Dual spindle helical spindle pump with a single-entry design
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Solution Overview
Problem
Screw pumps face difficulties in pumping highly viscous, non-flowing media due to the inability of media to reach delivery chambers and the challenges of cleaning mechanical seals, especially in the food sector where extruders are costly and hard to clean.
Innovation Solution
Integration of an extruder section within the pump housing with extruder screws having a pitch identical to conveyor screws, a hydraulic separation via lip seal, and a feed hopper to facilitate easy introduction of media, reducing dead spaces and eliminating the need for external extruders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If external extruders are connected in front of the pump to pump highly viscous non-flowing media, then the pump can convey such media, but the investment costs increase and cleaning becomes difficult
Solution Approach 1:
The extruder function is merged with the pump by integrating an extruder section directly into the pump housing. The extruder screws are mounted on the same shafts as the conveyor screws, combining both functions into a single integrated unit, eliminating the need for separate external extruders
Solution Approach 2:
The shafts are designed to accommodate both extruder screws and conveyor screws, allowing the same mechanical structure to perform multiple functions - extruding highly viscous media and conveying it through the pump, thereby reducing overall system complexity and cost
2Adaptability or versatility
If mechanical seals are used between pump section and bearing section, then reversible pumping is enabled, but dead spaces are created where material remains making cleaning difficult
Solution Approach 1:
The mechanical seal is replaced with a lip seal that eliminates dead spaces. The lip seal design allows the sealing function to be maintained while removing the problematic dead space areas where material would otherwise remain and difficult to clean
Solution Approach 2:
The sealing mechanism is changed from mechanical seals to lip seals, altering the sealing parameter configuration to eliminate dead spaces while maintaining the reversible pumping capability through proper seal positioning and design
3Volume of stationary object
If the width of screw thread is reduced to maintain larger delivery chambers, then delivery chamber volume increases, but the gradient may change
Solution Approach 1:
The screw thread width is varied locally - narrower in the extruder section to create larger delivery chambers, while maintaining appropriate dimensions in the conveyor section to preserve the gradient and conveying efficiency. This localized variation optimizes both chamber volume and flow characteristics
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
Enables efficient pumping of highly viscous media while simplifying the design and reducing maintenance costs by minimizing dead spaces and eliminating the need for external extruders, allowing for effective operation with sticky media.
Implementation Method 1
two shafts arranged conveyor screws with flanks are provided, the shafts being mounted in the bearing section and extending into the gear section... During the rotation of the shafts and thus the conveyor screws, the medium to be pumped is moved from the inlet to the outlet in these delivery chambers
Implementation Method 2
there is a hydraulic separation between the pump section and the bearing section or the extruder section and the bearing section, preferably via a lip seal
Data Source
Figure 1~2
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AI summary
The invention relates to a twin-spindle screw pump (10) in a single-flow design with a pump housing (11) comprising a pump section (12), a bearing section (16), and a gearbox section (17) with a gearbox chamber (32), wherein the bearing section (16) and the pump section (12) are separate from each other, with a conveying housing part (13) as a component of the pump section (12) in which two conveying screws (24, 25) with flanks (42, 43) arranged on shafts (22, 23) are provided, wherein the shafts (22, 23) are supported in the bearing section (26) (external bearing) and extend into the gearbox section (17). The object of the invention is to improve the aforementioned pump in such a way that highly viscous, non-flowing media can be pumped.The problem is solved by the pump housing (11) having an extruder section (14) which is connected to the pump section (12), by providing an extruder housing part (15) through which the shafts (22, 23) extend, and by providing extruder screws (27, 28) with flanks (50, 51) on the shafts (22, 23).