Adjustable Annular Gap Sealing for Multi-Part Pistons
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Solution Overview
Problem
Existing gap sealing devices require a sealing ring and pressing ring to manage pressure differences, increasing manufacturing costs and complexity.
Innovation Solution
A gap sealing device with a multi-part piston and a stepped rod design, featuring a liner with a blind bore and coupling, allows for adjustable clamping force to change the annular gap width by varying the tension of the rod or bushing, eliminating the need for a sealing ring or pressing ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing ring and press ring are used to seal the gap between the rod and housing, then the sealing effect is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The invention extracts and eliminates the sealing ring and press ring from the traditional gap sealing device. Instead of using separate sealing components, the patent achieves sealing through the controlled annular gap formed by the piston and housing, managed by tensioning elements that adjust the gap width to control leakage without requiring additional sealing rings or pressing rings.
Solution Approach 2:
The invention changes the approach from using mechanical sealing components to controlling the gap width parameter. By adjusting the tension in the rod or bushing, the gap width is varied to achieve the desired sealing effect and leakage control, replacing the need for complex sealing ring assemblies with a parameter-based solution.
2Reliability
If a sealing ring and press ring are used to seal the gap between the rod and housing, then the sealing effect is improved, but the manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the sealing ring and press ring from the traditional gap sealing device. Instead of using separate sealing components, the patent achieves sealing through the controlled annular gap formed by the piston and housing, managed by tensioning elements that adjust the gap width to control leakage without requiring additional sealing rings or pressing rings.
Solution Approach 2:
The invention changes the approach from using mechanical sealing components to controlling the gap width parameter. By adjusting the tension in the rod or bushing, the gap width is varied to achieve the desired sealing effect and leakage control, replacing the need for complex sealing ring assemblies with a parameter-based solution.
3Reliability
If the gap width is reduced to decrease leakage, then the sealing effect is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention introduces dynamic adjustment capability to the gap width through tensioning elements. Instead of relying on fixed manufacturing precision to achieve a small gap, the system allows the gap width to be dynamically adjusted by varying the tension in the rod or bushing, enabling precise leakage control without requiring extremely tight manufacturing tolerances.
Solution Approach 2:
The invention changes the approach from using mechanical sealing components to controlling the gap width parameter. By adjusting the tension in the rod or bushing, the gap width is varied to achieve the desired sealing effect and leakage control, replacing the need for complex sealing ring assemblies with a parameter-based solution.
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
Enables easy adjustment of the sealing effect and leakage amount by varying the tension, reducing manufacturing costs and simplifying the design while maintaining effective sealing across high and low-pressure areas.
Implementation Method 1
A gap width of the annular gap that is reduced compared to the nominal gap width can be adjusted in a range radial to the change in stiffness by tension-related widening of an outer diameter of the sleeve section of the cylinder liner depending on the set clamping force
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a gap seal device, comprising: - a housing (2), which has a fluid-filled guiding chamber (22); - a multi-part piston (3), which can be translationally and/or rotationally moved in the guiding chamber (22); wherein the piston (3) separates a high-pressure region (23) from a low-pressure region (24) of the guiding chamber (22), the piston forming an annular gap (9) having a nominal gap width (S0) with an inner wall (25) delimiting the guiding chamber (22); wherein the piston (3) has a stepped rod (4), a sleeve (5), which is slipped over a stepped-down region (42) of the rod (4) and which has a blind hole (54), and a coupling (7); wherein, in the stepped-down region (42) of the rod (4) or in a tube portion (52) of the sleeve (5), at least one stiffness change (43, 56) is provided; wherein a gap width (SV) of the annular gap (9) which is reduced in comparison with the nominal gap width (S0) can be set in a region radial to the stiffness change (43, 56) by means of stress-caused expansion of an outside diameter of the tube portion (52) of the sleeve (5) in accordance with the set stressing force (F).