Medium-Cooled Fluid Pump With Fan-Free Motor Cooling
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Solution Overview
Problem
Existing pump systems face challenges in achieving high performance while maintaining a low installation height and ensuring effective motor cooling, particularly when the liquid level fluctuates, leading to potential insufficient cooling of the motor.
Innovation Solution
A cooling jacket surrounding the motor chamber is connected to both the pump chamber and the outlet nozzle, with the pressure line entering at a first circumferential position and the outlet nozzle connected at a diametrically opposite second position, allowing medium-cooled cooling without the need for a fan, and the flow branches around the motor in opposite directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the pump is completely immersed in liquid for medium-cooled operation, then motor cooling efficiency is improved, but installation height increases due to required fan components
Solution Approach 1:
The invention extracts and eliminates the fan component from the pump system. By using the pumped liquid itself to cool the motor through the cooling jacket, the mechanical fan used in air-cooled systems becomes unnecessary, thereby reducing installation height while maintaining effective motor cooling.
Solution Approach 2:
The cooling jacket acts as an intermediary between the pumped liquid and the motor. The liquid flows through the cooling jacket surrounding the motor, transferring heat from the motor to the liquid without requiring direct contact between the liquid and motor, enabling efficient cooling while maintaining a compact design.
2Reliability
If the motor chamber is positioned above liquid level for air-cooled operation, then risk of liquid intrusion is reduced, but motor cooling efficiency deteriorates under high continuous loads
Solution Approach 1:
The pump housing is segmented into distinct functional zones: the pump chamber for liquid intake and pressurization, and the motor chamber for motor housing. The cooling jacket creates a separate liquid flow path that surrounds the motor chamber, allowing the motor to be cooled by liquid without the motor chamber being directly exposed to the pumped liquid, thus maintaining both cooling efficiency and protection against liquid intrusion.
Solution Approach 2:
The cooling jacket serves as an intermediary cooling system that allows indirect liquid cooling of the motor. The pumped liquid circulates through the cooling jacket, absorbing heat from the motor without the motor chamber needing to be immersed in or directly exposed to the pumped liquid, resolving the contradiction between cooling efficiency and liquid intrusion protection.
3Temperature
If a fan is added to air-cooled pumps for improved cooling, then motor cooling efficiency is improved, but device complexity and installation height increase
Solution Approach 1:
The pump system cools itself using the pumped liquid as the cooling medium. The liquid that is being pumped serves dual purposes: performing its primary pumping function and simultaneously cooling the motor through the cooling jacket. This eliminates the need for separate cooling components like fans, reducing device complexity while maintaining effective cooling.
Solution Approach 2:
The pumped liquid serves multiple functions simultaneously: it is pumped from the source, delivered to the destination, and used as the cooling medium for the motor. This multi-functionality eliminates the need for dedicated cooling system components, simplifying the overall device design while ensuring adequate motor cooling.
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 design ensures efficient motor cooling and reduces installation height by eliminating the need for a fan, while maintaining quiet operation and effective cooling even under varying liquid levels.
Implementation Method 1
the pumped medium flows around the motor in the cooling jacket, so that cooling of the motor by the pumped medium is ensured at all times
Implementation Method 2
the pumped medium flows around the motor chamber in opposite directions of rotation and rejoin upon entering the outlet nozzle
Data Source
Figure 1
Figure 2
AI summary
Liquid pump with a housing (10) forming an inlet (12), a pump chamber (14), an outlet nozzle (44) and a motor chamber (30), a shaft (16) rotatably mounted in the housing, on which an impeller (18) is arranged inside the pump chamber (14) and on which, in a section outside the pumped medium, a rotor (34) of an electric motor (28) is arranged, the rotor being surrounded by a stator (36) arranged in the motor chamber (30), and with a cooling jacket (40) surrounding the motor chamber, which is in fluid communication with the pump chamber (14) on one side and with the outlet nozzle (44) on the other, wherein a pressure line (20) connecting the pump chamber (14) to the cooling jacket (42) opens into the cooling jacket (42) in a first circumferential position (A) and the outlet nozzle (44) is connected to the cooling jacket (42) in a second circumferential position (B). is characterized bythat the housing (10) has a circumferential mounting flange (52) designed to mount the pump on a collection basin (22) for the fluid to be pumped, and that the mounting flange (52) is arranged at the level of the end of the cooling jacket (40) facing the pump chamber (14).