Dehumidifying unit, layered temperature control dehumidifying element and drying device

Abstract

A dehumidifying unit, a layered temperature control dehumidifying element and a drying device are provided. The dehumidifying element has a plurality of dehumidifying units. The dehumidifying units are made of a direct heating desorption material and used for dehumidifying air by adsorption and capable of being regenerated by desorption. By performing temperature compensation through a preheater and performing a layered temperature control method on the dehumidifying element, the disclosure achieves a uniform temperature control on the air flow passage of the dehumidifying element so as to improve regeneration performance of the dehumidifying element and reduce energy consumption of the drying device.

What is claimed is: 
     
         1 . A layered temperature control dehumidifying element, comprising:
 a plurality of dehumidifying units comprising a direct heating desorption material and used for dehumidifying air by adsorption and capable of being regenerated by desorption, wherein the dehumidifying units are respectively disposed in a plurality of air chambers that are separated from one another by at least a partition board, and through holes are formed between the air chambers to allow air to pass through and flow in parallel passages of the air chambers;   a preheater disposed at an air inlet end of the layered temperature control dehumidifying element to perform preheating and temperature compensation on a first group of the dehumidifying units and thereby keep the first group of the dehumidifying units at a uniform temperature for regeneration;   a plurality of first temperature sensors respectively disposed at central positions of the dehumidifying units to perform temperature monitoring and feedback during regeneration of the dehumidifying units, wherein the first temperature sensors have connectors disposed at one side of the layered temperature control dehumidifying element; and   a second temperature sensor disposed at an outlet port of the preheater to perform temperature monitoring and feedback when the preheater performs heating or temperature compensation.   
     
     
         2 . The element of  claim 1 , further comprising a logic control circuit connected to the preheater, the first temperature sensors and the second temperature sensor to perform a uniform temperature control on the dehumidifying units. 
     
     
         3 . The element of  claim 1 , wherein the direct heating desorption material is fixed to each of the dehumidifying units by a tension-adjustable frame, and the direct heating desorption material is passed through gaps between rib portions of the frame so as to be wound back and forth in a U-shape on the rib portions of the frame. 
     
     
         4 . The element of  claim 1 , further comprising a fixing frame having a side cover board, a bottom board, an air inlet end board, an air outlet end board, an upper cover board and a preheater cover board, the inside of the fixing frame is separated by the partition boards into the air chambers for receiving the dehumidifying units. 
     
     
         5 . The element of  claim 4 , wherein two ends of the direct heating desorption material are conductively connected to conductive plates, respectively, and electrode screw holes are formed in the conductive plates and engaged with electrode screw sets of the upper cover board so as to allow current to flow into the conductive plates for regeneration of the direct heating desorption material. 
     
     
         6 . The element of  claim 4 , wherein the air inlet end board has an air inlet port and the air outlet end board has an air outlet port, and gaskets are disposed around the air inlet port and the air outlet port, respectively. 
     
     
         7 . The element of  claim 6 , wherein the preheater is a positive temperature coefficient (PTC) resistor. 
     
     
         8 . A direct heating desorption type drying device, comprising:
 an air inlet pipeline group;   an air outlet pipeline group positioned over the air inlet pipeline group;   a plurality of direct heating desorption type drying components connected in parallel, wherein, valves of the air inlet pipeline group and the air outlet pipeline group are switched on/off to control air flowing into pressure tanks of the direct heating desorption type drying components, wherein each of the pressure tanks has a plurality of dehumidifying elements and each of the dehumidifying elements has a preheater to perform preheating and temperature compensation on the dehumidifying element, the pressure tank has air inlet and outlet ports connected to the air inlet and outlet pipeline groups, respectively, and the air flowing into the pressure tank is dehumidified by dehumidifying units of the dehumidifying elements of the pressure tank through adsorption or is used to regenerate the dehumidifying units by desorption; and   a heat exchanger in communication with the air inlet pipeline group, the air outlet pipeline group and the valves to condense high-temperature high-humidity air after regeneration of the direct heating desorption type drying components and accelerate cooling of the dehumidifying units.   
     
     
         9 . The device of  claim 8 , wherein the pressure tank further has a base body, an air inlet hopper having an air inlet orifice plate and a diffusion net that allow air to uniformly flow into the dehumidifying elements, and an air outlet hopper having a filtering net and an air outlet orifice plate for filtering out dust and impurity in the air. 
     
     
         10 . The device of  claim 9 , wherein the pressure tank has a connection plate disposed at one side of the base body to facilitate mounting of the dehumidifying elements, and the connection plate further has temperature connector groups connected to temperature sensor groups of the dehumidifying elements in the base body and power connector groups connected to the dehumidifying elements and the preheaters in the base body to supply power to the dehumidifying elements and the preheaters. 
     
     
         11 . The device of  claim 10 , wherein the temperature sensor groups and the preheaters are connected to a logic control circuit to achieve a uniform temperature control on the dehumidifying elements. 
     
     
         12 . The device of  claim 8 , wherein the dehumidifying elements are arranged in an array in the pressure tank. 
     
     
         13 . The device of  claim 8 , wherein the direct heating desorption type drying components change between dehumidifying and regenerating processes by alternately switching on/off two or more valves.