Diaphragm Pump Eccentric Wheel Speed Detection
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Solution Overview
Problem
The complexity and manufacturing difficulties of diaphragm pumps with integrated photoelectric shielding sheets on eccentric wheels lead to structural instability and increased noise during high-speed rotation.
Innovation Solution
A diaphragm pump design where the photoelectric shielding sheet is separately provided to the eccentric wheel, allowing it to rotate synchronously with the electric motor shaft, and a photoelectric sensor on the base seat detects the rotational speed, sending signals to an electric motor controller for adjustment, thereby improving stability and reducing noise and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the photoelectric shielding sheet is integrally formed on the eccentric wheel or electric motor shaft, then the structure can detect rotational speed, but the structure becomes excessively complicated and difficult to manufacture
Solution Approach 1:
The photoelectric shielding sheet is separated from the eccentric wheel into an independent component. This segmentation allows the shielding sheet to be manufactured separately and then assembled to the eccentric wheel, simplifying both the manufacturing process and the overall structure while maintaining the rotational speed detection function through the photoelectric sensor system.
Solution Approach 2:
The photoelectric shielding sheet is extracted from the integrated structure and positioned as a separate component that can be detachably connected to the eccentric wheel. This extraction eliminates the complexity of integral formation while preserving the functional relationship between the shielding sheet, eccentric wheel, and photoelectric sensor for rotational speed detection.
2Reliability
If the photoelectric shielding sheet is integrally formed on the eccentric wheel, then rotational speed detection is enabled, but the eccentric wheel experiences uneven stress and fluttering during high-speed rotation
Solution Approach 1:
By separating the photoelectric shielding sheet from the eccentric wheel, the patent eliminates the stress concentration and uneven loading that would occur in an integral structure during high-speed rotation. The shielding sheet is now a lightweight, detachable component that does not compromise the structural integrity or balance of the eccentric wheel, preventing fluttering phenomena.
Solution Approach 2:
Extracting the photoelectric shielding sheet from the eccentric wheel structure removes the source of uneven stress distribution. The shielding sheet can be lightly attached without adding significant mass or creating stress concentration points, thereby maintaining the eccentric wheel's structural stability during high-speed operation.
3Ease of manufacture
If the photoelectric shielding sheet is integrally formed, then the structure is complete, but the production cost increases
Solution Approach 1:
Segmenting the photoelectric shielding sheet as a separate component enables independent manufacturing and assembly, reducing overall production costs. The shielding sheet can be produced using simpler, more cost-effective methods and then attached to the eccentric wheel, avoiding the high costs associated with integral formation processes.
Solution Approach 2:
By extracting the photoelectric shielding sheet from the integrated structure, the patent simplifies the manufacturing process and reduces production costs. The separate shielding sheet can be manufactured independently with lower material and processing costs, and the simplified assembly process further reduces overall production expenses.
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 separate placement of the photoelectric shielding sheet simplifies manufacturing, enhances the stability of the eccentric wheel, and reduces noise and production costs while enabling precise control over the rotational speed.
Implementation Method 1
a photoelectric sensor provided to the base seat and cooperating with the photoelectric shielding sheet so as to detect a rotational speed of the electric motor shaft
Data Source
AI summary
A diaphragm pump includes a driving assembly, a pump body, a connecting rod assembly, a photoelectric shielding sheet, and a photoelectric sensor. The driving assembly includes a base seat and an electric motor provided to the base seat. The pump body is connected to the base seat to define a chamber. The connecting rod assembly is disposed in the chamber and includes an eccentric wheel connected with an electric motor shaft of the electric motor. The photoelectric shielding sheet is separately provided to the eccentric wheel and rotates synchronously with the eccentric wheel and the electric motor shaft. The photoelectric sensor is provided to the base seat and cooperates with the photoelectric shielding sheet to detect a rotational speed of the electric motor shaft and send a signal to a motor controller. The motor controller adjusts the rotational speed of the electric motor shaft according to the signal.