JP-2026074449-A - heat exchanger

JP2026074449AJP 2026074449 AJP2026074449 AJP 2026074449AJP-2026074449-A

Abstract

[Problem] To provide a heat exchanger that enables control of the flow of brazing material in the header tank of the heat exchanger and suppresses the occurrence of brazing defects. [Solution] The heat exchanger 1 comprises a header tank 3 having a cylindrical body 30 and a cap 33 that closes the opening at the end of the cylindrical body 30. The cylindrical body 30 is made up of a first member 31 and a second member 32, and includes a single-layer region 301 consisting only of the first member 31 or the second member 32, and a double-layer region 302 formed by stacking the first member 31 and the second member 32. The cap 33 has a bent portion BN at its edge 33T that continuously covers the single-layer region 301 and the double-layer region 302 around the opening, and an inclined surface SL is provided on the outer surface of the cylindrical body 30 near the bent portion BN, inclined in the direction of the bent portion BN. [Selection Diagram] Figure 4

Inventors

下▲崎▼ 愛奈

Assignees

サンデン株式会社

Dates

Publication Date: 20260507
Application Date: 20241021

Claims (4)

A heat exchanger comprising a cylindrical body and a header tank having a cap that closes the opening at the end of the cylindrical body, The cylindrical body is formed by combining a first member and a second member, and includes a single-layer region consisting only of the first member or the second member, and a double-layer region in which the first member and the second member are stacked. The cap has a bent portion at its edge to continuously cover the single-layer region and the double-layer region around the opening. An inclined surface is provided on the outer surface of the cylindrical body near the bend, extending from the center in the longitudinal direction of the cylindrical body toward the bend. A heat exchanger characterized by the following features.
The inclined surface is provided in the single-layer region and is inclined toward the direction of the bend from a position that protrudes outward from the inner surface of the bend beyond the outer surface of the cylindrical body. The heat exchanger according to feature 1.
The inclined surface is part of a protrusion provided on the outer surface of the cylindrical body near the bent portion. The heat exchanger according to feature 1.
The aforementioned inclined surface is the brazing material placement area in the brazing process. The heat exchanger according to feature 1.

Description

This invention relates to a heat exchanger. Conventionally, vehicle air conditioning systems utilizing a heat pump cycle employ multiple heat exchangers in the refrigerant circuit. These multiple heat exchangers include, for example, heat exchangers located within an HVAC (Heating, Ventilating, and Air Conditioning) unit with an airflow passage through which cabin air flows, and heat exchangers located outside the cabin (outdoor heat exchangers). Outdoor heat exchangers, for example, may have multiple parallel tubes and tanks connected to both ends (upper and lower ends), functioning as radiators during cooling and as heat absorbers during heating. The outdoor heat exchanger tank is constructed by, for example, shaping a first tank member and a second tank member, each roughly concave, facing each other so as to close their openings, and joining them by overlapping, for example, a portion of the side surface of the first tank member and a portion of the side surface of the second tank member. The ends of the cylindrical tank are then sealed with caps (see, for example, Patent Document 1). Japanese Patent Publication No. 2024-075919 This is an external perspective view of a heat exchanger according to an embodiment of the present invention.This is a perspective view showing a first example of a header tank according to an embodiment of the present invention.This figure shows a first example of a header tank according to an embodiment of the present invention, and is a cross-sectional view of the end.This figure shows a first example of a header tank according to an embodiment of the present invention, where (A) is an exploded perspective view of the end, (B) is a perspective view of the end, and (C) is an exploded side view of the end.This is a front view of the end portion of a header tank, showing a first example of an embodiment of the present invention.This figure shows a second example of a header tank according to an embodiment of the present invention, where (A) is an exploded perspective view of the end and (B) is an exploded side view of the end.This is a front view of the end portion of a header tank, showing a second example according to an embodiment of the present invention.This is a diagram of a conventional heat exchanger. The embodiments of the present invention will be described below with reference to the accompanying drawings. Figures 1 to 7 are examples of embodiments of the present invention. In the figures, parts denoted by the same reference numerals indicate parts or components with the same function, and redundant explanations in each figure will be omitted as appropriate. <Heat exchanger> Figure 1 is a schematic perspective view showing an example of a heat exchanger 1 according to this embodiment. The heat exchanger 1 comprises a plurality of tubes 2 arranged in parallel and header tanks 3 and 4 connected to both ends of the tubes 2 in the direction of extension. Note that Figure 1 is a schematic diagram, and the header tanks 3 and 4 have the configuration shown in detail in Figures 2 and later. The heat exchanger 1 performs heat exchange between a heat transfer medium flowing through the tubes 2 via the header tanks 3 and 4 and a fluid (for example, air) passing between the plurality of tubes 2. In this embodiment, a heat transfer medium is used as an example in the configuration of the tubes 2, but a refrigerant may also flow through them. In the illustrated example, tube 2 extends in one direction (direction indicated by arrow X (Xa-Xb)) and is a flattened pipe along the direction intersecting its extension (direction indicated by arrow Z (Za-Zb)). Multiple tubes 2 are arranged in parallel at predetermined intervals in the direction intersecting its extension (direction indicated by arrow Y (Ya-Yb)), and the space between the multiple tubes 2 becomes the passage path for the fluid to be heat exchanged. The fluid to be heat exchanged flows in the direction indicated by arrow Z, and heat exchange occurs with the heat transfer medium flowing inside the tubes 2 as it passes between the multiple tubes 2. To improve the heat exchange efficiency, fins (e.g., corrugated fins), which are generally not shown, are provided in the space between the multiple tubes 2. In the following explanation, the direction indicated by the arrow X in Figure 1 is referred to as the tube extension direction, the direction indicated by the arrow Y is referred to as the longitudinal direction of the header tank (or simply the longitudinal direction), and the direction indicated by the arrow Z is referred to as the short direction of the header tank (or simply the short direction). Header tanks 3 and 4 are provided at both ends in the direction of tube extension (X direction). One of the header tanks, 3, is formed by joining a first tank member 31 and a second tank member 32 to create a cylindrical shape. By closing both ends in the longitudinal direction of the header tank (Y direction indicated by the arrow