The constant temperature and humidity test chamber compressors are stuck with such failures, accounting for about 20% of all faults. In most cases, single-phase compressors have such failures, accounting for approximately 40% of similar failures. For large-volume compressors, such failures mean damage and wear due to motor power. The main reasons for the compressors of constant temperature and humidity test chambers are as follows: 1. The liquid refrigerant is transferred to the compressor casing; Lack of oil in special operation; 3, foaming; 4, liquid return; 5, suspected system cleanliness.
(1) Liquid refrigerant transfer: This is the most common cause of jamming or mechanical wear. This transfer always occurs during compressor shutdown because the compressor is the coldest place in the system. The refrigerating oil and more or less refrigerant are mixed with each other according to the relationship between pressure and temperature and the properties of the refrigerant and the refrigerating oil. In this way, the oil level will rise. When the refrigerant in the oil is more saturated, the liquid refrigerant sinks to the lowermost part of the casing, because the refrigerant is denser than the oil and refrigerant mixture. When the compressor is started, the oil pump not only draws oil, but also draws out liquid refrigerant or oil/refrigerant mixture. The latter two are not a good lubricant, thus forming a stuck or worn mechanical part. When such a fault occurs, a liquid refrigerant boundary line can be found. When the compressor is stuck, the motor windings are immersed in the liquid, so the overload protector does not trip. As a result, the oil is charred on the surface and is expressed on the surface of the casing or on the surface of the mechanical parts. In order to avoid such problems, the following are recommended: 1. Ensure the return air superheat, so that it is impossible to form abnormal cooling or install a suction pipe accumulator under any operating conditions. 2. Use a crankcase heater to ensure that the compressor is hotter than the other components in the system.
(2) Lack of oil: The compressor is left with 50% of the original fuel quantity, which is considered to be a lack of oil. According to the decomposition of many compressors, it is found that oil may be sucked out of the compressor (especially a short piping system) due to short-time foaming. It takes a long time for these oils to return to the compressor, causing compressor wear. This phenomenon can also explain that some decomposition compressors have an oil level of more than 50%, but they have fewer problems than the original oil.
(3) Foaming: It means that the oil that lubricates the compressor is not enough. In addition, the oil/refrigerant mixture is not a good lubricant. Therefore mechanical wear, sometimes piston/crankshaft wear is found when the compressor is disassembled. (Note: Foaming generally occurs with very low noise in the compressor. Because the foam acts as a sound barrier inside and around the compressor.)
(4) Liquid back: At first, it is difficult to establish the relationship between compressor jamming and liquid return. The liquid refrigerant is in the front position in the cylinder. Liquid hammer is the result of trying to pressurize the liquid. When the piston is at the end of the compression cycle: there is an excess of oil (foam state) or excess liquid refrigerant (rarely possible). The consequences are as follows: - damage to the suction valve; - damage to the gasket; - poor lubrication caused by jam; - a combination of multiple damage.
(5) Cleanliness: If tiny particles or viscous particles are attached to moving parts, the compressor may become stuck or significant wear of the parts. Therefore, it is recommended to ensure the cleanliness of any assembly parts and piping preparations in the system. In particular, the grinding of the parts (pipes, evaporators) and cleaning are very clean.
High quality products with colorful effect, can be customized by customer with low MOQ; Safety transporation with Eco-Friendly,Stocked,Durable feature supports wonderful experience;
Baking Set,Baking Pans,Ceramic Baking Dish,Aluminum Baking Pans
Guangdong Qunfa Ceramics Co., Ltd , https://www.qunfaceramics.com