Alternating Screw Piston Lubrication Pump Design
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Solution Overview
Problem
Existing lubricating pumps for chains and gears are complex and large, making them unsuitable for simple, inexpensive, and space-saving lubrication solutions.
Innovation Solution
A lubricating pump design featuring two screw pistons that alternate between pressure and suction modes, driven by a common transmission with a drive pinion or intermediate gears, and equipped with elastic seals and non-return valves to ensure efficient lubricant delivery without backflow, utilizing a motor with direction reversal control for precise operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricating pumps are used, then lubrication function is achieved, but device complexity and size increase
Solution Approach 1:
The pump is divided into two independent but coordinated screw pistons, each capable of independent suction and pressure phases. This segmentation allows each piston to be simpler in design while the system as a whole achieves continuous lubrication, reducing overall complexity compared to a single complex piston design.
Solution Approach 2:
Two screw pistons are combined in a single pump housing, sharing common components such as the housing, suction chamber, and drive mechanism. This merging reduces the total number of separate components needed, simplifying the overall construction while maintaining reliable continuous lubrication.
2Reliability
If conventional lubricating pumps are used, then lubrication function is achieved, but space consumption increases
Solution Approach 1:
The two screw pistons share a common housing, suction chamber, and drive mechanism, significantly reducing the total volume required compared to two separate pump units. This compact integrated design achieves reliable continuous lubrication while minimizing space consumption.
Solution Approach 2:
The screw pistons are arranged concentrically or adjacently within the same housing volume, with one piston's operational cycle nested in time with the other's, maximizing space utilization and reducing the overall pump footprint while maintaining reliable lubrication function.
3Device complexity
If single screw piston is used, then construction is simpler, but continuous lubrication cannot be achieved
Solution Approach 1:
The two screw pistons operate in alternating periodic cycles, with one piston in suction phase while the other is in pressure phase, and vice versa. This periodic coordination ensures continuous lubrication output without requiring a single complex piston to perform both functions simultaneously, maintaining simple construction while achieving continuous productivity.
Solution Approach 2:
By coordinating the operational phases of two screw pistons so that one is always in pressure mode while the other is in suction mode, the system achieves continuous useful action (lubricant delivery) without interruption, overcoming the limitation of a single piston design while keeping the construction relatively simple.
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 enables simple, cost-effective, and space-efficient lubrication by ensuring continuous operation with alternating screw pistons in pressure and suction modes, enhancing lubricant delivery efficiency and reducing wear on seals, thus improving overall pump performance.
Implementation Method 1
The invention relates to a lubricating pump (1) with two screw pistons (2, 3)... each screw piston (2, 3) has a screw thread (8, 9) which is screwed into a respective nut (12, 13)... the two screw pistons (2, 3) are driven via a common gear (4)... so that alternately one screw piston (2, 3) is in pressure mode and the other screw piston (2, 3) is in suction mode
Implementation Method 2
The screw pistons (2, 3) are provided in their piston end regions with in particular elastic seals, such as preferably O-rings (29), in order to be sealed off in their respective discharge channel (19, 20)
Implementation Method 3
for each screw piston (2, 3), a delivery channel (19, 20) is provided, the outlet of which is provided with a non-return valve (23, 24) in order to prevent lubricant from flowing back into the delivery channel (19, 20) during suction operation of the associated screw piston (2, 3)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a lubricating pump (1), which contains screw pistons (2, 3), of which one is in compression operation and the other is in suction operation in alternation. The invention further relates to a method for supplying lubricant, wherein a first screw piston (2, 3) is in a suction operation while a second screw piston (3, 2) is in a compression operation and vice versa, and wherein the two screw pistons (2, 3) are driven by means of a common gear train (4), which contains one piston gear (6, 7) for each screw piston (2, 3).