Sliding Vane Pump Venting Layout for Noise and Lubricant Backflow
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Solution Overview
Problem
Rotary vane pumps suffer from continuous noise generation and issues during shutdown, such as lubricant suction into the rotor receiving chamber, leading to increased operating noise, drive torque, mechanical resistance, and wear.
Innovation Solution
A rotary vane pump design with separate discharge, ventilation, and compensation channels, optimized for noise reduction and efficient lubricant management, featuring channels that open into the lubricant chamber below or above the lubricant level to prevent lubricant backflow and facilitate rapid pressure equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the discharge channel opens into the lubricant chamber above the lubricant level, then rapid pressure equalization is achieved during shutdown, but lubricant flows back into the conveying chamber causing increased noise and mechanical resistance
Solution Approach 1:
The patent introduces a compensation channel as an intermediary element between the discharge channel and the lubricant chamber. This compensation channel includes a compensation element that selectively controls fluid communication: during operation it allows pressure equalization, and during shutdown it prevents lubricant backflow into the conveying chamber while still enabling pressure equalization through the compensation channel
2Object-generated harmful factors
If a valve device is added between the discharge channel and lubricant chamber to prevent backflow, then lubricant backflow is reduced, but device complexity increases
Solution Approach 1:
The compensation element in the compensation channel is designed to automatically respond to pressure differential changes without external control. During operation, the pressure differential keeps the compensation element in a position that allows pressure equalization. During shutdown, the reversed pressure differential automatically positions the compensation element to prevent lubricant backflow, achieving self-regulating protection without complex valve mechanisms
3Productivity
If the rotor is arranged eccentrically to create varying conveying chamber volume, then fluid conveying function is achieved, but continuous noise generation occurs
Solution Approach 1:
The compensation channel acts as an intermediary pressure equalization pathway that reduces pressure differential fluctuations during operation. By providing an additional route for pressure equalization between the conveying chamber and lubricant chamber, it dampens pressure spikes and reduces the noise generated by the eccentric rotor's cyclic volume changes
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 design achieves significant noise reduction and minimizes lubricant ingress into the conveying chamber, reducing mechanical wear and maintaining pump efficiency during shutdown and restart.
Implementation Method 1
a rotor (4) arranged eccentrically in the rotor receiving chamber (3) in such a way that there is at least one conveying chamber (11) whose volume varies cyclically during rotation of the rotor (4)
Implementation Method 2
A valve device is provided between the discharge channel and the lubricant chamber to prevent fluid, in particular lubricant and/or fluid to be conveyed, from flowing back out of the lubricant chamber into the conveying chamber
Implementation Method 3
The use of a compensation channel is suggested, which is connected to the discharge channel and the lubricant chamber and is integrated into the valve device. This is intended to provide rapid pressure equalization in the conveying chamber when the rotary vane pump is switched off
Implementation Method 4
Another task of the lubricant is to provide additional sealing between the inner wall of the housing interior and the wall elements, between the wall elements and the rotor, and between other components of the rotary vane pump
Data Source
AI summary
The invention relates to a rotary vane pump (1) for conveying a fluid to be conveyed, with a housing (2), with a rotor receiving chamber (3) and a lubricant chamber (14). An eccentrically arranged rotor (4) is provided in a rotor receiving chamber (3) in such a way that at least one conveying chamber (11) is produced, the volume of which varies cyclically during rotation of the rotor (4). Furthermore, the rotary vane pump (1) has an intake channel (12) for feeding the fluid to be conveyed into the conveying chamber (11) and a discharge channel (13) for discharging the fluid to be conveyed out of the conveying chamber (11) in the direction of the lubricant chamber (14), wherein a valve device (21) is provided between the discharge channel (13) and the lubricant chamber (14) in order to prevent a backflow of fluid, in particular of lubricant and/or of fluid to be conveyed, from the lubricant chamber (14) into the conveying chamber (11). The rotary vane pump (1) is furthermore designed and set up in such a way that the discharge channel (13) is arranged in such a way that it opens into the lubricant chamber (14). Furthermore, the rotary vane pump (1) has at least one ventilation channel (26), which is fluidically connected by a conveying chamber end (28) to the conveying chamber (11) and fluidically connected by a ventilation end (27) to a chamber outside the conveying chamber (11), as well as at least one compensation channel (29), which is fluidically connected by a conveying chamber end (31) to the conveying chamber (11) and fluidically connected by a compensation end (30) to the lubricant chamber (14). In this way, the rotary vane pump (1) is designed and set up in such a way that the compensation end (30) opens into the lubricant chamber (14) below the lubricant level (24) in an operating state of the rotary vane pump (1) and opens into the lubricant chamber (14) above the lubricant level (34) in a resting state of the rotary vane pump (1).