Scroll Compressor Floating Plate Coating Hardness Gradient
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Solution Overview
Problem
The existing scroll compressor designs with back pressure discharge units face issues of premature wear and leakage due to continuous contact between the floating plate's sealing end and the discharge cover, leading to abnormal operation and increased re-operation time.
Innovation Solution
A scroll compressor design featuring a floating plate with a coating layer having a specific hardness value and an impact absorption layer on the discharge cover, which reduces wear and prevents communication between suction and discharge spaces by absorbing impacts and maintaining the sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the floating plate continuously contacts the discharge cover to seal the back pressure chamber, then the sealing effect is improved, but the wear of the contact surfaces increases leading to leakage
Solution Approach 1:
The patent changes the physical parameter of hardness by applying a coating layer with intermediate hardness between the floating plate and discharge cover. This creates a hardness gradient that reduces wear while maintaining sealing contact, directly resolving the contradiction between sealing reliability and component durability
Solution Approach 2:
The patent uses composite material structure by combining the base material of the floating plate with a coating layer of different material properties. This composite structure provides both the sealing capability of the contact surface and the wear resistance of the coating, simultaneously achieving reliable sealing and extended service life
2Loss of time
If the floating plate is quickly spaced from the discharge cover to reduce equilibrium pressure reaching time, then the re-operation time is reduced, but the sealing effect deteriorates causing refrigerant leakage
Solution Approach 1:
The coating layer modifies the friction and contact parameters between the floating plate and discharge cover, allowing for optimized contact duration that maintains sealing while enabling faster re-operation. The intermediate hardness provides controlled slip characteristics that balance sealing reliability with quick restart capability
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
The proposed design effectively reduces abrasion and prevents leakage, ensuring reliable operation and quicker re-start times by minimizing wear between the floating plate and discharge cover, thus enhancing the compressor's performance and longevity.
Implementation Method 1
an impact absorption layer disposed on a portion of the discharge cover facing the contact part
Data Source
AI summary
The scroll compressor includes a casing comprising a rotation shaft; a discharge cover fixed inside the casing to partition the inside of the casing into a suction space and a discharge space; a back pressure plate defining a back pressure chamber for accommodating a refrigerant, a floating plate to define the back pressure chamber together with the back pressure plate, the floating plate including a contact part that is capable of contacting the discharge cover, and a coating layer defining an outer surface of the contact part. The discharge cover has a first hardness value, the floating plate has a second hardness value, and the coating layer has a third hardness value, and the third hardness value is less than the first hardness value and greater than the second hardness value.