Vacuum Pump Cooling Pipe Embedded in Cast Iron Housing
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Solution Overview
Problem
Existing vacuum pumps face challenges in achieving a simple and highly efficient cooling structure, particularly in compact designs, where the housing tends to overheat during long operations of screw rotors, and existing cooling methods are either complex or inefficient.
Innovation Solution
A vacuum pump design featuring a cast iron housing with a stainless steel cooling pipe that is sensitized on its outer surface, allowing for direct and efficient heat transfer, and a configuration where the cooling pipe is embedded within the housing to sandwich the screw rotors, providing uniform cooling without the need for additional greasing or complex configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air cooling or water cooling is used to cool the housing, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The cooling pipe is integrated directly into the housing structure, merging the cooling function with the housing itself. This eliminates the need for separate cooling systems while maintaining effective heat dissipation, thus improving cooling efficiency without increasing device complexity
Solution Approach 2:
A cooling pipe filled with cooling medium (water or oil) is introduced as an intermediary between the housing and the heat source. The cooling pipe absorbs heat from the housing through thermal conduction, effectively reducing housing temperature while maintaining a simple structural design
2Reliability
If the cooling pipe is made of stainless steel, then corrosion resistance is improved, but heat transfer efficiency decreases
Solution Approach 1:
The cooling pipe is constructed as a composite structure with an inner stainless steel layer for corrosion resistance and an outer aluminum layer for high thermal conductivity. This composite material approach combines the advantages of both materials: the stainless steel provides durability and corrosion resistance, while the aluminum enhances heat transfer efficiency
Solution Approach 2:
Different portions of the cooling pipe have different material properties optimized for their specific functions. The inner surface is made of stainless steel to resist corrosion from cooling medium, while the outer surface is made of aluminum to maximize heat dissipation to the housing, creating local quality optimization throughout the structure
3Temperature
If the cooling pipe is embedded in the housing, then cooling efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The cooling pipe is pre-formed with the required shape and dimensions before being integrated into the housing. This preliminary preparation of the cooling pipe allows for easier assembly and reduces manufacturing complexity, while still achieving effective thermal contact with the housing for high cooling efficiency
4Temperature
If the cooling pipe contacts the housing directly, then heat transfer is improved, but sensitization of the stainless steel occurs
Solution Approach 1:
The cooling pipe uses a composite structure where the stainless steel inner layer is protected from direct contact with the housing, preventing sensitization. The aluminum outer layer serves as the contact surface with the housing, allowing efficient heat transfer while the stainless steel remains protected from thermal exposure that would cause sensitization
Solution Approach 2:
The aluminum outer layer acts as an intermediary between the stainless steel inner layer and the housing. It transfers heat from the housing to the cooling medium while protecting the stainless steel from direct thermal contact, thereby preventing sensitization while maintaining heat transfer efficiency
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 design achieves efficient cooling of the pump housing, maintaining thermal stability and preventing corrosion, while maintaining a compact and cost-effective structure by ensuring the cooling pipe remains in close contact with the housing, enhancing the overall cooling efficiency and productivity.
Implementation Method 1
the outer circumferential surface, which is in close contact with the pump housing, is constituted by a sensitized layer
Implementation Method 2
it is important to put the cooling pipe made of stainless steel into uniform close contact with the housing and inhibit an inner circumferential surface of the cooling pipe made of stainless steel from being sensitized
Data Source
AI summary
A vacuum pump according to an embodiment of the present invention includes a pump housing and a cooling pipe. The pump housing is constituted by cast iron. The cooling pipe includes an outer circumferential surface and an inner circumferential surface and is constituted by stainless steel. The cooling pipe passes through the pump housing and the outer circumferential surface which is in close contact with the pump housing, is constituted by a sensitized layer. This vacuum pump is formed such that the pump housing constituted by cast iron is casted around the cooling pipe constituted by stainless steel. The sensitized layer is provided on the outer circumferential surface of the cooling pipe, the sensitized layer is in contact with the pump housing, and the pump housing is efficiently cooled.