Rotary Vane Pump Axial Chamber Modulation for Variable Capacity
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Solution Overview
Problem
Conventional rotary vane pumps with variable suction/discharge amount face limitations in component commonality and manufacturing costs due to restricted adjustable displacement within fixed housing spaces, leading to increased costs and potential vibration or collision noise issues.
Innovation Solution
The vane chamber is designed to be extendable/retractable in the axial direction of the vane rotor, allowing variable capacity modulation without enlarging the radial size, and a transmission drive device balances the rotational speed ratio between active and passive pumps using a closed driving loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the adjustable displacement amount is increased within the fixed space of the housing, then the suction/discharge amount of the pump is improved, but the radial sizes of the pump body and components are enlarged
Solution Approach 1:
The patent transitions from radial expansion to axial extension by making the vane chamber body movable in the axial direction. The vane chamber body can be extended axially to increase the suction/discharge amount without enlarging the radial size of the pump body, effectively solving the spatial constraint problem through dimensional transformation.
Solution Approach 2:
The vane chamber body is designed as a movable component that can dynamically adjust its position axially relative to the housing. This dynamic structure allows the pump to vary its suction/discharge amount on-demand by controlling the axial position of the vane chamber body, rather than being fixed at a single displacement setting.
2Adaptability or versatility
If different pumps with different suction/discharge amounts are manufactured, then the application range is improved, but the manufacturing cost is increased due to low component commonality
Solution Approach 1:
The pump housing and other components are designed with universal dimensions that can accommodate vane chamber bodies of different axial lengths. This allows a single housing design to support multiple suction/discharge amounts by simply changing the axial position or length of the vane chamber body, rather than requiring completely different pump designs for different applications.
Solution Approach 2:
The movable vane chamber body enables a single pump unit to dynamically adapt to different suction/discharge requirements through axial position adjustment. This eliminates the need to manufacture multiple static pump variants, as one pump can be reconfigured for different applications by adjusting the vane chamber body position.
3Productivity
If the pressure difference between suction side and discharge side is excessively great, then the suction/discharge amount is improved, but the radial extension/retraction displacement amount of vanes becomes too large causing vibration or collision noise
Solution Approach 1:
The patent addresses the excessive vane displacement problem by extending the vane chamber body axially rather than radially. This axial extension provides the necessary circulation space for high suction/discharge amounts while maintaining a compact radial profile, thereby limiting the radial extension/retraction displacement of vanes and reducing vibration and noise.
Data Source
AI summary
A pump with variable suction/discharge amount and a transmission drive device and a driving method thereof. The pump is a rotary vane pump having a vane chamber body. The vane chamber body is composed of a fixed wall member, a movable wall member, a movable vane chamber sleeve and a vane rotor. The vane chamber is extendable/retractable in an axial direction of the vane rotor. At least two pumps are assembled in communication with each other to form a closed loop for the active pump to drive the passive pump. In operation, passive the vane chambers of the active pump and the passive pump are automatically extended/retracted and modulated until the driving force and the load resistance achieve a balanced state passive, the vane chambers and the rotational speeds of the active pump and the passive pump are automatically adjusted to be in inverse proportion to each other.