Rotary Nozzle Insert for High-Pressure Cleaning Speed Control
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Solution Overview
Problem
High-speed rotation of the nozzle body in rotor nozzles for high-pressure cleaning devices leads to the liquid jet fanning out, reducing cleaning effectiveness, and existing solutions to limit speed, such as inserts with slot-shaped recesses, can cause unintended movement and damage due to pressure fluctuations.
Innovation Solution
A non-rotatable and axially immovable connection between the insert part and the housing, with flow resistance elements that slow down the liquid flow without impairing the nozzle body's start-up behavior, ensuring the nozzle body rotates at a controlled speed to maintain jet focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the nozzle body rotates at high speed around the longitudinal axis of the housing, then a larger area can be exposed to liquid, but the jet of liquid fans out and cleaning effect is reduced
Solution Approach 1:
The patent changes the rotational speed parameter of the nozzle body by introducing flow resistance elements that increase liquid flow resistance, thereby reducing the rotational speed and preventing jet fanning out while maintaining a reasonable cleaned area
2Speed
If an insert with slot-shaped recesses is inserted into the housing to slow down liquid flow, then the nozzle body rotation speed is reduced, but the insert can rotate unintentionally and cause damage
Solution Approach 1:
The patent performs preliminary action by providing flow resistance elements that are fixedly connected to the housing before operation, eliminating the risk of unintentional rotation during use while still achieving the desired flow control and speed reduction
Solution Approach 2:
The patent extracts the problematic rotational freedom of the insert and replaces it with a fixed connection, removing the source of reliability issues while preserving the flow control function through the flow resistance elements
3Stress or pressure
If pressure fluctuations occur in the liquid, then the insert may move axially relative to the housing, but this leads to damage and reduced service life
Solution Approach 1:
The patent applies preliminary anti-action by providing a fixed connection between the flow resistance elements and the housing that prevents axial movement before pressure fluctuations can cause damage, thereby protecting against reliability issues caused by pressure variations
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 solution effectively limits the nozzle body's rotational speed, preventing the liquid jet from fanning out and enhancing cleaning effectiveness while preventing unintended movement and damage, thus extending the nozzle's service life and maintaining mechanical stability.
Implementation Method 1
The liquid entering the housing tangentially presses the nozzle body into the pan-shaped recess, which forms a bearing for the nozzle body, and at the same time the nozzle body is rotated about the longitudinal axis of the housing
Implementation Method 2
Liquid under pressure, preferably water, can be supplied to the inlet of the housing from a high-pressure cleaning device. The liquid entering the housing tangentially presses the nozzle body into the pan-shaped recess
Implementation Method 3
The insert according to the invention forms flow resistance elements that slow down the circulating movement of the liquid within the housing in the area of the flow resistance elements
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Disclosed is a rotary nozzle (10) for a high-pressure cleaning device, comprising a housing (12) that has at least one tangentially extending inlet (18) and an outlet (22) which is located on an end wall (24) and on which a pot-shaped, centrally open depression (30) is located, and comprising a nozzle member (62) which is disposed in the housing (12) and has a continuous duct (72) and a spherical end (64) of which is supported in the pot-shaped depression (30); the nozzle member (62) is made to rotate about the longitudinal axis (26) of the housing (12) by the liquid flowing through the housing (12); the rotary nozzle (10) further comprises an insertion piece (46) that can be inserted into the housing (12), is supported on the wall of the housing (12), and forms a plurality of flow resistance elements (50) which are spread across the circumferential direction of the insertion piece (46). In order to further develop the rotary nozzle (10) in such a way as to make it less sensitive to pressure variations of the liquid and increase its service life, the insertion piece (46) can be connected to the housing (12) so as to rotate therewith and be axially immobile.