High Definition For TU-1K01 thermal wax actuator for electric switch valve for South Africa Manufacturers
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High Definition For TU-1K01 thermal wax actuator for electric switch valve for South Africa Manufacturers Detail:
1. Operation Principle
The Thermostatic Wax that has been sealed in shell body induces expansion by a given temperature, and inner rubber seal part drives its handspike to move under expansion pressure to realize a transition from thermal energy into mechanical energy. The Thermostatic Wax brings an upward movement to its handspike, and automatic control of various function are realized by use of upward movement of handspike. The return of handspike is accomplished by negative load in a given returned temperature.
2. Characteristic
(1)Small body size, occupied limited space, and its size and structure may be designed in according to the location where needs to work.
(2)Temperature control is reliable and nicety
(3)No shaking and tranquilization in working condition.
(4)The element doesn’t need special maintenance.
(5)Working life is long.
3.Main Technical Parameters
(1)Handspike’s height may be confirmed by drawing and technical parameters
(2)Handspike movement is relatives to the temperature range of the element, and the effective distance range is from 1.5mm to 20 mm.
(3)Temperature control range of thermal wax actuator is between –20 ~ 230℃.
(4)Lag phenomenon is generally 1 ~ 2℃. Friction of each component part and lag of the component part temperature cause a lag phenomenon. Because there is a difference between up and down curve of traveling distance.
(5)Loading force of thermal wax actuator is difference, it depends on its’ shell size.
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Most electric vehicles still adopt the braking system of fuel vehicles and gain additional braking power with EVP or Bosch iBooster. As for these electric vehicles, ESC is still the master controller of braking system. But things have changed. As electric vehicles can, through AC motor, achieve reverse deceleration and recover braking energy, the load of EV braking system reduces considerably. And the new technology drive-by-wire braking system can thus be used.
Drive-by-wire braking system has been extensively used in F1cars, and is replaced when the driving range reaches less than 2,000 km, which causes high costs. Its braking sensitivity is much higher than that of traditional braking systems. Moreover, its flexibility increases dramatically. Hence, the braking system is very practical in the field of ADAS and self-driving. This is why Tesla can achieve intelligentization more easily. Drive-by-wire braking system substitutes ESC system or TCS (traction control system), which allows vehicle manufacturers to get rid of dependence on ESC manufacturers. Tesla Model S, Porsche 918 Spyder, and Audi R8-ETRON adopt this design. There are two systems inside the car: one is traditional front wheel hydraulic brake without EVP, which has the function of ABS; the other is rear-wheel drive-by-wire braking system, which uses electrical signal and motor to control brake calipers.
The disadvantages of drive-by-wire braking system are also evident: first, small braking force due to limited motor power; second, high requirements for heat resistance of brake discs. Porsche 918 Spyder and Audi R8-ETRON adopt ceramic brake discs while Tesla uses high-grade ITT brake discs. Third, due to small volume left for braking motor, only permanent magnet motor can be used. And when you put on brakes, permanent magnet has long been working under the high temperature, thus leading to demagnetization. The reliability of drive-by-wire braking system is yet to be tested. At present, the system, which incurs high costs, can not be used as main braking system but only as auxiliary brake.
In the field of EPS, things get better. China acquired Nexteer, and some enterprises can produce low-end C-EPS. However, the future development of EPS is targeted at R-EPS. There is still an obvious gap between at home and abroad. EPS market is highly concentrated, with the top four manufacturers holding a combined market share of over 75%. The market share of Jtekt exceeded one third. After selling ZF Lenksysteme, ZF still has TRW steering business, reflecting that it has placed emphasis on steering system.
