independently with standard machining operations.
4Ease of manufacture
If the ends of the tubular duct are machined and prearranged prior to insertion in the section bar, then machining simplicity is improved, but the insertion process becomes more complex
Solution Approach 1:
The patent applies preliminary action by machining and prearranging the ends of the tubular duct before insertion into the section bar. The duct ends are prepared with appropriate fittings, threads, or connection features in advance, allowing for simple standard machining operations. The section bar is designed with a receiving structure that guides and accommodates the pre-prepared duct, making the insertion process straightforward despite the preliminary preparation of the duct ends.
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 design simplifies the machining and brazing operations, reduces material usage, and allows for versatile heater shapes by enabling accessible brazing and pre-machining of duct ends, improving the overall manufacturing efficiency and adaptability of fluid flow heaters.
Implementation Method 1
The heating of water in coffee machines is achieved by means of encased resistors, wherein the resistance wire is generally spiral-wound inside a casing
Implementation Method 2
the brazing operation of said groove is simplified since it is accessible irrespective of the shape, for example spiral shape, of the heater obtained
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The section bar (1 ) for a fluid flow heater for coffee machines has a longitudinal development with two opposing ends and a first tubular cavity (A), that is accessible at the opposing ends of the section bar (1 ), and a second cavity (B) having an opening (O) that extends along the longitudinal development of the section bar (1). A heater (10) having an encased resistor (2, 3) integrated in the first cavity (A) of the section bar (1) and a tubular fluid circulation conduit (4) inserted into the second cavity (B) of the section bar (1) and fixed by means of bending at least one lug (B1, B2, B3) around the tubular fluid circulation conduit (4), so that the opposing ends of the tubular fluid circulation conduit (4) emerge with respect to the opposing ends of the section bar (1).