| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger capable of suppressing pressure deformation with a simple configuration.SOLUTION: A heat exchanger comprises a communication flow passage 31 which communicates a first lower tank provided at a plurality of flat tubes which are laminated and a second lower tank provided adjacent to the first lower tank. The communication flow passage 31 has a throttle part 34 formed at the center in a width direction. The throttle part 34 is a curved surface formed by a predetermined radius of curvature R which becomes a protrusion at an inner side of the communication flow passage 31. When a length where an outer dimension becomes maximum in a height direction of the communication flow passage 31 is defined as H, and a length where the outer dimension becomes maximum in a width direction of the communication flow passage 31 is defined as W, the radius of curvature R of the throttle part 34 is R≥0.2H, and a length L where the outer dimension becomes minimum in the height direction of the throttle part 34 of the communication flow passage 31 is L≤0.9H, and a portion of the length H where the outer dimension becomes maximum in the height direction is provided at a position which is outer from the portion which becomes the length L of the communication flow passage 31 by equal to or more than 1/4 W in the width direction. |
