The power required to compress gas in a Roots pump is directly proportional to the pressure difference. If the pressure difference becomes too high, the pump may experience an overload condition. This overload can lead to damage to the motor windings, specifically burning of the windings.
There are several primary methods to address the issue of pump overload effectively:
Installing a mechanical automatic pressure relief bypass valve
This valve is installed in the bypass pipeline between the outlet and inlet of the Roots pump. Its purpose is to regulate the pressure difference within the pump’s rated limit. When the pressure difference reaches the rated value, the valve automatically opens, establishing a connection between the outlet and inlet of the Roots pump. As a result, the pressure difference between the two points rapidly decreases, allowing the Roots pump to operate under a nearly negligible load.
In situations where the pressure difference falls below the rated value, the bypass valve promptly closes. This action redirects the gas flow through the Roots pump from the primary pump. Additionally, Roots pumps equipped with a bypass overflow valve offer the convenience of simultaneous startup with the primary pump. This setup simplifies the overall operation of the system, providing enhanced efficiency and ease of use.
Implementing hydrodynamic coupling for overload prevention
The utilization of a hydrodynamic coupling effectively prevents pump overload and allows the pump to operate even under high pressure differentials. This coupling is installed between the pump and the electric motor, serving as a vital link.
During normal operation, the hydrodynamic coupling seamlessly transfers the rated torque from the motor to the pump, ensuring efficient power transmission. The maximum pressure differential that the Roots pump can handle is determined by the maximum torque transmitted through the hydrodynamic coupling. This torque transmission is skillfully regulated by adjusting the fluid quantity present within the coupling.
In scenarios where the pump operates under high pressure differentials or commences startup simultaneously with the preceding stage pump, the hydrodynamic coupling introduces a controlled speed difference or slip. This deliberate slip limits the transmitted torque, thereby enabling the pump to operate at a reduced speed. As the gas load gradually decreases during the pumping process, the Roots pump progressively accelerates until it reaches its optimal rated speed, ensuring smooth and efficient operation.
Utilizing vacuum electrical components for pump inlet pressure control
This meticulous control mechanism ensures the reliable and precise operation of the Roots pump while maintaining the desired pressure levels within the system.
To effectively control the pump’s inlet pressure, consider installing vacuum membrane relays or vacuum pressure switches along the inlet pipeline of the Roots pump. These pressure-sensitive components play a vital role in the system’s operation.
During the startup of the vacuum system, these components continuously monitor the pressure at the pump’s inlet. If the pressure falls below the specified threshold, known as the allowable startup pressure, the pressure-sensitive elements promptly send a signal.
Upon receiving the signal, the electrical control system utilizes it to activate the Roots pump, initiating its operation. Simultaneously, any bypass valves present in the vacuum system are closed to optimize the pump’s efficiency and performance.
On the other hand, if the pressure at the pump’s inlet exceeds the predetermined value, the Roots pump is automatically deactivated. Alternatively, if a bypass pipeline is incorporated into the vacuum system, the bypass valve opens to divert the flow, ensuring the pump operates within safe limits.
This meticulous control mechanism ensures the reliable and precise operation of the Roots pump while maintaining the desired pressure levels within the system.
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