Liquid-liquid heat exchanger

Abstract

The present invention provides a liquid-liquid heat exchanger comprising a first flow channel where a heat medium heated by the heat exchanger applying a burner mounted on a heat source machine as its heat source flows, and a second flow channel where heated liquid flows, and heating the heated liquid by the heat medium. Three sheets of press-formed plates composed of first and second outer plates 71, 72 and an intermediate plate 73 held between the outer plates are overlapped. The first flow channel 74 having the bent-pipe shape is formed between the first outer plate 71 and the intermediate plate 73, and the second flow channel 75 having the bent-pipe shape, is formed between the second outer plate 72 and the intermediate plate 73 so as to overlap the first flow channel 74 through the intermediate plate 73. The invention miniaturizes a liquid-liquid heat exchanger and to reduce its cost.

Description

technical field [0001] The invention relates to a liquid-liquid heat exchanger, which has: a first flow passage, which circulates a heat carrier heated by a heat exchanger provided in a heat source machine as a heat source; a second flow passage, which circulates The liquid to be heated heats the liquid to be heated flowing in the second flow path by passing through the heating medium flowing in the first flow path. Background technique [0002] As is well known, conventionally, in a heat source machine having heat exchangers for hot water supply and heating using a burner as a heat source, a liquid-liquid heat exchanger having a first flow passage and a second flow passage is provided, thereby enabling The additional heating of the bath water is carried out, wherein the first flow path flows a heating medium such as antifreeze heated by the heating heat exchanger, and the second flow path flows bath water. [0003] Here, the liquid-liquid heat exchanger for additional heat...

AI Technical Summary

Problems solved by technology

At this time, it is necessary to simultaneously bend the inner tube and the outer tube while maintaining the concentricity, but this operation is extremely difficult.

In particular, if the double pipe is bent with a small radius of curvature, the concentricity of the inner pipe and the outer pipe is extremely deteriorated, so the radius of curvature of the double pipe cannot be increased.

Therefore, it is impossible to precisely bend the double-layer pipe with a small radius of curvature, and to make the outer dimensions compact

[0004] In addition, in the manufacture of liquid-liquid heat exchangers, in addition to reducing the diameter of the outer tube, expanding the diameter of the inner tube, and bending the double-layer tube, it is also necessary to form a flow channel near both ends of the outer tube by cutting. The inflow port and outflow port of the liquid in the second flow path cause many man-hours and high cost problems

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