Daily inspection should pay attention to check the tension of the compressor belt. The tension of the belt of the automobile compressor is 376N±50N (about 38kg±5kg). If the belt tension is too large, it will cause the compressor pulley bearing to fail early, which means the compressor is noisy. Prompt repair can cause damage to the clutch. If the belt tension is too small, the belt will slip, causing the compressor speed to drop and the cooling effect to be poor. During normal use, the driver can flip the belt by hand. If the belt can be turned 90 degrees, the tension is basically normal. Check the compressor to check the shaft seal and the connection between the compressor and the inlet pipe for leaks. If there is insufficient belt tension or leakage, it should be replaced and repaired in time.
2 condenser function: the condenser is a high-pressure, high-temperature refrigerant from the compressor, cooled into a high-pressure, low-temperature liquid, and then vaporized by a capillary, and then evaporated to the evaporator. Precautions for use and maintenance: Keeping the surface of the condenser clean is essential to ensure proper operation of the entire air conditioning system. Therefore, in order to prevent oil stains, dust or other debris attached to the condenser, the condenser should be cleaned frequently.
Pay attention when cleaning: Do not use high-pressure water gun, high-pressure water gun is easy to damage the heat-dissipating fins, damage the tube, thus reducing the heat dissipation effect; in addition, the gap between the condenser and the radiator should be cleaned, if it is blocked by debris In severe cases, the engine water temperature will be too high, which will reduce the cooling effect.
3 Evaporator function: the refrigerant that has reduced the pressure through the throttling device, the heat in the evaporator is absorbed into the refrigerant gas in the evaporator, and then enters the compressor to circulate, so that the air in the cabin releases heat and cools down. Precautions for use and maintenance: The air filter at the air inlet of the evaporator should be cleaned regularly to prevent dust inside the car. The debris is adsorbed on the air filter screen and hinders air circulation, resulting in insufficient air-conditioning and affecting the cooling effect. In addition, it is also important to ensure that the drain is unblocked, otherwise the drain will be frozen and the evaporator will be damaged in severe cases.
4 liquid storage dryer function: a device for storing refrigerant and absorbing moisture and impurities of refrigerant. On the one hand, it is equivalent to the fuel tank of a car, supplementing the refrigerant for the space where the refrigerant leaks. On the other hand, it filters out impurities doped in the refrigerant like an air cleaner. The liquid storage dryer is also equipped with a certain amount of silica gel material to absorb water.
Precautions for use and maintenance: The service life of the liquid storage dryer is generally two years, because the desiccant in the liquid storage dryer will be invalid after two years of use. If it is not replaced in time, the desiccant absorbs moisture supersaturated and dries. The bag is prone to bursting, and the desiccant powder will block the pipe, causing the air conditioning system to collapse. Therefore, each time you open the pipeline for repair or cleaning, you must replace the new reservoir dryer.
5 air conditioning pipeline, joint function: transport, storage of refrigerant.
Precautions for use and maintenance: In order to facilitate installation, there are many rubber high-pressure hoses in the air-conditioning system. When daily inspection and maintenance of the air-conditioning system, check the hose of the air-conditioning system for wear and aging.
If these hoses are worn and ageing, they must be replaced in time. And remove the obstacles in the worn parts of the hose to prevent wear again. Also check whether the pipe joints are oily. If there is oil indicating that there is a leak in this part, it should be repaired in time. When reinstalling the pipe joints, be sure to use a new special seal and apply a small amount of refrigerating oil to the seal to ensure a smooth installation and improved sealing.
6 expansion valve function: the high-pressure liquid refrigerant from the liquid storage dryer is throttled and decompressed, and the liquid refrigerant amount entering the evaporator is adjusted and controlled to adapt to the change of the refrigeration load, and at the same time, the liquid hammer phenomenon of the compressor can be prevented. (ie, the liquid refrigerant that has not evaporated enters the compressor and is compressed, which easily causes damage to the compressor valve plate) and the evaporator outlet steam is abnormally overheated. Precautions for use and maintenance: In general, when cleaning the air conditioning pipeline, it is best to replace the expansion valve at the same time to prevent the pipeline from being blocked again. In addition, regardless of which expansion valve is used, it is not allowed to adjust the opening of the expansion valve by itself.
7 electrical line function: is the control circuit of the switch air conditioner.
Precautions for use and maintenance: Always check the insulation of the air conditioning control circuit for wear and tear, if any, replace it promptly. If the fuse of the air conditioning system is burnt, do not rush to replace the fuse. Instead, check the fault first, and then replace the fault with the fuse. Do not short-circuit the insurance, otherwise it may burn out the entire line, or it may have adverse effects on other circuits on the car.
8 other notes
a. The car air conditioner must use special refrigerant, special refrigerating machine oil, otherwise, it will not only affect the cooling effect, but also damage the compressor under severe conditions; b. In each maintenance, all the "O" rings of the dismantling pipe are Must be replaced. c. The drain dryer must be replaced after disassembling the pipeline for maintenance.
In short, understand the functions and maintenance of the various components of the automotive air conditioning system, so that the correct use and maintenance, will make our car more comfortable and more economical.
A honing steel, sometimes referred to as sharpening steel, sharpening stick, sharpening rod, butcher's steel, and chef's steel, is a rod of steel, ceramic or diamond-coated steel used to realign blade edges. They are flat, oval, or round in cross-section and up to 1 foot (30 cm) long. The steel and ceramic honing steels may have longitudinal ridges, whereas the diamond-coated steels are smooth but embedded with abrasive diamond particles
Honing steels are used by lightly placing the near edge of the blade against the base of the steel, then sliding the blade away from yourself along the steel while moving it down – the blade moves diagonally, while the steel remains stationary. This should be done with the blade held at an angle to the steel, usually about 20°, and repeating on the opposite side at the same angle. This is repeated five to ten times per side
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