Door Drive Pressure Compensation via Piston and Hydraulic Fluid
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Solution Overview
Problem
Existing door and window drive systems face challenges with complex and potentially leaky sealing of pressure equalization devices, which can lead to inefficiencies and reliability issues due to aging, especially in thermal expansion scenarios.
Innovation Solution
A pressure compensation device is introduced, comprising a compensation housing filled with hydraulic fluid and a sleeve that extends into the differential housing, allowing for temperature-related volume changes to be compensated without moving parts or special sealing surfaces, and can be filled with vacuum to minimize gas presence, ensuring effective pressure equalization across varying temperatures and positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an elastic enveloping body is used to enclose gas volume for pressure equalization, then thermal expansion compensation is achieved, but sealing complexity increases and reliability decreases due to aging
Solution Approach 1:
The patent extracts the gas volume from an enclosed elastic structure and places it in an open chamber where it is bounded by the housing walls and a movable piston. This eliminates the elastic enveloping body and its associated sealing problems while maintaining the pressure equalization function through direct communication between the gas volume and hydraulic fluid.
Solution Approach 2:
The piston acts as an intermediary element between the gas volume and the hydraulic fluid. It transmits pressure changes from the thermal expanding/contracting gas to the hydraulic system without requiring seals, as the piston moves freely within the damping piston cavity while maintaining pressure equilibrium.
2Stress or pressure
If complex sealing structures are used in pressure equalization devices, then pressure containment is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The pressure equalization function is segmented into two independent parts: a gas volume chamber and a hydraulic fluid chamber, separated by a piston. Each chamber can be manufactured and assembled separately, with the piston serving as a simple dividing element that requires no complex sealing between the two pressure zones.
Solution Approach 2:
The patent replaces mechanical sealing systems (elastic enveloping bodies, sealed diaphragms) with a pressure-based equilibrium system where a movable piston allows pressure equalization without physical seals. The piston moves freely, transmitting pressure changes without requiring sealing surfaces.
3Temperature
If pressure equalization devices with moving parts are used, then pressure compensation is achieved, but device complexity increases
Solution Approach 1:
The piston in the damping device serves multiple functions simultaneously: it acts as a separator between gas and hydraulic fluid, a pressure transmission element for thermal compensation, and a damping element for controlling fluid flow. This multi-functionality eliminates the need for separate pressure equalization mechanisms.
Solution Approach 2:
The patent merges the pressure equalization function with the existing damping piston structure. The damping piston's cavity becomes the gas volume chamber, and its movement provides both damping and pressure equalization functions in a single integrated component rather than requiring separate mechanisms.
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 solution provides a simple, reliable, and position-independent pressure equalization, preventing the drive from 'falling through' due to air cushions, maintaining operational stability and efficiency by compensating for temperature-induced pressure changes without the need for complex sealing or moving parts, and allowing for flexible installation and temperature variations.
Implementation Method 1
Since gases are compressible or expandable, a temperature-related change in the volume of the hydraulic fluid is compensated
Implementation Method 2
The pressure compensation device is filled with hydraulic fluid to such an extent that the inner opening of the sleeve is always covered by hydraulic fluid
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The unit (1) has a piston (3) arranged in a housing (2) and impacted with a spring (5) i.e. shutter spring. The piston co-acts with a driven shaft (4) for opening and/or closing a leaf. A pressure balance device (8) is arranged in the housing that is filled with hydraulic fluid (9). The pressure balance device has an input cabinet, whose inner space stands in contact with an inner space of the housing of the unit via a collet. The collet passes till to a volume middle point of the cabinet, and is closed via a stopper such that vacuum filling of the unit is enabled.