Cementing Equipment Lubrication System Independent Control
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Solution Overview
Problem
Existing electric grease lubrication systems for cementing equipment cannot control the lubrication of the centrifugal pump and high pressure plunger pump packings independently, leading to waste and insufficient lubrication issues.
Innovation Solution
The cementing equipment employs a lubrication system with a lubricating oil pump, first and second pump heads, and distribution valves to provide independent control over lubricating oil delivery to the packings of the centrifugal and plunger pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electric grease lubrication system is used to lubricate both the centrifugal pump and high pressure plunger pump packings, then the device complexity is reduced, but the reliability of independent lubrication control is compromised
Solution Approach 1:
The lubrication system is segmented into two independent lubrication channels: a first lubrication channel with a first pump head for the centrifugal pump, and a second lubrication channel with a second pump head for the high pressure plunger pump. Each channel can be independently controlled based on the operational status of its corresponding pump, eliminating the reliability issue of the single unified system while maintaining reasonable complexity through modular design.
2Device complexity
If the electric grease lubrication system is controlled by detecting the displacement of the high pressure plunger pump only, then the control system is simplified, but the productivity of lubrication control is reduced due to inability to respond to centrifugal pump operation status
Solution Approach 1:
The control system incorporates feedback mechanisms from both pumps: the displacement output of the high pressure plunger pump and the rotational speed of the centrifugal pump. The controller receives signals from both sources and independently activates the first or second pump head based on which pump is operating, achieving responsive and accurate lubrication control without excessive complexity.
3Reliability
If lubricating grease is continuously supplied to both packings regardless of pump operation status, then the reliability of lubrication is improved, but the loss of substance increases due to grease waste
Solution Approach 1:
The lubrication system transitions from static continuous supply to dynamic conditional supply. The first pump head operates dynamically based on centrifugal pump rotational speed, and the second pump head operates dynamically based on high pressure plunger pump displacement. This dynamic control ensures lubrication reliability when needed while preventing grease waste when pumps are not operating.
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 solution ensures that lubricating oil is not wasted and that the packings of both pumps are adequately lubricated, extending their service life and reducing friction and heat generation.
Implementation Method 1
in order to reduce the frictions and take away the heat, lubrication needs to be provided for sealing the packing of the plunger pump and the centrifugal pump
Data Source
AI summary
A cementing equipment and a control method. The cementing equipment includes a centrifugal pump, a plunger pump, and a lubrication system. The lubrication system includes: a lubricating oil pump, including a first lubricating oil outlet and a second lubricating oil outlet; a first distribution valve, including a first inlet, at least one first outlet, and a third outlet, where the first outlet is communicated with a packing lubricating end of the centrifugal pump, the first lubricating oil outlet is communicated with the first inlet; and a second distribution valve, including a second inlet and at least one second outlet, where the second outlet is communicated with a packing lubricating end of the plunger pump, the second lubricating oil outlet is communicated with the second inlet or the second lubricating oil outlet is communicated with the first inlet, and the second inlet is communicated with the third outlet.