Hot water supplyer

Abstract

A hot water supply apparatus in which an air supply chamber 5 communicated with an air supply passage 8 of a supply-discharge pipe 6 is provided above a combustion chamber 4 storing a burner 2 and the heat exchanger 3 for supplying hot water in a housing 1, outside air is supplied as combustion air to the combustion chamber through the air supply passage, the air supply chamber and the internal space of the housing by a combustion fan 9, and the heat exchanger 14 for cooling interposed in a by-pass passage 13 in parallel to the heat exchanger for supplying hot air is disposed in the air supply chamber 5, thereby cooling the air flowing into the housing. A conflux part 13b of the by-pass passage 13 and a hot water delivery passage 12 is positioned below a branch part 13a of the by-pass passage 13 and a water supply passage in the vertical direction.

Description

technical field [0001] The present invention relates to a water heater having an air supply and exhaust pipe, and a combustion air blower is used to supply combustion air and discharge combustion exhaust through the air supply and exhaust pipe. Background technique [0002] As this water heater, the applicant has previously applied for such as image 3 The water heater shown is disclosed in Japanese Patent Application No. 2003-113734 (the application number in China is 03123727.4) bulletin. The water heater of this prior application has: a casing 1, a combustion chamber 4 arranged in the casing 1 and containing a burner 2 and a heat exchanger 3 for hot water supply heated by the burner 2, located in the The upper position of the combustion chamber 4 is disposed in the housing 1 and communicates with the air supply chamber 5 of the inner space of the housing 1, and communicates with the air supply chamber through the inner pipe 6a that communicates with the combustion chamber...

AI Technical Summary

Problems solved by technology

[0009] However, in the case of a water heater having the cooling heat exchanger 14 of the above-mentioned prior application, as described above, image 3 As shown, if the confluence portion 13b of the bypass passage 13 and the hot water outlet passage 12 is located at the upper position in the vertical direction relative to the branch portion 13a of the bypass passage 13 and the water supply passage 11, when the hot water outlet stops, Using the heat exchanger 3 for hot water supply, the high-temperature hot water that boils later is transferred to the heat exchanger 14 for cooling. When the hot water is discharged again, the temperature of the hot water will increase.

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