Dual venturi for combustion apparatus

Patent metadata

Field	Value
Publication number	US-10393370-B2
Application number	US-201314378970-A
Country	US
Kind code	B2
Filing date	Jan 18, 2013
Priority date	Feb 15, 2012
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

Provided is a dual venturi for a combustion apparatus that is capable of effectively controlling calorific power since the amount of gas for a burner provided in a water heater and the amount of supplied air are controlled in two phases, and a motor and a damper are coupled to each other so that the damper opens or blocks inlets for secondary air and the gas at the same time that the damper is rotated by the driving of the motor.

First claim

The invention claimed is:

1. A dual venturi for a combustion apparatus, comprising: a housing configured as a cylindrical duct, divided therein by a partition wall to have a primary passage and a secondary passage, and having a primary gas inlet pipe formed at a side portion of the primary passage;
a damper located within the secondary passage of the housing to open and close a flow of secondary air along with rotation of the damper, the damper including a hollow cylindrical portion and a damper hole disposed on the hollow cylindrical portion at a first circumference thereof;
a secondary gas inlet pipe fixed to the housing and having one end engaged with the damper inside the hollow cylindrical portion and having a secondary gas outlet formed at a second circumference thereof, wherein the first circumference is located in line with the second circumference in a lateral direction, secondary gas being introduced into the other end of the secondary gas inlet pipe, the secondary gas outlet selectively communicating with the damper hole according to a rotation angle of the damper when the damper rotates with respect to the secondary gas inlet pipe; and
a motor disposed outside the housing and having a rotary shaft coupled to the damper such that the damper is rotated, wherein the damper includes a first protrusion piece protrudingly formed at an inner side of a central portion of the damper, the first protrusion piece having a first protrusion and a first recess continuously connected to the first protrusion, and wherein the secondary gas inlet pipe includes:
a moving body moving upward or downward along an inner peripheral surface of the secondary gas inlet pipe along with rotation of the damper, the moving body having a second protrusion piece, the second protrusion piece having a second protrusion and a second recess continuously connected to the second protrusion, wherein the second protrusion piece is formed to engage with the first protrusion piece and the first recessed portion formed on an outer peripheral surface thereof so that the secondary gas flows in an inner wall of the secondary gas inlet pipe;
a spring for elastically supporting the moving body; and
a spring fixing portion coupled to an upper portion of the moving body to support the spring, the spring fixing portion having a second recessed portion formed on a circumference thereof so as to form a passage so that the secondary gas flows in the inner wall of the secondary gas inlet pipe,
wherein the flow of the secondary gas is blocked when the second protrusion piece of the moving body engages with the first protrusion piece, and
wherein, when the moving body is moved upward by rotation of the damper while the second protrusion piece and the first protrusion piece are changed from a position at which the first recess and the second protrusion are in contact with each other to a position at which the first and second protrusions are in contact with each other, the secondary gas flows between an inner wall surface of the secondary gas inlet pipe and the first and second recessed portions respectively formed at the moving body and the spring fixing portion.

2. The dual venturi of claim 1 , wherein the moving body further comprises a sealing member for sealing a portion coming into contact with the secondary gas inlet pipe.

3. The dual venturi of claim 1 , wherein the motor is a synchronous motor.

Assignees

• Kyungdong Navien Co Ltd

Inventors

• Yu Jeong Gi

Classifications

• F23N1/027

  using mechanical means · CPC title

• F23D14/46 Primary

  Details · CPC title

• F23D14/62

  Mixing devices; Mixing tubes · CPC title

• F23D14/60

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

• F23D14/04 Primary

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