Water Heater

Patent metadata

Field	Value
Publication number	US-2016010891-A1
Application number	US-201514728068-A
Country	US
Kind code	A1
Filing date	Jun 2, 2015
Priority date	Jul 11, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

A drainage water discharge pipe is connected to a secondary heat exchanger for discharging drainage water to the outside of the secondary heat exchanger. An air passage pipe is connected to an exhaust box. A three-way pipe joint allows merging of a flow path on a side of the drainage water discharge pipe and a flow path on a side of the air passage pipe, and allows connection of the merged flow path to a drainage water tank connection pipe. In the three-way pipe joint, the flow path on the side of the air passage pipe is greater in diameter than the flow path on the side of the drainage water discharge pipe, and the flow path on the side of the drainage water tank connection pipe is decreased in diameter after merging of the drainage water discharge pipe and the air passage pipe.

First claim

What is claimed is:

1 . A water heater of a latent heat recovery type, capable of heating water by recovering latent heat of combustion gas, comprising:
a burner which generates combustion gas; a heat exchanger which heats water which flows through inside, through heat exchange with combustion gas produced in the burner; a fan which suctions combustion gas which has passed through the heat exchanger and emits combustion gas to outside of the water heater; a drainage water discharge pipe which is connected to the heat exchanger and discharges drainage water produced as a result of recovery of latent heat by the heat exchanger to the outside of the heat exchanger; an air passage pipe connected to a path for flow of combustion gas from the heat exchanger to the fan; and a pipe connection portion which allows merging of the drainage water discharge pipe and the air passage pipe and connection of a merged flow path to a discharge path leading to the outside of the water heater, in the pipe connection portion, a flow path on a side of the air passage pipe being greater in diameter than a flow path on a side of the drainage water discharge pipe and a flow path on a side of the discharge path being decreased in diameter after merging of the flow path on the side of the drainage water discharge pipe and the flow path of the air passage pipe.

2 . The water heater according to claim 1 , wherein
in the pipe connection portion, the flow path on the side of the discharge path extends in parallel to the flow path on the side of the air passage pipe.

3 . The water heater according to claim 1 , wherein
in the pipe connection portion, the flow path on the side of the discharge path extends orthogonal to the flow path on the side of the drainage water discharge pipe.

4 . The water heater according to claim 1 , further comprising an exhaust box forming at least a part of the path for flow of combustion gas between the heat exchanger and the fan, wherein
the air passage pipe is connected to the exhaust box.

5 . A water heater of a latent heat recovery type, capable of heating water by recovering latent heat of combustion gas, comprising:
a burner which generates combustion gas; a heat exchanger which heats water which flows through inside, through heat exchange with combustion gas produced in the burner; a fan which suctions combustion gas which has passed through the heat exchanger and emits combustion gas to outside of the water heater; a drainage water discharge pipe connected to a drainage water discharge port provided in the heat exchanger; an air passage pipe connected to an air suction port provided in a path for flow of combustion gas from the heat exchanger to the fan; and a pipe connection portion which has a flow path allowing merging of the drainage water discharge pipe and the air passage pipe and connection of the merged flow path to a discharge path leading to the outside of the water heater, the pipe connection portion being arranged such that a height position in the pipe connection portion where a flow path on a side of the drainage water discharge pipe and a flow path on a side of the air passage pipe merge with each other is lower than a height position of the air suction port and a hydraulic head pressure originating from a height difference between the height position where merging is achieved and the height position of the air suction port is higher than an absolute value of a maximum negative pressure generated at the air suction port.

6 . The water heater according to claim 5 , wherein
the pipe connection portion is arranged such that the height position where merging is achieved is lower than a height position of the drainage water discharge port and a hydraulic head pressure originating from a height difference between the height position where merging is achieved and the drainage water discharge port is higher than the absolute value of the maximum negative pressure generated at the air suction port.

7 . The water heater according to claim 5 , further comprising an exhaust box forming at least a part of the path for flow of combustion gas between the heat exchanger and the fan, wherein
the air suction port is provided in the exhaust box.

8 . The water heater according to claim 5 , wherein
the pipe connection portion is a pipe joint allowing merging of the drainage water discharge pipe and the air passage pipe.

9 . The water heater according to claim 5 , wherein
the fan includes a blade, a drive source, and a rotation shaft connecting the blade and the drive source to each other, and the air passage pipe opens into a region opposed to a direction of an axis line of the rotation shaft of the blade in the path for flow of combustion gas from the heat exchanger to the fan.

Assignees

• Noritz Corp

Inventors

• Wada Norihide

Classifications

• F24H9/1836

  using fluid fuel · CPC title

• F24H9/128

  Mechanical Engineering · mapped topic

• F24H1/145

  using fluid fuel · CPC title

• F24H8/006 Primary

  Means for removing condensate from the heater · CPC title

• Y02B30/00

  Energy efficient heating, ventilation or air conditioning [HVAC] · CPC title