Screw Oil Pump for Scroll Compressor Low-Speed Feeding
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Solution Overview
Problem
Existing oil pumps in compressors face issues such as complex structures, high manufacturing costs, and decreased oil pumping efficiency due to wear over time, as well as poor performance at low speeds.
Innovation Solution
A scroll compressor equipped with a screw oil pump driven by an electric motor, featuring a shaft with a spirally rising thread for oil feeding, and a cylindrical accommodating piece with a gap to reduce wear and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a gear oil pump is used, then the oil pumping ability is good, but the structure becomes complex and manufacturing cost increases
Solution Approach 1:
The patent extracts the oil pumping function from the complex gear mechanism and implements it through a simple screw pump structure. The screw pump comprises a screw element and a pump housing with a spiral groove, eliminating the need for complex gear components while maintaining effective oil pumping capability.
Solution Approach 2:
The patent replaces the traditional gear-based mechanical pumping system with a screw-based pumping mechanism. The screw element rotating within the spiral groove creates a positive displacement pump that is simpler in structure and easier to manufacture, yet achieves comparable or superior oil pumping performance.
2Productivity
If a gear oil pump is used, then the oil pumping ability is good, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the oil pumping function from the complex gear mechanism and implements it through a simple screw pump structure. The screw pump comprises a screw element and a pump housing with a spiral groove, eliminating the need for complex gear components while maintaining effective oil pumping capability.
Solution Approach 2:
The patent replaces the traditional gear-based mechanical pumping system with a screw-based pumping mechanism. The screw element rotating within the spiral groove creates a positive displacement pump that is simpler in structure and easier to manufacture, yet achieves comparable or superior oil pumping performance.
3Device complexity
If a centrifugal pump is used, then the structure is simple and reliability is good, but the oil pumping ability is poor at low speeds
Solution Approach 1:
The patent employs a screw element that rotates dynamically within the spiral groove, creating a positive displacement pump. This dynamic mechanism ensures that oil is pumped effectively at all speeds, including low speeds, because the pumping action is based on the rotational displacement of the screw rather than centrifugal force which diminishes at low speeds.
Solution Approach 2:
The patent replaces the centrifugal pump mechanism with a screw-based positive displacement pump. The screw element rotating within the spiral groove creates a pumping action that is independent of rotational speed, maintaining effective oil pumping capability from startup through high-speed operation.
4Reliability
If a centrifugal pump is used, then the structure is simple and reliability is good, but the oil pumping ability is poor when running at low speeds
Solution Approach 1:
The patent employs a screw element that rotates dynamically within the spiral groove, creating a positive displacement pump. This dynamic mechanism ensures that oil is pumped effectively at all speeds, including low speeds, because the pumping action is based on the rotational displacement of the screw rather than centrifugal force which diminishes at low speeds.
Solution Approach 2:
The patent replaces the centrifugal pump mechanism with a screw-based positive displacement pump. The screw element rotating within the spiral groove creates a pumping action that is independent of rotational speed, maintaining effective oil pumping capability from startup through high-speed operation.
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 screw oil pump provides efficient and reliable oil feeding, maintaining performance across varying speeds and extending the service life of the compressor, while reducing oil costs.
Implementation Method 1
a feeding piece, which is provided with a spirally rising thread... such that oil is fed along the thread into the first channel when the feeding piece and the accommodating piece rotate relatively to each other
Data Source
AI summary
A scroll compressor (1000), includes a housing (1200); a first scroll plate (1300) fixed to the housing (1200), the first scroll plate (1300) including a first end plate (1310) and a first scroll wrap (1320); a second scroll plate (1400), the second scroll plate (1400) including a second end plate (1410) and a second scroll wrap (1420), the first scroll wrap (1320) extending from the first end plate (1310) toward the second end plate (1410) and the second scroll wrap (1420) extending from the second end plate (1410) toward the first end plate (1310) such that the second scroll wrap (1420) and the first scroll wrap (1310) fit with each other to form a compression cavity for a compression medium; an electric motor (80); and a screw oil pump (100) driven by the motor (80), wherein the top end of the screw oil pump (100) fits with the second scroll plate (1400) and the lower end of the screw oil pump (100) extends into an oil bath located at the bottom of the housing (1200).