Pump Shaft Sealing Arrangement With Nested Leakage Lines
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Solution Overview
Problem
Existing sealing arrangements in pumps require separate leakage lines for throttle and seal leakage flows, leading to increased installation costs and aesthetic issues due to visible lines, as well as challenges in preventing back pressure in the seal leakage line.
Innovation Solution
The seal leakage line runs through the interior of the throttle leakage line, creating a jet pump effect that prevents back pressure and ensures reliable dissipation of leakage flow, allowing both lines to be laid in one operation and reducing external visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate leakage lines are used for throttle and seal leakage flows, then the leakage flows can be reliably discharged, but the installation effort and cost increase
Solution Approach 1:
The seal leakage line is nested within the throttle leakage line, with the seal leakage line running through the interior of the throttle leakage line. This nesting arrangement allows both leakage lines to be laid in one operation, reducing installation effort while maintaining separate discharge paths for both leakage flows
Solution Approach 2:
The installation of both leakage lines is merged into a single operation by routing the seal leakage line through the throttle leakage line. This combining of installation steps reduces the number of separate operations required while maintaining the functional separation of the two leakage lines
2Reliability
If two separate leakage lines are used for throttle and seal leakage flows, then the leakage flows can be reliably discharged, but the number of visible lines increases
Solution Approach 1:
The seal leakage line is nested within the throttle leakage line, so that from the outside only one line (the throttle leakage line) is visible. This nesting arrangement improves the appearance of the pump by reducing the number of visible lines while maintaining separate discharge paths for both leakage flows
3Ease of manufacture
If the seal leakage line is connected to the throttle leakage line, then installation is simplified, but back pressure may occur in the seal leakage line
Solution Approach 1:
The outlet opening of the seal leakage line is positioned upstream of the outlet opening of the throttle leakage line, creating a preliminary arrangement that uses the flowing medium in the throttle leakage line to generate a jet pump effect. This preliminary positioning prevents back pressure from developing in the seal leakage line
Solution Approach 2:
The flowing medium in the throttle leakage line creates a jet pump effect through hydraulic principles. The movement of the medium generates a suction effect that actively prevents back pressure in the seal leakage line and even creates a positive flow condition, ensuring reliable dissipation of the leakage flow
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 solution simplifies installation, reduces costs, and enhances the appearance of the pump by using a single set of lines, while ensuring reliable drainage of leakage flows through the jet pump effect, maintaining atmospheric pressure at the seal leakage line outlet.
Implementation Method 1
the flow in the throttle leakage line results in a jet pump effect, which not only creates a back pressure in the Seal leakage line reliably prevented, but on the contrary even generates a certain suction that ensures reliable dissipation of the leakage flow from the low-pressure chamber
Data Source
Figure 1
AI summary
The invention relates to a sealing arrangement on a pump shaft, comprising: a restrictor section (18) which is arranged along the shaft (16) and divides a high-pressure chamber (12) of the pump from a sealing chamber (20); a seal (22) arranged on the shaft (16) and between the sealing chamber (20) and a low-pressure chamber (30); a restrictor leakage line (34) leading from the sealing chamber (20) to the exterior; and a seal leakage line (42) leading from the low-pressure chamber (30) to the exterior. The sealing arrangement is characterised in that a section of the seal leakage line (42) runs through the interior of the restrictor leakage line (34).