Dual-Input Speed Regulation for Constant-Speed Plunger Pumps
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Solution Overview
Problem
Existing plunger pumps for fracturing devices are limited by the use of double-shaft turbine engines, which restrict power source choices and lack a speed regulating function, making them incompatible with single-shaft turbine engines and other power sources with constant rotation speeds.
Innovation Solution
A speed regulating apparatus with a first and second speed regulating mechanism, incorporating a main and auxiliary power input component, allows for variable speed regulation by switching between single and dual-power driving modes, enabling adaptation to single-shaft turbine engines and other power sources with constant rotation speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a constant reduction ratio reducer is used in the plunger pump, then the structure is simple, but the speed regulating function cannot be implemented and power source choices are restricted
Solution Approach 1:
The transmission system is divided into two independent power input paths: a main power input component (planetary gear set) and an auxiliary power input component (gear set). Each component can operate independently or work together, allowing the system to adapt to different power sources while maintaining manageable complexity through modular design
Solution Approach 2:
The transmission system is designed with dual power input capabilities that can accommodate both constant speed power sources (single-shaft turbine engines) and variable speed power sources (double-shaft turbine engines, diesel engines, motors). The system universally supports multiple power source types through its configurable dual-input architecture
2Ease of operation
If a single-shaft turbine engine is used as power source, then the structure is simpler and fuel cost is reduced, but the rotation speed cannot be regulated
Solution Approach 1:
The transmission system acts as an intermediary between the single-shaft turbine engine and the plunger pump. It converts the constant rotation speed output of the single-shaft turbine engine into variable speed operation of the plunger pump through the coordinated operation of the main and auxiliary power input components, thereby enabling speed regulation without modifying the simple single-shaft engine structure
Solution Approach 2:
The system transitions from a static constant reduction ratio to a dynamic variable reduction ratio through the differential engagement of the main planetary gear set and auxiliary gear set. The variable reduction ratio changes dynamically based on the operational requirements and the rotation speeds of the two power inputs, enabling flexible speed control
3Adaptability or versatility
If a variable reduction ratio transmission system is implemented, then speed regulation is achieved, but the device complexity increases
Solution Approach 1:
The main planetary gear set and auxiliary gear set are merged into a single integrated transmission system with shared components and coordinated power flow. The two power input components work together through the common output shaft and connecting mechanisms, achieving variable speed regulation while avoiding the complexity of completely separate transmission systems
Solution Approach 2:
The auxiliary gear set is nested within or integrated with the main planetary gear set structure. The smaller auxiliary gear components are positioned within the larger planetary gear assembly, allowing both transmission systems to occupy compact space and share common mounting structures, thereby reducing overall system complexity
Data Source
AI summary
This application provides a speed regulating apparatus includes: a casing and a first speed regulating mechanism disposed in the casing. The first speed regulating mechanism includes a main power input component, an auxiliary power input component, and a speed regulating gear. The main power input component is a planetary gear set and includes a first input shaft, a first output shaft, and a plurality of first planetary gears. The first input shaft is configured to receive a driving force. The first output shaft is configured to output the driving force. The speed regulating gear is rotatably connected to the casing, and is in transmission connection with the plurality of first planetary gears separately. The auxiliary power input component includes an auxiliary power input gear rotatably connected to the casing, and the auxiliary power input gear is in transmission connection with the speed regulating gear.