Premixing apparatus

Patent metadata

Field	Value
Publication number	US-10495301-B2
Application number	US-201615751332-A
Country	US
Kind code	B2
Filing date	Jun 23, 2016
Priority date	Aug 25, 2015
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A premixing apparatus has: a fan; an air tube; and a gas tube inside the air tube; provided that a direction toward an air flow upstream side inside the air tube is defined as an X+ direction, an air adjusting valve facing an air inlet port positioned at an end, in the X+ direction, of the air tube; a gas adjusting valve facing a gas outlet port positioned at one end of the gas tube; and a common actuator driving the air adjusting valve and the gas adjusting valve. At an end, in the X− direction, of the gas tube, is disposed a valve seat having formed therein the gas outlet port, and a gas adjusting valve inside the gas tube. A valve stem penetrates through an end wall, in the X+ direction, of the gas tube. The gas adjusting valve is driven by the actuator through the valve stem.

First claim

The invention claimed is:

1. A premixing apparatus for mixing air with fuel gas, thereby supplying a burner with air-fuel mixture, the premixing apparatus comprising:
a fan for supplying air;
an air tube which is disposed on an upstream side or on a downstream side of the fan so that air flows therethrough,
wherein a longitudinal direction of the air tube is defined as an X-axis direction; in the X-axis direction, the direction looking toward an upstream side of air flow is defined as an X-axis plus direction; and the direction looking toward a downstream side of the air flow is defined as an X-axis minus direction;
a gas tube which is connected to a downstream end of a gas supply passage for supplying the fuel gas and which is disposed inside the air tube;
an air adjusting valve lying opposite to an air inlet port which is positioned at an end part, in the X-axis plus direction, of the air tube, in a manner to be linearly movable back and forth in the X-axis direction to thereby vary an opening degree of the air inlet port;
a gas adjusting valve lying opposite to a gas outlet port which is positioned at a first end part, in the X-axis minus direction, of the gas tube, in a manner to be linearly movable back and forth in the X-axis direction to thereby vary an opening degree of the gas outlet port; and
a common actuator which drives in the X-axis direction both the air adjusting valve and the gas adjusting valve
wherein the gas tube has an end wall part at a second end part thereof, opposite from the first end part in the X-axis plus direction,
wherein at the first end part, in the X-axis minus direction, of the gas tube, there is disposed a valve seat for the gas adjusting valve, the valve seat having formed therein the gas outlet port, the gas adjusting valve being disposed inside the gas tube, and
wherein a valve stem is disposed so as to be extended from the gas adjusting valve to penetrate through the end wall part, in the X-axis plus direction toward the actuator, such that the gas adjusting valve is driven via the valve stem by the actuator in the X-axis direction.

2. The premixing apparatus according to claim 1 , the common actuator connects with direct contact both to the air adjusting valve and the gas adjusting valve.

Assignees

• Rinnai Kk

Inventors

• Nonoyama Masao

Classifications

• F23D14/34

  Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air · CPC title

• F23D14/02 Primary

  Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone · CPC title

• F23D14/62 Primary

  Mixing devices; Mixing tubes · CPC title

• F23N1/02

  conjointly with air supply · CPC title

• F23L13/00

  Construction of valves or dampers for controlling air supply or draught · CPC title