Vane Pump Recess Anchoring for Thermal Expansion
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Solution Overview
Problem
Existing vane pumps face issues with secure anchoring of vanes at higher temperatures due to different coefficients of expansion in plastics, leading to potential detachment and reduced performance.
Innovation Solution
Incorporating transverse recesses and undercuts in the fastening section of the vane, with retaining surfaces and a staggered groove arrangement, ensures secure anchoring of the wing ends on the base body, allowing operation at higher temperatures and increased dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vane end is made of a different plastic material with favorable wear and friction properties, then the wear resistance and friction characteristics are improved, but the secure anchoring of the vane end to the base body deteriorates at higher temperatures due to different coefficients of expansion
Solution Approach 1:
The fastening section is segmented into multiple regions with grooves running parallel to the end face, creating separate anchoring zones. This segmentation allows the second plastic material to be distributed in controlled portions within grooves, ensuring secure anchoring even at higher temperatures where thermal expansion differences occur.
Solution Approach 2:
The invention introduces a transverse dimension to the anchoring structure by providing grooves that run parallel to the end face (transverse direction) rather than only in the longitudinal direction. This transverse grooving creates a three-dimensional anchoring network that restrains the vane end against detachment in vertical directions while accommodating thermal expansion.
2Productivity
If the vane is made taller in the vertical direction to increase pumping capacity, then the pumping power is improved, but the secure connection of the vane end to the base body deteriorates at higher operating temperatures
Solution Approach 1:
The fastening section is divided into multiple grooves running parallel to the end face, creating segmented anchoring zones distributed across the vane end. This segmentation provides multiple independent anchoring points that collectively secure taller vanes against thermal detachment, enabling increased pumping capacity without compromising connection security.
Solution Approach 2:
The vane comprises a composite structure with a base body made of a first plastic material and a vane end made of a second plastic material with different properties. The fastening section contains grooves filled with the second plastic material, creating a composite anchoring system that accommodates differential thermal expansion while securing the taller vane structure.
3Reliability
If grooves are filled with the second plastic material to anchor the vane end, then the anchoring is improved, but the detachment in vertical directions occurs at higher temperatures due to insufficient restraint
Solution Approach 1:
The invention adds transverse grooves running parallel to the end face, creating restraint in the transverse dimension. This transverse grooving works together with longitudinal grooves to form a three-dimensional anchoring network that effectively restrains the vane end against vertical detachment caused by thermal expansion differences at higher operating temperatures.
Solution Approach 2:
The fastening section is segmented into multiple grooves distributed across the vane end surface. This segmentation creates multiple distributed anchoring points that collectively provide superior restraint against thermal detachment compared to single grooves, while the grooves are filled with the second plastic material to enhance anchoring strength.
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 enhances the anchoring of the vane ends, preventing detachment and enabling higher operating temperatures and increased pumping capacity, thus improving the reliability and efficiency of the vane pump.
Implementation Method 1
the end of the wing being formed in a transverse direction in each case with at least one recess (36, 38, 40, 42) which is introduced from the front (16) or back (18) into the fastening section (26) and into which the second plastic material of the respective end of the wing (24) engages when the end of the wing is molded on
Implementation Method 2
at higher operating temperatures, due to the different coefficients of expansion of the different plastics, the ends of the wings are no longer securely anchored to the base body
Data Source
Figure 1~3
Figure 2
Figure 4~7
AI summary
Vane (10) for a vane pump (60), in particular for a vacuum pump, wherein the vane (10) is rotatable about an axis of rotation by a rotor (66) in a pump chamber (64) and guided longitudinally in the rotor (66), with a top (12) and a bottom (14) for contact with the bottom and top of the pump chamber (64), with a front (16) and a rear (18) opposite the front (16) for delimiting pressure chambers, with at least one end face (20) for sliding contact with an inner wall (68) of the pump chamber (64), wherein the vane (10) has a base body (22) made of a first plastic material and a vane end (24) formed by a second plastic material and forming the end face (20) of the base body (22), and wherein the base body (22) has a fastening section (26) formed by the vane end (24), characterized in thatthat the fastening section (26) has at least one recess (36, 38, 40, 42) extending in a transverse direction to the front and/or back (16, 18).