Scroll Compressor Press-Fitted Stator Cooling
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Solution Overview
Problem
Conventional scroll compressors face increased manufacturing costs due to complex assembly and high cooling requirements for the electric motor, which complicates the assembly and raises costs.
Innovation Solution
The electric motor's stator stack is press-fitted into the mid shell, with the suction inlet positioned to direct refrigerant flow along the stator windings for effective cooling, eliminating the need for additional securing parts and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor is arranged within an inner shell secured to a support frame, then the electric motor is securely mounted, but the assembly complexity increases and manufacturing cost increases
Solution Approach 1:
The patent merges the motor mounting function directly into the mid shell by press-fitting the stator stack into the mid shell itself. This eliminates the need for separate inner shells and support frames, thereby securing the motor while reducing assembly complexity and manufacturing cost.
2Temperature
If specific flow passages are provided on the inner shell to cool the stator end windings, then the cooling effectiveness is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the cooling function with the motor mounting structure by integrating flow passages directly into the mid shell where the stator stack is press-fitted. This eliminates the need for separate inner shells with cooling passages, achieving effective cooling of the stator end windings while reducing manufacturing cost.
3Stability of the object's composition
If support elements are provided to support the lower end of the drive shaft, then the structural stability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent integrates the drive shaft support function directly into the mid shell structure. The mid shell itself provides support for the lower end of the drive shaft, eliminating the need for separate support elements and reducing manufacturing cost while maintaining structural stability.
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 configuration reduces manufacturing costs, enhances cooling efficiency of the electric motor, improves gas flow passages, and increases compressor reliability by preventing liquid passage to the compression unit.
Implementation Method 1
at least a first part of a refrigerant flow, entering the scroll compressor through the suction inlet, flows along the stator stack towards a first stator end winding of the stator and through said first stator end winding
Implementation Method 2
ensures an effective cooling of the electric motor and particularly of first and second stator end windings of a stator of the electric motor
Implementation Method 3
the stator stack is press-fitted in the mid shell
Data Source
AI summary
The scroll compressor (2) includes a hermetic casing (3) comprising a mid shell (4) provided with a suction inlet (7); a compression unit (11) arranged within the hermetic casing (3); a drive shaft (27) configured to drive an orbiting scroll (13) of the compression unit (11); an electric motor (21) coupled to the drive shaft (27) and configured to drive in rotation the drive shaft (27) about its rotational axis, the electric motor (21) including a rotor (22) and a stator (23) which includes a stator stack (24), wherein the stator stack (24) is press-fitted in the mid shell (4), the suction inlet (7) is facing the stator stack (24), and the compression unit (11) includes a single suction opening (34) arranged at an opposite position in relation to the suction inlet (7).