The cause of compressor stuck in the constant temperature and humidity test chamber

The cause of compressor stuck in the constant temperature and humidity test chamber

The constant temperature and humidity test chamber compressor stuck in this type of failure accounted for about 20% of all failures. In most cases, single-phase compressors have such failures, accounting for about 40% of the same type of failure. In the case of large capacity compressors, such failures mean damage and wear due to motor power. The main reasons for the seizure of compressors in the constant temperature and humidity test chambers are as follows: 1. Liquid refrigerant is transferred to the compressor housing; 2. Under special operating conditions, lack of oil; 3, blistering; 4, back to liquid; 5, doubt the system cleanliness.

(1) Liquid refrigerant transfer: This is the most common cause of stuck or mechanical wear. During compressor shutdown, this transfer will always occur because the compressor is the coldest place in the system. The refrigeration oil and more or less refrigerant are mixed with each other according to the pressure-temperature relationship and the properties of the refrigerant and the refrigeration oil. In this way, the oil level rises. When the refrigerant in the oil is saturated, the liquid refrigerant sinks to the lower part of the housing because the density of the refrigerant is greater than that of the mixture of the oil and the refrigerant. When the compressor is started, the oil pump not only pumps the oil, but also extracts the liquid refrigerant, or the oil/coolant mixture. The latter two are not a good lubricant and thus form a stuck or worn mechanical part. When this failure occurs, the liquid refrigerant boundary line can be found. When the compressor is stuck, the motor winding is immersed in the liquid, so the overload protector does not trip. As a result, the oil is charred on the surface and appears on the surface of the shell or the surface of the mechanical part. In order to avoid such problems, the following recommendations are recommended: 1. To ensure that the return air superheat, so that it is impossible to form abnormal cooling or install an aspiration pipe accumulator under any operating conditions. 2. Use a crankcase heater to ensure that the compressor is at a higher temperature than other components in the system.

(2) Lack of oil: The compressor is left with 50% of the original fuel, ie, it is considered to be oil-deficient. According to the decomposition of many compressors, it was found that the oil may be sucked out of the compressor (especially the short piping system) due to bubbling in a short time. It takes a long time for these oils to return to the compressor, causing the compressor to wear. This phenomenon can also explain that some decomposition compressors have an oil level of more than 50%, but less than the original oil. It also causes problems.

(3) Foaming: It means that the oil for lubricating the compressor is not enough. In addition, the oil/coolant mixture is not a good lubricant. As a result, mechanical wear, sometimes piston/crankshaft wear, is found during the decompression of the compressor. (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 return: At first, it was difficult to establish the relationship between the stuck and returned liquid in the compressor. The liquid refrigerant is in the front position in the cylinder. Liquid blow is the result of trying to pressurize the liquid. When the piston is at the end of the compression cycle: there is either an excess of oil (foamy state) or an excess of liquid refrigerant (rarely possible). The consequences are as follows: - Damage to the suction valve; - Damage to the gasket; - Blockage due to poor lubrication; - Combination of various damages.

(5) Cleanliness: If tiny particles or sticky particles are attached to the moving parts, it will cause the compressor to become stuck or cause significant wear of the parts. Therefore, it is advisable to ensure the cleanliness of any assembly components and pipeline preparations in the system. In particular, the polishing of the parts (pipes, evaporators) and cleaning brushes are very clean.

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