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However, in order to ensure sufficient pressure resistance, it is necessary to increase the thickness of the header portion 102 where the tube 101 is inserted through the inner half, which results in an increase in the weight of the header.
Therefore, it is difficult to reduce the weight of the header
Method used
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example 1
[0058] Prepare hollow headers. The manifold comprises: an inner peripheral wall portion 10 having a substantially flattened arcuate cross-sectional shape to which pipes are connected; an outer peripheral wall portion 11 having a substantially semicircular cross-section shape, and facing the inner peripheral wall portion 10; and connecting curved peripheral wall portions 12 and 12, the connecting curved peripheral wall portions 12 and 12 are connected with the inner peripheral wall portion 10 and the outer peripheral wall portion 11, and the header satisfies the following conditions.
[0059] Then, the condenser shown in Fig. 3 was fabricated using the aforementioned hollow headers.
[0060] Condition A: r=10mm;
[0061] Condition B: Ra=60mm;
[0062] Condition C: Rb=4mm;
[0063] Condition D: h=5mm; and
[0064] Condition E: T=1.3mm
[0065] Assuming a stress of 100% developed in a normal circular header, the stress developed in this header is 163%. Therefore, in this ex...
example 2
[0068] In Example 2, the same structure as Example 1 is used, but the conditions are set as follows:
[0069] Condition A: r=7.94mm;
[0070] Condition B: Ra=50mm;
[0071] Condition C: Rb=4mm;
[0072] Condition D: h=4mm; and
[0073] Condition E: T=1.1mm
[0074] Assuming a stress of 100% developed in a normal circular header, the stress developed in this header is 146%. Therefore, in this example, it was proved that the generated stress can be suppressed to be small and sufficient pressure resistance can be obtained.
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Abstract
A heat exchanger comprises a header (2) and a plurality of tubes (1) connected to the header. The manifold (2) comprises: an inner peripheral wall portion (10) having a generally flat arcuate cross-sectional shape to which the tube (1) is connected; an outer peripheral wall portion (11), the outer peripheral wall portion (11) has a substantially semicircular cross-sectional shape, the outer peripheral wall portion (11) faces the inner peripheral wall portion (10); and the inner peripheral wall portion (10) and the The curved peripheral wall portion (12) connected to the peripheral wall portion (11) is connected. The parameters of the header (2) such as the outer radius of curvature Ra of the inner peripheral wall portion (10), the outer curvature radius Rb of the connecting curved peripheral wall portion (12), and the outer curvature radius of the outer peripheral wall portion (11) fall within a specific range, This reduces the header volume and weight while ensuring sufficient pressure resistance.
Description
[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 60 / 302,686, filed July 5, 2001. technical field [0003] The present invention relates to a heat exchanger suitable for use as a condenser used in automobile air conditioning systems, house air conditioning systems and the like. Background technique [0004] In recent years, so-called multi-flow heat exchangers have been widely used, for example, in automotive air-conditioning condensers. In some condensers, such as Figure 4A As shown, a header 100 having a circular cross-sectional shape is used to withstand the high pressure of the refrigerant passing through the condenser. On the other hand, if Figure 4B As shown, a joint type header formed by connecting two header halves 102 and 103 is also widely used. [0005] Incidentally, since the header does not contribute to heat exchange and forms a so-called dead space, it is desirable that the header v...
Claims
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