Compressor Cover Port Inclination for Machining Error Reduction
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Solution Overview
Problem
Conventional compressors face complex machining procedures and errors due to non-parallel surfaces, leading to increased production costs and inefficiencies in the machining of the cover member defining the muffler chamber.
Innovation Solution
The compressor design features an inner peripheral surface of the connection port with a predetermined inclination angle orthogonal to both the attachment and abutment surfaces, simplifying machining directions and reducing the complexity of machining procedures by aligning these surfaces in one direction, thereby reducing production costs and enhancing machining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inner peripheral surface of the discharge port is formed at an inclination angle with respect to the attachment surfaces, then the routing workability of the refrigerant circuit piping is improved, but the machining procedure becomes complicated and machining error is likely to occur
Solution Approach 1:
Instead of making the discharge port surface inclined with respect to the attachment surfaces (conventional approach), the patent inverts the approach by making the inner peripheral surface of the discharge port orthogonal to the abutment surface and connection end surface, while allowing it to have an inclination angle with respect to the attachment surfaces. This inversion of the reference surface resolves the contradiction by simplifying the machining procedure (reducing machining error) while still achieving the desired routing workability for the refrigerant circuit piping.
2Adaptability or versatility
If multiple machining angles are used for the cover member surfaces, then the layout constraints for compressor attachment are met and piping routing is improved, but the machining procedure becomes complicated and production costs increase
Solution Approach 1:
The patent applies the inversion principle by changing the reference surface for machining from the attachment surfaces to the abutment surface and connection end surface. By making the inner peripheral surface of the discharge port orthogonal to these surfaces instead of inclined with respect to attachment surfaces, the machining procedure is simplified while still meeting the layout constraints and achieving proper piping routing workability.
3Manufacturing precision
If the inner peripheral surface of the discharge port is made orthogonal to the abutment surface and connection end surface, then the machining procedure is simplified and machining error is suppressed, but the routing workability of the refrigerant circuit piping must be maintained through the inclination angle with respect to attachment surfaces
Solution Approach 1:
The patent successfully resolves this contradiction by inverting the reference system. The inner peripheral surface of the discharge port is made orthogonal to the abutment surface and connection end surface (simplifying machining), while simultaneously having an inclination angle with respect to the attachment surfaces (maintaining piping routing workability). This dual relationship achieved through inversion satisfies both requirements.
Data Source
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AI summary
An object of the invention is reducing production costs of housings and compressors. A compressor (100) includes: a housing (102, 104) having an attachment surface (210) for an attached member; a cylindrical protrusion wall (101b) protruding from an outer peripheral surface (101f) of the housing and includes a communication path (144) opened for a working fluid; a cover member (106) including an abutment surface (106d) on which the protrusion wall abuts, a connection end surface (106c) to which piping of an external circuit for the working fluid is connected, and a connection port (106a) penetrating through the connection end surface; and a muffler chamber (143) defined by the outer peripheral surface, the protrusion wall, and the cover member. An inner peripheral surface (211) of the connection port includes a predetermined inclination angle (β) with respect to the attachment surface, and is orthogonal to the abutment surface and connection end surface.