Heat exchanger for heat pump

Abstract

The heat exchanger for heat pump disclosed in the present invention includes collecting pipes set in level direction, flat pipes vertically mounted among the collecting pipes and connected with the collecting pipes, and fins inserted among the collecting pipes in horizontal direction. The fins include multiple cell radiating ribs among the flat pipes. Each cell radiating rib includes several staggered and protruding arched bridge pieces, two guide pieces disposed on two sides of the arched bridge pieces and connected to the ends of the bridge pieces, water preventing wale disposed at the edge of the front end of the guide pieces, and a discharging mechanism disposed in front of the guide pieces for discharging the condensed water or defrosting water downward. The present invention can discharge the condensed water or defrosting water in time, thereby effectively avoid the condensed water or defrosting water blocking wind passage and reduces wind resistance. Because the condensed water or defrosting water is discharged in time, the frost amount is then reduced. Furthermore, the staggered and protruding arched bridge pieces on the surface of cell radiating piece can reduce wind resistance, disturb temperature border layer, reinforce the mixture of air flow and enhance the heat exchanging effect.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a heat exchanger using flat tubes. Background technique [0002] Traditional parallel flow heat exchangers generally adopt a structure in which flat tubes and corrugated fins are stacked. When this type of heat exchanger is used as an air source heat pump condenser, a large amount of defrosting water after heating and defrosting tends to accumulate in the channel formed between the heat sink and the heat sink, and cannot be discharged, which seriously blocks the air flow channel and increases the air flow. At the same time, it is easy to make the frost layer thicker and thicker, and even freeze, which greatly reduces the performance of the heat pump. [0003] The flat tubes of the traditional parallel flow heat exchanger are arranged in the horizontal direction, and when used as an evaporator, there is a common problem of uneven liquid separation. Recently, some improved heat ex...

AI Technical Summary

Problems solved by technology

When this kind of heat exchanger is operated under refrigeration conditions, the condensed water precipitated on the surface of the evaporator will adhere to the surface of the evaporator and accumulate in the channel, which will greatly increase the heat transfer resistance and affect the heat transfer efficiency of the evaporator

At the same time, because the condensed water cannot be discharged in time, it will block the air flow channel, increase the flow resistance of the air, and further affect the heat exchange efficiency of the evaporator. In serious cases, the condensed water may be blown into the room, resulting in the unusable evaporator.

[0004] To sum up, the traditional parallel flow heat exchanger has the same problem when it is used as a condenser and an evaporator: condensed water or defrosted water is easy to adhere to the fins to block the air duct and increase the wind resistance; The outer surface of the tube is attached, and the thermal resistance caused by the attachment on the surface of the tube is greater than the thermal resistance caused by the attachment to the heat sink, so the heat exchange efficiency of the heat exchanger is seriously reduced

[0005] U.S. Patent No. 6,964,296B2 discloses an outdoor heat exchanger for heat pumps, which is dedicated to solving the problem of condensed water removal. The disclosed heat exchanger has a serious problem: due to the strong wind force inside the heat exchanger, condensed water droplets are easy to be directly Blows out of the heat exchanger instead of downwards under the force of gravity

The applicant of this case provided a new type of heat pump heat exchanger that can remove condensed water in China Patent Application No. 200620067330.3, but the technology disclosed in this application is difficult to realize in terms of processing technology

[0006] In addition, while considering the problem of condensed water removal in the above-mentioned prior art, it ignores the specific improvement on the sheet type, so as to further enhance the heat exchange effect and achieve the goal of high efficiency and energy saving.

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