Screw Compressor Intermediate Shaft Speed Increase
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Solution Overview
Problem
Large capacity screw compressors face challenges in achieving a predetermined speed increasing ratio without increasing the diameter of gears, leading to manufacturing difficulties and higher costs due to the need for larger bull gears or reduced motor speed.
Innovation Solution
The implementation of an intermediate shaft with a first and second speed-increasing gear, which meshes with the motor side gear and rotor side gear respectively, allowing for a two-stage increase in rotational power transmission while maintaining a low motor rotating speed and preventing gear diameter increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single-stage speed increasing gear is used to achieve a predetermined speed increasing ratio, then the motor rotational speed can be increased, but the gear diameter must be increased making manufacture difficult and costly
Solution Approach 1:
The single-stage speed increasing gear is divided into two separate speed increasing stages. The first speed increasing gear increases motor speed by a first ratio, and the second speed increasing gear further increases it by a second ratio. This segmentation allows each gear to have a smaller diameter, making them easier and cheaper to manufacture while achieving the same overall speed increase.
Solution Approach 2:
An intermediate shaft is introduced between the motor and the rotor shaft to carry the first speed increasing gear. This intermediate shaft acts as a mediator that enables the two-stage speed increase by providing a mounting point for the first speed increasing gear, allowing the motor speed to be increased in two steps rather than one large jump requiring a large diameter gear.
2Speed
If the bull gear diameter is increased to achieve a predetermined speed increasing ratio, then the motor rotational speed can be increased, but the cost of gears and motor increases
Solution Approach 1:
The speed increasing function is segmented into two separate gear stages mounted on different shafts. Instead of using one large bull gear, the system uses a first speed increasing gear on the intermediate shaft and a second speed increasing gear on the rotor shaft. This reduces the diameter of individual gears and simplifies the overall system configuration.
Solution Approach 2:
The gear arrangement transitions from a single-dimension configuration (one bull gear on the motor shaft) to a two-dimension configuration (gears distributed on two different shafts). The intermediate shaft and rotor shaft are arranged at specific spatial relationships, allowing the speed increase to be achieved through spatial distribution rather than a single large component.
Data Source
AI summary
A screw compressor comprising: a low pressure stage compressor body; a high pressure stage compressor body that further compresses a compressed air compressed by the low pressure stage compressor body; pinion gears for example, respectively, provided on, for example, a male rotor of the low pressure stage compressor body and, for example, a male rotor of the high pressure stage compressor body; a motor; a bull gear for example, provided on a rotating shaft of the motor; and an intermediate shaft supported rotatably and provided with a pinion gear, which meshes with the bull gear, and a bull gear, which meshes with the pinion gears. Thereby, it is possible to make the motor relatively low in rotating speed while inhibiting the gears from being increased in diameter, thus enabling achieving reduction in cost.