JPS60149813A - Tip mixing type blast burner - Google Patents

Abstract

PURPOSE:To prevent generation of superheat on a fuel gas dispersion pipe, by providing the fuel gas dispersion pipe in a state bringing the pipe into contact with a burner body case constituting a combustion air supply path. CONSTITUTION:A burner body case 5 is constituted by making press processing of a metal plate so that a plurality of rows of straight-pipelike combustion air supply paths 3 and a plurality of rows of cooling air spouting grooves 4 whose cross sections make almost a triangle or a trapezoid are formed on the upper part of a bottom air chamber 1 making a lengthy square shape (rectangular parallellepiped) with a partition wall 2 between the supply path 3... and the spouting groove 4.... Then straight-pipelike and a tip-blockaded fuel gas dispersion pipes 6... are arranged respectively in hollow part between combustion air supply paths 3, 3 of the combustion air supply paths 3... adjoining with each other in a state that almost a lower half circumference of the dispersion pipe is brought into contact with a burner body case 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention was made by Patent Application No. J1 + 207 Co/λ and Utility Application No. Sho J1-/7J Ri JO (both filed on July 2, 1978) by the applicant of the present application. The present invention relates to an improvement of a pre-mixing type Plastburner that can be suitably used mainly for domestic water heaters, etc., as already proposed by .

Conventionally, Bunsen type or semi-Bunsen type burners have been used for household use, but these types have difficulty in high-load combustion (even forced ventilation type burners have a maximum
. The burner has the disadvantage of being too large for use in equipment that requires high output and fine combustion control, such as boilers for heating systems.

Therefore, it is conceivable to apply an industrial Plastburner that is capable of high-load combustion and a large turndown ratio to household combustor equipment, but in that case, such an industrial burner would have a round shape. Because most of the parts are square, it is unsuitable for household use, which requires a rectangular shape in terms of installation space. Furthermore, most of the types use burner tiles, which are heavy and expensive. There are some drawbacks mentioned earlier.

Therefore, in view of this point, the Kigumi applicant.

A pre-mixed plastoburner that has a compact configuration, can perform high-load combustion, has excellent power and turndown ratios, and is lightweight and easy to configure into a rectangular shape has been developed in the patent application filed in the earlier application of the present application. Gas dispersion pipe (5) and combustion air supply path (3) on both sides thereof.

(In addition, the two air common supply passages +a'+,
There are holes (
5a)... and both the air supply paths L3'l
, (The gas dispersion tubes (5'
) is formed with holes (8a') for ejecting combustion air opposite or almost opposite to the gas fractional ejection holes (5a) of the fuel gas. By colliding the combustion air and the combustion air head-on or almost head-on, it is possible to mix the two extremely well. Therefore, low-pressure gas such as city gas can be used as is as the fuel gas, and the supply pressure of the combustion air can be reduced. Even if the combustion rate is kept low, it is possible to carry out combustion at a considerably higher load compared to conventional combustion methods.Furthermore, by using the pre-mixing method, the turndown ratio can be set to be extremely large, and the fuel gas dispersion is improved. Pipe (5) and combustion air supply path +: +'+
, +3') are both straight tube-shaped.

The overall shape of the burner can be easily configured into a rectangular and compact one, and furthermore, by making at least the combustion air supply path made of pressed sheet metal, it is possible to easily reduce the weight of the entire burner. can. It has become a product that offers various basic advantages such as:

However, even in such an excellent pre-mixing type Plastburner, there remains a drawback that the fuel/gas distribution tube (51) is easily overheated during combustion.

The present invention has been made in view of the above points, and its purpose is to further improve the pre-mixed plastic burner, which has the excellent basic advantages as described above, so as to improve the fuel efficiency as described above. The purpose is to ensure that overheating of the gas distribution tube does not occur.

EMBODIMENT OF THE INVENTION Below, first, an embodiment of the pre-mixing type plastic burner according to the present invention will be described.

As shown in Fig. 8 and Fig. 4, a partition wall (2) is installed on the top of the bottom air chamber (〇) which has a long rectangular shape (rectangular parallelepiped shape).
A plurality of rows of straight pipe-shaped combustion air supply passages (3) and a plurality of rows of cooling air ejection grooves (4) each having a substantially triangular or trapezoidal cross section are formed across the The burner body case (5
) and the combustion air supply @ (3).
・Fuel gas dispersion pipes (6) with a straight pipe shape and a closed end are installed in the four parts adjacent to each other (3) and f3+, respectively.
- is disposed such that about its lower half circumferential surface is in contact with the burner main body case (5). In addition, a pipe (7) for introducing combustion air under pressure is connected to the bottom air chamber. Also, a pipe (7) for introducing combustion air under pressure is connected to the bottom air chamber. gas introduction nozzle (
Although not shown in the first figure, 6A) is connected to a single fuel gas supply pipe at its base end side.

The partition wall (2) includes a number of communication holes (2a) for supplying combustion air fractionally from the bottom air chamber fl) into each air supply path (3), and the cooling air. A large number of communication holes (2b) for supplying cooling air into the ejection grooves (4) are formed in a row.

Note that this partition wall (2) has a good distribution of combustion air.
In addition, on both sides of each of the fuel gas distribution pipes (6), there are combustion air supply passages +31, F31 in the horizontal or substantially horizontal direction, that is, on both sides thereof. towards the side of the.

Numerous small holes (6a) for distributing and ejecting fuel gas.
・A film is formed in rows.

Then, on one side or both sides of each of the combustion air supply passages (3), the combustion air is placed almost opposite to the gas dispersion nozzle (6a) of the gas branch pipe (6) described in [iii]. Relatively large combustion air nozzle (8a) for ejecting
... are formed in multiple rows, so that the fuel gas dispersed and ejected from the gas distribution pipe (6) and the combustion air ejected and supplied from the combustion air supply path (3)... By colliding head-on with the air, the two can be mixed extremely well. In addition, the gas dispersion nozzle (6a)... and the combustion air nozzle (8a)...
・ and may be arranged so as to face each other in a staggered manner. It is a spark igniter.

According to the above #i-formed pre-mixed plastoburner.

By colliding fuel gas and combustion air head on.

Because both can be mixed extremely well, even if a low-pressure gas such as city gas (approximately 100 nyn water column or less) is used as the fuel gas, and the supply pressure of combustion air is kept low (approximately JOmm water column), it will still be effective. High load combustion (10
, θ00, 000 kcal 7m" 111 or more), and since it is a pre-mixing type, the turndown ratio can be very large (approximately '/lo). Also, the fuel gas dispersion pipe fi+--,
Burner body case (in which combustion air flows)
Since the burner body case (5) is in contact with the burner body case (5), the heat is dissipated very well, and there is no problem of overheating of the burner body as the burner burns. has h throughout its interior.
In addition, the cooling air jet grooves (4) are formed near the gas dispersion pipe 1B), which serves as the combustion air, so that the heat dissipation is improved. It's very good, and it also doesn't overheat.

Make the fuel gas dispersion tube (6) thicker.

Since the upper end thereof and the upper end of the burner main body case (5) are arranged to be approximately at the same height, the flame transfer between the gas dispersion pipes (6) is performed well.

One igniter (8) is sufficient.

FIG. 5 shows another embodiment, in which not only the burner body case (5) constituting the air chamber (1) and the combustion air supply path (3), but also the fuel gas distribution pipe (6),
・The burner is also made of sheet metal, and the entire burner is made into a rectangular shape made of sheet metal by press processing, which not only makes manufacturing extremely easy, but also allows the entire burner to be extremely lightweight and compact. In particular, it can be suitably used for household combustion appliances that are desired to be square and lightweight.

In summary, in the pre-mixing type Plastburner according to the present invention, the fuel gas distribution pipe is arranged in such a manner that it is sandwiched between the combustion air supply passages on both sides thereof, and both the air supply passages are provided on both sides of the gas distribution pipe. holes for distributing and ejecting fuel gas toward the side surfaces of the gas dispersion tube, and holes facing the gas dispersion ejection holes of the gas dispersion tube are formed on the sides of both the air supply passages, respectively.
? ! It is placed in a pre-mixing type Plastburner, which has opposing holes that blow out combustion air.

The fuel gas distribution pipe is disposed in contact with a burner main body case that constitutes the combustion air supply path. and h
It has the following characteristics.

The above features! The functions and effects exhibited by the composition are as follows.

That is, as described in detail in the description of the embodiments.

Since the fuel gas and the combustion air are configured to collide head-on, the two can be mixed extremely well, and low-pressure gas such as city gas can be used as is as the fuel gas.

Even if the supply pressure of combustion air is kept low, it is possible to perform combustion with a considerably higher load compared to conventional methods.
Not only does the pre-mixing method provide excellent basic effects such as a very tight turndown ratio, but the fuel gas distribution pipe is brought into contact with the burner body case within which combustion air flows. Although this very simple structural improvement was made, it was possible to make the fuel gas dispersion tube perform well enough to prevent overheating.
It was possible to effectively prevent this, thereby making it highly durable.

[Brief explanation of the drawing]

Figures 1 and 2 are for explaining a pre-mixed plastic burner according to the prior art, in which Figure 1 is an overall perspective view and Figure 2 is a sectional view taken along the line ■-■ of Figure i@1. It is. FIG. 8 to FIG. 5 show an embodiment of the pre-mixing type plastic burner according to the present invention, and FIG. 8 is an overall perspective view,
4 is a sectional view taken along the line ff-IT in FIG. 3, and FIG. 5 is a sectional view of another embodiment. (3)...Combustion air (#M! path. (8a)...Air jet hole, (51...Burner body case, (6)...・Fuel gas distribution pipe,
(6a)...Gas outlet. Agent Patent Attorney Osamu Kitamura

Claims (1)

[Scope of Claims] ■ The fuel gas distribution pipe (6) is disposed in such a manner that it is sandwiched between the combustion air supply passages i3) and (al) on both sides of the fuel gas distribution pipe (6). Both air supply paths +
31, +31 are formed with holes (6a) for ejecting the fuel gas in a distributed manner toward the side surfaces of the air supply passages +31, +31, and the gas dispersion pipes (6) are formed on the sides of both the air supply passages +31, +3), respectively. In a pre-mixing plastburner, the fuel gas dispersion pipe (6) is formed with holes (8a) for ejecting combustion air opposite or almost opposite to the gas dispersion nozzle (6a) of the fuel gas dispersion pipe (6). The combustion air supply path ta), +
A pre-mixing type plastic burner characterized in that it is arranged in such a way as to be in contact with a burner body case (6) constituting a burner main body case (6). (2) The pre-mixed plasto burner according to claim 0, characterized in that the burner body case (6) constituting the combustion air supply passages 1al, +31 is made of sheet metal. ■ Burner body case (5) that constitutes the fuel gas distribution pipe (6) and the combustion air supply path +31, 131;
) are both made of sheet metal. (2) The fuel gas distribution pipe (6) and the combustion air supply paths fil, fi+ are both straight pipe-shaped, so that the overall shape of the burner is formed into a square shape. The premixed plastoburner according to any one of items 1 to 0.