Centrifugal Separator Valve Body Sealing Against Rotor Pressure
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Solution Overview
Problem
Centrifugal separators face challenges in maintaining effective sealing of valve bodies against the seat due to overpressure or underpressure in the centrifuge rotor and increasing peripheral speeds, which affects the operation of intermittently openable peripheral ports.
Innovation Solution
The valve body is made movable from the closing position to the opening position against the direction of the outlet flow, with a closing mechanism comprising an annular control slide and control chamber, allowing the valve body to be lifted from the valve seat independently of rotor pressure and speed, and an annular outlet chamber for instant discharge of hydraulic medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body is pressed against the seat with significant force to maintain sealing, then sealing reliability is improved, but the device complexity and operational reliability under pressure variations worsen
Solution Approach 1:
Instead of pressing the valve body against the seat from below (conventional approach), the invention inverts the approach by having the valve body rest against the seat and being lifted away by a control mechanism. This inversion eliminates the need for complex pressing mechanisms while maintaining sealing reliability through the natural rest position of the valve body.
Solution Approach 2:
The valve body is designed to automatically rest against and seal with the valve seat without requiring external pressing forces. The sealing action is self-service, where the valve body's own weight and position maintain the seal, eliminating the need for complex pressing mechanisms and improving reliability under pressure variations.
2Reliability
If the valve body is pressed against the seat to maintain sealing, then sealing is improved, but the sealing performance under overpressure or underpressure conditions worsens
Solution Approach 1:
The invention inverts the conventional sealing approach by having the valve body rest against the seat and be lifted by control pressure rather than being pressed by mechanical force. This allows the sealing interface to remain stable under varying pressure conditions, as the valve body naturally maintains contact with the seat unless actively opened.
Solution Approach 2:
The valve body design accepts that sealing may be temporarily compromised under extreme pressure conditions but is quickly restored through the control mechanism. The system tolerates brief sealing challenges during pressure transitions while maintaining overall reliability through the simple rest-position sealing design.
3Productivity
If the peripheral speed of the centrifuge rotor is increased to improve separation efficiency, then separation efficiency is improved, but the sealing of the valve body against the seat worsens
Solution Approach 1:
By inverting the sealing approach to use rest-position sealing rather than pressure-driven sealing, the valve body remains reliably sealed against the effects of increasing rotational speed. The control mechanism lifts the valve body when needed, and it naturally returns to the sealed position regardless of centrifugal forces from high-speed rotation.
Solution Approach 2:
The invention changes the sealing parameter from pressure-dependent (conventional pressing) to position-dependent (rest position). This allows the sealing to remain effective across a wide range of rotational speeds, as the valve body's gravitational rest position against the seat is not significantly affected by the centrifugal forces generated during high-speed operation.
4Adaptability or versatility
If the valve body is made movable against the direction of outlet flow, then sealing independence from pressure is improved, but the device complexity worsens
Solution Approach 1:
The invention inverts the conventional valve operation by having the valve body rest against the seat and be lifted by control pressure applied to the control chamber, rather than being pressed by mechanical means. This inversion achieves pressure independence while actually simplifying the mechanism, as the control pressure naturally pushes the valve body away from the seat in the direction of outlet flow.
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 solution ensures reliable sealing and efficient discharge of sludge regardless of rotor pressure and speed, allowing for both total and partial discharge control, enhancing the operational efficiency of centrifugal separators.
Implementation Method 1
An outlet passage is provided for discharging an outlet flow of the hydraulic medium from the closing chamber in order to move the valve slide to the open position
Implementation Method 2
In centrifugal separators of this kind, mixed solid and liquid particles forming a heavy phase, in the following sludge, are collected in an outer peripheral part of the separation space
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A centrifugal separator comprises a centrifuge rotor (3) mounted to a spindle (2) and comprising a rotor casing (4) enclosing a separation space (5). Peripheral ports (8) extend from the separation space through the rotor casing. A valve slide (12) is movable between a closed position closing the peripheral ports and an open position opening the peripheral ports. A closing chamber (16) is provided between the valve slide and the rotor casing. An inlet channel (17) supplies hydraulic medium to the closing chamber to hold the valve slide in the closed position. An outlet passage permits an outlet flow of the hydraulic medium for moving the valve slide to the open position. The outlet passage comprises outlet channels (20) extending though the rotor casing. A valve body (21) is provided in each outlet channel and movable from a closing position to an opening position against the direction of the outlet flow.