Axial Piston Pump Flow Regulation via Static Head and Ball Joint
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Solution Overview
Problem
Current axial piston pumps lack mechanical regulation of flow rate and pressure, often resulting in pulsations and low efficiency, especially in single piston designs, and fail to provide volumetric fluid delivery without rotational movement.
Innovation Solution
An axial piston pump with a static head and parallel cavities, featuring a regulable movement transmission system that includes a rotary plate, ball joint support, and crank mechanism, allowing for variation of piston stroke to regulate flow rate and pressure without rotational mobility of pistons, utilizing check valves for volumetric operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single axial piston pump is used, then the structure is simple, but the efficiency is very low and flow rate cannot be regulated
Solution Approach 1:
The pump uses multiple axial pistons (at least two) arranged in parallel cavities within a static head, dividing the pumping function into multiple independent but coordinated units. This segmentation allows the system to maintain structural simplicity while achieving higher efficiency through combined operation and enabling flow rate regulation by controlling the reciprocating movement of individual pistons.
Solution Approach 2:
The invention introduces a regulable movement transmission system that dynamically controls the reciprocating movement of pistons. This system allows the flow rate to be regulated by adjusting the extent or speed of piston reciprocation, transforming a static single-function pump into a dynamic system with adjustable performance characteristics.
2Ease of operation
If radial piston or axial piston pumps are used, then the flow rate can be regulated, but the pistons rotate as a grouped assembly by way of a rotating revolver mechanism
Solution Approach 1:
Instead of rotating the pistons as a grouped assembly (traditional approach), the invention inverts the approach by keeping the pistons stationary in parallel cavities and regulating their reciprocating movement through a transmission system. This eliminates the rotating revolver mechanism while maintaining flow rate regulation capability.
Solution Approach 2:
The invention extracts the rotational movement from the piston assembly itself and separates it into a dedicated regulable movement transmission system. This allows the pistons to remain fixed in position while their reciprocating movement is controlled independently, eliminating the need for complex rotating mechanisms.
3Ease of operation
If volumetric piston pumps with multiple pistons are used, then the flow rate can be regulated, but pulsations occur in the supplied fluid
Solution Approach 1:
By using multiple pistons operating in parallel within separate cavities, the pumping action is segmented into multiple independent cycles. The combined output of multiple pistons smooths out individual piston pulsations, reducing overall fluid pulsation while maintaining flow rate regulation capability.
4Object-generated harmful factors
If the number of pistons is increased to reduce pulsations, then fluid delivery becomes smoother, but efficiency is marked loss in single piston pump design
Solution Approach 1:
The regulable movement transmission system enables dynamic control of piston reciprocating movement, optimizing the coordination between multiple pistons. This dynamic control allows the system to maintain high efficiency by minimizing dead zones and optimizing fluid displacement timing, while the multiple-piston configuration simultaneously reduces pulsations.
Data Source
Figure 1
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Figure 1b
AI summary
The axial piston pump for a fluid comprises a regulable movement transmission system that enables the flow rate of the fluid at the pump outlet to be varied; wherein by means of said rotational transmission system, the stroke of the pistons (3) that move axially within respective cavities (16) can be varied to supply a flow rate of fluid to the outlet of said cavities (16) that are distributed in a circumferential path. The variation of the fluid flow rate is carried out by means of the linear movement of a mobile runner (9) that can move in both directions in a direction parallel to the direction of movement of the pistons (3); wherein by moving said mobile runner (9) the tilt of a ball joint support (5) in which the pistons (3) are coupled by one of the ends thereof is varied.