JPS61259015A - Burner having overheating-preventing device for flame holding cylinder - Google Patents

Abstract

PURPOSE:To provide always stable flame and prevent a burn-out of a flame- holding cylinder by a method wherein a duct is arranged to communicate from outside of a guide cylinder having a high static pressure with inside of the flame-holding cylinder and a sufficient amount of primary air can be supplied into the flame-holding cylinder through the duct. CONSTITUTION:A flowing speed of air at the rear part of a flame-holding cylinder 4 is increased by guide cylinders 6 and 6' and a proper amount of air can be supplied to the flame-holding cylinder 4. Each of a plurality of holes 4a and 4a formed in the flame-holding cylinder 4 and a plurality of air holes 6a, 6a and 6a', 6a' is connected to the ducts 7 and 7 and at the same time a specified space is formed between the large diameter ends of the guide cylinders 6 and 6' and the inner wall surface of the combustion cylinder 1. Therefore, even in the case that a flow speed of the secondary air is excessively increased, the injection of the primary air is not restricted and the flame can always be closely contacted to the flame-holding cylinder 4 and made stable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas burner, and particularly to an overheat prevention device for a flame stabilizing tube thereof.

[Conventional technology]

Unlike burners that use liquid fuel, gas burners do not require a fuel spray device or a vaporizer, and therefore have a relatively simple structure, and are therefore widely used in various fields.

A typical conventional gas burner is equipped with a manifold for discharging gas inside the combustion cylinder, and the gas sent from the gas supply path is sent to the gas ejection plate provided at the front opening of the manifold. It is ejected from the hole. A cone-shaped flame-holding tube is attached to the front of the manifold, and air that has passed through the combustion tube flows into the flame-holding tube through holes formed in the flame-holding tube. The structure is such that gas and air are mixed here and combustion occurs.

However, in the above-mentioned known gas burner, the area of the secondary air outlet formed by the combustion tube and the flame stabilizing tube is extremely small compared to the cross section of the combustion tube, and the secondary air outlet is unevenly distributed around the periphery. Next, the air outlet flow velocity is 10 m/sec
Even in the case of ~20 m/sec, the flow velocity of the airflow on the back side of the flame-holding tube is not high, so the flame-holding tube is not cooled by the airflow (there was a problem that the flame-holding tube would break).

In particular, the flame is more stable if it is brought into close contact with the flame-holding tube as much as possible, but if the flame is brought too close to the flame-holding tube, the flame-holding tube will burn, so there is no way to cool it down. required.

Therefore, between the combustion tube and the cone-shaped flame-stabilizing tube, the outer circumferential wall surface of the cone-shaped flame-stabilizing tube is covered with a desired spacing to increase the flow velocity of air on the outer circumferential surface of the flame-stabilizing tube. A guide tube is provided to prevent the flame-holding tube from overheating, increasing the flow velocity of air on the outer surface of the flame-holding tube, and thereby the flame-holding tube can be sufficiently cooled using secondary air. When the flow rate of air between the flame-holding tube and the guide tube is increased by this method, the static pressure decreases, and there is a problem in that the supply of primary air into the flame-holding tube becomes insufficient.

[Problem that the invention seeks to solve]

The present invention has been made based on the above-mentioned viewpoints, and its purpose is to increase the flow rate of air passing through the outer peripheral surface of the flame-stabilizing tube as much as possible, and to use secondary air to hold the flame-stabilizing tube. In addition to sufficient cooling, even if the flow velocity of the secondary air increases too much and the static pressure on the outer peripheral surface of the flame-stabilizing tube decreases, the ejection of primary air into the flame-stabilizing tube will not be suppressed, and the flame will not be suppressed. To provide a new gas burner in which the flame-stabilizing tube does not burn out even if the flame-stabilizing tube is brought into close contact with the wall surface of the flame-holding tube to always obtain a stable flame.

[Means for solving problems]
Therefore, the above object is to provide a gas burner having the guide tube with a duct that leads from the outside of the guide tube where the static pressure is high to the inside of the flame stabilizer tube, and to use this duct to control the inside of the flame stabilizer tube. This is achieved by configuring the system so that it can supply a sufficient amount of primary air.

[For production]

By configuring as described above, it is possible to increase the flow velocity of air passing through the outer circumferential surface of the flame stabilizing tube, and to sufficiently cool the flame stabilizing tube using secondary air. Even if the temperature rises too much, the blowout of the primary air is not suppressed, and the flame of the gas burner can be kept stable at all times by keeping the flame in close contact with the flame-holding cylinder.

〔Example〕

Hereinafter, the details of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an embodiment of a burner having a flame-holding tube overheat prevention device according to the present invention, and is a broken explanatory view showing the main parts thereof, FIG. 2 is a front view thereof, and FIG. It is an example, and is a broken explanatory view showing the main part.

In Figures 1 to 3, 1 is the combustion tube, 2 is the manifold, and 2 is the combustion tube.
2a and 2a are gas jet holes provided on the front surface of the manifold 2, 3 is a gas supply pipe, 4 is a cone-shaped flame-holding tube attached to the front of the manifold 2, and 4a and 4a are the flame-holding tubes 4. 5 is a pilot burner, 6 and 6' are between the combustion tube 1 and the cone-shaped flame stabilizing tube 4,
a guide tube 6a that covers the outer circumferential wall surface of the cone-shaped flame-stabilizing tube 4 while maintaining a desired interval, increases the flow of air on the outer circumferential surface of the flame-stabilizing tube 4, and prevents the flame-stabilizing tube 4 from overheating; 6a and 6a
', 6a' are air holes formed in plurality in the guide tubes 6 and 6', and 7.7 are holes 4a14 formed in the flame stabilizing tube 4.
A is a secondary air outlet connecting the air holes 6a, 6a and 6a', 6a' formed in the guide tubes 6 and 6'.

In the burner according to the present invention, as shown in FIG. A guide tube 6 is fixed to the inner wall surface of the combustion tube 1 and covers the outer circumferential wall surface of the cone-shaped flame stabilizing tube 4 at a constant interval, and a plurality of holes formed in the flame stabilizing tube 4 are provided. 4a, 4a and a plurality of air holes 6a, 6a formed in the guide tube 6.
and are connected by ducts 7 and 7, respectively.

In the above-mentioned overheating prevention device for the flame-holding tube 4, the secondary air is transferred to the guide tube 6.
No matter how you increase the flow velocity of the air that is supplied from the outside and flows between the flame stabilizing tube 4 and the guide tube 6, the static pressure will not drop outside the guide tube 6, so - The blowout of air is not suppressed.

Therefore, the flow rate of air passing through the back side of the flame-holding tube 4 is increased by the guide tube 6, and an appropriate amount of air can be supplied to the flame-holding tube 4. Since the plurality of holes 4a, 4a and the plurality of air holes 6a, 6a formed in the guide cylinder 6 are connected through ducts 7.7, if the flow velocity of the secondary air increases too much, Also, the ejection of secondary air is not suppressed, and therefore the flame is brought into close contact with the flame-holding cylinder 4, and a stable flame can be maintained at all times.

In addition, in the embodiment on the ridge, an example was shown in which the distance between the guide ill and the flame-holding tube 9 was constant, but in order to obtain a constant cooling effect at each part, the flame-holding tube 9 had a large diameter. It is also recommended that the space between the two be appropriately reduced toward the sides.

Note that the guide tube 6 does not necessarily have to be fixed to the inner wall surface of the combustion tube 1; as shown in FIG. Sometimes they are distributed.

The guide tubes 6 and 6' increase the flow rate of air passing through the back side of the flame stabilizing tube 4, allowing a sufficient amount of air to be supplied to the flame stabilizing tube 4. a plurality of air holes 6a, 6a and 6a', 6a' formed in the guide w16 and 6';
are connected by ducts 7 and 7, and a certain gap is formed between the large-diameter ends of the guide tubes 6 and 61 and the inner wall surface of the combustion tube 1, so that the secondary air Even if the flow velocity of the flame-holding cylinder 4 becomes too high, the blowout of the secondary air is not suppressed, and therefore, the flame can be kept in close contact with the flame-holding tube 4 and stabilized at all times.

〔Effect of the invention〕

Since the present invention is constructed as described above, according to the present invention, the flow rate of air passing through the back side of the flame stabilizing tube can be increased, and the flame stabilizing tube can be sufficiently cooled using secondary air. Further, even if the flow velocity of the secondary air increases too much, the ejection of the primary air is not suppressed, so that the flame can be brought into close contact with the flame-holding tube and the flame can always be stable.

Note that the present invention is not limited to the embodiment on ridges. That is, for example, in this embodiment, between the combustion tube 1 and the cone-shaped flame stabilizing tube 4, the guide tube 6 or 6', a plurality of holes 4a, 4a formed in the flame stabilizing tube 4, and a plurality of air holes 6a, 6a formed in the guide tube 6 or 6'.
6a' - and 6a' are connected by ducts 7.7, but the tips of the guide tubes 6 and 6' are movably supported in the combustion tube 1, and the ducts 7.7 are connected to each other by a telescopic structure. A duct may be used, and the interval between the flame stabilizing tube 4 and the guide tubes 6 and 6' may be appropriately adjusted so that the passing flow velocity can be set to a desired value. In addition, the shape and structure of each part can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of them.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a burner having an overheating prevention device for a flame-holding plate according to the present invention. FIG. 2 is a broken explanatory view showing the main parts of the embodiment. 1-----1・-1---------------------・-----m-
Combustion cylinder 2-------------11-----
-Manifold 2a・−・−m=−−−−・−・−・−−
−−・−・Gas outlet 3・−・・−・・−m=−・・−
−−・−−−−Gas supply pipe 4-m=−・・−m=−
−−・−−−−−−・−・Flame holding tube 4a・−−−−・−
・・−・−・−・・−・One hole 5−・−−−−−−・−−
-------...---Pilot burner 6.6 no ------1----Guide cylinder'''6a, 6a/-
−−−−−−−−−−−−−1 Air hole 7−・−・−1−
−−−−−−−−−−−−−−−−Duct patent applicant
Olympia Kogyo Co., Ltd. Agent (7524) Mogami Seita Part Figure 3 Tact Figure 1 Duct Figure 2 Combustion tube

Claims (1)

[Claims] 1) A manifold for releasing gas is provided inside the combustion cylinder, and the gas sent from the gas supply pipe is ejected from the gas release hole provided in the front opening of the manifold, The air sent into the combustion cylinder through a plurality of holes formed in the wall of the cone-shaped flame-holding cylinder attached to the front of the manifold is mixed with the gas ejected into the inside of the flame-holding cylinder, and the mixture is The gas is ignited and combusted by a pilot burner, and at the same time, between the combustion tube and the cone-shaped flame-stabilizing tube, the outer peripheral wall surface of the cone-shaped flame-stabilizing tube is covered with a desired spacing, and the outer periphery of the flame-stabilizing tube is covered. A burner equipped with a guide tube that prevents overheating of the flame-holding tube by increasing the flow velocity of air on the surface, characterized in that a duct is provided that leads from the outside of the guide tube to the inside of the flame-holding tube. and the above burner. 2) A burner having a flame stabilizing tube overheat prevention device according to claim 1, wherein the distance between the guide tube and the flame stabilizing tube is constant. 3) A burner having a flame stabilizing tube overheat prevention device according to claim 1, wherein the distance between the guide tube and the flame stabilizing tube is appropriately reduced toward the larger diameter side of the flame stabilizing tube.