Vane Pump Side Clearance Adjustment Mechanism
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Solution Overview
Problem
Conventional vane pumps face challenges in maintaining proper side clearances during assembly and operation, leading to difficulties in assembling, sealing, and maintaining efficiency, especially due to issues with thermal expansion and misalignment of the rotor and shaft.
Innovation Solution
The introduction of a side clearance adjusting member and a thermal expansion adjusting member, along with a stud bolt for secure fixation, allows for dynamic adjustment of side clearances and thermal compensation, ensuring proper alignment and sealing without the need for external spacers or disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the side clearances are set to be large, then assembling of the vane pump becomes easy and the risk of biting foreign materials decreases, but sealability decreases to decrease efficiency
Solution Approach 1:
The invention introduces a movable adjusting member that can dynamically change the position of the rotor relative to the pump body, allowing the side clearance to be adjusted from a fixed value. This enables the system to adapt between easier assembly (larger clearance) and better sealability (smaller clearance) based on operational requirements, resolving the contradiction between assembly ease and sealability.
2Reliability
If the side surfaces are set to be small, then sealability is improved to increase efficiency, but assembling of the pump becomes difficult, and the risk of biting foreign materials increases
Solution Approach 1:
The adjusting member with movable pressing portion allows the side clearance to be dynamically adjusted. During assembly, the clearance can be temporarily increased to facilitate easier assembly and reduce foreign material risk, while during operation, the clearance can be reduced to improve sealability and efficiency, thus resolving the contradiction between sealability and assembly difficulty.
3Manufacturing precision
If a thickness gage spacer is disposed between the rotor and the pump main body to secure proper side clearances, then proper side clearances can be maintained, but it becomes difficult to assemble the vane pump
Solution Approach 1:
The adjusting member is designed to be self-adjusting through the pressing portion that contacts the rotor. By simply moving the adjusting member along the shaft, the system automatically maintains the proper side clearance without requiring external gage spacers or complex assembly procedures, thus resolving the contradiction between precision and assembly ease.
4Device complexity
If the rotor and the shaft are fixed by friction force of the set screw only, then the structure is simple, but a large external force or a temperature change causes positional relationship between the rotor and the shaft to be misaligned, resulting in a locked state
Solution Approach 1:
The adjusting member is positioned and adjusted before final operation to pre-establish the correct positional relationship between the rotor and shaft. This preliminary adjustment ensures that even under external forces or temperature changes, the rotor maintains its proper alignment with the shaft, preventing misalignment and locked states while keeping the structure relatively simple.
5Strength
If the shaft and the rotor are connected by the set screw, then fixation is achieved, but a reaction force is generated by the set screw pressing the shaft, so that it is difficult to maintain that the shaft and the rotor are parallel to each other
Solution Approach 1:
The adjusting member acts as an intermediary between the shaft and rotor, using its pressing portion to apply force to the rotor rather than using a set screw that presses the shaft. This intermediary approach achieves the necessary fixation strength while avoiding the reaction force that would cause misalignment, thus maintaining parallelism between the shaft and rotor.
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 facilitates easy and accurate assembly and maintenance of vane pumps, maintains proper side clearances under varying conditions, and reduces the impact of thermal expansion, enhancing operational efficiency and reliability.
Implementation Method 1
a thermal expansion adjusting member (9), arranged between the side clearance adjusting member (4) and a bearing (the first bearing 7) for rotatably supporting the shaft (3), and thermal expansion coefficient of the thermal expansion adjusting member (9) is larger than that of the pump main body (6) for accommodating the shaft (3)
Data Source
AI summary
A displacement pump is configured to allow for assembly while properly maintaining side clearances. The displacement pump (100, 101, 102, 103, 104, 105) for sucking and discharging a fluid such as gasoline vapor by changing pressure in a space constituted by an outer peripheral surface of a rotor (1) and an inner wall surface of a casing (2), includes a side clearance adjusting member (4), rotating with respect to the pump main body (6), for moving a shaft (3) integrally formed with the rotor (1) in an axial direction of the shaft (3).