Constant Diameter Bore Cartridge for High Pressure Pumps

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Solution Overview

Problem

Existing high-pressure water pumps face challenges in maintaining efficiency and reducing costs at extreme pressures, often requiring complex designs with shoulders in the bore that increase stress and manufacturing costs.

Innovation Solution

The cartridge assembly for high-pressure pumps features a bore with a constant diameter from the valve end to the packing end, eliminating the need for a shoulder and incorporating a retainer flange for easy access and reduced manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a bore with shoulders is used in existing high-pressure pumps, then the pump can maintain structural integrity at extreme pressures, but the stress concentration and manufacturing costs increase

Engineering Contradiction:

Improvestructural integrityVSAvoidmanufacturing costs

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent removes the shoulder feature from the bore design, extracting the stress-concentrating element while maintaining structural integrity through alternative design means. The constant diameter bore eliminates the need for shoulders, directly reducing manufacturing complexity and costs while preserving the pump's ability to withstand extreme pressures.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the geometric parameters of the bore from a stepped design with shoulders to a constant diameter design. This parameter change eliminates stress concentration points while maintaining the structural strength required for high-pressure operation, thereby reducing manufacturing costs and improving ease of manufacture.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a complex design with shoulders in the bore is used, then the pump can withstand extreme pressures, but the device complexity and manufacturing costs increase

Engineering Contradiction:

Improvepressure withstanding capabilityVSAvoidbore design complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the shoulder feature from the bore design, simplifying the overall device complexity while maintaining the reliability needed to withstand extreme pressures. The constant diameter bore reduces the number of geometric features and potential failure points.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of adding shoulders to the bore to handle pressure, the patent inverts the approach by using a constant diameter design without shoulders, achieving pressure withstanding capability through a simpler geometric configuration.

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If a constant diameter bore is used, then manufacturing costs and stress are reduced, but the pump package size may increase

Engineering Contradiction:

Improvemanufacturing costsVSAvoidpump package size

Core Design Contradiction:

Ease of manufactureVSVolume of moving object

Solution Approach 1:

The patent changes the bore geometry from stepped to constant diameter, which simplifies manufacturing and reduces stress. The constant diameter design allows for more efficient material distribution and potentially smaller overall pump dimensions despite the uniform bore throughout its length.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12313063B2High pressure water pump fluid end

Publication Date: 2025.05.27 NEW LANTAO BUS

AI summary

A cartridge assembly for use in a high pressure pump according to an exemplary aspect of the present disclosure includes, among other things, a cartridge housing. A bore extends through the cartridge housing from a valve end to a packing end. A valve assembly is arranged in the valve end of the bore and configured to abut a valve seat. The bore has a constant diameter between the valve assembly and the packing end. The cartridge assembly is designed to be used in a fluid pump at a fluid pressure of at least 30,000 psi.