Vacuum Pump Motor Cooling Arrangement
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Solution Overview
Problem
Existing vacuum pump cooling arrangements, particularly those using a single shaft-mounted fan, are inadequate for maintaining motor housing temperatures within safe limits during low-speed operation or when the pump is idle, as they fail to provide sufficient cooling, potentially leading to overheating and failure to start issues.
Innovation Solution
The integration of a control cooling mechanism that generates a cooling gas flow independent of the motor's rotational speed, allowing it to cool the motor housing, and vice versa, utilizing a Venturi effect to enhance gas flow through strategically positioned openings between the control and motor housings, ensuring continuous cooling even when one mechanism is inoperative.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single shaft-mounted fan is used for cooling the motor housing, then the device complexity is reduced, but the motor housing temperature rises during low-speed operation or idle periods
Solution Approach 1:
The patent combines the motor cooling mechanism and control cooling mechanism into a single integrated cooling system. The control housing is positioned within the motor housing, and both cooling mechanisms share the same cooling gas flow path, allowing them to work together to cool the motor housing effectively even when one mechanism is inoperative or operating at reduced capacity
Solution Approach 2:
The cooling gas flow path serves multiple functions: it cools the control housing, cools the motor housing directly, and provides backup cooling capability when one mechanism is inoperative. The system is designed so that the control cooling mechanism can compensate for insufficient motor cooling during low-speed operation, making the cooling system universally effective across all operating conditions
2Use of energy by moving object
If the pump operates at low speed or remains idle, then energy consumption is reduced, but the motor housing temperature exceeds safe limits due to insufficient cooling
Solution Approach 1:
The control cooling mechanism, which operates independently of the motor shaft rotation, provides self-service cooling capability. When the motor runs at low speed or is idle, the control cooling mechanism continues to operate and directs cooling gas to the motor housing through the positioned openings, ensuring continuous cooling without requiring additional energy input proportional to motor speed
3Object-affected harmful factors
If the control housing is positioned away from the motor housing, then thermal interference between control and motor is reduced, but the cooling gas flow path becomes longer and less efficient
Solution Approach 1:
The control housing is nested within the motor housing, creating a compact arrangement where the control cooling mechanism can directly access the motor housing for cooling. This nested configuration minimizes the cooling gas flow path length while maintaining thermal separation between control and motor components through strategic positioning and the use of cooling gas flows
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 effectively maintains the motor housing temperature within safe limits during slow speeds and after shutdown, preventing overheating and ensuring reliable pump operation, while also allowing for a more compact and efficient design by reducing the size of the motor cooling mechanism.
Implementation Method 1
utilizing a Venturi effect to enhance gas flow through strategically positioned openings between the control and motor housings
Implementation Method 2
a motor cooling mechanism supported for rotation by the drive shaft to generate a flow of cooling gas along a first flow path for cooling the motor housing
Implementation Method 3
the cooling gas flow along the second flow path cools the motor housing when the motor cooling mechanism is inoperative
Implementation Method 4
guiding a cooling gas for cooling the control and for guiding the cooling gas flow to at least one opening of the control housing
Data Source
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AI summary
An improved cooling arrangement for a vacuum pump motor and control is provided; wherein both the motor and control are provided with cooling mechanisms and housed in respective housings connected by at least one opening. The cooling mechanism of the motor or the cooling mechanism of the control provide additional cooling to either the control or motor respectively.