Spring-Loaded Piston Damping Pressure Pulsation in Compressors
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Solution Overview
Problem
Existing compressor systems in air-conditioning systems of motor vehicles suffer from pressure pulsation noise, which is particularly bothersome during low volume flows of refrigerant, leading to discomfort for passengers and increased production costs due to complex silencer designs.
Innovation Solution
An apparatus with a housing and a spring-loaded piston element that moves axially within the housing, controlling the flow cross section of inlet and outlet openings to reduce pressure pulsation through a series of valve-like seats and expansion chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a throttle point with constant cross section is used to dampen pressure pulsation, then pressure pulsation is reduced, but pressure losses increase with increasing flow cross section
Solution Approach 1:
The patent applies a movable piston element that dynamically adjusts the flow cross-section based on operating conditions. The piston can shift position to vary the opening area of the throttle point, allowing optimal dampening effect across different flow rates while minimizing pressure losses. This dynamic adjustment resolves the contradiction by adapting the throttle characteristic to actual operating demands rather than using a fixed geometry.
Solution Approach 2:
The invention changes the geometric parameter of the flow cross-section dynamically through piston movement. By varying the opening area as a parameter in response to operating conditions, the system achieves effective pressure pulsation dampening across different flow ranges without the constant energy penalty associated with fixed-throttle designs.
2Object-affected harmful factors
If spring-loaded return valves are used to suppress oil migration and dampen pressure pulsation, then pressure pulsation is reduced, but the valve geometry and spring constant determine opening characteristics that may increase pressure losses
Solution Approach 1:
The movable piston element provides dynamic control of the throttle opening, replacing the static valve geometry and spring constant approach. The piston position can be actively adjusted to optimize the balance between dampening effectiveness and pressure loss minimization across varying operating conditions, particularly adapting to different flow rates and pressure differential scenarios.
3Object-affected harmful factors
If complex silencer designs are used to reduce pressure pulsation noise, then noise is reduced, but production costs increase
Solution Approach 1:
The movable piston element serves multiple functions: it acts as both a compressor component for volume control and as a dynamic throttle for pressure pulsation dampening. This multi-functionality eliminates the need for separate complex silencer structures, reducing production costs while maintaining effective noise reduction through the integrated pressure control mechanism.
Solution Approach 2:
The invention merges the pressure control function with the pressure pulsation dampening function in a single integrated mechanism. The piston element simultaneously performs compression ratio adjustment and throttle-based pulsation suppression, combining what would traditionally require separate components into one unified system, thereby simplifying manufacturing and reducing costs.
4Object-affected harmful factors
If the flow cross section is changed to dampen pressure pulsation, then pressure pulsation is reduced, but compressor performance may be affected
Solution Approach 1:
The dynamic piston adjustment allows the system to optimize the balance between dampening effectiveness and performance maintenance. By actively controlling the throttle opening based on real-time operating conditions, the system can minimize restrictions to flow during high-performance需求的 scenarios while providing adequate dampening when pulsation becomes problematic, thus maintaining overall compressor productivity.
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
The apparatus effectively reduces pressure pulsation noise, minimizing pressure losses and maintaining compressor performance, while being compact, cost-effective, and compatible with existing components.
Implementation Method 1
The piston element is movable in an axial direction within a volume enclosed by the housing and supported in a beared manner on the housing via a spring element
Data Source
AI summary
An apparatus for damping pressure pulsation for a compressor of a gaseous fluid in a refrigerant circuit including a housing with an inlet opening and at least one first outlet opening and a piston element movable in an axial direction within a volume enclosed by the housing and supported on the housing in a beared manner via a spring element, wherein the piston element respectively controls a flow cross section of the inlet opening and the first outlet opening, wherein the piston element and the housing have at least one first sealing surface and a second sealing surface. The first sealing surfaces form a first seat and the second sealing surfaces form a second seat, wherein between the seats, one chamber enclosed by the housing and the piston element for expanding the fluid when flowing into the chamber and/or at least one second outlet opening in the housing is formed.