Efficient heat exchange structure of compressed air refrigeration dryer

Abstract

The invention provides an efficient heat exchange structure of a compressed air refrigeration dryer. The problems that according to existing equipment, ice blockage is prone to occurring, the structure is incompact, and the drying effect is poor can be solved. The efficient heat exchange structure comprises a vertically-arranged first pipe and further comprises a second pipe arranged in an inner cavity of the first pipe; a first cavity is formed between the inner wall of the first pipe and the outer wall of the second pipe; an inner cavity of the second pipe forms a second cavity, and the upper portion of the second pipe is provided with an air inlet and communicates with the second cavity; the second pipe is provided with a plurality of first heat exchange pipes in a vertical penetratingmode, and bottom ends of the first heat exchange pipes communicate with the first cavity; a connection pipe is arranged in the second pipe, the top end of the connection pipe communicates with the upper portion of the first cavity, and the bottom end of the connection pipe communicates with the lower portion of the second cavity; and the bottom of the first pipe is provided with a water collectingtank and a drain pipe. The efficient heat exchange structure is compact in structure, resistant to corrosion, free of secondary pollution, small in pressure loss, capable of reducing ice blockage andleakage phenomena, simple in technology, low in cost and good in water-air separation effect.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a high-efficiency heat exchange structure of a compressed air refrigeration dryer. Background technique [0002] The existing heat exchange structures of compressed air dryers mainly fall into the following categories: the first category is the heat exchange structure of refrigerated dryers, such as image 3 As shown, 1a-cooling and heat exchanger, 2a-evaporator, 3a-gas-liquid separator are made of separate barrels, the structure is complicated, the production is complicated, and the volume is huge. The evaporator adopts copper-aluminum fin type or stainless steel fin type. Heater, the gap between the fins is small, the condensed water is easy to freeze in the evaporator, resulting in ice blockage. The second type, plate or plate-fin type cold dryer heat exchanger, such as Figure 4 As shown, this heat exchange structure has the following problems: 1. Aluminum plate-fin ...

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Problems solved by technology

[0002] The existing heat exchange structures of compressed air dryers mainly fall into the following categories: the first category is the heat exchange structure of refrigerated dryers, such as image 3 As shown, 1a-cooling and heat exchanger, 2a-evaporator, 3a-gas-liquid separator are made of separate barrels, the structure is complicated, the production is complicated, and the volume is huge. The evaporator adopts copper-aluminum fin type or stainless steel fin type. Heater, the gap between the fins is small, the condensed water is easy to freeze in the evaporator, resulting in ice blockage

The second type, plate or plate-fin type cold dryer heat exchanger, such as Figure 4 As shown, this heat exchange structure has the following problems: 1. Aluminum plate-fin heat exchangers or stainless steel plate heat exchangers are used for cold and heat exchange and evaporators, and the welding joints are easy to leak and cannot be repaired; 2. The plates are thin , is also easy to corrode and perforate and cannot be repaired; 3. Due to the small size, the steam-water separation effect is not good; if an external steam-water separator is installed, the compact structure cannot be achieved; 4. The gap between the plates is small, and it is easy to be blocked by dirt. The accumulation of more dirt will affect the heat exchange effect, and the resistance will increase, which will cause an increasing pressure difference between the inlet and outlet of the compressed air, and the condensed water will easily freeze in the evaporator to block the compressed air channel, resulting in ice blockage; 5. The production is complicated, only professional plate or plate-fin heat exchanger manufacturers can make it, and the cost is high

The third category is a cold dryer with a cold heat exchanger and an evaporator built in a bucket, such as Figure 5 As shown in the figure: a-refrigerant inlet, b-refrigerant outlet, h-air inlet, i-air outlet, g-spiral tube, e-filter net, f-evaporator, the evaporator uses copper and aluminum fins Type or stainless steel fin heat exchanger, this structure has the following problems: 1) the fin gap is small, the condensed water is easy to freeze in the evaporator, resulting in ice blockage; 2) there is no special gas-liquid separation device, and It relies on natural gravity for water analysis, and the water is easily taken away by the air flow, and the gas-water separation effect is not good; 3) The production precision is high, the production process is complicated, and the cost is high

[0003] To sum up, the heat exchange structure of existing compressed air dryers is not ideal

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