Spray Device Sealing Contours for Leakage Prevention
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Solution Overview
Problem
Existing spray devices for watering green spaces are not user-friendly due to issues with residual liquid leakage and pressure peaks during spray pattern changes, leading to unwanted wetting and potential malfunction perceptions.
Innovation Solution
A spray device with a sealing system that includes a spray position sealing contour, a residual liquid sealing contour, and a spray position change sealing contour, which ensures a sealed flow connection between the supply channel and nozzle elements, preventing liquid escape and facilitating smooth spray pattern changes by maintaining a sealed connection between the housing and spray unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the spray unit is moved relative to the housing to change spray positions, then different spray patterns can be selected, but residual liquid may escape between the housing and spray unit causing unwanted wetting
Solution Approach 1:
The sealing device is divided into multiple sealing contours: a spray position sealing contour that seals the active spray channel, and a residual liquid sealing contour that seals all feed channels. This segmentation allows different sealing zones to handle different functions - preventing both active spray leakage and residual liquid leakage simultaneously while enabling spray pattern changes.
Solution Approach 2:
The sealing device acts as an intermediary element between the housing and spray unit, providing a sealed transition zone. The sealing contours create an intermediate sealing area that prevents residual liquid from escaping during spray position changes, while still allowing the spray unit to move relative to the housing for pattern selection.
2Speed
If the spray position changes quickly between nozzle elements, then spray pattern changes are efficient, but pressure peaks occur causing liquid to spray out
Solution Approach 1:
The residual liquid sealing contour is positioned to seal feed channels before the spray position change is completed. This preliminary sealing action prevents pressure peaks from causing liquid to spray out during the transition, allowing quick spray position changes while eliminating the harmful pressure surge effect.
3Reliability
If multiple sealings are provided to prevent liquid escape, then leakage is prevented, but the device structure becomes more complex
Solution Approach 1:
The single sealing device performs multiple sealing functions simultaneously through its different sealing contours. It seals the active spray channel via the spray position sealing contour and seals all feed channels including residual liquid via the residual liquid sealing contour. This multi-functionality achieves comprehensive leakage prevention without requiring multiple separate sealing devices, thus avoiding excessive structural complexity.
Data Source
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AI summary
The invention relates to a spraying device, in particular for irrigating green spaces, comprising a housing (14), in which a provision conduit (26) for liquid is arranged or formed, and a spraying unit (18) for spraying a liquid, which is movably held on the housing (14). Said spraying unit (18) has two or more nozzle elements (46, 48, 50, 52) and two or more supply conduits (54, 56, 58, 60) for liquid associated with a corresponding nozzle element (46, 48, 50, 52) and fluidically connected to said nozzle element (46, 48, 50, 52). The nozzle elements (46, 48, 50, 52) can be used to provide different spraying patterns and the spraying pattern can be changed by moving the spraying unit (18) relative to the housing (14), the provision conduit (26) being fluidically connected to the supply conduit (54, 56, 58, 60) associated therewith in a spraying position of the respective nozzle element (46, 48, 50, 52). The aim of the invention is to provide a spraying device of the above type which is more user-friendly. For this purpose, a sealing device (74) forms a spraying position sealing contour (112) which borders, in a spraying position sealing region (126), an outlet opening (86) of the provision conduit (26) and, in the spraying position of the respective nozzle element (46, 48, 50, 52), the inlet opening (62, 64, 66, 68) of the supply conduit (54, 56, 58, 60) associated therewith to provide a sealed fluid connection. The inlet opening (62, 64, 66, 68) of a corresponding other supply conduit (54, 56, 58, 60) is located outside the spraying position sealing region (126). The sealing device (74) forms a residual liquid sealing contour (110) which borders the inlet opening (62, 64, 66, 68) of the at least one further supply conduit (54, 56, 58, 60) in a residual liquid sealing region (128) to provide a seal between the housing (14) and the spraying unit (18).