Shaft-Sealing Device Coolant Flow Guide
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Solution Overview
Problem
Conventional shaft-sealing devices for pumps suffer from reduced coolant circulation efficiency due to turbulence at the coolant outlet, leading to inadequate cooling of the sealing interface and potential leakage issues.
Innovation Solution
A shaft-sealing device with a seal housing featuring a guide slot and converging section in the inner annular surface, along with a stream guide member, which directs coolant flow to minimize turbulence and enhance circulation, ensuring effective cooling and sealing between the stationary and rotary rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fender is added to guide coolant flow, then coolant direction control is improved, but turbulence is generated at the coolant outlet reducing circulation efficiency
Solution Approach 1:
The patent replaces the conventional flat quadrangular fender with a curved guide surface that follows the natural flow path of the coolant. This curved geometry smoothly redirects the coolant flow without creating abrupt changes in direction, thereby eliminating turbulence while maintaining effective flow guidance into the sealing interface.
Solution Approach 2:
The patent converts the potentially harmful turbulence effect into a beneficial smooth flow pattern by designing the guide surface with optimized curvature. The guide surface transforms the high-velocity coolant jet into a controlled, turbulence-free flow that effectively cools the sealing interface while maintaining high circulation efficiency.
2Reliability
If direct metal-to-metal contact is used between stationary and rotary rings, then sealing engagement is achieved, but wear and heat generation increase
Solution Approach 1:
The patent introduces a hydraulic cooling system where coolant is pumped through channels in the stationary ring and rotary ring, and also through the sealing interface itself. This hydraulic cooling removes friction-generated heat in real-time, allowing sustained metal-to-metal contact for reliable sealing without excessive heat buildup or wear.
3Temperature
If additional cooling and lubricating devices are added, then wear and heat are reduced, but device complexity increases
Solution Approach 1:
The patent merges the cooling function with the sealing structure itself by integrating coolant channels directly into the stationary ring and rotary ring components. The sealing faces and cooling channels are combined in a single integrated assembly, eliminating the need for separate external cooling devices and reducing overall system complexity.
Solution Approach 2:
The stationary ring and rotary ring serve multiple functions simultaneously: they provide sealing engagement through metal-to-metal contact, conduct coolant through internal channels for cooling, and distribute lubricant to the sealing interface. This multi-functionality eliminates the need for separate dedicated cooling and lubricating devices.
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 improves coolant circulation efficiency, reduces friction-induced heat, and maintains a tight seal, promoting safe and efficient operation of the pump by preventing leakage and enhancing the pumping head.
Implementation Method 1
a coolant inlet passage through which a coolant is supplied into the seal space... effectively cooling and sealing between the stationary and rotary rings
Implementation Method 2
the stationary and rotary rings will wear and generate considerable heat during relatively rotational operation at the sealing interface due to direct metal-to-metal contact therebetween
Data Source
AI summary
A shaft-sealing device for a pump includes a seal housing attached to a pump housing in which a rotary shaft is mounted. The seal housing is provided with a coolant inlet passage and a coolant outlet passage, both of which interconnect with a seal space in the seal housing. The coolant outlet passage intersects with the seal space at an opening at which first and second sides are defined according to a flowing direction of a coolant. The seal space includes an inner annular surface having a first section adjacent to the first side of the opening. A guide slot is provided in the first section of the inner annular surface. With a pump ring in the seal housing rotating, the coolant is guided into the seal space via the coolant inlet passage and further discharged from coolant outlet passage through the opening smoothly due to the guide slot.