1, silver contact material: AgCdO produced by atomization process, silver alloy produced by atomization process, silver cadmium metal after melting, silver cadmium alloy water with high pressure water into nanoscale fine silver cadmium alloy particles, and then silver cadmium alloy particles are oxidized into silver cadmium oxide alloy in high temperature and high pressure oxidation furnace, and then silver cadmium oxide alloy powder into silver alloy wire or sheet. The silver cadmium oxide alloy produced by this atomization process has fine grain, uniform distribution, no peroxy zone and cadmium poor zone. This silver alloy material can break 6000A current in the circuit breaker, with good breaking resistance, breaking by cadmium vapor volatilization blow out, blow away the arc, with self-extinguishing arc effect, breaking will not stick together and broken. This silver alloy material also has good electrical conductivity, low contact resistance and stability, the contact itself after the contact is closed the heat is very small, will not be due to excessive resistance heat and soften the patch panel and housing, the performance of AgCdO alloy produced by this atomization process is the domestic ordinary internal oxidation process and beyond;
2, silver contact silver alloy layer thickness:
Life data of three different thicknesses of combined gold and silver contact layers
Ambient temperature 20℃, voltage 220V, load 5KW resistance load, one minute for one on-off cycle;
0.4mm 34600 times
0.5mm 56000 times
0.6mm 86500 times
According to the use frequency of 30 times a day 365 days a year, about 11,000 times a year, it can be estimated that the silver contact with a silver alloy layer thickness of 40 wires (0.4mm) can be used for about 3 years under normal conditions, and the silver contact with a silver alloy layer thickness of 50 wires (0.5mm) can be used for about 5 years under normal conditions. A silver contact with a silver alloy layer thickness of 60 wires (0.6mm) can be used for about 10 years under normal conditions.
3, silver contact shape design:
Moving silver contact and static silver contact all adopt curved working surface, that is, double spherical design, because the contact will not produce arc when the contact is normally closed (unless the virtual connection), the spherical silver contact is closed with point contact, the point contact is only a larger current density, the contact surface of the moving and static contact has liquefied after the contact is energized, there is no effect on the current conduction, nor will it affect the temperature rise. Some mainstream silver contacts in Germany and Italy use bispherical design. Bispherical design of silver contacts in the breaking of the advantages are very obvious: When breaking to block the connection of electric ions, it will produce a highly hot blue arc. When the cadmium vapor can quickly blow the arc along the spherical arc and extinguish it, it will not be blocked. However, if the two silver contacts are both flat or a spherical plane, the arc is not easy to blow away and extinguish, and the silver alloy layer will be burned and destroyed repeatedly. This will accelerate the contact adhesion, commonly known as connected. The temperature of the arc is 8000 ° C, and if it is not blown away as soon as possible, even tungsten steel or gold will be burned and destroyed.
4. Closing position of dynamic and static contact: After standardized design and precision production, the deviation between the actual product size and the design size is within 5 wires (0.05mm). When combined with the patch board, the moving contact and the static contact can ensure that more than 95% of the center position contact is closed (working), and the use effect of silver alloy is maximized. If the dynamic silver contact is not center to center contact or the contact position is large away from the center, even if the thickness of the silver alloy layer is 0.8mm, the service life of 0.5mm of the dynamic silver contact is not necessarily long.
5, the opening distance of dynamic and static silver contacts: reasonable opening distance: the distance between the working face of the dynamic contact and the static contact in the state of power failure, can ensure that the faucet is quickly and forcefully disconnected when the water is cut off, to ensure that there is enough arc extinguishing distance and arc extinguishing space, can quickly extinguish the arc, and will not cause burning damage to the silver contact because the power failure distance is too small. According to the requirements of the new CCC, when the starting water pressure is 0.048-0.05Mpa (0.48-0.5Kg), the distance of the contact surface of the dynamic and static silver contacts is about 1.8mm.
6, the material and hardness of the moving contact plate: stamping aging treatment (quenching); Surface degreasing; Thick silver plating; Riveted into moving contact.
The forming Angle of our moving contact plate is two large bending angles, and the closing Angle is the most reasonable, which can ensure that the center point and the center point are fully contacted when the static and dynamic contact is closed, and the use effect of the silver contact is maximized. After aging treatment, the hardness can reach 380HV, after the test, repeated action 150,000 times, the shrapnel no deformation, no significant loss of elasticity, fully ensure the service life; The surface of the static and static contact plate is plated with a thick layer of pure silver conductive layer, which will not be yellow and discolored, and the contact resistance is low and stable, and will not be obviously heated. After the silver contact plate is installed on the patch board, the free opening distance between the moving silver contact and the static silver contact is about 1.7mm, and the starting water pressure is 0.035-0.04Mpa (0.35-0.40Kg), which can be adjusted slightly to reduce the time for adjusting the water pressure when testing the water.
7, static contact sheet materials and characteristics, there are three kinds of static contact sheet materials:
The first: 0.7mm thick beryllium bronze imported from South Korea. After aging treatment, the hardness of the imported beryllium bronze static contact sheet can reach 400HV, which has the highest hardness and the best elasticity. After testing, we fixed the M4 connection screw end tightly, and used the cylinder with a 30kg force of 2.5mm at the center of the static silver contact to reset. After repeated action of 100,000 times, the working surface of the static contact sheet was only raised by 0.1mm, which is almost negligible. It can be said that there is no deformation after 100,000 times of work, and the change in the size of only one hair will not affect the starting water pressure, which fully ensures the service life, and there will be absolutely no phenomenon of starting water pressure getting larger and larger and eventually no electricity.
The second: Extra hard 1.4mm thick thickened brass, the thickness is 40% thicker than the conventional 1mm thickness on the market, the hardness is 130HV, 50% harder than the 85HV on the market, two reinforcing bars are made on both sides of the M3 adjusting screw hole of the static contact plate, and the bending strength is 30% higher than that without reinforcing bars. The above points fully ensure that the static contact sheet will not be deformed, upwarped and bent during use, and there will be no phenomenon of starting water pressure becoming larger and larger and eventually no electricity;
The third: Extra hard 1.2mm thick and thick brass, the thickness is 20% thicker than the conventional 1mm thickness in the market, and the hardness is 130HV, 50% harder than the 85HV in the market. We have made two reinforcing bars on both sides of the M3 adjusting screw hole of the static contact plate, and the bending strength is 30% higher than that without reinforcing bars. The above points fully ensure that the static contact sheet will not be significantly deformed and warped during use.
8, the size and material of the wiring board (circuit board) : the wiring board (circuit board) is an important part of the electric contact system of the fast electric heating faucet, the strength, temperature resistance, pressure resistance, the installation size is inaccurate, and the silver contact plate is not matched, and the quality of the fast electric heating faucet is also greatly affected.
