Split Mechanical Seal Housing for Eccentric Screw Pump Maintenance
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Solution Overview
Problem
Existing eccentric screw pumps require complex disassembly of the pump housing and connected piping systems to replace or maintain the mechanical seal, leading to inefficient maintenance and repair processes.
Innovation Solution
The mechanical seal is designed with a split sealing housing comprising a base housing and a detachable housing cover, allowing the connecting shaft with the sliding ring to be removed axially without disassembling the pump housing or piping, and the counter ring is detachably attached to the housing cover, facilitating easy maintenance and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mechanical seal is integrated into the pump housing with a solid sealing housing, then the seal provides reliable liquid-tight separation, but the maintenance and replacement of the seal require complex disassembly of the pump housing and piping systems
Solution Approach 1:
The sealing housing is divided into two separate parts: a stationary base housing that remains attached to the pump housing, and a movable housing cover that can be detached. This segmentation allows the housing cover to be removed independently for seal maintenance while the base housing and pump system remain intact, resolving the contradiction between reliable sealing and ease of repair.
2Stability of the object's composition
If the housing cover is permanently attached to the base housing, then the mechanical seal maintains stable positioning, but the connecting shaft cannot be removed for maintenance without disassembling the entire pump housing
Solution Approach 1:
The detachable connection between the housing cover and base housing enables the housing cover to be separated for maintenance operations. The coupling elements allow the connecting shaft to be removed through the opening in the housing cover without disassembling the entire pump housing, while maintaining stable positioning during operation.
Solution Approach 2:
The housing cover acts as an intermediary component that provides access to the connecting shaft and mechanical seal. By detaching the housing cover, maintenance personnel can access and remove the connecting shaft without affecting the stable positioning provided by the base housing and overall pump structure.
3Device complexity
If the mechanical seal is designed as a single integrated component, then the structure is simple and robust, but the cost of maintenance and repair is high due to extensive disassembly requirements
Solution Approach 1:
While maintaining a relatively simple overall structure, the sealing housing is segmented into a base housing and housing cover that can be separated. This allows quick access to the mechanical seal and connecting shaft for maintenance, significantly reducing downtime and repair costs without adding substantial structural complexity.
Data Source
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AI summary
The invention relates to a progressive cavity pump, comprising at least a stator (1), a rotor (2), which rotates in the stator, a drive (3) for the rotor, a pump housing (4), which is connected to the stator (1) and which has at least one inlet or outlet opening (6) for the medium to be pumped, a connection housing (14), which is arranged between the pump housing (4) and the drive (3) and which is open or is to be opened, a connection shaft (9), which is detachably connected to the drive (3) and which is at least partly arranged in the connection housing (14). The connection shaft (9) is sealed by means of a (preferably single-acting) slide ring seal (13) in order to separate the pump housing (4) liquid-tight from the surroundings or from the connection housing. The slide ring seal (13) has a seal housing (18), which is fastened to the pump housing (4) and/or the connection housing (14), a slide ring (19), which is fastened to the connection shaft (9) for conjoint rotation and rotates in the seal housing (18), and a stationary counter ring (20), which is fastened to the seal housing (18). The pump is characterized in that the seal housing (18) is designed as a divided seal housing and comprises a main housing (18a), which in the assembled state surrounds the slide ring (19) and is fastened to the pump housing (4) and/or the connection housing (14), and a housing cover (18b), which bears the counter ring (20) and is detachably fastened to the main housing (18a) and can be separated therefrom.