Positive Displacement Gear Pump with Segmented Rotors
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Solution Overview
Problem
Existing positive displacement gear pumps suffer from fluid encapsulation, leading to micro-explosions that reduce rotor revolutions, cause wear, and result in mechanical failure, while vane pumps have limited revolutions and require oil lubrication.
Innovation Solution
A positive displacement gear pump design featuring a male rotor with only protuberances and a female rotor with only cavities, engaged without contact, to prevent fluid encapsulation, allowing high revolution operation and minimizing mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional gear pumps with two identical rotors having teeth and cavities are used, then fluid can be transported from suction to discharge, but fluid encapsulation occurs causing micro-explosions that reduce rotor revolutions and cause wear
Solution Approach 1:
The invention segments the rotor functions by dividing the traditional identical rotor design into two specialized rotors: one with only protuberances and another with only cavities. This segmentation eliminates the interlocking teeth-cavities mechanism that causes fluid encapsulation, allowing continuous fluid flow without trapping and micro-explosion, thereby enabling higher rotor revolutions and reducing mechanical wear.
Solution Approach 2:
Instead of the conventional design where both rotors have teeth and cavities that interlock, the invention inverts the approach by giving each rotor only one feature (protuberances or cavities). This inversion eliminates the harmful fluid trapping mechanism while maintaining the positive displacement pumping action, resolving the contradiction between productivity and reliability.
2Productivity
If vane pumps with eccentric rotor and sliding vanes are used, then pumping action is achieved, but the number of revolutions is limited and early wear of vanes occurs
Solution Approach 1:
The invention extracts and eliminates the sliding vane mechanism from the pump design, replacing it with the protuberance-cavity rotor system. This removes the source of early wear associated with sliding vanes while maintaining effective pumping action, thereby extending the service life of moving parts and enabling higher revolution operation.
3Ease of operation
If vane pumps with sliding vanes are used, then pumping action is achieved, but oil lubrication is required and separator is needed to separate oil from treated fluid
Solution Approach 1:
The invention extracts and eliminates the requirement for oil lubrication by replacing the sliding vane mechanism with the protuberance-cavity rotor system. This removes the need for oil separators and associated components, simplifying the overall system while maintaining pumping effectiveness and reducing operational complexity.
4Reliability
If male rotor with protuberances and female rotor with cavities are engaged without contact, then fluid encapsulation is prevented, but manufacturing precision is required to ensure proper engagement
Solution Approach 1:
The invention applies local quality by optimizing the specific geometric features of the protuberances and cavities to ensure proper engagement. By carefully designing the shape, size, and distribution of these features, the system achieves reliable fluid flow without encapsulation while maintaining manufacturability through well-defined local geometries rather than requiring extreme precision across the entire rotor interface.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A positive displacement pump (1) comprises a casing with a central body (2) and two closing lids (20), said central body (2) being provided with two cylindrical communicating chambers (22, 23), one suction pipe (I) and one discharge pipe (O), and two rotors (3, 4) revolvingly mounted in said chambers (22, 23) of the central body and supported by shafts (5, 6) revolvingly mounted in said closing lids (20). The two rotors comprise: a male rotor (3) comprising only protuberances (30), not cavities, and a female rotor (4) comprising only cavities (40), not teeth or protuberances.