A spiral plate heat exchanger and its welding method

Abstract

The invention discloses a spiral board type heat exchanger. The spiral board type heat exchanger comprises a cylindrical shell body and a heat exchange device arranged in the shell body. The heat exchange device comprises a first heat exchange board, a second heat exchange board and a spacing column, wherein the first heat exchange board and the second heat exchange board are spiral and wind mutually, and the spacing column is arranged between the first heat exchange board and the second heat exchange board. The shell body comprises a semi-cylindrical first shell body and a semi-cylindrical second shell body which are welded mutually. The outer ends of the first heat exchange board and the second heat exchange board are welded to the inner surface of the first shell body. Due to the fact that the outer ends of the first heat exchange board and the second heat exchange board are welded to the inner surface of the first shell body, a connecting board adopted in the prior art is omitted, stress can be reduced to a greater degree, and the service life of the heat exchanger is prolonged. Meanwhile, compared with the prior art, the welding method reduces the welded joint filling amount, the labor intensity of a welder is reduced, and the welding cost is saved.

Description

technical field [0001] The invention relates to the field of heat exchangers, in particular to a spiral plate heat exchanger and a welding method thereof. Background technique [0002] The existing spiral plate heat exchanger is rolled by two parallel metal plates to form two independent spiral channels, and two fluids with different temperatures exchange heat through the metal walls. Existing spiral plate heat exchangers are divided into Type I non-detachable type, Type II detachable type and Type III through-type heat exchanger according to the sealing conditions of their passages. At present, no matter what kind of structure it is, the semi-cylindrical body and the spiral plate are welded together through a connecting plate. as attached Figure 6-7 A spiral plate heat exchanger shown includes a first shell 11, a second shell 12, a first heat exchange plate 21, a second heat exchange plate 22, a first connecting plate 71 and a second connecting plate 72, Wherein, one sid...

AI Technical Summary

Problems solved by technology

In order to ensure the welding strength of the first shell 11, the second shell 12 and the first connecting plate 71, a large amount of filling is required for the weld seam, resulting in an unsightly shape of the weld seam and a large welding stress. The heater is prone to damage during long-term use

The welding of the first connecting plate 71 and the first heat exchange plate 21 needs to be welded on both sides of the first connecting plate 71, the labor intensity of the welding is high, and the work efficiency is low, and, in the process of testing the airtightness of the weld seam, there are only two weld seams Only when there are gaps can it be detected. If only one side of the weld has gaps, there is a risk of liquid leakage during the use of the heat exchanger

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