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  • Fliter drier

Fliter drier

Filter drier in refrigeration system is mainly used to filter 
out impurities and dirt to prevent them from causing damage to  
refrigeration system, or affecting operating efficiency of the 
system. Impurities in refrigeration systems include rust, dust, 
sand, dirt, liquid sludge, and incompletely burned fuel. These 
impurities may cause valves to seize, block internal passages, 
wear system components and affect system performance.
When using filters, regular maintenance and replacement is required.

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Zhejiang Brozer Refrigeration Technology Co., Ltd.
Zhejiang Brozer Refrigeration Technology Co., Ltd.
We are a professional China Fliter drier manufacturer and Fliter drier supplier, Our main products cover all kinds of cold storage, cold storage, fresh-keeping, other cold storage, constant temperature workshops, industrial chillers, various types of non-standard processes refrigeration... and other equipment. We also have a strong R&D team that independently developed box condensing units, open units, water-cooled compression condensing units, air-cooled condensing units, all-in-one and split units, low-temperature screw units, parallel units, industrial chillers, D series Air cooler, series double-sided side outlet air cooler, water flush frost air cooler series, air-cooled condenser series, etc. Products are exported to more than 80 countries and regions around the world.
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How does the filter-dryer effectively remove the tiny oil droplets suspended in the refrigerant and the incompletely burned fuel residue?

Removal mechanism of tiny oil droplets
In the refrigeration system, due to the operation of equipment such as the compressor, some lubricating oil will inevitably mix into the refrigerant to form tiny oil droplets. If these oil droplets exist in the system for a long time, they will not only reduce the refrigeration efficiency, but also may cause corrosion and wear to the system components. The filter-dryer effectively solves this problem through its unique structural design and material selection.

The filter-dryer usually uses multiple layers of filter media inside, including but not limited to polyester fiber, glass fiber, activated carbon, etc. These media have excellent adsorption and filtration properties and can intercept particles of different sizes in grades. For tiny oil droplets, they will first pass through the coarser filter layer to remove large particle impurities, and then enter the finer filter layer. In these fine layers, the oil droplets will be firmly grasped due to the adsorption effect on the surface of the medium, thereby achieving effective removal.

In addition, some high-end filter-driers also use specially designed oil separators or oil recovery devices. These devices utilize the difference in physical properties between oil droplets and refrigerants (such as density, viscosity, etc.), and through specific flow channel design and speed control, the oil droplets gradually gather and separate during the flow process, and then pass through a special recovery path to discharge the system, further improving the removal efficiency of oil droplets.

Removal of incompletely burned fuel residues
In some special applications, such as fuel-driven refrigeration systems or systems with the risk of fuel leakage, incompletely burned fuel residues may become another type of impurity in the refrigerant. These residues usually have a high carbon content and complex chemical composition, and the corrosion and wear effects on system components are more significant.

In response to this problem, the filter dryer also demonstrated its powerful processing capabilities. First, through the layer-by-layer interception and adsorption of multi-layer filter media, most of the incompletely burned fuel residues will be captured and removed during the flow process. In particular, for those residue particles that are small and difficult to be captured by ordinary media, the adsorption materials such as activated carbon inside the filter dryer can use their huge specific surface area and strong adsorption capacity to firmly adsorb these tiny particles on the surface, thereby preventing them from entering the system.

Some filter-driers also use special chemical reaction mechanisms to remove incompletely burned fuel residues. For example, by adding specific catalysts or reactants to the filter medium, the fuel residues undergo chemical reactions when passing through the filter layer and are converted into harmless or easy-to-handle substances, thereby achieving effective removal of the residues.