The advantages of new vacuum dryer

This invention having the foregoing operation has following advantages over conventional dryers

. First, the vacuum dryer of this invention has a simple construction. The cost of operation is low since it has a faster drying speed because an electric heater and a high frequency oscillator are used for heating the inside of the combined chambers. Second, the vacuum dryer of this invention can reduce the cost of transporting the dried objects, because the dryer decreases the volume of the objects significantly by removing the moisture from the objects and by reducing the occupied space by using the compression mechanism.

FIG. 2 illustrates a vacuum dryer in accordance with a first embodiment of the invention. The vacuum dryer includes an upper chamber 1 and a lower chamber 11. The lower chamber 11 is detachably mounted to the upper chamber 5 for forming a single chamber to accommodate objects to be dried. Both the upper and lower chambers, 1 and 11, are heat insulated. A vacuum pump 4 is connected to the upper chamber 1 for drawing in air from the connected chambers 1 and 11. A direct heating means 33 is provided at one side of the chambers 1 and 11 for heating objects to be dried. A moisture removing means 2 is provided between the upper chamber 1 and the vacuum pump 4 for preventing the vacuum pump 4 from drawing in moisture from the drying objects once evaporated by the direct heating means 33.

This invention relates to a vacuum dryer, more particularly to a vacuum dryer which is made compact and can quickly dry objects, such as grain, industrial raw materials and thrash.

FIG. 1 is a schematic drawing of one example of a conventional vacuum dryer including an upper chamber 21 and a lower chamber 31 made to communicate with each other. A thermal cycle is formed through the upper chamber 21 and lower chamber 31 using a compressor 24, a condenser 25, an expansion valve 26 and an evaporator 27. A vacuum pump 22 is connected to one side of the upper chamber 21 through a discharge pipe 23.

The advantages of new vacuum dryer

By: eric

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