The reed switch has its own patent number. “2264746” represents the uniqueness of the reed switch. It has a very special nickname, called reed switch. When you hear the name, you feel that it is very grand. It is not a name that can be obtained by ordinary switches. We often see reed switches used in home appliances, of course, in the automotive industry, communication areas, chemical industry facilities and equipment, and medical equipment in sacred hospitals. Thinking about it, I think this little guy called the reed switch is super powerful.
A reed switch (Reed? Switch), also called a reed switch, is an electrical switch that is operated by an applied magnetic field. In 1936, Walter B. Ellwood of Bell Telephone Laboratories invented the reed switch and applied for a patent in the United States on June 27, 1940. The patent number is reed switch 2264746.
The basic type is to seal two magnetic reeds in a glass tube. Although the two pieces overlap, there is a small gap in the middle. When an external magnetic field is applied, the two magnetic reeds will come into contact and become conductive. ?Once the magnet is pulled away from the switch, the reed switch will return to its original position.
Reed switch symbol:
The old standard (GB/T5094-1985) is S or SQ, the new standard (GB/T5094.2-2003) is B or (GB/ T20939-2007)BG.
The working principle of the reed switch is very simple. Two magnetizable reeds (usually composed of iron and nickel) that overlap at the end points are sealed in a glass tube. The reeds are overlapping and separated by a small gap (only about a few microns). The contacts on the two reeds are plated with a layer of very hard metal, usually rhodium and ruthenium. This layer of hard metal greatly improves the switching frequency and product life. The glass tube is filled with high-purity inert gas (such as nitrogen). In order to improve its high-voltage performance, some reed switches will make the inside a vacuum state.
The reed acts like a flux conductor. When not in operation, the two reeds are not in contact; when the magnetic field generated by a permanent magnet or an electromagnetic coil is used, the external magnetic field causes different polarities near the end points of the two reeds. When the magnetic force exceeds the reed itself When there is elastic force, the two reeds will attract and conduct the circuit; when the magnetic field weakens or disappears, the dry reeds will be released due to their own elasticity, and the contact surfaces will separate to open the circuit.
The basic fully sealed form?Form?A?(?Normally open?)?The basic structure and components of the reed switch.
The above picture depicts Form A (normally open (N.O.) or single pole single throw (SPST) reed switch. Form B represents a normally closed switch, Form? C? (Single Pole Double Throw (SPDT)) represents a switch with a single reed, a normally open piece and a normally closed piece.
Form? C? (Single Pole Double Throw). ?) Three-reed reed switch structure Form? C? (Single Pole Double Throw? (SPDT)? The basic structure of a three-reed reed switch.
The reed switch can make the reed switch Well, this is a permanent magnet, and with the addition of an external coil, it can be sucked together in an instant. It is incredible when you think about it. It has very few shortcomings, but the advantages of the reed switch are countless. Qing, for example, it is extremely small, its body is very light, and its movement speed is also very fast. It is very suitable for high-frequency transmission applications! From this point of view, the reed switch is simply a unique product. It can be described as perfect. .
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