Bottom-suction submersible pump return passage
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Solution Overview
Problem
Existing bottom-suction submersible pumps generate noise when the water level is low due to the loss of lubrication for the permanent magnet rotor, leading to inadequate rotation and poor performance.
Innovation Solution
A bottom-suction submersible pump design that includes a return passage connecting the water outlet cavity and the rotor mounting hole, allowing a small amount of water to flow back and provide lubrication to the rotor even at low water levels, thus preventing noise and ensuring smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the impeller is set close to the bottom of the submersible pump to enable low water level operation, then the pump can work when water level is low, but the rotor mounting hole becomes dry and loses lubrication, producing large noise
Solution Approach 1:
A return passage is introduced as an intermediary channel to guide water from the water outlet cavity back to the rotor mounting hole. This mediator ensures continuous water supply to the rotor mounting hole even when the water level in the container is low, maintaining lubrication and eliminating noise without requiring the rotor to be positioned at the very bottom.
Solution Approach 2:
The invention utilizes hydraulic principles by creating a dedicated water return channel that leverages water pressure and gravity to continuously supply lubricating water to the rotor mounting hole. The return passage acts as a hydraulic conduit that maintains fluid flow and pressure to the critical lubrication point regardless of external water level changes.
2Productivity
If the rotor mounting hole is positioned at the bottom for bottom-suction operation, then the pump can suction water from the bottom, but the rotor loses lubrication when water level drops below the rotor mounting hole
Solution Approach 1:
The return passage is pre-configured to establish a water supply path to the rotor mounting hole before the water level drops. This preliminary arrangement ensures that even when the main water level decreases, the rotor mounting hole receives water through the return passage, maintaining lubrication in advance before complete drying occurs.
Solution Approach 2:
The return passage serves as a dedicated intermediary water supply system that is independent of the main water level in the container. It mediates between the water outlet cavity and the rotor mounting hole, ensuring continuous lubrication supply regardless of the external water level, thus maintaining reliability while preserving bottom-suction capability.
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 effectively reduces noise and maintains the rotor's lubrication at low water levels, enhancing the pump's performance and user experience by ensuring continuous operation without noise.
Implementation Method 1
a permanent magnet rotor cooperated with the stator is installed on a mounting shaft fixed in the rotor mounting hole
Implementation Method 2
Centrifugal force of rotation of the impeller makes water in the water inlet cavity enter the water outlet cavity through the water outlet passage
Implementation Method 3
a small amount of water can flow into the rotor mounting hole through the return passage, providing lubrication for the permanent magnet rotor to rotate around the mounting shaft
Data Source
AI summary
The application relates to a bottom-suction submersible pump, wherein a pump body is combined with a base to form a water inlet cavity and combined with an upper cover to form a water outlet cavity, a water outlet passage connecting the water inlet cavity and the water outlet cavity is formed in the pump body; a stator and a circuit module are encapsulated in an accommodation cavity in the pump body, a permanent magnet rotor is installed on a mounting shaft fixed in a rotor mounting hole formed at the bottom of the accommodation cavity, the permanent magnet rotor is coaxially fixed at its lower end with an impeller which extends into the water inlet cavity; and the pump body is also provided with a return passage connecting the water outlet cavity and the rotor mounting hole, which brings water lubrication for rotation of the permanent magnet rotor.