Pump Vane Communication Groove for Pulsation Suppression
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Solution Overview
Problem
Vane-type pump devices experience pulsation in discharge pressure due to rapid pressure increases in pump chambers when the leading vane reaches the discharge port, making pressure control difficult and leading to excessive internal pressure.
Innovation Solution
A pump device design featuring a rotor with slits and movably positioned vanes, a cam ring forming pump chambers, and communication grooves that allow working fluid from the discharge port to be introduced into the suction port, reducing pressure peaks by transferring fluid from the leading to the following pump chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a notch is formed to open only to the first pump chamber, then the structure is simple, but the pressure control of the first pump chamber is difficult and the internal pressure becomes excessively high
Solution Approach 1:
The communication groove is segmented into two functional zones: a first communication groove opening to the first pump chamber and a second communication groove opening to the second pump chamber. This segmentation allows independent pressure control of each chamber, preventing excessive pressure buildup in the first pump chamber while maintaining structural simplicity.
Solution Approach 2:
The communication groove acts as an intermediary channel between the first and second pump chambers. By introducing this intermediate fluid passage, the system can transfer fluid between chambers to regulate pressure, solving the pressure control issue without complex external control mechanisms.
2Manufacturing precision
If the first pump chamber is sealed to maintain pressure, then pressure control is improved, but the pulsation phenomenon occurs due to rapid pressure increase
Solution Approach 1:
The communication groove is positioned to open to the second pump chamber before the first pump chamber reaches its peak pressure state. This preliminary action allows fluid to be transferred to the second chamber in advance, gradually equalizing pressure and preventing the rapid pressure increase that causes pulsation.
Solution Approach 2:
The invention converts the harmful rapid pressure increase in the first pump chamber into a beneficial gradual pressure equalization process. By strategically positioning the communication groove, the system uses the pressure differential to transfer fluid to the second chamber, transforming the harmful pulsation into a useful pressure regulation mechanism.
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 design effectively suppresses pulsation by gradually increasing pressure in the leading pump chamber, reducing excessive pressure increases and maintaining stable discharge pressure.
Implementation Method 1
the second end portion is positioned at a rear side in a rotation direction of the driving shaft with respect to a rear-side vane, in the rotation direction of the driving shaft, of the adjacent two vanes, and communicates with the suction port... a part of working fluid in the front-side pump chamber can be introduced into a rear-side pump chamber that communicates with the suction port
Data Source
AI summary
A first communication groove (38) extending from a start point of a discharge port (36) in a direction opposite to rotation direction of vanes (22) is formed. A first end portion (38E) of this groove is connected to the start point of the discharge port (36). When a front-side vane in a rotation direction of a driving shaft (11) is positioned at the start point of the discharge port (36), a second end portion (38S) of the groove is positioned at a rear side in the rotation direction with respect to a rear-side vane coming immediately after the front-side vane, and communicates with a suction port (35). A part of working fluid in a front-side pump chamber (27-1) can therefore be introduced into a rear-side pump chamber (27-2) that communicates with the suction port (35), thereby lessening excessive pressure increase of the front-side pump chamber (27-1) and suppressing pulsation phenomenon.