Centrifugal Pump Modular Seal and Bearing Assembly
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Solution Overview
Problem
Conventional centrifugal pumps for hot media require extensive downtime and labor to replace worn mechanical seals and bearings, as the entire pump must be dismantled and cooled, which is time-consuming and inefficient.
Innovation Solution
A compact modular unit combining a mechanical seal and a bearing allows for quick replacement and service-friendly operation, enabling assembly and disassembly from the cold side of the pump without removing the bearing bracket, reducing cooling time and maintaining insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the entire pump is dismantled to replace mechanical seals and bearings, then the wear parts can be replaced, but the maintenance time and labor are excessive
Solution Approach 1:
The pump is divided into functional modules: a hot side module (pump housing, impeller, hot medium flow path) and a cold side module (mechanical seal, bearing, drive connection). The cold side module can be detached and replaced independently without dismantling the hot side, enabling rapid maintenance of wear parts while preserving the insulated hot medium section.
Solution Approach 2:
The mechanical seal and bearing are extracted from the traditional integrated pump structure and positioned in a separate cold side module that interfaces with the hot side through a thermal barrier. This extraction allows the wear parts to be serviced independently from the hot pump housing, eliminating the need to cool down and dismantle the entire pump.
2Ease of repair
If the pump is cooled down for maintenance, then the mechanical seal and bearing can be replaced, but the cooling process is time-consuming
Solution Approach 1:
The pump design creates a local thermal environment where the mechanical seal and bearing operate in a cooled zone separated from the hot pump housing by a thermal barrier. This localized temperature differentiation allows maintenance personnel to access and replace wear parts in a cool environment while the hot medium continues to circulate in the insulated pump housing, eliminating the need for system-wide cooling.
3Ease of repair
If the bearing bracket is removed for maintenance, then the mechanical seal and bearing can be accessed, but the insulation must be removed and reinstalled
Solution Approach 1:
The pump design creates an asymmetric maintenance approach where the cold side module (containing mechanical seal and bearing) is designed for easy detachment from the hot side, while the hot side pump housing with insulation remains intact. The asymmetry in module design allows selective replacement of wear parts without disturbing the insulated hot medium section, eliminating the need to remove and reinstall insulation.
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 significantly reduces maintenance time, enhances operational reliability, tightness, and efficiency, while extending the pump's service life and reducing costs.
Implementation Method 1
a housing arrangement for heat dissipation, which serves as a distance for temperature reduction
Implementation Method 2
The aim is to keep the flow of heat from the pump housing to the shaft seal chamber as low as possible
Data Source
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AI summary
The invention relates to a centrifugal pump for conveying hot media. The centrifugal pump comprises at least one impeller wheel (9) which is mounted in a pump housing (1). The impeller wheel (9) is set in rotation by a drive via a shaft (7). A housing assembly (4) for dissipating heat adjoins the pump housing (1). The shaft (7) is provided with a face seal assembly (16). The shaft (7) is also supported with at least one bearing (10, 25). According to the invention, the centrifugal pump comprises a compact module (15) in the form of an assembly unit. The module (15) comprises at least one face seal assembly (26) and at least one bearing (25).