Gland Nuts With Cylindrical Gear Wheels for Double Packing Seals
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Solution Overview
Problem
Adjusting gland nuts in positive displacement machines with double packing seals is complex and hazardous, especially when reinforcement walls are present, leading to unreliable fluid seals and safety concerns during operation.
Innovation Solution
The use of cylindrical gear wheels with straight teeth on the ring nuts and helical worm screws allows for precise and safe adjustment of the gland nuts, enabling independent calibration of both insulation chambers without interference, ensuring reliable fluid seals between the piston and cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual adjustment of gland nuts is performed, then the compression level of packing can be maintained, but the operation becomes complex and hazardous requiring worker experience and safety precautions
Solution Approach 1:
The system performs self-adjustment of gland nut compression through an automated actuation mechanism that eliminates the need for manual worker intervention. The actuator automatically adjusts the gland nuts to maintain proper packing compression, making the system self-servicing while ensuring reliable fluid seals.
Solution Approach 2:
The manual mechanical adjustment process is replaced with an automated actuation system that uses mechanical components (actuator, linkage mechanism) to automatically adjust the gland nuts. This substitution eliminates the need for worker intervention while maintaining seal reliability.
2Productivity
If adjustment is performed during machine operation, then immediate correction of leakage is possible, but worker safety is compromised due to exposure to moving parts and hazardous fluids
Solution Approach 1:
The automated actuation system enables the machine to adjust its own gland nuts during operation without requiring worker presence near moving parts or hazardous fluid leaks. This self-service capability maintains productivity while eliminating worker safety risks.
Solution Approach 2:
The actuator serves as an intermediary device that performs the adjustment function remotely, mediating between the control system and the gland nuts. This intermediary mechanism enables adjustment during operation without direct worker intervention in hazardous zones.
3Strength
If reinforcement walls are present between cylinders, then structural strength is improved, but the engagement element cannot complete its full stroke for proper gland nut adjustment
Solution Approach 1:
The adjustment mechanism is segmented into multiple components (actuator, linkage, engagement element) that can navigate around structural obstacles. The linkage mechanism is designed to accommodate the presence of reinforcement walls by routing through available space while maintaining full adjustment capability.
Solution Approach 2:
The engagement element's movement path is redesigned to operate in alternative dimensions or spatial configurations that bypass reinforcement walls. The linkage mechanism uses multi-dimensional motion paths to achieve full gland nut adjustment stroke despite structural obstacles between cylinders.
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 facilitates easy and immediate adjustment of the gland nuts, ensuring perfect fluid seals and enhancing safety by allowing for independent operation of both insulation chambers, reducing the risk of fluid leakage and worker exposure to hazardous fluids.
Implementation Method 1
The adjustment device comprises a helical worm screw (120) and a cylindrical gear wheel with straight teeth (110)... the helical worm screw (120) is engaged with the cylindrical gear wheel with straight teeth (110) so as to actuate it
Implementation Method 2
The cylindrical gear wheel with straight teeth (110) is arranged around the second gland (9) so as to make it rotate
Implementation Method 3
By screwing the gland on the cylinder, this compresses the packings that, abutting against a fixed wall of the insulation chamber, deform in the radial direction ensuring the mechanical fluid seal
Implementation Method 4
Glands are usually provided with a tubular threaded portion which is coupled with a threading formed on the inner or outer wall of the cylinder
Data Source
AI summary
A positive displacement machine comprises a cylinder inside which there are a mobile piston, at least one first and one second insulation chamber containing a respective set of gaskets, at least one first and one second gland each of which is suitable for operating on one of the sets of gaskets, each gland comprising a tubular threaded portion and a ring nut fixedly attached to the tubular threaded portion. A sleeve able to slide with respect to said cylinder has a first end in contact with the first set of gaskets and a second threaded end for receiving in engagement the tubular threaded portion of the second gland, the sleeve being slidingly engaged by the first gland, and at least one of the ring nuts being a cylindrical gear wheel with straight teeth.