JPH0311599Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Industrial Application Field This invention relates to a tubular header for a heat exchanger. Prior art and its problems FIG. 4 shows an example of an evaporator for a car cooler. The evaporator includes: an aluminum meandering flat tube 1 having a plurality of refrigerant passages formed therein and having a straight pipe portion 1a; a corrugated fin 2 made of an aluminum brazing sheet interposed between each straight pipe portion 1a; A circular tubular header 3 made of an aluminum brazing sheet connected to both ends of the flat tube 1, an aluminum refrigerant supply pipe 4 connected to one header 3, and an aluminum refrigerant discharge connected to the other header 3. It is equipped with a tube 5.
The connection between each header 3 and the flat tube 1 is as follows:
A hole for connecting a flat tube extending in the length direction is bored in the peripheral wall of the flat tube 1, and the end of the flat tube 1 is inserted into the hole and brazed. Conventional header 3
As shown in FIG. 2, the width of the flat tube connection hole is formed to be constant from one end to the other end. In the conventional header 3, when the flat tube 1 is brazed to it, a brazing failure occurs between the length center of the side edge of the flat tube connection hole 6 and the width center of the flat tube 1. There was a problem. When we carefully observed the header 3 after brazing, we found that the header 3 was thermally deformed into a medium-thick shape, and the center of the length of the side edge of the flat pipe connection hole 6, as shown in FIG. It was discovered that a relatively large gap was created between the flat tube 1 and the width center part. This invention was made based on the above-mentioned discovery, and aims to provide a tubular header for a heat exchanger that can solve the above-mentioned problems. Means for Solving Problems The tubular header for a heat exchanger according to this invention has flat tube connection holes extending in the length direction of the tubular header, and a plurality of refrigerant passages are formed inside the flat tube connection holes. A tubular header used in a heat exchanger into which the end of a flat tube is inserted and brazed, and the width of the flat tube connection hole is narrowed at the center of the length of the flat tube connection hole. It is characterized by being gradually narrowed from both ends toward the center of the length. Embodiment Hereinafter, an embodiment of this invention will be described with reference to FIG. In the tubular header 3 for heat exchanger according to this invention,
The width of the flat tube connection hole 6 is gradually narrowed from both ends toward the center of the length so that the flat tube connection hole 6 is constricted at the center of the length. In this example,
The flat tube connection hole 6 is formed in an inclined straight line from the end of both side edges to the center of the length.
Both side edges of the flat tube connection hole 6 may be formed in an arc shape. Table 1 shows the header 3 (hereinafter referred to as header) in Figure 1 whose lengths A1 to E1 are as shown below, and the lengths A2 to E2 of each part are as shown below. Measurement of the length center part and width of each flat pipe connection hole 6 when the flat pipe 1 having the same cross-sectional shape is brazed to the header 3 (hereinafter referred to as header) in Fig. 2. It shows the results and the quality of the brazing. Header A1 (header diameter): 16mm B1 (header length): 105mm C1 (length of flat tube connection hole): 100mm D1 (width of end of flat tube connection hole): 5.1mm E1 (flat tube connection hole length): 100mm Pipe connection hole length (width at center): 5.0mm Header A2 16mm B2 105mm C2 100mm D2 5.1mm E2 5.1mm

[Table] Effects of the invention In the tubular header for a heat exchanger according to this invention, the width of the flat pipe connection hole gradually increases from both ends toward the center of the length so that the length of the flat pipe connection hole becomes constricted at the center of the length. This prevents a brazing failure from occurring between the center of the length of both edges of the flat tube connection hole and the center of the width of the flat tube when the flat tube is brazed to the header. be able to.

[Brief explanation of the drawing]

Figure 1 is a side view showing an embodiment of this invention, Figure 2 is a side view showing an embodiment of this invention.
The figure shows a side view of a conventional heat exchanger tubular header.
3 is a side view showing a state in which a flat tube is brazed to the header of FIG. 2, and FIG. 4 is a perspective view showing an example of an evaporator for a car cooler. 1...Flat tube, 3...Header, 6...Flat tube connection hole.

Claims (1)

[Scope of utility model registration request] A heat exchanger in which a flat tube connection hole extending in the length direction is drilled in the peripheral wall of a tubular header, and the end of the flat tube having a plurality of refrigerant passages inside is inserted into the flat tube connection hole and brazed. A heat exchanger in which the width of the flat tube connection hole is gradually narrowed from both ends toward the center of the length so that the flat tube connection hole is constricted at the center of the length. Dexterous tubular header.