Explosion-proof air conditioning capacity adjustment explosion-proof electrical common sense

There are generally two methods for capacity adjustment: One method is to achieve a change in the cooling capacity of the explosion-proof air conditioner over a period of time by changing the operating time of the compressor, that is, so-called on/off adjustment. This method is the simplest, most cost-effective method and the least efficient method of adjustment. It is not actually a variable capacity adjustment. There is no room for change in the displacement of the compressor using this method of adjustment. We usually call such an air conditioner a constant speed explosion-proof air conditioner. Another method is to change the displacement of the compressor so that the cooling capacity of the air conditioner can be adapted to the user's thermal load at any time to achieve energy saving and comfort.

There are various methods to change the displacement of the compressor. The most direct method is to change the speed of the compressor and change the cooling capacity of the air conditioner by changing the speed of the compressor. Usually there are two types of AC frequency conversion and DC speed control. Ways. These two methods are widely used in explosion-proof air conditioners, commonly known as "AC frequency conversion" and "DC frequency conversion" explosion-proof air conditioners. Another typical method to change the displacement of the compressor is to change the suction volume of the compressor and change the amount of gas sucking the compressor to achieve the purpose of adjusting the cooling capacity. This method is a purely mechanical method, which can avoid various problems such as electromagnetic interference and electromagnetic compatibility caused by frequency conversion, but makes the mechanical structure of the compressor complicated. Generally used for large-size refrigeration products such as explosion-proof central air conditioning.

In recent years, Copeland's domestic digital scroll compressor has become another typical technical route for variable capacity. It neither changes the compressor speed nor changes the suction volume of the compressor, but changes the compressor in a period of time. The proportion of full-load and no-load running time within the time to achieve the change in compressor cooling capacity. It is actually a start-stop adjustment, but this is done by putting it on the inside of the compressor. The compressor does not shut down during the adjustment process. The air conditioner using this compressor can also realize the coordination and matching of the cooling capacity and the user load, and has similar energy-saving effects as the frequency conversion, and the technical route is relatively simple, and there is no electromagnetic compatibility or electromagnetic interference caused by the frequency conversion. This product is currently in use in our company's explosion-proof air conditioners. However, the current applications are concentrated in multi-line or small home central air conditioning, which is beyond the scope of explosion-proof air conditioners.

Therefore, for variable capacity explosion-proof air conditioner AC frequency conversion and DC speed regulation in two forms. And because these two forms are to change the speed of the compressor, they will be collectively referred to as explosion-proof inverter air conditioners.

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