Finned tube type heat exchanger

Abstract

The utility model discloses a finned tube type heat exchanger which comprises a copper heat exchange tube and a plurality of fins, the heat exchange tube penetrates through the fins and is bent in a circuitous mode to form a double-row heat exchange loop, the fins are provided with a plurality of heat exchange loops which are evenly distributed in the vertical direction, one end of each heat exchange loop is connected to a liquid collecting tube, and the other end of each heat exchange loop is connected to a heat exchanger. The other ends of all the heat exchange loops are connected to the exhaust vertical pipe, and the two rows of transverse flow channels in the heat exchange loops are staggered in the vertical direction. During refrigeration, refrigerants in each loop enter the outer-row heat exchange coil from the inner-row heat exchange coil, the refrigerants and outdoor air are ventilated and subjected to countercurrent flow heat exchange, the supercooling degree of the refrigerants is improved, and therefore the refrigerating capacity of the air source heat pump unit is improved. When the air source heat pump unit is used for heating, refrigerants in each loop enter the inner-row heat exchange coil from the outer-row heat exchange coil, the refrigerants and outdoor air are ventilated and exchange heat in a downstream mode, the evaporation heat absorption and exchange length of the refrigerants is increased, and therefore the heating capacity of the air source heat pump unit is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a fin-tube heat exchanger. Background Art

[0002] An air source heat pump is an energy-saving device that uses high-level energy to make heat flow from a low-level heat source to a high-level heat source. Its working principle is based on the reverse Carnot cycle principle. The liquid working fluid first absorbs heat from the air in the evaporator and evaporates to form steam (vaporization). The latent heat of vaporization is the recovered heat. It is then compressed into a high-temperature and high-pressure gas by the compressor and condensed into a liquid (liquefaction) in the condenser, transferring the absorbed heat to the water that needs to be heated. The liquid working fluid is expanded by the expansion valve after reducing the pressure, and then returns to the expansion valve, absorbing heat and evaporating to complete a cycle. This cycle repeats itself, and the working fluid flow in the refrigeration process is in the opposite direction.

[0003] Current air source heat pump units use fin-tube heat exchangers to exchange heat with outdoor air. The circuit layout of the fin-tube heat exchanger affects the cooling (heating) effect of the air source heat pump unit. Some circuit layouts are conducive to cooling of the air source heat pump unit, but the heating effect is poor. Some circuit layouts are conducive to heating of the air source heat pump unit, but the cooling effect is poor. An unreasonable circuit layout of the fin-tube heat exchanger will cause an imbalance in cooling and heating of the air source heat pump unit. Utility Model Content

[0004] The purpose of the utility model is to provide a fin-tube heat exchanger to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fin-tube heat exchanger, comprising a copper heat exchange tube and a plurality of fins, wherein the heat exchange tube passes through the fins and bends in a circuitous manner to form a double row of heat exchange circuits, wherein the fins are provided with a plurality of vertically evenly distributed heat exchange circuits, wherein the heat exchange circuit is L-shaped as a whole, wherein one end of all the heat exchange circuits is connected to a liquid collecting pipe, and the other end of all the heat exchange circuits is connected to an exhaust riser, and wherein two rows of horizontal flow channels in the heat exchange circuits are staggered in vertical positions.

[0006] Preferably, the end bends of the heat exchange tubes in the heat exchange circuit are connected by a U-shaped joint, and the bending radius of the U-shaped joint is not less than times its radius.

[0007] Compared with the prior art, the beneficial effects of the utility model are as follows: during cooling, the refrigerant of each heat exchange circuit enters from the inner row of heat exchange coils and exits from the outer row of heat exchange coils, and the refrigerant and the outdoor air are ventilated countercurrently for heat exchange, which increases the refrigerant supercooling, thereby increasing the cooling capacity of the air source heat pump unit. During heating, the refrigerant of each heat exchange circuit enters from the outer row of heat exchange coils and exits from the inner row of heat exchange coils, and the refrigerant and the outdoor air are ventilated concurrently for heat exchange, which increases the refrigerant evaporation heat absorption heat exchange length, thereby increasing the heating capacity of the air source heat pump unit. This heat exchanger, since each heat exchange circuit spans two rows, the layout is reasonable, and the functions of cooling and heating are balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a side view structural schematic diagram of the utility model;

[0009] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0010] Figure 3 It is a schematic diagram of the top structure of the utility model.

[0011] In the figure: 1. heat exchange tube; 2. fin; 3. U-shaped joint; 4. exhaust riser; 5. liquid collecting pipe. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0013] See also Figure 1-3 The utility model provides a technical solution: a fin-tube heat exchanger, comprising a copper heat exchange tube 1 and a plurality of fins 2, wherein the heat exchange tube 1 passes through the fins 2 and bends in a circuitous manner to form a double-row heat exchange circuit, the heat exchange circuit is L-shaped as a whole, and each heat exchange circuit is provided with a plurality of transverse flow channels, and the flow channels are evenly distributed in the front and rear rows. In the figure, (A1, A2); (B1, B2); (C1, C2) ..., respectively represent the two ports of each group of heat exchange circuits.

[0014] The end bends of the heat exchange tubes 1 in the heat exchange circuit are connected by U-shaped joints 3. The bending radius of the U-shaped joints 3 is not less than 3 times its radius. The fins 2 are provided with a number of vertically evenly distributed heat exchange circuits. One end of all heat exchange circuits is connected to the collecting pipe 5, and the other end of all heat exchange circuits is connected to the exhaust riser 4. The collecting pipe 5 and the exhaust riser 4 are both used to connect to the refrigerant circulation system. The two rows of horizontal flow channels in the heat exchange circuit are staggered in the vertical positions. When the refrigerant circulates in the tube, the heat exchange with the airflow is uniform and sufficient. The wind direction of this heat exchanger when in use is as follows: Figure 3As shown, the wind direction and the refrigerant flow direction in the pipeline form a co-current or counter-current.

[0015] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fin-tube heat exchanger, comprising a copper heat exchange tube (1) and a plurality of fins (2), characterized in that: The heat exchange tube (1) passes through the fin (2) and bends in a circuitous manner to form a double row of heat exchange circuits. The fin (2) is provided with a plurality of heat exchange circuits evenly distributed vertically. The heat exchange circuit is L-shaped as a whole. One end of all the heat exchange circuits is connected to a liquid collecting pipe (5), and the other end of all the heat exchange circuits is connected to an exhaust riser (4). The two rows of horizontal flow channels in the heat exchange circuit are staggered in vertical positions.

2. The fin-tube heat exchanger according to claim 1, characterized in that: The end bends of the heat exchange tubes (1) in the heat exchange circuit are connected via a U-shaped joint (3), and the bending radius of the U-shaped joint (3) is not less than 3 times its radius.

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