熱交換器、その熱交換器を用いた冷凍サイクル装置、並びに、その冷凍サイクル装置を用いた空気調和機及びヒートポンプ給湯機

Heat exchanger, refrigerating cycle device using the same, air conditioner using the refrigerating cycle device, and heat pump hot water supply machine

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger, capable of securing a sufficient heat transmission area and a ventilation path even when clogging occurs in a beltlike cut and raised piece due to frost under a low-temperature environment.SOLUTION: The heat exchanger includes: a plurality of fins, arrayed parallel to a plate thickness direction; a plurality of heat transmission tubes, penetrating the fins in the plate thickness direction, arrayed at predetermined intervals in a fin longitudinal direction, and having refrigerants flowing therein; and beltlike cut and raised pieces, formed between the plurality of adjacent heat transmission tubes and on the surfaces of the fins. Here, air is blown perpendicularly to the fin longitudinal direction and the plate thickness direction, to execute the heat exchange between the air and refrigerants. The beltlike cut and raised pieces are formed so as to become wider from the upstream side to the downstream side in an air blowing direction, the leeward side ends of the fins with respect to the heat transmission tubes are projected toward the leeward side to form projected parts, and the leeward side ends of the fins with respect to the beltlike cut and raised piece are recessed relatively to the projected parts to form recessed parts.
【課題】低温環境下において着霜により帯状切起片に目詰まりが生じた場合においても、十分な伝熱面積と通風路を確保する熱交換器を提供することを課題とする。 【解決手段】本発明に係る熱交換器は、板厚方向に平行に並べられた複数のフィンと、フィンを板厚方向に貫通し、フィンの長手方向に所定間隔で配列され、内部を冷媒が流動する複数の伝熱管と、隣り合った前記複数の伝熱管の間であって、フィンの表面に形成された帯状切起片と、を備え、フィンの長手方向及び板厚方向に対して垂直方向に空気を送風し、空気を冷媒と熱交換させる熱交換器であって、帯状切起片は送風方向上流側から下流側に向かってその幅が広くなるように形成し、伝熱管に対するフィンの風下側端部を風下側に突出させて凸部を形成し、帯状切起片に対するフィンの風下側端部をこの凸部に対して相対的にへこませて凹部を形成した。 【選択図】 図1

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