Electric Compressor Terminal Guard Mounting via Pin Protrusions
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Solution Overview
Problem
The existing methods for installing a terminal guard on an electric compressor require processing the external surface of the housing into a flat shape, which is time-consuming and labor-intensive, and lack a reliable method for positioning a sealing member, often resulting in incomplete sealing.
Innovation Solution
The electric compressor features pin-like protrusions on the housing that correspond with apertures in the protection member, allowing for easy mounting without altering the curved surface, and a sealing member is positioned using these protrusions to ensure proper alignment and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat sealing surface is formed on the housing through machining or press processing, then sealability between the terminal guard and housing is ensured, but processing time and labor are increased
Solution Approach 1:
A recess is formed in advance on the housing surface where the terminal guard will be mounted. This preliminary structural preparation allows the terminal guard to be directly fitted into the recess without requiring additional flat surface machining or press processing at the time of assembly, thereby ensuring sealability while reducing processing time and labor
Solution Approach 2:
The terminal guard is designed to be nested within a recess formed on the housing surface. This nesting structure allows the terminal guard to be accommodated in the recess while maintaining a sealed interface, eliminating the need for separate flat surface processing and reducing overall manufacturing complexity
2Ease of manufacture
If securing bolts are inserted toward the housing from outside the terminal guard, then the terminal guard can be mounted to the housing, but the bolts penetrate into the interior of the housing
Solution Approach 1:
The mounting structure is segmented into two parts: the terminal guard with through-holes and the housing with corresponding protrusions. The protrusions extend through the housing wall to engage with the terminal guard from the exterior side, allowing secure mounting without bolts penetrating into the housing interior
Solution Approach 2:
Pin-like protrusions act as intermediary elements between the housing and the terminal guard. These protrusions extend from the housing exterior and engage with through-holes in the terminal guard, providing a secure mechanical connection without requiring bolt penetration into the housing interior
3Ease of manufacture
If the sealing member is attached to the terminal guard first and installed together with it, then the terminal guard can be mounted, but the noise insulation member may be sandwiched between the sealing member and housing, leaving the sealing member misaligned
Solution Approach 1:
The pin-like protrusions are prepared in advance on the housing exterior, and their positions and directions are precisely determined before assembly. This preliminary positioning structure guides the terminal guard and sealing member into correct alignment during installation, preventing misalignment and ensuring proper sealing without requiring complex adjustment procedures
Solution Approach 2:
The traditional mechanical fastening system using bolts and washers is replaced with a positioning system based on pin-like protrusions that engage with through-holes. This substitution provides inherent alignment functionality, ensuring the sealing member is correctly positioned relative to the housing without the risk of being misaligned or sandwiched during assembly
Data Source
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AI summary
An object is to provide an electric compressor with which the need to process an external surface of a housing can be eliminated, making it possible to reduce time and labor involved in processing, and with which a protection member can easily be mounted to the external surface of the housing, and to provide a manufacturing method of an electric compressor. An electric compressor (1) comprises: a housing (2) having a curved external surface; an electric terminal (3) provided at the external surface of the housing; pin-like bolts (4a and 4b) that protrude from the external surface of the housing in a normal direction of the external surface; and a terminal guard (5) in which apertures (7a and 7b) that correspond to the positions and protruding directions of the bolts are formed, and that surrounds the electric terminal with the bolts being inserted into the apertures.