Water heater

Patent metadata

Field	Value
Publication number	US-9404670-B2
Application number	US-201414561068-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Dec 25, 2013
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A fan serves to suction combustion gas which has passed through a secondary heat exchanger and emitting combustion gas to the outside of a water heater. A drainage water discharge pipe is connected to the secondary heat exchanger in order to discharge the drainage water produced as a result of recovery of latent heat in the secondary heat exchanger to the outside of the secondary heat exchanger. An air passage pipe is connected to an exhaust box. A Y-shaped pipe joint has a flow path allowing merging of the drainage water discharge pipe and the air passage pipe, and the flow path after merging leads to the outside of the water heater.

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 said burner;
a fan which suctions combustion gas which has passed through said heat exchanger and emits combustion gas to outside of said water heater;
a drainage water discharge pipe which is connected to said heat exchanger and discharges drainage water produced as a result of recovery of latent heat by said heat exchanger to the outside of said heat exchanger;
an air passage pipe connected to a path for flow of combustion gas from said heat exchanger to said fan; and
a pipe connection portion which has a flow path allowing merging of said drainage water discharge pipe and said air passage pipe, said flow path after merging leading to the outside of said water heater.

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

3. The water heater according to claim 2 , wherein
an inner diameter of said air passage pipe is set to be greater than an inner diameter of said drainage water discharge pipe.

4. The water heater according to claim 2 , wherein
said pipe connection portion is a pipe joint allowing merging of said drainage water discharge pipe and said air passage pipe,
said water heater further comprises a tank connection pipe connected to said pipe joint and a drainage water tank connected to said pipe joint with said tank connection pipe being interposed,
an inner diameter of said tank connection pipe is set to be greater than an inner diameter of said drainage water discharge pipe.

5. The water heater according to claim 2 , wherein
said pipe connection portion is a drainage water tank allowing merging of said drainage water discharge pipe and said air passage pipe, and
said drainage water discharge pipe and said air passage pipe are connected to said drainage water tank as being separate from each other.

6. The water heater according to claim 2 , wherein
said pipe connection portion is a pipe joint allowing merging of said drainage water discharge pipe and said air passage pipe, and
said water heater further comprises a trap pipe which is connected to said pipe joint and has a drain trap which can water-seal said flow path with drainage water.

7. The water heater according to claim 2 , wherein
said pipe connection portion is a pipe joint allowing merging of said drainage water discharge pipe and said air passage pipe,
said water heater further comprises a fan drainage water drain pipe connected to said fan, for discharging drainage water in said fan to outside of said fan; a tank connection pipe connected to said pipe joint; and a drainage water tank connected to said pipe joint with said tank connection pipe being interposed, and
said fan drainage water drain pipe is connected to said drainage water tank as being separate from said drainage water discharge pipe.

8. The water heater according to claim 1 , wherein
said fan includes a blade, a drive source, and a rotation shaft connecting said blade and said drive source to each other, and
said air passage pipe opens into a region opposed to a direction of an axis line of said rotation shaft of said blade in said path for flow of combustion gas from said heat exchanger to said fan.

9. The water heater according to claim 1 , wherein
said air passage pipe is connected between said pipe connection portion and said heat exchanger.

10. The water heater according to claim 9 , wherein
said air passage pipe is connected at a position closer to said fan of said heat exchanger than said drainage water discharge pipe.

11. The water heater according to claim 1 , wherein
an inner diameter of said air passage pipe is set to be greater than an inner diameter of said drainage water discharge pipe.

12. The water heater according to claim 1 , wherein
said pipe connection portion is a pipe joint allowing merging of said drainage water discharge pipe and said air passage pipe,
said water heater further comprises a tank connection pipe connected to said pipe joint and a drainage water tank connected to said pipe joint with said tank connection pipe being interposed, and
an inner diameter of said tank connection pipe is set to be greater than an inner diameter of said drainage water discharge pipe.

13. The water heater according to claim 1 , wherein
said pipe connection portion is a drainage water tank allowing merging of said drainage water discharge pipe and said air passage pipe, and
said drainage water discharge pipe and said air passage pipe are connected to said drainage water tank as being separate from each other.

14. The water heater according to claim 13 , wherein
said drainage water tank includes a drainage water storage portion for storing drainage water and a drainage water discharge portion for discharging the drainage water in said drainage water storage portion to outside of said drainage water storage portion,
in said drainage water tank, a partition portion having a communication hole serves as partition between a first space into which said drainage water discharge pipe opens and a second space into which said air passage pipe opens,
an opening of said air passage pipe in said drainage water tank is located at a height position lower than a height position of a lower end portion of a drainage water discharge opening leading to said drainage water discharge portion provided in said drainage water storage portion, and
said second space is located downstream of said first space in a drainage water discharge path.

15. The water heater according to claim 1 , wherein
said pipe connection portion is a pipe joint allowing merging of said drainage water discharge pipe and said air passage pipe, and
said water heater further comprises a trap pipe which is connected to said pipe joint and has a drain trap which can water-seal said flow path with drainage water.

16. The water heater according to claim 1 , further comprising a fan drainage water drain pipe connected to said fan, for discharging drainage water in said fan to outside of said fan.

17. The water heater according to claim 16 , wherein
said fan drainage water drain pipe is connected between said fan and said heat exchanger, and
a drainage water drain port of said heat exchanger leading to said drainage water discharge pipe is located on an extension of said fan drainage water drain pipe in said heat exchanger.

18. The water heater according to claim 16 , wherein
said fan drainage water drain pipe is connected between said fan and said heat exchanger, and
said fan drainage water drain pipe is arranged so as to at least reach a drainage water drain port of said heat exchanger leading to said drainage water discharge pipe.

19. The water heater according to claim 1 , wherein
said pipe connection portion is a pipe joint allowing merging of said drainage water discharge pipe and said air passage pipe,
said water heater further comprises a fan drainage water drain pipe connected to said fan, for discharging drainage water in said fan to outside of said fan, a tank connection pipe connected to said pipe joint, and a drainage water tank connected to

Assignees

• Noritz Corp

Inventors

• Kimura Sakiko
• Oohigashi Takeshi
• Kuriyama Yasutaka
• Kameyama Shuji

Classifications

• Y02B30/106

  Cross-Sectional Technologies · mapped topic

• F24H1/43

  helically or spirally coiled · CPC title

• F24H9/0026

  in combustion gas channels · CPC title

• F23L17/005

  using fans · CPC title

• F24H8/006 Primary

  Means for removing condensate from the heater · CPC title