JPS6311449Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to an improvement of a gun-type burner in a liquid fuel combustion device.

That is, liquid fuel such as petroleum is pressurized and blown out in the form of a mist from a spray nozzle, and combustion air is forcibly fed in and mixed, ignited by discharge from a spark plug, and a burner installed opposite the spray nozzle is used. This is an improved structure of the gun-type burner, which forms a combustion flame with the flame holder at its base.

<Prior Art> The main parts of a conventional gun-type burner are shown in a simplified sectional view in FIG.

A frame holder 4' is installed near the opening 2'' in the blower tube 2' of the burner, and an ignition plug 6' is provided at the rear of the frame holder 4', located forward of the tip of the spray nozzle 3'.

The frame holder 4' is fixed in the blower cylinder at a peripheral wall ₄₃ ' bent forward, and has a through hole 4 in the center.
₁ ' is drilled, a large number of mold cuts are made radially from the through hole to the periphery, and a cut and raised piece 4 ₂ ' having a cross-section of The size of the through hole 4 ₁ ′ of the frame holder, the cut and raised piece 4 ₂ ′,
The dimensions, shape, etc. of the cut and raised holes are configured to correspond to the predetermined spray amount of the gun nozzle.

Therefore, when fuel is combusted by a burner equipped with a flame holder that corresponds to a gun nozzle with a specified spray amount, a stable combustion flame is formed by combustion with the specified spray amount, but if the combustion amount is variable beyond the specified amount. It was not possible to do so, and various troubles occurred.

For example, in a burner consisting of a combination of a spray nozzle with a capacity of 30,000 kcal/h and a corresponding frame holder, only the spray nozzle is
If you replace it with one with a capacity of 10,000kcal/h and burn it, the spray amount and combustion air supply conditions will deteriorate.
A combustion flame with its root in the flame holder is not formed and causes a lifting phenomenon or blows out, which is dangerous and does not result in complete combustion.
Accompanied by generation of CO and odor. Also, conversely, 10000kcal/h
30000kcal/h of spray nozzle with burner by combination of spray nozzle and frame holder compatible with
If the flame holder is replaced with one with a capacity of It was necessary to solve the problem of eliminating the drawbacks of

<Purpose> On the other hand, we are now in an era in which a single oil water heater can supply the amount of hot water needed for a group of households by burning liquid fuels that have a large calorific value and high thermal efficiency, and it is possible to increase or decrease the amount of hot water supplied. There is an increasing demand for water heaters that can maintain a constant water temperature regardless of increases or decreases in the amount of hot water.

In order to realize this desire, a burner that can form a stable combustion flame regardless of increases or decreases in the amount of combustion is required. SUMMARY OF THE INVENTION The object of the present invention is to provide a gun-type nozzle which eliminates the above-mentioned drawbacks of the prior art, has a simple structure, and is capable of expanding the combustion range in order to meet current demands.

<Example> An example of the present invention is shown in FIG. 2 and below, and will be described in detail.

In Fig. 2, 1 is a blower, 2 is a blower tube, 3 is a spray nozzle, 4 is a frame holder, 5 is a retainer, 6 is a spark plug, and the frame holder 4
The periphery of the mounting board 7 is connected to the opening 2 of the blower tube.
It is fixed on the inner circumference closer to ₁ . The frame holder is connected to the central through hole 4 ₁ and has a cut-and-raised piece 4 ₂ having a square cross-section.
are arranged radially. The above configuration is the same as the conventional one, but a retainer 5, which is the main point of the present invention, is attached to the back side of the frame holder 4 at a predetermined gap L, and the retainer 5 is attached to the third
As shown in the exploded perspective view, the peripheral side wall 5' is curved,
The front end opening 5 ₁ has a large diameter, and the opening 5 ₂ at the center of the back has a small diameter. an opening 5 ₂ at the center of the back surface of the retainer;
There is a predetermined distance from the tip of the spray nozzle 3, and the tip of the spark plug 6 is positioned from the center opening ₅₂ of the retainer 5 to the periphery of the through hole ₄₁ of the frame holder 4.

In FIG. 2, the through hole 4 of the frame holder 4
The diameter d of ₁ is the central opening 5 on the back of the retainer 5. The diameter d of _{2 is 3.}
The diameter d ₃ of the central opening 5 ₂ is smaller than the diameter d ₂ of the outer circumference of each cut-and-raised piece of the frame holder,
The relationship is d ₁ <d ₃ <d ₂ , and there is the gap L between the frame holder and the retainer. In this way, the frame holder 4 and the retainer 5 are arranged in a constant relationship.

<Function> The gun-type burner of the present invention having the above configuration operates as follows. In the case of combustion with a small spray amount as shown in Fig. 4, the atomized fuel ejected from the tip of the nozzle is directed to the base side of each radial cut-and-raised piece ₄₂ of the frame holder 4, that is, the center transparent part, as shown in Fig. 4. Hole 4 ₁
The base of the combustion flame A ₁ is formed near the circumference of the flame A 1 and it burns. This is because the outer periphery of each cut and raised piece of the frame holder 4 is blocked by the back plate of the retainer 5 on the back side, so although there is a flow of air from the blower passing through the gap L, The flow velocity is slower than that in the center where it travels almost straight, and vortices are also formed, so the combustion flame in the center is not blown away, and it helps mix the atomized fuel and air in that part, allowing smooth combustion to continue. .

Next, as the amount of fuel spray is increased, the combustion becomes
The flame holder 4's cut-and-raised piece 4 ₂ cannot be completely burned only on the inner periphery base side, and the base of the combustion flame gradually expands from the gap L part to the outer periphery side, and the air supply amount increases, reaching the maximum When the amount of spray is reached and combustion occurs, a combustion flame _A2 is formed almost over the entire cut and raised portion as shown in FIG. 5, and stable combustion can be continued at the maximum amount of spray.

Other Embodiments; FIGS. 6 and 7 show other embodiments of the present invention. The retainer 5 of the embodiment shown in FIG. A number of air regulating holes 7 are formed in a portion near the outer periphery of the frame holder 4 to rectify the secondary air flow formed in the space formed between the outer periphery of the frame holder 4 and the inner periphery of the blower tube 2.

The retainer 5 shown in the embodiment of FIG.
Similar to the embodiment shown in the figure, in order to form the secondary air into a swirling flow and obtain better mixing of the atomized fuel and the combustion air, the large-diameter outer circumferential portion is bent outward and cut and bent at several places. It has a structure with cut and raised holes.

<Effects> The gun type burner of the present invention having the above-described configuration and operation has the following features in the frame holder 4 in the blast cylinder:
The frame holder has a simple planar donut-like structure, and the diameter d ₃ of the central opening 5 ₂ is larger than the central through hole 4 ₁ of the frame holder 4 and smaller than the diameter d ₂ of the outer circumference of the cut and raised part. By simply installing a gap L on the back side, a stable combustion flame can be formed by increasing the amount of spray from the nozzle 3, making it possible to form a stable combustion flame for large water heaters and proportional control combustion water heaters. This burner has a useful practical value as it can vary the combustion range of the sprayed fuel and form a stable combustion flame regardless of the increase or decrease in the amount of combustion.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the main part of the conventional gun-type burner, Fig. 2 is a longitudinal cross-sectional view of the main part of the gun-type burner of the present invention, Fig. 3 is an exploded perspective view of the same frame holder and retainer, and Fig. 4 5 is a longitudinal sectional view of the notch showing the combustion state with a large spray amount, and FIGS. 6 and 7 are cutaways showing other embodiments of the same. Main part longitudinal sectional view. 1...Blower, 2...Blower tube, 3...Nozzle,
4... Frame holder, 5... Retainer, L...
Gap, d ₁ , d ₂ , d ₃ ... diameter, A ₁ , A ₂ ... combustion flame.

Claims (1)

[Scope of utility model registration request] In a gun-type burner that mixes atomized fuel from a nozzle and combustion air from a blower to form a combustion flame on a flame holder provided in a blower tube corresponding to the tip of the nozzle, a center portion A through hole of a predetermined diameter is bored in the frame holder, and a plurality of cut and raised pieces are provided in a radial manner in one direction on the outer periphery of the through hole to form the cut and raised hole.
A retainer having a central opening larger in diameter than the through hole and smaller in diameter than the outer diameter of the cut and raised hole is fitted at the peripheral edge to maintain a predetermined gap L with the frame holder. Gun type burner.