Motor-Driven Compressor Integrated Housing Sealing
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Solution Overview
Problem
Existing motor-driven compressors have complex structures for achieving a fluid-tight seal, which complicates the assembly and increases the risk of refrigerant gas leakage.
Innovation Solution
A motor-driven compressor design featuring a housing assembly with three interconnected housings (first, second, and third housings) that form a closed space and accommodation space, using gaskets and bolts for sealing, simplifying the sealing process and reducing the number of components required for a fluid-tight seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a motor drive circuit casing is fastened to the housing by means of bolts to prevent refrigerant gas leakage, then sealing reliability is improved, but device complexity increases due to the need for separate motor drive circuit casing and multiple sealing interfaces
Solution Approach 1:
The motor drive circuit housing is merged with the compressor housing to form an integrated housing structure. The motor drive circuit is mounted directly on the housing without requiring a separate motor drive circuit casing, thereby reducing the number of components and sealing interfaces while maintaining sealing reliability through the integral design.
Solution Approach 2:
The housing serves multiple functions: it encloses the compression mechanism, provides mounting surface for the motor drive circuit, and ensures fluid-tight sealing. The housing structure is designed to accommodate both the compression mechanism and the motor drive circuit while maintaining a single sealed environment, reducing the need for separate casings and multiple sealing interfaces.
2Reliability
If multiple sealing interfaces are created between motor drive circuit casing and housing, then sealing reliability is improved, but ease of manufacture deteriorates due to complicated assembly process
Solution Approach 1:
By integrating the motor drive circuit housing with the compressor housing, the number of sealing interfaces is reduced from multiple (between motor drive circuit casing and housing) to a single integrated sealing structure, thereby simplifying the assembly process and improving ease of manufacture while maintaining sealing reliability.
3Reliability
If a separate motor drive circuit casing is used to prevent refrigerant gas leakage, then reliability is improved, but productivity decreases due to complex assembly process
Solution Approach 1:
The integration of motor drive circuit housing with compressor housing reduces the number of assembly steps by eliminating the separate motor drive circuit casing and its associated sealing operations. This streamlined design improves assembly productivity while maintaining sealing reliability through the integrated housing structure.
Data Source
AI summary
A motor-driven compressor has a compression mechanism, a rotary shaft, an electric motor, a motor drive circuit, a connecting terminal and a housing assembly. The compression mechanism, the electric motor, and the motor drive circuit are disposed along the axial direction of the rotary shaft in the housing assembly having first through third housings. The first housing is used for mounting the electric motor and the compression mechanism. The second housing has a terminal mounting portion for fixing the connecting terminal. The first and second housings have fastening portions at the radially peripheral portion thereof. The third housing is joined to the second housing to form an accommodation space for accommodating the motor drive circuit. The closed casing is formed by fastening the fastening portions of the first and second housings by means of a first bolt and connecting the second housing to the open end of the first housing.