Regulating Valve Gear Transmission Impact Reduction
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Solution Overview
Problem
Conventional spring return type setting/operating devices for rotary-type regulating valves face issues with reduced service life due to return impact on specific gear teeth and complex, large structures, especially when using gear or planetary gear mechanisms.
Innovation Solution
The proposed setting/operating device incorporates a paradox planetary gear mechanism with a holding torque from a second motor that is larger than the spring unit's rotating force and a detent torque that is smaller, allowing the first internal gear to switch between rotatable and unrotatable states, distributing the return impact across different gear combinations and reducing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clutch mechanism and brake mechanism are installed to enable spring return operation, then the emergency shutoff function is achieved, but the structure becomes complicated and the device size increases
Solution Approach 1:
The patent combines the clutch mechanism and brake mechanism into a single integrated structure. The clutch mechanism includes a clutch plate and clutch spring, while the brake mechanism uses the same clutch plate as the braking surface. When the brake cylinder applies braking force, it acts on the clutch plate to simultaneously achieve both clutch disengagement and braking functions, eliminating the need for separate components and reducing structural complexity
Solution Approach 2:
The clutch plate serves multiple functions: it acts as both the clutch engagement surface and the brake application surface. The same component is involved in both the clutch mechanism for disconnecting power transmission and the brake mechanism for controlling rotation speed during return operation, making the system more compact and reducing the number of parts
2Object-affected harmful factors
If a brake mechanism is installed to reduce return impact, then the impact on gears is reduced, but the device size increases
Solution Approach 1:
The brake mechanism is integrated with the clutch mechanism, sharing the clutch plate and housing space. The brake cylinder and braking surfaces are positioned within the existing clutch assembly boundaries, allowing the brake function to be added without significantly increasing the overall device volume
Solution Approach 2:
The brake components are nested within the clutch mechanism structure. The brake cylinder is positioned adjacent to the clutch plate, and the braking surfaces are formed on existing components, allowing the brake system to be contained within the space already occupied by the clutch assembly
3Reliability
If spring return operation is used to close the regulating valve, then the emergency shutoff function is achieved, but a large return impact is applied to the gears
Solution Approach 1:
The brake mechanism is activated during the return operation to apply a counteracting force that opposes the spring's rotating force. This preliminary braking action controls the rotation speed of the output shaft and reduces the impact force before the gears come to a stop, preventing damage to the gear teeth
Solution Approach 2:
The brake mechanism dynamically adjusts the rotation speed of the output shaft during return operation. By applying braking force that is proportional to the spring's rotating force, the system maintains controlled deceleration throughout the return motion, transforming the abrupt impact into a gradual stopping process
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 configuration prolongs the service life of gears by altering the gear combination that receives return impact each time and reduces the device's size by eliminating the need for a separate clutch and brake mechanism, while maintaining the self-lock function of the paradox planetary gear mechanism.
Implementation Method 1
a spring unit (9) that applies a rotating force to the output shaft when supply of electric power to the first motor and the second motor is stopped
Implementation Method 2
a second motor (8B) that applies a force to the first internal gear in a direction in which rotation of the first internal gear is prevented
Data Source
AI summary
A setting/operating device includes a first motor; a sun gear that rotates by receiving a rotating force from the first motor; a first internal gear disposed so as to surround the sun gear; a second motor that applies a force to the first internal gear in a direction in which rotation of the first internal gear is prevented; a plurality of planetary gears disposed between the sun gear and the first internal gear, engaged with the sun gear and the first internal gear, and capable of rotating on the axes thereof while revolving around the sun gear; a rotation mechanism that rotates by receiving rotating forces of the plurality of planetary gears; an output shaft that is coupled to the rotation mechanism; and a spring unit that applies a rotating force to the output shaft when supply of electric power to the first motor and the second motor is stopped.