Variable-Speed Integrated Machine for Well-Site Fracturing
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Solution Overview
Problem
Existing electric-driven fracturing apparatuses require large and heavy frequency converters for speed regulation, occupying significant space and weight, and are cumbersome for transportation and operation due to the need for multiple connecting cables between the electric motor and the frequency converter.
Innovation Solution
A variable-speed integrated machine is developed, integrating the electric motor and inverter as a single unit without a rectifying unit, allowing for speed regulation and driving while reducing space and weight. This machine includes a driving device with an electric motor and housing, an inversion device connected to the motor, and heat dissipating devices for both the driving and inversion components, all strategically positioned to minimize space and enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frequency converter is used for speed regulation of the electric motor, then speed control capability is improved, but the device occupies large space and has significant weight
Solution Approach 1:
The patent merges the frequency converter and electric motor into an integrated unit, where the frequency converter is mounted directly on the motor housing. This integration eliminates the need for separate frequency converter installation, reducing overall space occupation and weight while maintaining speed control capability through the inverter device.
2Adaptability or versatility
If multiple connecting cables are used between electric motor and frequency converter, then speed regulation function is achieved, but the system becomes cumbersome for transportation and operation
Solution Approach 1:
By integrating the frequency converter with the electric motor housing, the patent reduces the number of connecting cables required. The inverter device is electrically connected to the motor through integrated wiring within the housing, simplifying the connection system and making the overall apparatus easier to transport and operate while retaining speed regulation functionality.
3Power
If high-power electric motor and inverter are used, then driving capability is improved, but heat generation increases requiring effective heat dissipation
Solution Approach 1:
The patent utilizes the heat generated by the high-power electric motor and inverter for a beneficial purpose. A heat exchanger is integrated into the system to recover waste heat from the motor and inverter, converting it into useful thermal energy that can be used for heating applications or preheating fluids, thereby reducing overall energy consumption and improving system efficiency.
Solution Approach 2:
The patent introduces a heat exchanger as an intermediary component between the heat-generating elements (motor and inverter) and the external environment or other system components. This heat exchanger efficiently transfers heat from the motor and inverter to where it is needed, managing thermal loads and preventing overheating while maintaining optimal operating temperatures.
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 variable-speed integrated machine effectively reduces the space and weight requirements, making it easier to transport and install, while ensuring continuous operation within a normal temperature range by efficiently dissipating heat generated by the high-power electric motor and inverter.
Implementation Method 1
an inversion heat dissipating device, disposed at one side of the inversion device away from the housing and configured to perform heat dissipation on the inversion device in a liquid-cooling heat dissipating way
Implementation Method 2
a driving heat dissipating device, at least one portion of the driving heat dissipating device is disposed on the housing and configured to perform heat dissipation on the driving device in at least one selected from the group of a liquid-cooling heat dissipating way and an air-cooling heat dissipating way
Implementation Method 3
a driving heat dissipating device, at least one portion of the driving heat dissipating device is disposed on the housing and configured to perform heat dissipation on the driving device in at least one selected from the group of a liquid-cooling heat dissipating way and an air-cooling heat dissipating way
Data Source
AI summary
A variable-speed integrated machine and a wellsite apparatus are disclosed. The variable-speed integrated machine includes: a driving device which includes an electric motor and a housing; an inversion device which is disposed on the housing and electrically connected with the electric motor; an inversion heat dissipating device which is disposed at one side of the inversion device away from the housing and configured to perform heat dissipation on the inversion device in a liquid-cooling heat dissipating way; and a driving heat dissipating device, at least one portion of the driving heat dissipating device being disposed on the housing and configured to perform heat dissipation on the driving device in at least one selected from the group of a liquid-cooling heat dissipating way and an air-cooling heat dissipating way, the inversion device and at least one portion of the driving heat dissipating device are disposed on a same side of the housing.