Suction and separation composite tube, and suction cleaning machine and harvesting machine using same
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Solution Overview
Problem
Conventional suction cleaning machines face damage and clogging issues when attempting to separate lightweight and heavy objects due to complex structures and high manufacturing costs, particularly when trying to prevent heavy items from entering the fan casing.
Innovation Solution
A suction and separation composite tube with a combination of a suction tube portion and a separation tube portion, where the flow velocity of airflow decreases at their combining portion, allowing objects of different specific gravities to be separated effectively, with a larger cross-sectional area in the separation tube portion to direct heavy objects away from the fan intake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional suction cleaning machines attempt to suck in heavy and hard items such as stones and tree branches, then the suction capability is improved, but damage to or breakage of the fan and fan casing occurs
Solution Approach 1:
The suction tube is divided into two distinct portions: a suction tube portion for drawing in objects and a separation tube portion for separating heavy objects from the airflow. This segmentation allows the system to maintain high suction capability while preventing heavy objects from reaching the fan, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The separation tube portion performs preliminary separation of heavy objects before they can enter the fan casing. By creating a flow velocity decrease region at the combining portion, heavy objects are caused to drop out of the airflow in advance, protecting the fan and fan casing from damage while maintaining the ability to suction various objects
2Manufacturing precision
If complex separation structures are used to separate lightweight and heavy objects, then separation effectiveness is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The suction tube and separation tube are combined into a single integrated tube structure where the suction tube portion and separation tube portion work together. This merging achieves effective separation of lightweight and heavy objects without requiring separate complex separation devices, thus improving separation effectiveness while maintaining simple structure and low manufacturing costs
Solution Approach 2:
The system utilizes the natural difference in specific gravity between lightweight and heavy objects, combined with the flow velocity decrease at the combining portion, to achieve automatic separation without requiring additional complex mechanisms. The structure serves itself by using the airflow dynamics and object properties to perform the separation function
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 composite tube effectively separates lightweight and heavy objects, reducing the likelihood of clogging and damage to the fan, while maintaining low manufacturing costs and improved operability.
Implementation Method 1
a suction tube portion (14) which includes, at an open distal end, a suction port (14a) communicated with outside air to suck objects therefrom
Implementation Method 2
a flow velocity of airflow involving objects that have been sucked from the suction port decreases at a combining portion (15) between the suction tube portion (14) and the separation tube portion (13), and thereby the airflow involving the sucked objects changes at the combining portion (15)
Data Source
AI summary
Provided is a suction and separation composite tube, and a suction cleaning machine and a harvesting machine using the same, which are highly cost effective and are capable of, with a relatively simple structure to keep the manufacturing costs low, separating items of relatively small specific gravity from items of relatively large specific gravity even if the output of a motor is set high, and thus reducing the likelihood of clogging or the like of sucked objects and effectively preventing damage to or breakage of a fan and a fan casing. The suction and separation composite tube includes a connecting tube portion, a suction tube portion, and a separation tube portion. The suction tube portion or the separation tube portion is integrally continuous with the connecting tube portion at a distal end thereof. The suction tube portion and the separation tube portion are combined together at an intermediate portion or proximal end portion thereof. Using the fact that the flow velocity of airflow involving sucked objects that have been sucked from a suction port decreases at a combining portion, the sucked objects are separated into items of relatively small specific gravity and items of relatively large specific gravity.