Rotary Vacuum Pump Discharge Channel with Compensating Valve
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Solution Overview
Problem
Rotary vacuum pumps face issues with oil filling the suction chamber upon sudden stoppage, leading to increased moment of rotation and noise, and risk of oil leakage into the vacuum chamber, which can cause damage and inefficiency.
Innovation Solution
A valve means is provided between the oil chamber and discharge channel, combined with a compensating channel connecting to atmospheric pressure, preventing backflow and ensuring quick pressure compensation to maintain atmospheric pressure in the suction chamber, and a partially covered groove in the housing for controlled oil emulsification to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closure means is provided to prevent oil filling in the suction chamber, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The invention extracts the harmful oil from the discharge channel and redirects it into the oil chamber through the side opening, separating the oil removal function from the main discharge path. This eliminates the need for complex closure means while maintaining reliability.
Solution Approach 2:
The side opening acts as an intermediary pathway that allows oil to be transferred from the discharge channel to the oil chamber without requiring complex valves or closure mechanisms. This simple opening mediates the oil separation process effectively.
2Object-affected harmful factors
If the suction chamber is brought to atmospheric pressure after stoppage, then the harmful effects are reduced, but additional control mechanisms are required
Solution Approach 1:
The side opening is pre-configured to allow oil to drain into the oil chamber before any potential backflow can occur during stoppage. This preliminary oil removal action prevents the need for active pressure control mechanisms during emergency stoppages.
Solution Approach 2:
The system uses the pump's own discharge pressure to force oil into the oil chamber through the side opening during operation, and the same pressure differential automatically reverses during stoppage to prevent backflow, eliminating the need for external control systems.
3Stability of the object's composition
If oil is removed from the discharge channel during operation, then the sealing effect is improved, but the device complexity increases
Solution Approach 1:
The invention merges the oil removal function with the existing discharge channel structure by incorporating a side opening that leads directly to the oil chamber. This combines multiple functions (discharge and oil separation) into a single integrated structure without adding complex mechanisms.
Solution Approach 2:
The side opening serves multiple functions: it allows oil to be removed from the discharge channel during operation, provides a pathway for pressure equalization, and enables the oil chamber to be replenished. This multi-functionality eliminates the need for separate mechanisms for each function.
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
Prevents oil filling in the suction chamber, reduces noise by controlled emulsification, and ensures efficient evacuation and sealing, avoiding damage and leakage, with rapid pressure compensation and accurate air and oil management.
Implementation Method 1
During rotation, the sliding vanes will be pressed against an inner wall of the suction chamber under the effect of the centrifugal force
Implementation Method 2
In case of failure of the rotary vacuum pump or also of an intended stoppage of the rotary vacuum pump, air is sucked through the compensating channel due to the lower pressure existing in the suction chamber
Data Source
AI summary
A rotary vacuum pump includes a suction chamber (12) in a housing (10). A rotor (14) is eccentrically mounted in the suction chamber (12). Sliding vanes (18) are connected to the rotor (14). Further, a discharge channel (30) is connected to the suction chamber (12) and to an oil chamber (32). A valve (38) is disposed between the discharge channel (30) and the oil chamber (32) in order to prevent the medium from flowing back from the oil chamber (32) into the suction chamber (12). At least one compensating channel (50) is connected to the discharge channel (30) and to the oil chamber (32).