Compressor having intermediate passage capable of conveying accumulated oil to a second compression part and air conditioner including same

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Solution Overview

Problem

The efficiency of discharging accumulated oil from the intermediate cavity in two-stage enthalpy adding compressors is low, leading to unstable motor torque, increased current, and potential compressor shutdown due to oil squeezing phenomena, which affects the reliability of the compressor.

Innovation Solution

The compressor design includes an intermediate passage with a bottom port located at the bottom of the intermediate cavity, allowing refrigerant or air supplement refrigerant to convey accumulated oil to the second compression part, enhancing the discharge efficiency and allowing for easy maintenance or replacement of the intermediate passage if needed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the intermediate passage outlet is arranged on the top of the intermediate cavity, then the structure is simple, but the efficiency of discharging accumulated oil is low

Engineering Contradiction:

Improvestructural simplicityVSAvoidoil discharge efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent inverts the conventional arrangement by placing the intermediate passage outlet at the bottom of the intermediate cavity instead of on the top. This inversion allows the refrigerant discharged from the first compression part to directly contact and carry the accumulated oil at the bottom, significantly improving oil discharge efficiency while maintaining structural simplicity.

Inventive Principle:

Principle #13The other way round (Inversion)

2Stability of the object's composition

If the intermediate cavity accumulates oil, then the refrigerant can be buffered, but the motor torque becomes unstable and current increases

Engineering Contradiction:

Improverefrigerant bufferingVSAvoidmotor torque stability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent extracts the harmful accumulated oil from the intermediate cavity by providing a dedicated discharge path through the bottom outlet. The refrigerant discharged from the first compression part carries the oil through the intermediate passage to the second compression part, removing the oil that would otherwise cause motor torque instability and excessive current.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If the second compression part inhales excessive accumulated oil instantaneously, then the intermediate cavity can be emptied, but oil squeezing phenomenon occurs and reliability decreases

Engineering Contradiction:

Improveoil discharge speedVSAvoidcompressor reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements preliminary action by continuously carrying oil from the intermediate cavity to the second compression part through the intermediate passage during normal operation. This prevents sudden instantaneous inhalation of large amounts of oil, avoiding oil squeezing phenomenon and maintaining compressor reliability while ensuring steady oil discharge.

Inventive Principle:

Principle #10Preliminary action

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 design significantly improves the speed and efficiency of discharging accumulated oil, preventing oil squeezing and ensuring stable compressor operation, reducing the risk of mechanical failure and enhancing reliability.

Implementation Method 1

use air supplement refrigerant and the refrigerant discharged from the first compression part to convey accumulated oil in the intermediate cavity to the inner cavity of the second compression part

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

only air supplement refrigerant is used to convey accumulated oil in the intermediate cavity to the inner cavity of the second compression part

Methodology Applied

Scientific EffectFluid flow:

Data Source

PatentUS11614087B2Compressor having intermediate passage capable of conveying accumulated oil to a second compression part and air conditioner including same

Publication Date: 2023.03.28 ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION

AI summary

Some embodiments of the present disclosure provide a compressor and an air conditioner with the compressor. The compressor includes: a first compression part, a second compression part, an intermediate cavity and an intermediate passage. Refrigerant discharged from the first compression part enters the intermediate cavity. The intermediate passage communicates with the intermediate cavity and an inner cavity of the second compression part. A bottom port of the intermediate passage is located at a bottom of the intermediate cavity, and air supplement refrigerant and/or the refrigerant discharged from the first compression part are used to convey accumulated oil in the intermediate cavity to the inner cavity of the second compression part. When only the refrigerant is used to convey the accumulated to the inner cavity of the second compression part, at least a part of the intermediate passage is located outside of a housing assembly of the compressor.