Hot water supplyer

Abstract

A water heater, in which a housing (1) is provided above a combustion chamber (4) containing a burner (2) and a heat exchanger (3) for hot water supply and communicated with the air supply and exhaust. The air supply chamber (5) of the air supply path (8) of the pipe (6); the air is supplied to the combustion chamber as combustion air through the air supply path, the air supply chamber and the internal space of the housing through the combustion blower (9), And in the air supply chamber, a cooling heat exchanger (14) interposed on the bypass pipe (13) of the heat exchanger for hot water supply is arranged to cool the air flowing into the housing; At the time of stop, the high-temperature hot water boiled later by the hot water supply heat exchanger is transferred to the cooling heat exchanger to suppress the overheating of the outlet hot water temperature when the hot water is re-ejected. The confluence part (13b) of the bypass passage and the hot water outlet passage (12) is located at a vertically lower position relative to the branch part (13a) of the bypass passage and the water supply passage.

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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