JPH03117803A - Pulse burner of coupler - Google Patents

Abstract

PURPOSE:To eliminate a wasteful space and shorten the length in the axial direction and miniaturize the whole structure of a subject device by arranging an exhaust gas decoupler along a tail pipe and in the range of position from the upstream end of a combustion chamber to the down-stream end of a tail pipe. CONSTITUTION:In exhaust gas decoupler 22 is provided between the tail pipes 2 in a pair of pulse burners 3a and 3b that are arranged in parallel and in the range of position from the upstream end to the down-stream end of the tail pipe 2. The downstream end of each tail pipe 2 is connected to the exhaust gas decoupler 22 through a connecting pipe 23 so as to position the connections symmetrically with respect to the axial line of the exhaust gas decoupler. With this constitution the exhaust gas decoupler 22 is positioned in the space which has been considered wasterful in the conventional devices. It is possible, therefore, to shorten the length of the whole device along the axial direction of the tail pipe 2 and realize the miniaturization of the whole structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a connected pulse combustion device in which a pair of pulse burners formed in the same shape are connected in parallel.

(Prior Art) As is well known, pulse burners essentially have the ability to significantly increase the combustion load, achieve high thermal efficiency, and reduce harmful components in exhaust gas compared to general burners. It has many advantages such as.

A pulse burner usually consists of a combustion chamber, a tail pipe connected to the exhaust port of the combustion chamber and having a passage cross-sectional area smaller than that of the combustion chamber, a fuel supply/end passage for supplying fuel and air into the combustion chamber, and an air supply. a one-way valve which is inserted into the fuel supply passage and the air supply passage respectively and has a flow coefficient in the forward direction larger than that in the reverse direction; and an ignition system for igniting the mixed gas supplied into the combustion chamber. It consists of When the mixed gas in the combustion chamber is ignited, it combusts explosively. As a result, the pressure inside the combustion chamber increases, the one-way valve dynamically closes, and the combustion gas is exhausted at high speed from the exhaust port through the tail pipe. When this exhaust is performed, the pressure inside the combustion chamber becomes negative pressure. As a result, the air/fuel mixture flows into the combustion chamber again. When a certain amount of fuel flows in, it is ignited by the embers and explosive combustion occurs again.

Thereafter, the combustion described above is repeated. Therefore, the combustion mode in the pulse burner is intermittent explosive combustion. For this reason, pulse burners are noisy.

In order to solve such problems, a connected pulse combustion device in which a pair of pulse burners are connected in parallel has been considered. As shown in Fig. 6, this coupled pulse combustion device is equipped with a combustion chamber 1 and a tail pipe 2 with a small passage cross-sectional area that is coaxially connected to the exhaust port of the combustion chamber 1, and has the same size and shape. The pair of pulse burners 3a and 3b thus formed are arranged in parallel, and the downstream ends of the tail pipes 2 in these pulse burners 3a and 3b are respectively connected to the exhaust decoupler 4,
Further, the air inlet 5 of each combustion chamber 1 is connected to the air supply chamber 7 via a one-way valve (aerodynamic valve) 6, and the fuel inlet 8 of each combustion chamber 1 is connected via a one-way valve 9. It is connected to the fuel supply pipe 1o. In addition, in the figure, 11 indicates an air guide tube that guides air to the air chamber 7, 12 indicates an igniter operated at the time of ignition, and 13
indicates the exhaust gas pipe.

In this connected pulse combustion device, a pair of pulse burners 3
By interfering the pressure fluctuations of a and 3b in the common exhaust decoupler 4 and the air supply chamber 7, the process consisting of intake of mixed gas, explosive combustion, and exhaust in one pulse burner is mixed with the process in the other pulse burner. The phase of the stroke consisting of gas intake, explosive combustion, and exhaust is shifted by 180 degrees ζ6 to offset pressure fluctuations between the two, thereby reducing noise.

However, even with such a connected pulse combustion device, there are the following problems. That is, the explosion combustion stroke tU of the pair of pulse burners 3a and 3b is completely reduced to 180
In order to reduce the temperature difference ζ6, it is necessary to form the pair of pulse burners 3a, 3b in the same size and shape, and to connect these pulse burners 3a, 3b symmetrically to the exhaust decoupler 4 and the air supply chamber 7. be. In order to meet these conditions, in the conventional coupled pulse combustion apparatus, the pulse burners 3a and 3b are arranged in parallel as shown in FIG. It is symmetrically connected to the exhaust decoupler 4 arranged on the extension line. The exhaust decoupler 4 is usually formed to have a volume several times the volume of the combustion chamber 1.

In this way, in the conventional coupled pulse combustion device, the pair of pulse burners 3a and 3b are arranged in parallel, and the downstream end of the tail pipe 2 is connected to the exhaust decoupler 4, which has a large volume and is arranged on an extension of the tail pipe 2. Because the system is connected to the other end, the overall space utilization rate is low, and the distance from upstream side to upstream side is long based on the flow direction of the exhaust gas, which increases the size of the entire device. .

(Problems to be Solved by the Invention) As mentioned above, in the conventional coupled pulse combustion device,
There was a problem that the space utilization rate was low and the overall size tended to increase.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a coupled pulse combustion device that can eliminate the above-mentioned problems without affecting combustion characteristics.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, in the coupled pulse combustion device according to the present invention, the combustion chamber is connected along the tail pipe and from the upstream end of the combustion chamber to the downstream end of the tail pipe. An exhaust decoupler is placed in the position range up to

(Function) With the above configuration, the exhaust decoupler is located on the side of the tail pipe in the pair of pulse burners. The exhaust decoupler functions to reduce pressure amplitude, that is, noise, by canceling out pressure fluctuations within a pair of combustion chambers that perform pulse combustion in opposite phases.

This function is independent of the position of the exhaust decoupler as long as the pair of tailpipes are connected in a symmetrical relationship.

Therefore, by arranging the exhaust decoupler on the side of the tail pipe as described above, it is possible to increase the space utilization rate without affecting the combustion characteristics, and also to realize a reduction in the overall size.

(Example) Examples will be described below with reference to the drawings.

FIG. 1 shows a main part 21 of a coupled pulse combustion apparatus according to an embodiment of the present invention. In this figure, the same parts as in FIG. 6 are indicated by the same reference numerals. Therefore, detailed explanation of the overlapping parts will be omitted.

The coupled pulse combustion device according to this embodiment differs from conventional devices in the arrangement of the exhaust decoupler 22. That is, in this embodiment, the exhaust decoupler 22 is provided between the tail pipes 2 of the pair of pulse burners 3a and 3b arranged in parallel, and in a position range from the upstream end to the downstream end of the tail pipe 2. The downstream end of each tail pipe 2 is connected to the exhaust decoupler 22 via a connecting pipe 23 so as to be symmetrical about the axis of the exhaust decoupler 22.

With such a configuration, the exhaust decoupler 22 is located in a portion that has conventionally been considered a wasted space. Therefore, the space utilization rate can be increased compared to conventional devices, and the length of the entire device along the axial direction of the tail tube 2 can be shortened, resulting in the overall miniaturization. can.

FIG. 2 shows an example in which the configuration shown in FIG. 1 is modified.

In this example, the distance between the W rows of the pair of pulse burners 3a and 3b is narrower than the example shown in FIG.
The exhaust decoupler 22 is arranged so that the line connecting the two axes forms a triangle. Further, the air supply chamber 7 is also arranged so that a line connecting the axis of the air supply chamber 7 and the axes of the pair of combustion chambers 1 forms a triangle.

By arranging the pair of pulse burners 3a, 3b and the exhaust decoupler 22 in this manner, the entire apparatus can be made smaller than the case shown in FIG.

FIG. 3 shows the main part 21a of a coupled pulse combustion apparatus according to another embodiment of the present invention.

In this figure as well, the same parts as in FIG. 1 are indicated by the same reference numerals. Therefore, detailed explanation of the overlapping parts will be omitted.

In this embodiment, the exhaust decoupler 22a is formed to have approximately the same diameter as the air supply chamber 7, and the exhaust decoupler 22a
The end located on the air supply chamber 7 side is extended and coaxially connected to the air supply chamber 7, so that the wall 24 of the air supply chamber 7 also serves as a closing wall of the exhaust decoupler 22a. Further, an air guide pipe 25 is provided to axially penetrate inside the exhaust decoupler 22a, and this air guide pipe 25 is connected to the air supply chamber 7. Note that 26 in the figure indicates an exhaust gas pipe that is connected to a position close to the air supply chamber 7 and discharges gas from inside the exhaust decoupler 22a.

With such a configuration, not only can the same effects as in the embodiment described above be expected, but also the air guide tube 25 is disposed so as to pass through the inside of the exhaust decoupler 22a in the axial direction. Heat can be recovered by exchanging heat between the air flowing inside and the exhaust gas, improving thermal efficiency.

FIG. 4 shows an example in which the configuration shown in FIG. 3 is modified.

In this example, the pair of pulse burners 3a and 3b are
The row spacing is narrower than in the example shown in FIG. 3, and the lines connecting the axes of the pair of pulse burners 3a and 3b and the axes of the exhaust decoupler 22a (air supply chamber 7) form a triangle. A large exhaust tube 7-22a (air supply chamber 7) is arranged.

By arranging the pair of pulse burners 3a, 3b and the exhaust decoupler 22 (air supply chamber 7) in this manner, the entire apparatus can be made smaller than the case shown in FIG. 3.

FIG. 5 shows a main part 21b of a coupled pulse combustion apparatus according to yet another embodiment of the present invention. In this figure, the same parts as in FIG. 3 are designated by the same reference numerals. Therefore, detailed explanation of the overlapping parts will be omitted.

In this embodiment, a pair of pulse burners 3a.

3b, a structure in which an air supply chamber 7a and an exhaust decoupler 22b are coaxially connected is arranged within the range of the axial length of the pulse burner. One end of the cylindrical body 28 is connected to the peripheral edge of the partition wall 27 that partitions the air supply chiton bar 7a and the exhaust decoupler 22b, and the other end of the cylindrical body 28 is extended toward the exhaust decoupler 22b.
An annular passage 29 formed between the air supply chamber 8 and the peripheral wall of the air supply chamber 7a communicates with the air guide opening 30. Further, one end side of the exhaust gas pipe 31 formed to have a smaller diameter than the cylindrical body 28 is inserted into the exhaust decoupler 22b along the axis of the exhaust decoupler 22b, and its tip is fitted into the cylindrical body 28. ing. Furthermore, a drain hole 32 is provided in a portion of the peripheral wall of the cylindrical body 28 near the partition wall 27, and this drain hole 3
2 is communicated with the outside via piping 33. Note that 34 in the figure indicates a fan for promoting exhaust gas.

With such a configuration, not only the same effects as those of the above-described embodiments can be obtained, but also the condensed water in the exhaust gas can be treated in a more convenient manner. That is, each pulse burner 3a, 3b
The exhaust gas discharged from the exhaust gas is cooled by air using the cylindrical body 28 as a heat exchange wall while proceeding through the exhaust decoupler 22b and reaching the entrance of the exhaust gas pipe 31. Therefore, the moisture contained in the exhaust gas condenses. This condensed water is drained from the drain hole 32.
, and are discharged to the outside via piping 33. On the other hand, while the exhaust gas from which moisture has been removed travels through the exhaust gas pipe 31, it receives heat from the new exhaust gas that has flowed into the exhaust decoupler 22b, increases its temperature, and is discharged to the outside as a dry gas. Therefore, the treatment of condensed water, which is a problem in this type of combustion apparatus, can be facilitated.

Note that the present invention is not limited to the embodiments described above. That is, as a modification of the example shown in FIG. 5, a triangular arrangement as shown in FIG. 4 may be adopted. Also, the fifth
The fan in the figure is not necessarily required.

[Effects of the Invention] As described above, in the coupled pulse combustion device according to the present invention, the exhaust decoupler is arranged along the tail pipe and in a position range from the upstream end of the combustion chamber to the downstream end of the tail pipe. Therefore, wasted space can be eliminated, and the axial length can also be shortened, contributing to miniaturization of the entire device.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a coupled pulse combustion device according to an embodiment of the present invention, FIG. 2 is a perspective view of a main part of a coupled pulse combustion device according to another embodiment of the present invention, and FIG. 4 is a sectional view of a main part of a connected pulse combustion device according to yet another embodiment of the present invention, FIG. 4 is a perspective view of a main part of a connected pulse combustion device according to a different embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view of a main part of a connected pulse combustion apparatus according to still another embodiment of the invention, and FIG. 6 is a cross-sectional view of a main part of a conventional connected pulse combustion apparatus. 1... Combustion chamber, 2... Tail pipe, 3a, 3b... Pulse burner, 7.7 a... Air supply chamber, 6.9...
・One-way valve, 10...Fuel supply pipe, 11.25...
Air guide pipe, 12...Igniter, 13, 26.31
...exhaust gas pipe, 21.21a, 21b...main part,
22.22a. 22b...Exhaust decoupler.

Claims (3)

[Claims] (1) A pair of pulse burners that are provided with a combustion chamber and a tail pipe whose one end side communicates with the exhaust port of the combustion chamber, and which are formed in the same size and shape, and the downstream ends of the tail pipes of these pulse burners are commonly connected. In the coupled pulse combustion apparatus, the exhaust decoupler includes an exhaust decoupler along the tail pipe and a means for supplying air and fuel to the combustion chamber of each of the pulse burners. A coupled pulse combustion device, characterized in that it is arranged in a position range from the upstream end of the chamber to the downstream end of the tail pipe. (2) The exhaust decoupler is arranged in a relationship such that a line connecting the axis of the exhaust decoupler and the axis of each of the pair of pulse burners forms a triangle. The coupled pulse combustion device described in . (3) Claim 1, wherein the air supply means supplies air guided to the combustion chamber via an air guide path provided through the exhaust decoupler.
Or the connected pulse combustion device according to 2.