Combustion apparatus having air intake preheater

Patent metadata

Field	Value
Publication number	US-9702589-B2
Application number	US-201414648898-A
Country	US
Kind code	B2
Filing date	Jan 8, 2014
Priority date	Jan 18, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

The present invention relates to a combustion apparatus capable of reducing the combustion load of a burner and improving the combustion efficiency thereof. The combustion apparatus includes: a premixing chamber for premixing external air, introduced through an air supply inlet, with a combustion gas; a blower for supplying a mixed air premixed in the premixing chamber toward a burner; a combustion chamber for burning the mixed air by ignition of the burner; a heat exchanger for heat exchange with room heating water by using the combustion heat of the combustion chamber; an exhaust gas discharging part for discharging an exhaust gas having passed through the heat exchanger; and a duct through which the exhaust gas having passed through the exhaust gas discharging part is discharged outside, wherein the combustion apparatus includes an air intake preheater for heat exchange between the exhaust gas discharged to the duct through the exhaust gas discharging part and the air supplied to the premixing chamber through the air supply inlet, the air intake preheater including a channel-forming member in which a plurality of unit plates are stacked with a predetermined interval therebetween to form an exhaust gas channel and an air intake channel therein that are separated from each other, are adjacent to each other, and are alternately arranged.

First claim

The invention claimed is:

1. A combustion apparatus having an air intake preheater, the combustion apparatus comprising:
a premixing chamber in which external air introduced through an air intake hole 120 is pre-mixed with a combustion gas;
a blower supplying mixed-gas that is pre-mixed in the premixing chamber to a burner;
a combustion chamber in which the mixed-gas is burnt by ignition of the burner;
a heat exchanger in which water is heat-exchanged with combustion heat of the combustion chamber;
an exhaust gas discharge part through which an exhaust gas passing through the heat exchanger is discharged;
a duct through which the exhaust gas passing through the exhaust gas discharge part is discharged to the outside; and
an air intake preheater in which the exhaust gas discharged from the duct through the exhaust gas discharge part is heat-exchanged with the air supplied to the premixing chamber through the air intake hole,
wherein the preheater comprises a channel defining member in which a plurality of unit plates are stacked on each other in a predetermined distance to adjacently alternately define exhaust gas channels and air intake channels separated from each other therein,
wherein each of the unit plates is constituted by a first plate and a second plate bonded to each other so that the exhaust gas channel is defined therein, and
an exhaust gas channel is connected between the first plate and the second plate of the unit plates disposed adjacent to each other by an exhaust gas channel connection member, and
an exhaust gas introduction tube and an exhaust gas discharge tube are connected to the exhaust gas channel connection member are defined in one side of the unit plate, and
the air intake channel is defined in a space between the unit plates disposed adjacent to each other.

2. The combustion apparatus of claim 1 , wherein first protrusions and second protrusions respectively protrude from the first plate and the second plate on positions corresponding to each other at a predetermined distance so that protruding surfaces contact each other, and
each of the first protrusions and the second protrusions between the unit plates disposed adjacent to each other has the same height as that of the exhaust gas channel connection member.

3. The combustion apparatus of claim 2 , wherein the air intake preheater comprises a housing in which the channel defining member is mounted therein, and
an air intake hole to which external air is introduced and an air supply tube from which the preheated air is discharged are respectively disposed on upper and lower ends of the housing, and
an exhaust gas introduction hole communicating with the exhaust gas introduction tube and an exhaust gas discharge hole communicating with the exhaust gas discharge tube are respectively defined in an one lower surface and an one upper surface of the housing.

4. The combustion apparatus of claim 1 , wherein the exhaust gas introduction tube and the exhaust gas discharge tube are vertically spaced apart from each other in one side surface of the unit plate disposed at one side of the unit plates.

5. The combustion apparatus of claim 4 , wherein a fixing member closely attached to an inner surface of the housing to isolate the air intake channels between the unit plates adjacent to each other from each other is disposed on an edge of each of the plurality of unit plates.

6. The combustion apparatus of claim 1 , wherein the first plate and the second plate have convex shapes in an opposite direction, and
a first flange part disposed on an outer end of the first plate is coupled to a second flange part disposed on an outer end of the second plate, by welding.

7. The combustion apparatus of claim 1 , wherein a flow direction of the exhaust gas passing through the exhaust gas channel and a flow direction of the air passing through the air intake channel are defined in a counterflow direction.

8. The combustion apparatus of claim 7 , wherein the premixing chamber is divided into a first passage and a second passage by a partition member therebetween, and
the combustion gas introduced through the gas supply part is supplied to a first gas introduction hole connected to the first channel and a second gas introduction hole connected to the second channel, and
a flow passage of the air and the gas passing through the first passage is in an opened state all the time, and
a flow passage of the air passing through the second passage and a flow passage of the gas, which is connected to the second passage through the second gas introduction hole are opened and closed by a mixed-gas adjusting part.

9. The combustion apparatus of claim 1 , wherein the premixing chamber has a venturi shape having a throat part reduced in section area between an inlet and outlet through which the air passes, and
a gas supply part supplying a combustion gas and a recirculation tube are connected to the throat part of the premixing chamber so that a portion of the exhaust gas passing through the heat exchanger is introduced thereto in proportional to a pressure difference according to a flow amount of the mixed-gas passing through the throat part.

Assignees

• Kyungdong Navien Co Ltd

Inventors

• Kim Young Mo

Classifications

• G01F17/00 Primary

  Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies (measuring linear dimensions to determine volume G01B) · CPC title

• G01D13/12

  Graduation · CPC title

• F24H1/145

  using fluid fuel · CPC title

• F23C7/002

  the air being submitted to a rotary or spinning motion (cyclonic combustion chamber F23C3/006) · CPC title

• F24H9/0084 Primary

  Combustion air preheating · CPC title