Heat exchanger and water heater
A heat exchanger, water heater technology, applied in heat exchange equipment, water heaters, fluid heaters, etc., can solve the problems of volume expansion of residual water, deterioration of drainage performance, damage to fluid flow paths, etc., and achieve excellent drainage performance, excellent The effect of durability
Inactive Publication Date: 2018-09-04
RINNAI CORP
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Problems solved by technology
[0008] However, if the respective fluid flow paths are arranged approximately horizontally, since the fluid inlets and fluid outlets of the respective fluid flow paths are located at approximately the same height, the drainage performance of water from the fluid flow paths deteriorates.
In particular, among a plurality of fluid flow paths arranged in multiple stages, it is difficult to drain water in the fluid flow path at the lowest stage, and water tends to remain in the fluid flow path.
As a result, in the state where water remains in the fluid flow path, if the outside air temperature drops below 0°C in winter, the remaining water will freeze and the volume of the remaining water will expand, and there is a risk of damage to the fluid flow path
Method used
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[0023] The heat exchanger 3 according to the embodiment of the present invention is assembled in a water heater 4 .
[0024] Such as figure 1 As shown, in the water heater 4, a gas burner 50 with a downwardly facing combustion surface is arranged in the upper region. Further, below the gas burner 50, a substantially rectangular box-shaped casing 30 in which the heat exchanger 3 is provided is connected. Further, an exhaust passage 31 is connected to the lower portion of the casing 30 for guiding combustion exhaust gas fed in from the gas burner 50 to the outside of the water heater 4 .
[0025] Above the gas burner 50 , a fan unit 5 is connected, which sends air outside the water heater 4 as combustion air for the gas burner 50 . The combustion exhaust gas discharged from the gas burner 50 is sent into the heat exchanger 3 by the fan unit 5 , and is discharged from the casing 30 to the outside of the water heater 4 through the exhaust passage 31 .
[0026] The water supplie...
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The invention relates to a heat exchanger (3) including a plurality of fluid flow paths (401), (402), (403) arranged in a plurality of stages in a height direction, wherein a fluid inlet port (13a) and a fluid outlet port (13b) of the fluid flow path (403) located at a lowermost stage among the plurality of fluid flow paths (401), (402), (403) have larger flow path cross-sectional areas than a fluid inlet port (11a) and a fluid outlet port (11b) of the fluid flow path (401) located at an uppermost stage.
Description
technical field [0001] The present invention relates to a heat exchanger for heat-exchanging and heating a fluid to be heated flowing through a plurality of fluid passages arranged in multiple stages in the height direction by using combustion exhaust gas, and a water heater (water heater) equipped with the heat exchanger. Background technique [0002] Conventionally, there is known a water heater in which a secondary heat exchanger as a latent heat exchanger, a main heat exchanger as a sensible heat exchanger, and a gas burner are arranged in order from above in a tank (Japanese Patent Laid-Open Publication No. Open No. 2002-327960). In this water heater, along the side wall of the tank between the main heat transfer tube of the main heat exchanger and the gas burner, coiled water pipes are arranged as part of the fluid flow path through which the heated fluid flows. [0003] The heated fluid such as water sent from the water supply pipe flows from the sub heat transfer pi...
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IPC IPC(8): F24H9/00F28D7/00
CPCF24H9/0005F28D7/0066F24H1/14F24H1/40F28D1/05333F28F9/0246F28F17/00F28D1/04F28F1/02F28F21/083
Inventor 三浦卓也中越贵章
Owner RINNAI CORP