What is a refrigerator evaporator?
The evaporator is one of the key components in refrigeration systems such as refrigerators and freezers. Traditional evaporator pipelines are made of all-copper tubes, which have low leakage rates but high production costs. In recent years, in order to reduce production costs, many refrigeration companies have gradually changed traditional all-copper tubes to copper-aluminum tubes or all-aluminum tubes. However, due to the relatively active nature of aluminum, the corrosion-resistant oxide film on the surface is very thin, and the influence of other factors such as the use environment, such products are prone to copper and aluminum tube leakage and aluminum tube corrosion during use, which in turn leads to evaporator Internal leakage can cause the entire refrigerator or freezer to malfunction or even be scrapped, causing serious losses to manufacturers and consumers. In the early days of the promotion of aluminum-substituted copper technology, there were many leakage failures at copper-aluminum joints. After the introduction of patented casing extrusion resistance welding technology, leakage failures at copper-aluminum joints gradually decreased. However, the problem of aluminum tube corrosion has not been effectively solved and has increased. trend. Judging from the information currently available, a small amount of literature only provides a preliminary analysis of the reasons for internal leakage of the aluminum tube of the evaporator. There is no in-depth exploration of the serious impact of the corrosive environmental medium on the corrosion mechanism of the aluminum tube, and few targeted suggestions are made. practical and effective solutions. Therefore, analyzing the corrosion mechanism of the evaporator aluminum tube is of great significance for fundamentally solving the problem of internal leakage of the evaporator.
The function and structure of the refrigerator evaporator
The refrigerator evaporator is an important heat exchange component of the refrigerator refrigeration system. It is a device that outputs cold energy in the refrigeration device. It is mainly used for " endothermic”. Evaporators are generally divided into refrigeration and freezing evaporators. Refrigeration evaporators are mostly made of copper and aluminum. Refrigeration evaporators are available in plate and tube type (made of aluminum) and wire tube type (platinum-nickel steel alloy).
The refrigeration system of the refrigerator is composed of a compressor, evaporator, refrigerator, capillary tube, etc. In the refrigeration system, the area size and distribution of the evaporator directly affect the cooling capacity and cooling speed of the refrigerator system. Nowadays, the freezer compartment of the above-mentioned refrigerators mostly uses a multi-heat exchange layer evaporator for cooling. The drawer of the freezer compartment is located between the layers of the heat exchange layer of the evaporator. The structure of the evaporator is divided into steel wire coils. There are two structures: tubular type and aluminum plate coil type.
Which type of refrigerator evaporator is better
Common evaporators in refrigerators include fin coil type, aluminum plate blow-up type, steel wire coil type, and single-ridge fin tube type Five types.
1. Fin coil evaporator.
The finned coil evaporator is an intercooled evaporator. It is only suitable for intercooling refrigerators. The device mostly uses aluminum tubes or copper tubes with a diameter of 8-12mm as the tubular part, and aluminum sheets (or copper sheets) with a thickness of 0.15-3nun as the fin parts. The distance between the fins is 8-12mm. The tubular part of this type of evaporator is used for the circulation of refrigerant, and the fin part is used to absorb heat from the refrigerator and freezer compartments. Fin coil evaporators are often chosen because of their high heat transfer coefficient, small space requirements, solidity, reliability, and long life.
2. Aluminum plate inflated evaporator.
It uses a printed pipe between two aluminum plates. After calendering, the non-printed parts are hot-pressed together, and then blown into a bamboo path by high pressure. This kind of evaporator is used in the cold storage compartment of flash-cut single-door refrigerators, double-door refrigerators, and the cold storage compartment and freezer compartment of small-capacity double-door refrigerators. It is installed in the upper part of the rear wall of the refrigerator in the form of a flat plate.
3. Tube plate evaporator.
It is made by bending a copper pipe or aluminum pipe (generally 8mm in diameter) into a certain shape and then bonding (or brazing) it with the composite aluminum plate. Among them, copper tubes are used for the circulation of refrigerant; aluminum plates are used to increase the conduction area. This type of evaporator is often used as a freezer evaporator and direct cooling in direct-cooling refrigeration-freezers.
Refrigerator evaporator price
At present, there are relatively few refrigerator evaporators on the market, because the refrigerator evaporator is after all a part of the refrigerator. If the refrigerator evaporator fails and other problems , after-sales maintenance personnel will help you replace it, and of course they will charge a fee. It is understood that the price of finned coil evaporator is around 430 yuan.
The above is the relevant introduction about which type of refrigerator evaporator is better and the price. I believe everyone has an understanding of this, and I hope it will be helpful to everyone.