Discharge Casing Insert for Pump Performance Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Classic venturi designs for pumps are difficult to manufacture due to machining deviations caused by long drilling with small drill bits, leading to performance issues and costly rework, and they limit throat size changes, which can result in performance degradation over time.
Innovation Solution
A new discharge casing insert that allows for larger bores and interchangeable throat area configurations, reducing manufacturing defects and enabling easy performance adjustments by replacing the insert, thus improving manufacturability and customer control over pump performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If classic venturi designs use long drilling with small drill bits to create discharge passageways, then the passage quality can be improved, but machining deviation increases greatly affecting pump performance and manufacturing yield
Solution Approach 1:
The discharge casing is divided into two parts: a removable insert containing the venturi passage and the main casing body. This segmentation allows the insert to be manufactured separately with precise machining, avoiding the difficulty of long drilling in the traditional design. The insert can be produced with high precision using conventional machining methods without the cumulative errors associated with deep hole drilling.
Solution Approach 2:
The removable insert acts as an intermediary component that contains the complex venturi geometry. Instead of drilling the passage directly into the casing, the insert serves as a pre-manufactured intermediary element that can be inserted into the casing, thereby eliminating the need for difficult long-distance drilling operations while maintaining passage quality.
2Device complexity
If traditional venturi designs are used, then the casing structure is simple, but the throat size cannot be changed without replacing the entire casing
Solution Approach 1:
The removable insert design transforms the static, fixed throat size into a dynamic, changeable configuration. The insert can be removed and replaced with different inserts having different throat sizes, allowing the pump performance to be adjusted without modifying the main casing structure. This provides adaptability while keeping the overall device complexity low.
Solution Approach 2:
The main casing is designed with a universal interface that can accommodate multiple different inserts with varying throat sizes. This universal design allows a single casing to serve multiple functions by simply changing the insert, thereby providing throat size variability without requiring multiple different casing designs.
3Duration of action of stationary object
If the discharge casing throat experiences wear over time, then the effective throat area increases causing performance changes, but replacing the entire casing is costly
Solution Approach 1:
The insert is designed as a replaceable, lower-cost component compared to the entire casing. When wear occurs in the throat, only the insert needs to be replaced rather than the expensive casing. This approach treats the insert as a consumable or replaceable component, significantly reducing repair costs and extending the overall service life of the pump system.
Solution Approach 2:
The worn insert can be discarded or sent for reconditioning while the main casing is retained and reused. This selective replacement strategy allows the valuable casing to be recovered and used again, extending its service life without the need to replace the entire assembly, thereby reducing overall maintenance costs.
4Manufacturing precision
If larger bores are used to receive the discharge casing insert, then manufacturing defects are reduced, but the throat area must be contained within the insert
Solution Approach 1:
By segmenting the throat area containment into a separate insert component, the main casing can be manufactured with a larger, more easily machined bore that is less prone to manufacturing defects. The complex throat geometry is confined to the insert, which can be manufactured with appropriate precision using standard machining practices, while the casing benefits from reduced drilling depth and improved manufacturing quality.
Data Source
AI summary
Apparatus, e.g., including a pump or rotary device, having a discharge casing and a discharge casing insert. The discharge casing may be configured with a discharge flow pathway for providing a flow of effluent being pumped and discharged, the discharge flow pathway having a discharge flow pathway wall, the discharge casing also configured with a discharge casing insert borehole that passes from an outer surface of the discharge casing through the discharge flow pathway wall. The discharge casing insert may include a discharge casing Venturi plug portion to be received in the discharge casing insert borehole and arranged in the discharge flow pathway, the discharge casing Venturi plug portion configured with a restricted discharge flow pathway for providing a partial obstruction in the discharge flow pathway and the flow of the effluent being pumped and discharged.