Dual venturi for combustion device

Patent metadata

Field	Value
Publication number	US-10047952-B2
Application number	US-201414774423-A
Country	US
Kind code	B2
Filing date	Apr 15, 2014
Priority date	Apr 16, 2013
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A dual venturi for a combustion device that can control the quantities of gas and air supplied to the burner of a water heater and in which a motor is combined with a damper so as to simultaneously open and close the inlets for secondary air and gas and efficiently control the quantity of heat, in order to increase the turn-down ratio. The dual venturi includes: a housing having a discharge part coupled to a turbo fan; an air supply unit divided into first and second air supply units; a gas supply unit divided into first and second gas supply units communicating with the first and second air supply units; and an opening and closing unit that blocks the flow of secondary air and secondary gas when needing a low quantity of heat, and opens both the second air supply unit and the second opening when needing a high quantity of heat.

First claim

The invention claimed is:

1. A dual venturi for a combustion device, the dual venturi comprising:
a housing having at one side thereof a discharge part coupled to a turbo fan, and in an interior thereof a predetermined space for allowing gas and air to flow;
an air supply unit defined in the interior of the housing and divided by a first partition into a first air supply unit and a second air supply unit;
a gas supply unit provided on another side of the housing and divided by a second partition into a first gas supply unit having a first opening so as to communicate with the first air supply unit and a second gas supply unit having a second opening so as to communicate with the second air supply unit; and
an opening and closing unit including:
a motor provided outside the housing;
a damper connected with the motor, the damper having at least two concave guides and at least two convex guides on an inner surface thereof;
a movable body having at least two concave guides and at least two convex guides that are correspondingly engaged respectively with the at least two concave guides and the at least two convex guides of the damper; and
a valve body connected with a center of the movable body, and opening and closing the second opening in response to movement of the movable body,
wherein the valve body is configured to close the second opening when the damper closes the second air supply unit, and to open the second opening when the damper opens the second air supply unit.

2. The dual venturi for the combustion device according to claim 1 , wherein the movable body further includes an inner housing at a position outside the movable body, the inner housing guiding the movement of the movable body and having a gas discharge hole directed toward the discharge part.

3. The dual venturi for the combustion device according to claim 2 , wherein the movable body further includes a spring, a first end of the spring being in contact with an outer surface of the movable body and another end of the spring being in contact with an inner surface of the inner housing so that the spring elastically supports the movable body.

4. The dual venturi for the combustion device according to claim 1 , wherein the valve body is made of a rubber or a silicone material so as to increase a contact force with the movable body.

5. The dual venturi for the combustion device according to claim 1 , wherein the motor is a synchronous motor.

6. The dual venturi for the combustion device according to claim 1 , wherein the motor further includes a limit switch to rotate the damper at 90 degree angles.

7. The dual venturi for the combustion device according to claim 5 , wherein the motor further includes a limit switch to rotate the damper at 90 degree angles.

Assignees

• Kyungdong Navien Co Ltd
• Kyungdong Navien Co Ltd

Inventors

• Kim Kyeong Joo
• Kim Sung Ki

Classifications

• F23N5/00

  Systems for controlling combustion (regulating fuel supply F23N1/00, regulating air supply or draught F23N3/00) · CPC title

• F23N1/02 Primary

  conjointly with air supply · CPC title

• F23D14/04

  induction type, e.g. Bunsen burner · CPC title

• F23D14/60 Primary

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

• F24H9/2035

  using fluid fuel · CPC title