Modular Ejector Cartridge Design for Refrigerating Machine Maintenance
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Solution Overview
Problem
Traditional ejectors for refrigerating machines face difficulties in maintenance due to complex structures and tight tolerances, making correct insertion and extraction of components challenging, and require precise alignment for reliable operation.
Innovation Solution
The ejector is designed with a modular structure comprising a main body and a removable cartridge organ that includes the nozzle, closure member, and activating group, allowing for easier assembly and disassembly, and utilizing a connector element with centring mechanisms to maintain precise alignment and simplify maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nozzle and closure member are fixed as a single body in the main body, then the structure is compact and reliable, but maintenance and extraction of components become awkward and complex
Solution Approach 1:
The ejector is divided into separable components: the nozzle (15) and closure member (16) assembly can be removed as a cartridge from the main body (11). This segmentation allows easy maintenance and replacement while maintaining reliable operation during use, directly resolving the contradiction between reliability and ease of repair.
2Manufacturing precision
If tight tolerances are required for correct insertion and movement, then precise alignment is achieved, but manufacturing complexity and difficulty increase
Solution Approach 1:
Centring mechanisms (such as centring collars or guide features) are pre-built into the nozzle and main body structure. These preliminary centring features automatically align the closure member with the nozzle hole during insertion, eliminating the need for tight tolerances and complex manual alignment procedures, thus resolving the contradiction between manufacturing precision and ease of manufacture.
3Ease of operation
If the ejector structure is simplified for easier maintenance, then assembly and disassembly become easier, but alignment precision may be compromised
Solution Approach 1:
Connector elements and centring mechanisms act as intermediaries between the simplified modular components. These intermediaries automatically maintain precise alignment when components are assembled, allowing easy maintenance operations while preventing alignment drift over time, thus resolving the contradiction between ease of operation and manufacturing precision.
Data Source
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AI summary
An ejector (10) for a refrigerating machine, comprising: - a main body (11) crossed by a conduit (12) for passage of refrigerant fluid and having a compartment (13) which comprises a seating (13a), which is in communication with said conduit (12), and a mouth (14) for inlet of refrigerant fluid; - a nozzle (15) which can be coupled with the seating (13a) and having an internal hole (15a), for passage of the refrigerant fluid; - a shutter (16) having an end (16a) which can be coupled with the hole (15a) so as to close the hole (15a); - an activating group (17) of the shutter (16) for modulating the flow rate of refrigerant fluid; - a connector element (18) which can be fixed to the activating group (17) and to the nozzle (15) so as to form therewith a cartridge organ (19) that is autonomous with respect to the main body (11). The ejector (10) comprises coupling means (20a, 20b) able to fix the cartridge organ (19) to the main body (11) and where the fixture can be removed and sealed.