JPH0116911Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a gas combustor, which is the core of a heater, etc., and burns an air-fuel mixture on the surface of a flame port made of a heat-resistant wire mesh.

This type of gas combustor described above introduces a mixture of gas fuel and combustion air to a cylindrical or hemispherical flame port formed of a heat-resistant wire mesh, and burns it on the surface of the flame port. The heat dissipated by infrared radiation from the flame port lowers the flame temperature, which reduces the production of nitrogen oxides (Nox), which are considered harmful during combustion. However, when the amount of combustion per unit area of the wire mesh that makes up the flame port decreases, the flame cools down to an extreme degree, and the combustion of the air-fuel mixture becomes incomplete, resulting in unburned gas (HC) and carbon monoxide. The problem is that the combustion exhaust gas contains a large amount of (CO) and other substances.
Furthermore, even if the amount of combustion becomes too large, the temperature of the air-fuel mixture rises too much, leading to flashback and thermal deterioration of the flame nozzle. In other words, this type of gas combustor is
Since the range of stable combustion is narrow, the range for adjusting the amount of combustion is very narrow.

The object of the present invention is to provide a gas combustor that has a wide range of combustion amount adjustment range and is easy to assemble into a heater or the like.

Next, the configuration of the present invention will be specifically explained based on an embodiment shown in the drawings.

The gas heater as an application example of the present invention shown in the drawings is constructed with a dual-type combustor 3 in which a main burner 1 and an auxiliary burner 2 are combined as a core, and heat generated by combustion in the combustor 3 is transferred to a built-in convection blower 4. It is used to heat the room by transporting it into the room along with the combustion exhaust gas. Compound combustor 3, which can be said to be the main part of a heater
The main burner 1 has an air-fuel mixture forming section 5A that forms a mixture of gas fuel and combustion air, and a combustion port 6A made of a cylindrical heat-resistant wire mesh connected to the combustion port 6A. In space S, main burner 1
A hemispherical flame port 6B made of a heat-resistant wire mesh is provided, which is connected to a separate air-fuel mixture forming section 5B.
An outer cylinder 7 made of heat-resistant metal is provided outside the flame port 6A of the main burner 1 and forms a space around the outer periphery of the main burner 1 as a mixture passage. This outer cylinder 7 forms a mixture forming part 5A and communicates with a suction pipe 8 that projects laterally at its upper end. outer cylinder 7;
The flame port 6A of the main burner 1 is open downward, and the sub burner 2 is located at the upper end of the flame port 6A of the main burner 1.
The flame outlet 6B is arranged in a downward convex spherical shape. This flame port 6B of sub-burner 2
is in communication with a mixture forming part 5B in which components other than the suction pipe 9 are contained within the mixture forming part 5A of the main burner 1. Each suction pipe 8, 9 of main burner 1 and sub-burner 2
are protruded in close rows, and one fuel nozzle 11, which is a terminal part of the fuel supply system 10, faces each open end. Secondary burner 2
In this way, the entire suction pipe 9 except for a part is housed within the outer cylinder 7. The suction pipe 9 of the auxiliary burner 2 penetrates the outer cylinder 7 through a through hole formed in the side surface of the outer cylinder 7, and is arranged so that its suction side faces the outside of the outer cylinder 7. However, this combustor 3 has a somewhat complicated shape with suction pipes 8 and 9 protruding laterally in parallel from the upper end and upper side surface of the outer cylinder 7, and if left as is, it would be difficult to incorporate it into a heater casing or the like. In this case, it is difficult to measure the correspondence between the two suction pipes 8 and 9 and the suction pipe outlet on the heater casing side. Therefore, in this example, the suction pipe 9 of the sub-burner 2 is divided into two parts, a mixture forming part side 9A and a suction end side 9B, which are fitted and connected within the outer cylinder 7. The mixture forming part side 9A and the suction end side 9B are the mixture forming part side 9.
A to the suction end side 9B, and the outer cylinder 7 from the through hole of the outer cylinder 7.
The connection is made by inserting the connection port into the suction end side 9B and pushing the connection port on the suction end side 9B into the connection port on the mixture forming portion side 9A. Therefore, it is possible to incorporate the combustor 3 into a heater casing or the like with the single suction pipe 8 protruding, and the suction pipe 9 of the auxiliary burner 2
can be connected and configured after the entire installation. Since the connection point of the suction pipe 9 of the sub-burner 2 is inside the outer cylinder 7, there is no functional problem as long as the gap between the through hole of the outer cylinder 7 and the suction pipe 9 is kept airtight. Note that the reference numeral 12 in the figure indicates the outer cylinder 7.
13 is an ignition electrode, and 14 is a gas sensor such as a SnO ₂ element that detects combustible gases such as CO and H ₂ in the combustion exhaust gas. .

That is, in the gas heater of this example, after gas fuel is supplied to the sub-burner 2 with a large input to ignite it, gas fuel is supplied to the main burner 1 to cause the main burner 1 to perform combustion operation, and the main burner 1 After the auxiliary burner 2 and the auxiliary burner 2 enter a simultaneous combustion state, a small input of gas fuel to the auxiliary burner 2 can be made to prevent the flame port 6A of the main burner 1 from exceeding the allowable temperature limit. Then, the amount of combustion in simultaneous combustion of the main and sub burners, and the amount of combustion of the sub burner 2
The individual combustion amount can be selected according to the load, increasing the range of combustion amount adjustment. In particular, in this example, the suction pipe 9 of the auxiliary burner 2 can be constructed by retrofitting, so even if the structure is complicated, it is easy to assemble into a heater or the like. The combustion amount can be adjusted by turning the main burner 1 on and off, by providing a bypass or a continuously variable valve in the main burner supply system, or by a combination of these. You can also do that.

As is clear from the above description of the embodiments, the gas combustor of the present invention is a dual-type combustor in which main and sub burners are combined, and the flame opening is made of heat-resistant wire mesh.
Since gas fuel can be supplied individually to each suction pipe of the main and auxiliary burners, the overall combustion amount can be adjusted over a wide range by combining the combustion amounts of the main and auxiliary burners. Become something. The suction pipe for the sub-burner has a split structure and is fitted and connected within the outer cylinder that forms the air-fuel mixture forming part of the main burner. It has the advantage of being easy to assemble even if the structure is complex because it can be configured after installation.

[Brief explanation of the drawing]

The drawing is a structural diagram showing the configuration of a gas heater as an application example of the present invention. 1...Main burner, 2...Sub-burner, 3...Combustor, 4...Convection blower, 5A, 5B...Mixture formation part, 6A, 6B... Flame port, 7...Outer cylinder, 8 ，
9...Suction pipe, 9A...Mixture formation section side, 9B...
...Suction end side, 11...Fuel nozzle, S...Combustion space.

Claims (1)

[Scope of utility model registration request] A suction pipe that receives gas fuel injection from a fuel nozzle and sucks combustion air together with the gas fuel, and a mixture forming device that connects to this suction pipe to form a mixture of gas fuel and combustion air and guide it to the combustion section. The burner consists of a main burner and a sub-burner, each having its own flame port made of a heat-resistant wire mesh for introducing the air-fuel mixture from the air-fuel mixture forming area and combusting it. Almost the entirety of the main burner's flame port and the sub-burner's suction pipe except for the suction side is housed in a cylindrical outer cylinder made of heat-resistant metal with an open bottom end, and the sub-burner's suction pipe is A gas combustor characterized in that it is divided into an air-fuel mixture forming part side and a suction end side, which are fitted and connected within the outer cylinder.