JPH04122920U - Forced combustion gas burner - Google Patents

Abstract

(57) [Summary] [Purpose] A combustion surface is formed by arranging slit holes that cross the combustion surface, and a flame holding space is formed between the side wall rising from the mixing tube to the combustion surface. In a forced combustion gas burner formed by attaching a flame holding plate with an open top end,
Eliminating the influence of the upward flow of secondary air that rises along the flame holding plate prevents combustion flame lift, achieving stable combustion under a variety of conditions. [Structure] After bending the flame-holding plate toward the side wall at a position close to the upper end, stand it up, and with the opening groove between the combustion surface and the upper end of the flame-holding plate,
Flame holding grooves are formed on both sleeves of the combustion surface.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on the forced combustion type gas used in household gas appliances such as water heaters and bathtubs. It concerns the burner.

0002

[Conventional technology]

Recently, fans have been installed in the combustion air supply and exhaust passages of gas burners. Forces the primary air supplied into the mixing tube and the secondary air supplied to the combustion flame. Forced combustion type gas appliances can achieve smaller size and higher performance. Therefore, it is widely used.

0003 As a gas burner used in such forced combustion type gas appliances, The combustion surface is formed by arranging a large number of slit holes, and the gas valve is In order to adapt the burner from high to low loads, the side rising from the mixing pipe to the combustion surface A flame-holding space is formed on the wall, a flame-holding board is attached, and a row of small holes for discharging gas into the flame-holding space is placed on the side. Open grooves on the wall between the combustion surface and the top of the flame-holding plate form flame-holding grooves on both sleeves of the combustion surface. A means of achieving this has been proposed.

0004

[Problem that the idea aims to solve]

However, in this way, a flame-holding space is formed between the side wall and a flame-holding plate is attached to the gas bar. When a fan blows a large amount of air, it will rise along the flame holding plate. There is a danger that the combustion flame will lift due to the influence of secondary air. The setting of air flow rate was delicate. In particular, for gas appliances, the range of capacity switching, the type of gas used, etc. , gas pressure, equipment dimensions, usage conditions, etc., all of these conditions may vary. It was difficult to achieve satisfactory and stable combustion. In addition, flame retention is achieved with flame retention grooves. Because of this, the flame holding plate is easily burnt out and thermally deformed, making it difficult to maintain durability during long-term use. There were also problems with sex and safety.

[0005] This idea aims to solve these problems, and is designed to However, it is possible to prevent flame lift and achieve stable combustion under various conditions. The purpose of this invention is to provide a forced combustion type gas burner that can

[0006]

[Means to solve the problem]

In order to achieve these objectives, this invention has a flame-holding air space between the side walls as described above. In a forced combustion type gas burner with a flame holding plate attached with a space between the flame holding plate and the After bending toward the side wall near the edge, raise the opening between the combustion surface and the top of the flame holding plate. These grooves form flame-holding grooves on both sleeves of the combustion surface. Below are examples of drawings The structure and operation of this invention will be specifically explained using the following.

[0007]

【Example】

The forced combustion gas burner (1) shown in the drawing is symmetrical around the combustion surface (2). It is manufactured using the general method of bending a steel plate that has been bulged and joining the edges. Multiple combustion control gas burners (1) are lined up according to the capacity of the appliance to generate forced combustion gas. It constitutes the combustion part of the appliance. And for sucking gas, primary air Front opening (3), a mixture that mixes the gas sucked from the opening (3) and the primary air. A mixing pipe (4) is formed, and a combustion surface (2) is formed on the upper end surface of the mixing pipe (4). There is.

[0008] The combustion surface (2) has slit holes (11) arranged in a row across the combustion surface (2). A plurality of slit holes (11) (three in the example shown) are arranged in close proximity to each other. A group of slits is used, and the interval between the slit groups is set to be somewhat large. Mixing tube (4) A flame holding plate (7) with an open top end is attached to the side wall (5) rising from the side wall (5) to the combustion surface (2). A flame-holding space (6) is formed between the flame-holding plate (7) and the side wall (5). A horizontal row of small holes (8) is opened in the side wall (5) facing the flame holding space (6). It is formed so that gas may be discharged from (8) into the flame holding space (6). And keep The flame plate (7) stands up after being bent toward the side wall (5) (inward) at a position close to the top end. With the opening groove between the combustion surface (2) and the upper end of the flame holding plate (7), there is a groove on both sleeves of the combustion surface (2). A flame holding groove (9) is formed, and the upper end of the flame holding plate (7) is slightly lower than the combustion surface (2). is set in the correct position. The flame-holding plate (7) has an inward protrusion ( 10) is formed, and the protrusion (10) comes into contact with the side wall (5) to maintain the flame holding plate (7). It is maintained and reinforced.

[0009]

[Effect of invention]

In the forced combustion type gas burner (1) shown in the drawing, gas sucked from the opening (3) , the primary air is mixed in the mixing tube (4) and discharged from each slit hole (11) to the public. It is ignited by the known ignition means, and a main flame is formed on the combustion surface (2). In addition, the row of small holes (8 ) is discharged into the flame holding space (6), and a flame holding formation is formed on both sides of the main flame. Gently discharge from the groove (9), form a short flame, and burn, keeping both sides of the main flame flame-holding. to achieve stable combustion. Then, the second part rises along with the flame holding plate (7). The next air (12) is bent toward the side wall (5) close to the upper end of the flame holding plate (7). A vortex is generated at a certain point and goes around inward (wall recess effect), and the flame is held by secondary air. (12) Burns without being directly affected by the upward flow.

0010

[Effect of the idea]

The characteristic effects of this invention are as follows. After bending the flame holding plate (7) toward the side wall (5) at a position close to the upper end, stand it up. Open grooves between the combustion surface (2) and the upper end of the flame stabilizing plate (7) form flame stabilization on both sleeves of the combustion surface (2). Since the grooves (9) are formed, flame holding grooves ( 9), the secondary air forms a short flame holding plate and burns, rising along the flame holding plate (7). (12) generates a vortex at this point and goes around inside, above the secondary air (12). The influence of rising air flow is eliminated, preventing flame-holding lift even with large airflow volumes, resulting in stable combustion. can be realized.

[0011] In addition, the flame holding plate (7) is formed by bending it twice to stand up after bending it to the side wall (5) side. Therefore, thermal deformation is difficult to occur, and the upper end of the flame holding plate (7) forming the flame holding groove (9) is Because it stands up, it is cooled by the gas flow discharged from the flame-holding groove (9) and burns are prevented. It can prevent burnout and thermal deformation of the flame holding plate (7), and has excellent durability. Can be used safely for a long time.

[Brief explanation of drawings]

[Figure 1] A cutaway perspective view of the main parts of the forced combustion gas burner of this invention

[Figure 2] Plan view of the forced combustion gas burner of this invention

[Figure 3] Front view, also partially cut away

[Figure 4] Cross-sectional view taken along line A-A in Figure 3

[Explanation of symbols]

1 Forced combustion gas burner 2 Combustion surface 4 Mixing tube 5 Side wall 6 Flame holding space 7 Flame holding plate 8 Row of small holes 9 Flame holding groove 11 Slit hole

Claims (1)

[Scope of utility model registration request] Claim 1: A slit hole (1) that crosses the combustion surface (2).
1) are arranged in a row to form a combustion surface (2), and a side wall (5) rising from the mixing tube (4) to the combustion surface (2) is provided with a flame holding space (6) between the side wall (5) and the side wall (5). ) is attached to the flame stabilizing plate (7), which has an open upper end, and a row of small holes (8) for discharging gas into the flame stabilizing space (6) is opened in the side wall (5), and the flame stabilizing plate ( 7)
After bending it toward the side wall (5) at a position close to the upper end, raise it up, and hold it on both sleeves of the combustion surface (2) with the opening groove between the combustion surface (2) and the upper end of the flame holding plate (7). A forced combustion gas burner with a flame forming groove (9).