Heat exchanger, water heater and water tube
a technology of heat exchanger and water heater, which is applied in the direction of fluid heater, indirect heat exchanger, lighting and heating apparatus, etc., can solve the problems of reducing the height of the helical tube body, affecting the use of water heaters provided with heat exchangers, and affecting the use of water heaters. the effect of height reduction
Inactive Publication Date: 2007-12-20
NORITZ CORP
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- Abstract
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- Application Information
AI Technical Summary
Benefits of technology
[0006]An object of the present invention is to solve or alleviate the above-described problems.
Problems solved by technology
However, the above-described conventional structure has the following problems.
Thus, the conventional structure has a drawback that the overall height of the helical tube body 9 becomes considerably large when the number of loops 90 is increased to increase the amount of heat recovery.
In cold season, for example, the use of a water heater provided with a heat exchanger may be stopped for a long time.
Method used
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Embodiment Construction
[0025]Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
[0026]FIGS. 1-6 show an example of water heater and the related structure according to the present invention. In these figures, the arrow V indicates the vertical direction, whereas the arrow H indicates the horizontal direction.
[0027]As better shown in FIG. 1, the water heater A of this embodiment includes a burner 3, a primary heat exchanger 1 and a secondary heat exchanger B. The secondary heat exchanger B is an example of heat exchanger to which the present invention is applied.
[0028]The burner 3 is arranged in a casing 30 and burns gas supplied from the outside of the casing 30 through a pipe 32. A fan 31 is arranged below the casing 30 so that air for combustion is supplied from the fan 31 upward into the casing 30. The primary heat exchanger 1 is provided for recovering sensible heat from the combustion gas generated by the burner 3. The primary heat exchan...
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A water tube WT of a heat exchanger B includes a helical tube body 5 which includes a plurality of loops 50 arranged in the axial direction. At least one of the loops 50 includes an inclined tube portion which is inclined with respect to the axial direction and a non-inclined tube portion extending perpendicularly to the axial direction. The inclined tube portion is provided at each of opposite end regions s2a and s2b in a width direction crossing the axial direction, whereas the non-inclined tube portion is provided at an intermediate region S1 in the width direction. With this structure, the pitch p2 of the loops 50 is reduced. Therefore, by increasing the number of loops 50, high heat exchange efficiency is achieved without considerably increasing the size of the helical tube body 5.
Description
TECHNICAL FIELD[0001]The present invention relates to a heat exchanger for recovering heat from combustion gas by utilizing a water tube including a helical tube body to produce hot water. The invention also relates to a water heater provided with such a heat exchanger, and a water tube for a heat exchanger.BACKGROUND ART[0002]Examples of conventional heat exchanger are disclosed in Japanese Patent No. 2835286, Japanese laid-open patent publication No. 62-288446 and Japanese examined utility model publication No. 6-8442. In the heat exchanger disclosed in these documents, a helical tube body of a water tube is accommodated in a casing into which combustion gas is to be introduced. Heat is recovered from the combustion gas by the helical tube body, so that water supplied into the water tube is heated. As compared with a straight tube body, such a helical tube body has a larger heat transfer area. Therefore, with the heat exchanger, the amount of heat recovery can be increased while t...
Claims
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Login to View More IPC IPC(8): F24H9/02F28D21/00F28F1/10
CPCF24H1/40Y02B30/102F24H8/00F24H1/43Y02B30/00
Inventor AMADA, KEIICHI
Owner NORITZ CORP