Dual venturi for combustor

Patent metadata

Field	Value
Publication number	US-10215404-B2
Application number	US-201314648904-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Dec 3, 2012
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

The present invention relates to a dual venturi for a combustor and, specifically, to a dual venturi for a combustor, which adjusts the amount of gas and air supplied to a burner of a hot water heater and has a motor combined with a damper in order to increase a turn-down ratio (TDR), such that the damper is rotated by the driving of the motor so as to simultaneously open or close secondary air and gas inlets, thereby enabling efficient heating control. The present invention has a separate opening/closing means which is capable of controlling, in two stages, the amount of air and gas flowing into the combustor such as the hot water heater, wherein the opening/closing means comprises the motor and the damper, and the damper is rotated by the driving of the motor so as to simultaneously open or close the secondary air and gas inlets, thereby enabling the control of the amount of air and gas.

First claim

The invention claimed is:

1. A dual venturi for a combustor, comprising:
a housing;
an air supply unit within the housing, the air supply unit comprising a first air supply unit and a second air supply unit separated from the first air supply unit by a first partition, the first partition formed with an opening/closing hole;
a gas supply unit formed on one side of the housing, the gas supply unit comprising a first gas supply unit and a second gas supply unit separated from the first air supply unit by a second partition, the first gas supply unit connected to the first air supply unit, the second gas supply unit connected to the second air supply unit through the opening/closing hole;
a damper rotatably disposed in the second air supply unit and configured to allow or block air flowing through the second air supply unit, the damper having a hollow cylindrical portion disposed within the second air supply unit, two or more first protrusions and first recesses which are relatively recessed with respect to the first protrusions alternatively disposed in the hollow cylindrical portion;
a moving body disposed in the hollow cylindrical portion, the moving body having second protrusions and second recesses that are respectively corresponding to the first protrusions and the first recesses and configured to, according to rotation of the damper, move in a first direction by contact of ends of the second protrusions with ends of the first protrusions and move in a second direction by ends of the second protrusions being disposed in the first recesses within the hollow cylindrical portion;
a valve connected to the moving body, the valve configured to allow flow of gas through the second gas supply unit into the second air supply unit by opening the opening/closing hole while simultaneously moving as the moving body moves in the first direction or block flow of gas flowing through the second gas supply unit into the second air supply unit by closing the opening/closing hole while simultaneously moving as the moving body moves in the second direction; and
a first spring disposed within the hollow cylindrical portion and connected to the moving body, and configured to provide a return force to the moving body in the second direction.

2. The dual venturi of claim 1 , further comprising:
a second spring disposed in the first partition and connected to the valve and configured to provide a return force to the valve in the second direction.

3. The dual venturi of claim 1 , wherein the valve further comprises a sealing member to maintain airtightness between the opening/closing hole and the valve.

4. The dual venturi of claim 1 , wherein when the opening/closing hole is open by a motion of the moving body in the first direction, the opening/closing hole is positioned between the moving body and the valve.

5. The dual venturi of claim 1 , wherein the first air supply unit and the second air supply unit each further comprise a removable internal housing for load adjustment on an inner side of the first air supply unit and an inner side of the second air supply unit, which can control an amount of air according to a heat capacity load required for combustion and is able to adjust a turn down ratio by the heat capacity load required form the combustion.

Assignees

• Kyungdong Navien Co Ltd

Inventors

• Lee Hyeon Sik
• Park Jun Kyu

Classifications

• F23N2235/16

  variable flow or proportional valves · CPC title

• F23N2235/18

  Groups of two or more valves · CPC title

• F23N2235/06

  at the air intake · CPC title

• F23N2235/10

  power assisted, e.g. using electric motors · CPC title

• F23D14/60 Primary

  Devices for simultaneous control of gas and combustion air · CPC title