Vacuum blower
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Solution Overview
Problem
Conventional vacuum blowers face challenges in increasing air flow rate during sucking work and delivering rectilinearly directed wind during blowing work, while also requiring a large amount of sliding motion for quick switching between modes.
Innovation Solution
A vacuum blower design featuring a nozzle with a slidable inner pipe and cam mechanism allows for efficient switching between sucking and blowing states by adjusting ejection ports, enhancing air flow and initial velocity during suction and directing wind rectilinearly during blowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressurized wind is ejected to the discharge port along the periphery of the front pipe, then the vacuum blower can perform sucking work, but the air flow rate and initial velocity of sucked objects near the suction port cannot be increased
Solution Approach 1:
The nozzle is divided into an inner pipe and an outer pipe, creating separate flow paths. The inner pipe directs pressurized wind along the central axis to the suction port, while the outer pipe handles discharge flow, enabling independent optimization of sucking and blowing functions
Solution Approach 2:
The invention introduces a radial dimension to the flow path by using concentric pipes. Pressurized wind is injected radially inward through the inner pipe to create high-velocity core flow, while discharge flow moves radially outward, creating a three-dimensional flow structure that enhances suction performance
2Adaptability or versatility
If the front pipe is slid to switch between sucking and blowing modes, then mode switching is achieved, but a large amount of sliding motion is required which slows down the switching speed
Solution Approach 1:
Instead of sliding the front pipe to switch modes, the invention inverts the approach by using a rotatable nozzle assembly that changes flow direction through rotation. This reduces the switching mechanism from linear sliding to rotational movement, enabling faster mode transitions
Solution Approach 2:
The nozzle assembly is designed to be rotatable rather than fixed or linearly movable. This dynamic configuration allows rapid switching between sucking and blowing modes by rotating the nozzle 180 degrees, reducing the mechanical travel distance and switching time compared to sliding mechanisms
3Productivity
If pressurized wind is ejected circumferentially to the front end along the periphery of the front pipe, then the vacuum blower can perform blowing work, but rectilinearly directed wind cannot be delivered
Solution Approach 1:
The inner pipe creates a localized high-velocity jet along the central axis, concentrating the pressurized wind into a focused stream. This local concentration of flow energy delivers rectilinearly directed wind for effective blowing work, while the outer pipe handles the circumferential discharge 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
The design increases air flow volume and initial velocity during suction, delivers rectilinearly directed wind during blowing, and reduces the required sliding motion for quick mode switching.
Implementation Method 1
The pressurized wind ejected from the ejector 40A passes through the inside of the pipe 10 along the inner surface of the pipe 10 and is ejected to the discharge port 10B. This pressurized wind causes the pressure inside the pipe 10 to be lowered, thereby to generate suction flow (negative pressure) in the pipe 10 from the suction port 10A toward the discharge port 10B.
Implementation Method 2
a sucking state, where a base end portion of the inner pipe comes into close contact with a base end portion of the nozzle facing the base end portion of the inner pipe, a front end portion of the inner pipe is separated from a front end portion of the nozzle facing the front end portion of the inner pipe, and the pressurized wind generated by the blower fan and fed to an outside of the inner pipe is ejected to the discharge port along an inside of the inner pipe
Implementation Method 3
a blowing state, where the front end portion of the inner pipe comes into close contact with the front end portion of the nozzle facing the front end portion of the inner pipe, the base end portion of the inner pipe is separated from the base end portion of the nozzle facing the base end portion of the inner pipe, and the pressurized wind generated by the blower fan and fed to the outside of the inner pipe is ejected to the suction port along the inside of the inner pipe
Data Source
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AI summary
Provided is a vacuum blower, when used as a vacuum for sucking work, capable of increasing air flow with a larger volume of air sucked from a suction port and increasing the initial velocity (sucking rate) of sucked objects near the suction port, and when used as a blower for blowing work, capable of delivering rectilinearly directed wind from the blowing port and quickly switching between sucking work and blowing work. By sliding an inner pipe 14 disposed inside a pipe 10 relative to the pipe 10, opposite end portions of the inner pipe 14 come into close contact with opposite end portions (turn portions 15, 16) of a nozzle 40 facing the opposite end portions of the inner pipe 14, such that one ejection port (42, 43) is closed and the other ejection port (43, 42) is opened to allow pressurized wind generated by a blower fan 20 to be ejected along the inside of the inner pipe 14 to switch between sucking state and blowing state.