Rotary Compressor Valve Seat Structure for Backflow and Impact Relief

Solution Overview

Problem

The existing rotary compressors face issues with valve body breakage due to high-speed and high-frequency collisions with valve seats, leading to stress concentration and potential cracking or fatigue-breaking, which affects the backflow suppression mechanism's efficiency and reliability.

Innovation Solution

The rotary compressor incorporates a valve body with annular non-contact regions on its surfaces, which distribute collision energy and reduce stress concentration by allowing portions of the valve body to deform without contacting the valve seats, thereby preventing breakage and ensuring reliable backflow suppression.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the valve body is designed to fully contact the valve seat for effective backflow suppression, then the backflow suppression efficiency is improved, but the valve body is prone to stress concentration and breakage due to high-speed collisions

Engineering Contradiction:

Improvebackflow suppression efficiencyVSAvoidvalve body strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The valve body is designed with differentiated contact characteristics: a contact portion that contacts the valve seat for backflow suppression, and non-contact portions that do not contact the valve seat to avoid stress concentration. This local differentiation allows the valve body to maintain sealing effectiveness while reducing collision damage.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The valve body surface is segmented into multiple regions: contact portions for sealing and non-contact portions for stress relief. This segmentation allows different parts of the valve body to serve different functions - sealing where needed and avoiding collision where not needed.

Inventive Principle:

Principle #1Segmentation

2Speed

If the valve body reciprocates at high speed for effective backflow suppression, then the backflow suppression response is improved, but the valve body experiences high-frequency collisions leading to fatigue breakage

Engineering Contradiction:

Improvevalve body reciprocation speedVSAvoidvalve body durability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The valve body is designed with differentiated contact characteristics: a contact portion that contacts the valve seat for backflow suppression, and non-contact portions that do not contact the valve seat to avoid stress concentration. This local differentiation allows the valve body to maintain sealing effectiveness while reducing collision damage.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The design accepts that high-speed reciprocation is necessary for backflow suppression but converts the harmful effect of full-contact collisions into a beneficial partial-contact system. The non-contact portions allow controlled deformation that absorbs collision energy, turning what would be damaging full-contact collisions into less severe partial-contact events.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Ease of manufacture

If the valve body is designed with a simple circular annular shape, then the manufacturing is simplified, but the collision energy is concentrated causing breakage

Engineering Contradiction:

Improvevalve body manufacturing simplicityVSAvoidvalve body resistance to collision

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The valve body is designed with differentiated contact characteristics: a contact portion that contacts the valve seat for backflow suppression, and non-contact portions that do not contact the valve seat to avoid stress concentration. This local differentiation allows the valve body to maintain sealing effectiveness while reducing collision damage.

Inventive Principle:

Principle #3Local quality

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 design effectively disperses collision energy and reduces stress on the valve body, preventing breakage and ensuring reliable backflow suppression, thus maintaining compression efficiency and compressor reliability.

Implementation Method 1

The valve body moves between the holding member and the valve seating surface in accordance with a differential pressure between the internal pressure of the compression chamber and the internal pressure of the injection path

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Implementation Method 2

an annular first non-contact region that is formed in a predetermined range extending radially inward from an outer edge of the valve body and that does not come into contact with a corresponding valve seat

Methodology Applied

Scientific EffectDeformation: Deformation

Data Source

PatentUS11906060B2Rotary compressor with backflow suppresion mechanism for an introduction path

Publication Date: 2024.02.20 DAIKIN INDUSTRIES LTD

AI summary

A rotary compressor includes a drive mechanism, a compression mechanism, an introduction path to introduce a fluid into a compression chamber of the compression mechanism, and a backflow suppression mechanism. At least one of a first surface and a second surface of a valve body includes an annular first non-contact region that is formed in a predetermined range extending radially inward from an outer edge of the valve body and that does not come into contact with a corresponding valve seat, an annular second non-contact region that is formed in a predetermined range extending radially outward from the hole of the valve body and that does not come into contact with a corresponding valve seat, and a contact region that is formed between the first non-contact region and the second non-contact region and that comes into contact with a corresponding valve seat.