Float Switch Using Reed Pipes and Magnet for Reliable Water Level Control
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Solution Overview
Problem
Existing float switches for water pumps have poor sealing properties, short service life, and complex mechanical structures that lead to reliability issues, high production costs, and a high defective rate due to moisture ingress and metal oxidation.
Innovation Solution
A float switch design incorporating a float, a float guide rod, a dry reed pipe detection device, and a relay, with a hollow guide rod housing high-level and low-level dry reed pipes and a magnet, using a glue-pouring sealing method and a simple control circuit with an RC voltage-dropping power supply and protection components to enhance reliability and waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mechanical switches are used in float switches, then the structure can be simple, but the sealing property is poor and service life is short
Solution Approach 1:
The patent replaces the mechanical switch with a magnetic detection system consisting of a magnet in the float and a reed switch in the guide rod. This substitution eliminates direct mechanical contact and sealing requirements, using magnetic field interaction instead. The reed switch is hermetically sealed, solving the sealing property issue while maintaining structural simplicity.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the float and the switch mechanism. The magnet in the float generates a magnetic field that actuates the reed switch in the guide rod without physical contact, thereby eliminating sealing problems associated with mechanical connections while preserving the simple structure.
2Device complexity
If mechanical switches are used in float switches, then the structure can be simple, but the service life is short
Solution Approach 1:
The patent replaces the mechanical switch with a magnetic detection system consisting of a magnet in the float and a reed switch in the guide rod. This substitution eliminates direct mechanical contact and sealing requirements, using magnetic field interaction instead. The reed switch is hermetically sealed, solving the sealing property issue while maintaining structural simplicity.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the float and the switch mechanism. The magnet in the float generates a magnetic field that actuates the reed switch in the guide rod without physical contact, thereby eliminating sealing problems associated with mechanical connections while preserving the simple structure.
3Reliability
If complex mechanical structures are used, then the sealing can be improved, but the reliability is not ideal
Solution Approach 1:
The patent replaces the mechanical switch with a magnetic detection system consisting of a magnet in the float and a reed switch in the guide rod. This substitution eliminates direct mechanical contact and sealing requirements, using magnetic field interaction instead. The reed switch is hermetically sealed, solving the sealing property issue while maintaining structural simplicity.
4Ease of manufacture
If mechanical switches with poor sealing are used, then the production is complex, but the waterproof performance is poor
Solution Approach 1:
The patent replaces the mechanical switch with a magnetic detection system consisting of a magnet in the float and a reed switch in the guide rod. This substitution eliminates direct mechanical contact and sealing requirements, using magnetic field interaction instead. The reed switch is hermetically sealed, solving the sealing property issue while maintaining structural simplicity.
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 provides a float switch with a long service life, high reliability, improved waterproof performance, reduced production complexity and costs, and lower defective rates, while effectively controlling the motor based on water level changes.
Implementation Method 1
The dry reed pipe detection device comprises a high-level dry reed pipe, a low-level dry reed pipe and a magnet. The magnet is arranged in the float.
Implementation Method 2
The low-level dry reed pipe is switched on due to attraction of the magnet
Data Source
AI summary
A float switch includes a floater (106), a float leader (105), a reed pipe detection device and a relay (101). The floater (106) is sleeved on the float leader (105), and can slide freely. The reed pipe detection device comprises a high-level reed pipe (108), a low-level reed pipe (109) and a magnet (107). The float leader (105) is hollow. The high-level reed pipe (108) and the low-level reed pipe (109) are located in a high level and a low level inside the float leader (105) respectively. The magnet (107) is provided inside the floater (106). A motor is controlled by the relay (101) in the float switch. The motor begins to work when the relay (101) is switched on, and the motor stops working when the relay (101) is switched off. The switch has a long service life, high reliability and an excellent waterproof property. The float switch has a simple manufacture and installation process, less fraction defective and condemnation factor, thus further reduces the cost.