Gearbox Diaphragm Pump Torque Distribution
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Solution Overview
Problem
Medical suction pumps, such as breast pumps and drainage pumps, require powerful motors, making them bulky, heavy, and noisy, which is a disadvantage for portable designs.
Innovation Solution
A membrane vacuum pump design that uses a gearbox to convert rotational movement into a cyclic, approximately linear movement of the vacuum membrane, distributing torque over a larger angular range to reduce load peaks, allowing for smaller, less powerful motors and quieter operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a powerful motor is used to deliver sufficient power for medical suction pumps, then the power output is improved, but the weight and size of the pump increase
Solution Approach 1:
The patent changes the temporal distribution of motor operation parameters by extending the duration over which the motor delivers torque. The motor operates over more than 180° of rotation (extending beyond the traditional 180° stroke), distributing the required work over a longer angular range. This reduces peak torque requirements while maintaining sufficient average power output, enabling the use of smaller, lighter motors.
2Power
If a powerful motor is used to deliver sufficient power for medical suction pumps, then the power output is improved, but the noise level increases
Solution Approach 1:
By extending the motor operation angle beyond 180°, the patent reduces peak torque demands and smooths the torque curve. This parameter change allows the motor to operate more quietly throughout the extended rotation range, reducing noise generation while maintaining necessary power output for effective suction.
3Device complexity
If a traditional 180° motor rotation mechanism is used, then the device complexity is reduced, but the load torque exhibits large peaks
Solution Approach 1:
The patent modifies the operational parameter of motor rotation angle from the traditional 180° to more than 180°. This simple parameter change redistributes the torque load over the extended angular range, significantly reducing peak torque values without requiring complex additional mechanisms or components.
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 design results in a compact, lightweight, low-noise, and cost-effective membrane vacuum pump suitable for portable medical suction units, with reduced pulsation of the pumped medium and increased efficiency.
Implementation Method 1
a gearbox, which converts a rotational movement of the motor shaft into a cyclic, approximately linear forward and backward movement of the connecting element
Implementation Method 2
a vacuum diaphragm for generating a vacuum in the pump chamber
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a diaphragm vacuum pump comprising a pump chamber (3), a vacuum diaphragm (4) for generating a vacuum in the pump chamber (3), an electric motor (1) having a motor shaft (10), a transmission (6, 7, 8) and a connection element (5, 80). The transmission (6, 7, 8) converts a rotational movement of the motor shaft (10) into a cyclic, approximately linear forward and backward movement of the connection element (5, 80), whereby the connection element (5, 80) brings about a cyclic movement of the vacuum diaphragm (4). The backward movement of the connection element (5, 80) per cycle is brought about by a first rotation angle of the motor shaft (10), which is not equal in size to a second rotation angle of the motor shaft (10) due to the transmission (6, 7, 8), wherein the second rotation angle brings about the forward movement of the connection element (5, 80) per cycle. The diaphragm vacuum pump according to the invention can be formed such that it is small and low-noise and yet still has an optimum performance.