Screw Compressor Oil Level Detection via Segmented Chamber
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Solution Overview
Problem
In screw compressors with horizontally disposed rotor shafts, accurate oil level detection and maintenance are challenging due to oil splashing and variations in the oil level within the bearing casing, making it difficult to prevent oil shortages and ensure proper lubrication.
Innovation Solution
A screw compressor design featuring a separate chamber with an oil line for communication between the bearing casing and the chamber, allowing for accurate oil level detection and control, with an oil supply line for replenishment and an oil discharge line for excess oil, along with an oil temperature sensor for viscosity management, ensuring consistent lubrication and preventing damage from oil level or temperature issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If oil level detecting means is mounted within the bearing casing, then oil level can be detected, but the detection accuracy deteriorates due to oil splashing and level variations caused by timing gears
Solution Approach 1:
The bearing casing is divided into two separate parts: the main bearing casing containing the timing gears and oil sump, and a separate detection chamber housing the oil level detecting means. These are connected via an oil line, allowing the detection chamber to be isolated from the harmful oil splashing environment while still monitoring the oil level in the bearing casing through hydraulic communication.
Solution Approach 2:
An oil line serves as an intermediary element connecting the bearing casing and the detection chamber. This oil line transmits the oil level information from the bearing casing to the separate detection chamber, enabling accurate measurement without exposing the detecting means to the harmful conditions of direct mounting within the bearing casing.
2Reliability
If oil level detecting means is mounted within the bearing casing, then oil level can be monitored, but the device complexity increases due to the need for sealed mounting and protection against oil splashing
Solution Approach 1:
The monitoring system is segmented into two independent units: the bearing casing with its oil sump and timing gears, and a separate detection chamber with the oil level detecting means. This segmentation eliminates the need for complex sealed mounting structures and protection mechanisms that would be required if the detecting means were mounted directly within the bearing casing.
Solution Approach 2:
The oil line acts as a simple intermediary connection that requires no complex sealing or protection mechanisms. It allows the detection chamber to be mounted separately while maintaining hydraulic communication with the bearing casing, significantly reducing the overall device complexity compared to direct mounting approaches.
3Reliability
If oil bath method is used for lubrication, then bearings are properly lubricated, but accurate oil level confirmation becomes difficult due to the unique external shape of the bearing casing
Solution Approach 1:
The oil line serves as an intermediary that extends the oil level information to a separately mounted detection chamber. This allows the oil level to be visually checked at a convenient location on the compressor exterior, independent of the bearing casing's unique shape, while the bearing casing maintains its optimal design for lubrication purposes.
Solution Approach 2:
The oil level detection function is moved from the internal three-dimensional space of the bearing casing to an external detection chamber mounted on the compressor body. This dimensional relocation allows for easy visual access and monitoring without being constrained by the internal geometry and unique external shape of the bearing casing.
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 enables precise oil level detection and maintenance, preventing oil shortages and damage to bearings by ensuring the oil level remains within optimal limits, while managing oil temperature to maintain viscosity and prevent excessive oil accumulation.
Implementation Method 1
an oil line for communication between the oil sump and the chamber
Data Source
AI summary
A screw compressor is disclosed wherein a pair of rotor shafts are disposed horizontally and an oil sump is formed at the bottom of a bearing casing which accommodates bearings for supporting the rotor shafts, a bearing lower portion being soaked into oil present in the oil sump for lubrication. The screw compressor comprises a chamber provided separately from the bearing casing, an oil line for communication between the oil sump in the bearing casing and the chamber and oil level detecting means disposed in the chamber. According to this structure, the oil level in the bearing casing can be checked accurately and there is no fear of oil shortage in the bearings.