Centrifugal Pump Sealing via Segmented Metallic Casing
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Solution Overview
Problem
Conventional centrifugal pumps are not suitable for high-pressure and air-tight applications, such as cooling systems for internal combustion engines and refrigerant circulation in air conditioning machines, due to lack of a strong airtight structure, unstable bearings, and inability to use high-airtight metal casings and piping, leading to durability and noise issues.
Innovation Solution
A centrifugal pump design featuring a rotating blade member with a rotor magnet, a metallic main body casing with sealed connections using welding, soldering, or adhesion, and synthetic resin bearings for improved durability and silence, allowing for high-airtight metal casings and piping, and enabling operation under non-lubrication conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional centrifugal pump structure is used, then the pump can be manufactured with simple structure, but the air-tight structure and sealing performance are insufficient for high-pressure applications
Solution Approach 1:
The main body casing is divided into an upper main body casing and a lower main body casing that are separately manufactured and then joined together through welding or adhesion. This segmentation allows for better sealing performance and structural strength while maintaining manufacturing feasibility, directly addressing the air-tight structure requirement for high-pressure applications.
2Reliability
If heating fixation such as welding and soldering is applied, then high air-tight metal casing and piping can be used, but the coil portion cannot be detached for maintenance
Solution Approach 1:
The pump is divided into distinct segments: the main body casing (upper and lower parts) that uses welding or adhesion for high air-tight performance, and the coil portion that is detachably connected. This allows the casing to maintain high sealing performance while the coil can be removed for maintenance, resolving the contradiction between air-tight structure and ease of repair.
3Reliability
If bearing is disposed on one side of the shaft, then the structure is simple, but the bearing stability and durability are poor
Solution Approach 1:
The bearing structure uses asymmetric positioning with the upper bearing member located higher on the shaft than the lower bearing member, creating an optimized load distribution pattern that improves bearing stability and durability while maintaining structural efficiency.
4Device complexity
If bearing operates in fluid without lubricant, then the structure is simple without lubrication system, but the axial member and impeller wear out quickly
Solution Approach 1:
The bearing components (upper and lower bearing members) are made from composite materials or materials with high sliding ability that provide both wear resistance and fluid compatibility. This allows the bearing to operate directly in the fluid without additional lubrication systems while maintaining component durability through the inherent properties of the materials used.
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 a stable and durable centrifugal pump with improved sealing, reduced noise, and maintained performance under high-pressure and air-tight conditions, enabling effective fluid handling in demanding applications.
Implementation Method 1
a rotor magnet disposed under the impeller, and a coil portion which is disposed as to be located in periphery of the rotor magnet and rotates the rotating blade member
Implementation Method 2
a centrifugal pump comprising a rotating blade member including an impeller... a metallic suction side coupling member which is disposed as connected to the main body casing to introduce a fluid into the impeller, and a metallic discharge side coupling member which is disposed as connected to the main body casing to exhaust the fluid by rotating of the impeller
Data Source
AI summary
A centrifugal pump includes a main body casing. The main body casing includes an upper main body casing, a lower main body casing fixed to the upper main body casing, and a blade casing. In the blade casing, an interior space S1 formed by the upper main body casing and the lower main body casing is partitioned, and a fluid introducing passage is formed on the upper portion and a rotating accommodating space S2 to accommodate the rotating blade member is formed on lower portion. A joint portion of the upper main body casing, the lower main body casing, and the blade casing is fixed on the state of sealing. A joint portion of the suction side coupling member and the main body casing and a joint portion of the discharge side coupling member and the main body casing 34 are fixed on the state of sealing.