JPS5810642B2 - gas burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a combustion plate 2 having a forward wave pattern disposed in front of a burner tube body 1, and a plurality of combustion plates for blowing out air from a blower 3 connected to the rear end of the burner tube body 1. An air supply port 4 is formed in the peripheral wall of the combustion plate 2, and a gas injection port 5 is formed in the rear plate 2a of the combustion plate 2.
A Venturi tube 6 is led out rearward from a, a gas nozzle 7 is introduced into the rear end of the Venturi tube 6, a small air inflow hole 9 is bored in the nozzle plate 8 at the rear end of the Venturi, and the air supplied from the blower 3 is This gas burner is characterized in that it can be introduced into a pentule tube 6 through a small air inflow hole 9, and its purpose is to increase the throttling rate of the gas supply amount from the gas nozzle. The purpose of the present invention is to provide a svarna that can increase the variable range of maximum and minimum heat generation.

Generally speaking, in a gas burner that injects and directly burns so-called raw gas without mixing primary air, the raw gas is supplied to the combustion space A inside the combustion plate 2 from the nozzle part 11 of the raw gas supply pipe 10, as shown in FIG. The air supplied from the blower is supplied from the air supply port 4 of the combustion plate 2 to be combusted in the combustion space A, and the amount of raw gas ejected is throttled by keeping the air supplied from the blower constant. This controlled the amount of heat of combustion.

However, in the above-mentioned device, if the ejection amount of raw gas is extremely restricted, there is a risk that the ejection pressure is small and the air from the air supply port 4 is not sufficient enough to burn at a position, resulting in incomplete combustion. It was not possible to increase the throttle ratio for the amount of raw gas ejected, and it was only possible to change the amount of heat generated by combustion within a large range.

The present invention has been made in view of the above points, and the present invention will be explained in detail below with reference to Examples.

A combustion plate 2 with a front wave is disposed at the front of a burner tube main body 1 having a rectangular cross section, and a combustion space A having an inverted trapezoidal cross section is formed inside the combustion plate 2.

A plurality of air supply ports 4 are perforated in a staggered manner on the peripheral wall of the combustion plate 2 to blow air supplied from a blower 3 connected to the rear end of the burner tube body 1 into the combustion space A. The diameter of the opening 4 is increased from the rear to the front.

A plurality of gas jet ports 5 are provided on the rear plate 2a of the combustion plate 2.
A flame holding plate 15 is provided extending forward from the rear plate 2a to prevent flames from scattering.

Venturi tubes 6 (two in this embodiment) are led out from the rear plate 2a, and the rear end of the venturi tubes 6 is fixed to a mounting plate 12 having a large number of air circulation holes.

A gas nozzle 7 that communicates with a gas supply pipe 13 is introduced into the rear end of the Venturi tube 6, and the gas nozzle 7 is held by a nozzle plate 8.

The injection port area of the gas nozzle 7 is set to be smaller than the total area of the gas ejection ports 5 of the rear plate 2a.

Furthermore, the nozzle plate 8 is provided with an appropriate number of air inflow holes 9 for supplying air into the venturi tube 6, and a substantially constant amount of air is always fed into the venturi tube 6 from these air inflow holes 9. It is intended to be supplied.

Now, when a certain amount of fresh air is supplied from the blower 3 to the burner tube body 1 and raw gas is supplied from the gas nozzle 7, air from the small air inflow hole 9 is mixed with the raw gas due to the Venturi effect. The mixed gas is injected from the gas jet port 5, and the air and gas supplied from the air supply port 4 are mixed in a vortex flow in the combustion space A, and are combusted so as to inject flames forward.

In this case, if you set the raw gas supply amount to the maximum (the amount that burns the raw gas to the maximum with the amount of air that can be supplied from the blower 3), not only will the maximum amount of heat be generated and complete combustion will be achieved, but you will also be able to reduce the raw gas supply amount to a small value. Even if the air from the air supply port 4 is not sufficiently supplied to the gas supplied from the gas jet port 5, the gas is completely combusted by the air flowing from the small air inflow hole 9 due to the Venturi effect.

Therefore, it is possible to increase the squeezing ratio of the raw gas, and it is possible to widen the variable range of the maximum amount of heat generated and the minimum amount of heat generated.

As a practical matter, the device shown in FIG. 3 could only achieve an aperture ratio of 1:20, but the device of the present invention can achieve an aperture ratio of up to 1:40.

A gas burner constructed as described above is one in which the burner tube main body 1 is located inside the heating duct 16 and the air supply tube to the blower 3 is exposed outside the heating duct 16, as shown in FIG. 2, for example. The air heated by the gas burner is forcedly circulated and supplied by the circulation fan 14, and can be used for indoor heating, heating of heating furnaces, drying furnaces, and other objects to be heated.

As described above, the present invention includes a combustion plate with a forward wave in front of the burner tube body, and a large number of air supply ports for blowing out air from a blower connected to the rear end of the burner tube body. Since the peripheral wall is perforated, the raw gas and air are vortex mixed in the combustion space inside the combustion plate, resulting in smooth combustion. A Venturi tube is guided backward from the face plate, a gas nozzle is introduced into the rear end of the Venturi tube, a small hole for air inflow is bored in the nozzle plate at the rear end of the Venturi tube, and the air supplied from the blower is passed through the small air inflow hole. Since the air can be introduced into the Venturi tube through the hole, air can always be supplied into the Venturi tube from the air inflow 1J4L by the Venturi effect, and the amount of raw gas supplied can be reduced and the air can be introduced from the air supply port of the combustion plate. Even if the gas supply pressure reaches such a level that combustion occurs at a location where the air is not sufficient, complete combustion will occur with the air flowing in through the small air inlet holes, and it is possible to achieve smooth combustion in the combustion space described above. Coupled with this effect, it is possible to increase the squeezing rate of the raw gas, and the variable range of the maximum and minimum heat generation can be widened, and what's more, all that is needed is a Venturi tube with a small hole for air inflow. Since the difference between the maximum amount of heat generated and the minimum amount of heat generated can be made large, the structure is often simple and can be manufactured at low cost, and there is no need for a complicated control mechanism and there are very few failures.

Furthermore, in the present invention, even when combustion is performed outside the range close to the minimum amount of heat generated, air is mixed in the venturi tube and air is mixed in the combustion space of the combustion plate in stages, so that gas and air are mixed. The mixture is completely mixed, which stabilizes the combustion flame, and suppresses the generation of aldehydes and nitrogen oxides, which can reduce harmful effects on the eyes and the generation of bad odors.Furthermore, by changing the amount of gas supplied to change the amount of heat generated, the Venturi effect The negative pressure applied to the small air inflow hole changes, and the amount of air mixed in the Venturi tube changes proportionally depending on the gas supply amount, making the combustion flame even more stable and generating aldehydes and nitrogen oxides. can be suppressed.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1a is a partially omitted front sectional view showing an embodiment of the present invention;
Figure 1 is a side sectional view of the same as above, Figure 1C is a top view of the same as above,
Fig. 2 is a partially cutaway, reduced perspective view showing an example of use of the same as above, and Fig. 3 is an explanatory sectional view showing a conventional example, in which 1 is a burner tube body, 2 is a combustion plate, 2a is a rear plate,
3 is a blower, 4 is an air supply port, 5 is a gas injection port, 6 is a venturi tube, 7 is a gas nozzle, 8 is a nozzle plate,
9 is a small hole for air inflow.

Claims (1)

[Claims] 1. A combustion plate with a forward wave is disposed in front of the burner tube body, and a plurality of air supply ports for blowing out air from a blower connected to the rear end of the burner tube body are bored in the peripheral wall of the combustion plate, A gas injection port is drilled in the rear plate of the combustion plate, a venturi tube is led out from the rear plate, a gas nozzle is introduced into the rear end of the venturi tube, and a small hole for air inflow is formed in the nozzle plate at the rear end of the venturi tube. A gas burner characterized in that the air supplied from the blower can be introduced into the Venturi tube through the small air inlet holes.