Combustion – Timer – programmer – retarder or condition responsive control – By condition of burner feed or feed means
Patent
1989-03-27
1992-02-18
Price, Carl D.
Combustion
Timer, programmer, retarder or condition responsive control
By condition of burner feed or feed means
431 89, 431 12, 239414, 2394165, 239417, F23N 102
Patent
active
050889168
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a gas-air ratio control valve which is used in a gas burner and adapted to properly control the feeding ratio of a primary air, a secondary air and a raw gas to the gas burner and which is chiefly used in a gas-type hot water supply system.
BACKGROUND ART
In a gas burner, it is necessary to secure a most appropriate proportion between a raw gas flow rate and an air flow rate in order to obtain a complete combustion.
To this end, heretofore, a primary air and a secondary air which were to be fed to a gas burner were controlled by properly varying the number of rotation of a centrifual blower or reducing the aperture of an air intake port of an air blower by means of an electronic control circuit or the like, and the raw gas which was to be fed to the gas burner was regulated in flow rate by increasing or decreasing the degree of the opening degree of a gas delivery valve.
However, according to such control means as mentioned, although there was no problem when the gas burner was at high load combustion, if a pressure change (an external factor, a rush of wind, etc.) should occur at the exhaust port side of the gas burner when the gas burner was at low load combustion, it had the shortcomings in that the flame of the gas burner was blown out, that carbon monoxide was generated, or that a back phenomenon of a flame was taken place and as a result, that a proper combustion was difficult to obtain.
Furthermore, the conventional control method had the shortcoming in that since the ratio of a secondary air with respect to a primary air was impossible to control, the generation of a combustion noise was difficult to restrain.
It is therefore an object of the present invention to provide a gas-air ratio control valve for gas burners, in which such shortcomings as inherent in the prior art as mentioned can be overcome, the flame of a gas burner is not blown out even if a pressure change (an external factor, a rush of wind etc.) is taken at an exhaust port side of the gas burner, a carbon monoxide is not generated, the back phenomenon of a flame can be prevented from being taken place, and as a result, a proper combustion can be obtained.
DISCLOSURE OF THE INVENTION
The present invention comprises a burner portion and a control portion for controlling a raw gas flow rate, a primary air flow rate and a secondary air flow rate;
said control portion being provided with a primary air chamber, a secondary air chamber and a raw gas chamber, said primary air chamber, secondary air chamber and raw gas chamber being communicated with said burner portion;
said control portion being provided with an operating rod which is able to move forward and backward, said control portion being also provided with a raw gas flow rate control valve portion, a primary air flow rate control valve portion and a secondary air flow rate control valve portion which are opened and closed according to the forward and backward movement of the operating rod;
said various valves being operated according to the forward and backward movement of said operating rod by means of a suitable actuator, so that the primary air flow rate flowed into said primary air chamber, the secondary air flow rate flowed into said secondary air chamber and the raw gas flow rate flowed into said raw gas chamber are controlled. By virtue of the foregoing arrangement, if the operating rod is moved forward and backward by the actuator, the raw gas flow rate control valve portion, the primary air flow rate control valve portion and the secondary air flow rate control portion can be interlocked without varying the pressure of the air-fuel mixture (a mixture of the primary air and the raw gas) which is to be fed to the gas burner.
In this invention, at the time when the raw gas flow rate control valve portion and the air flow rate control valve portion are to be constructed, if an annular valve seat which is secured to the valve box and a valve body which is secured to the operating rod, are concentrically arranged and if either an i
REFERENCES:
patent: 1917897 (1931-08-01), Morse
patent: 2290785 (1942-07-01), Turpin
patent: 2572675 (1951-10-01), Swenson et al.
patent: 3371699 (1968-03-01), Riot
patent: 4447010 (1984-05-01), Maeda et al.
Furuhashi Toshio
Hasegawa Mokoto
EIKEN Kougyo Kabushiki Kaisha
Price Carl D.
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