Progressive defects occur over a longer period of time, and vary in degree from light to heavy, and from weak to strong. They are mainly caused by friction and wear during operation of parts, such as wear of the ignition breaker. cam. A certain cylinder is misfiring, the starter is slipping, etc. Sudden breakdowns are mainly caused by short circuits or open circuits in the circuit, such as headlights no longer turning on or the engine suddenly stalling.
Automotive circuit faults can be divided into destructive faults and functional faults based on the degree of their impact on machine functions.
A destructive failure is an electrical assembly or component that completely loses its ability to operate due to a breakdown and cannot continue to operate without replacement or overhaul, such as a burnt out filament in a light bulb, a breakdown in a circuitintegrated. regulator, or a burned generator stator coil Jiao et al. Functional failure means that the function of the electrical assembly is reduced but the working capacity is not completely lost. This is a non-destructive failure. Its function can be restored after adjustment or partial maintenance, such as excessive ignition circuit breaker contact removal. gap or gap too small, etc.
Friction, wear or fatigue of machines during normal operation.
If the starter rotor shaft and bushing are lubricated with grease, the drive pinion and flywheel ring gear often cannot mesh properly due to wear , which causes the upper teeth to grind, resulting in a short circuit or open circuit. , poor contact or circuit failure. For example, overloading the generator causes the rectifier diode to short; aovervoltage causes the switching tube of the voltage regulator to break and open the circuit, the contacts are ablated and become non-conductive, the capacitor fails and cannot store charge; etc.
The electrical components of the circuit are based on the mechanical structure. Due to mechanical wear, play or insufficient elasticity of the spring, poor circuit contact may occur.
When cars are used in different regions, climates and terrain conditions, various malfunctions often occur. For example: increasing lubricating oil viscosity and low temperature starting resistance will cause early damage to the battery; automobile electrical appliances will cause plastic parts and insulating materials to age due to high temperatures and corrode automobile parts; Illegal driving operations without eNecessary maintenance, cleaning and adjustment will result in wear of mechanical parts; Unreasonable design of mechanical parts, poor manufacturing and poor assembly will all lead to the failure of circuit components. Although the types and phenomena of line faults are diverse, their essence can be divided into mechanical faults, electrical faults and comprehensive electromechanical faults.
These three types of failures are different and related to each other, and cannot be considered in isolation.
For example, bearing wear causes the generator and starter to scavenge; the switch cannot be positioned and the spring fails, causing poor contact; the shaft is bent, causing excessive runout, etc. If a mechanical fault persists for a period of time, it will cause electrical faults. For example, sweeping causes the motor armature coil to short circuit, the gapcontact is too large and the primary ignition circuit cannot be connected, etc. .
Electrical faults are mainly caused by short circuit, open circuit, poor contact or leakage on the circuit.
For example, the generator overload causes the rectifier diode to short circuit, the overvoltage causes the final switch tube of the voltage regulator to break and the circuit to open, the contacts are ablated and no longer drive. electricity, the capacitor breaks down and cannot store charge, and the inductor coil rotates Occasionally short circuit between layers or grounding with the machine body, high voltage insulation The components fail and leak, the battery poles are loose or corroded and become non-conductive, the supply voltage is too high or too low, the magnetic flux of the magnetic components is weakened or enhanced and theCircuit parameters such as frequency and phase vary.
The fundamental way to solve the problem of poor circuit contact caused by mechanical reasons is to restore the integrity of the mechanical structure.
When evaluating faults in a circuit, sometimes it is not enough for people to focus on the circuit or circuit diagram. Simply focusing on the circuit and ignoring the mechanical structure will result in mishandling, which will lead to recurrence. complete mechanical and electrical breakdowns.
Water spray is a type of wet dust removal system;
Working principle
Water spray purifier is a combination of smoke "mechanical + wet" fire (dust) purification equipment, the main structure of the whole equipment is made of corrosion-resistant stainless steel. This product uses original advanced technology and usese a corrugated inclined plate filling. The fan and purifier are connected as one. Through aerodynamics, in the precisely designed integrated structure, due to the force of the fan, the purifier will produce stirring and boiling layers. water and several films of water. Full use of water vapor reverse impact, washing, water film filtration, foam absorption, enrichment, multiple mechanical collisions, interception, cooling , condensation, effective adsorption and other principles to achieve three water purification treatments and three mechanical processes for black smoke (dust) After purification treatment, it is fully purified.
Places producing black smoke and dust, such as cooking smoke, generators, boilers, and spray paints using diesel as fuel