JPH05657Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a forced combustion gas burner used in domestic water heaters and bathtubs.

[Prior art] In recent years, forced combustion type gas has been developed in which a fan is inserted into the intake and exhaust passages of household gas appliances such as water heaters and bathtubs to forcibly supply and exhaust combustion air. Instruments have come into use. These forced-combustion type gas appliances have a heat exchanger with improved heat absorption compared to natural exhaust type gas appliances, allowing for smaller appliances and higher performance, making them a versatile household gas appliance. It is something. A gas burner built into a forced combustion type gas appliance has multiple gas burner bodies arranged side by side in a burner case, and primary air supplied into the gas burner body and secondary air rising along the side of the gas burner body. It is common that the air is forcibly blown by a fan.

[Problem that the invention aims to solve] However, due to the demand for higher capacity and smaller size of household gas appliances, when the gas burner bodies are arranged in a high density to increase the load of the gas burner, the secondary air The deficiency caused incomplete combustion of the flame, making it difficult to achieve stable combustion. In addition, increasing the load on the gas burner body in this manner tends to increase combustion noise and increase the risk of burnout of the flame hole surface and flame stabilizing plate.

[Means for solving the problems] This invention aims to solve the above problems by providing a forced combustion type gas burner with a new configuration. , a flame hole surface, a flame holding plate having a substantially V-shaped cross section extending upward across the flame hole surface, and a horizontal plane bent outward at the upper end of the flame holding plate to form a gas burner body;
Two rows of slit flame holes are formed along the side edges of the flame hole surface, and rows of small holes are placed above the slit flame holes, and vertical holes are placed between the rows of small holes in a flame holding plate in an alternating relationship. In a burner case with an open top surface, a row of slits are provided on the horizontal surface, and a burring surface is formed inward at the notched end of the vertical hole, and a row of slits are formed on the upper extension line of the row of small holes. A plurality of gas burner bodies are arranged side by side in a horizontal line with their horizontal planes in close contact, and the primary air supplied into the gas burner body and the secondary air rising along the side of the gas burner body are forcedly blown by a fan. A forced combustion type gas burner is configured to do so.

It is preferable that the slit rows are not perforated in the entire horizontal plane, but are intentionally provided with portions that are not perforated, since this improves flame transfer and ignition performance between adjacent gas burner bodies.

In addition, if a slit flame hole is formed by sandwiching two comb-like members between a separator with a roughly slit-shaped cross section inserted into the center of the flame hole surface and the inner surface of the gas burner body, gas and This is beneficial as it promotes miscibility with air.

Below, the configuration, operation, and effects of this invention will be specifically explained using the drawings.

[Embodiment] The drawing shows an embodiment of this invention, which is constructed by arranging a gas burner body 2 made of sheet metal in a burner case 1, and the gas burner body 2 has a gas inlet 3, a mixing part 4 for gas and primary air. , a flame hole surface 5 is formed.
Two comb-shaped members 6 are sandwiched between a separator 7 inserted into the center of the flame-hole surface 5 and having a substantially oval-shaped cross section and the inner surface of the gas burner body 2. The notch 8 communicates with the inside of the mixing part 4, and two rows of slit flame holes 9 are formed along the side edge of the flame hole surface 5. A flame holding plate 10 having a V-shaped cross section is provided extending upwardly across the flame hole surface 5, and the flame holding plate 10 has holes between small hole rows 11 at positions above the slit flame holes 9. Two vertical holes 12 (upper and lower) are juxtaposed at the same position, and therefore the rows of small holes 11 and the vertical holes 12 are arranged regularly on the flame-holding plate 10 in an alternating relationship, and the vertical holes 12 have notched ends. A burring surface 13 is formed inwardly. A horizontal surface 14 bent outward is formed at the upper end of the flame stabilizing plate 10, and a row of slits 15 is provided on the horizontal surface 14 so as to open at a position on the upper extension line of the row of small holes 11. Each of the front and rear ends 16 of 15 is intentionally constructed so as not to be perforated.

The gas burner body 2 described above is made by processing two steel plates 17 approximately symmetrically, fixing the comb-like member 6 and the separator 7, and folding the ends.
Mixing part 4, flame hole surface 5, flame holding plate 10, and horizontal surface 14
It is manufactured by integrally forming the

An air inlet 21 is formed in the bottom surface 20 of the burner case 1, which is a horizontally long rectangular parallelepiped with an open top surface, and a fan (not shown) is connected upstream of the air inlet 21. A secondary air baffle plate 22 having a space above the air inlet 21 is provided in the burner case 1,
Circular air holes 24 are formed at a constant pitch on the rising surface 23 of the secondary air baffle plate 22 to match the gas inlet 3 of each gas burner body 2. It is covered with a side plate 25 at a distance from the rising surface 23,
A primary air passage 26 communicating with the air hole 24 is formed from the space between the bottom surface 20 and the secondary air straightening plate 22. A primary air baffle plate 27 is provided in the primary air passage 26.
are interposed therebetween, and the primary air rectifier plate 27 and the secondary air rectifier plate 22 are formed with a large number of fine holes by punching. The gas burner body 2 is arranged horizontally in a row in the burner case 1 with the gas inlet 3 adapted to the air hole 24, the lower end held by the secondary air baffle plate 22, and the horizontal surface 14 abutted against each other in close contact with each other. Gas nozzle 2 protruding from the front of 28
9 is provided so as to face each air hole 24. A heat exchanger 30 is installed in the upper part of the burner case 1, and is configured so that combustion exhaust gas is discharged to the outside of the appliance body from an exhaust pipe (not shown) protruding from the upper surface of the heat exchanger 30. .

[Operation] Next, the operation of this invention will be explained with reference to the operating state of the embodiment.

When the fan is operated by turning on the combustion switch,
A part of the combustion air flowing in from the air inlet 21 is rectified by the primary air straightening plate 27 of the primary air passage 26, and is supplied as primary air into the gas burner body 2 from the air hole 24 and the gas inlet 3, and at the same time, the combustion air flows through the gas nozzle. Combustible gas is ejected from 29 into the gas burner body 2. The remainder of the combustion air is sent to the secondary air baffle plate 2.
2 and rises along the side of the gas burner body 2 as secondary air. The combustible gas and primary air supplied into the gas burner body 2 flow into the mixing part 4, enter the notches 8 of the comb-shaped member 6 from both sides, collide and decelerate, and the gas and primary air are The mixture is thoroughly mixed and the combustion gases are gently discharged from the slit flame hole 9. The combustion gas discharged from the slit flame holes 9 rises along the flame holding plate 10, and the secondary air rising along the side surface of the gas burner body 2 is supplied from the small hole rows 11 and the vertical holes 12 and is combusted. Here, a small amount of secondary air is supplied from the small hole array 11 along the combustion gas discharge direction, and a large amount of secondary air is supplied from the vertical holes 12 from both sides of the combustion gas discharge direction. Since the hole 12 has a burring surface 13 formed inward at the notched end,
The combustion flame 31 is formed along the surface of the flame stabilizing plate 10 in a floating state without touching the flame stabilizing plate 10 with its base, and furthermore, the slit row 1 of the horizontal plane 14
Secondary air is supplied from 5 along the discharge direction of the combustion gas, and the unburned gas that has reached the upper end of the flame stabilizing plate 10 is combusted here. Since the front and rear ends 16 of the slit row 15 are not intentionally opened, the flame is crushed only in these parts and interferes with the adjacent gas burner bodies, resulting in good flame transfer between adjacent gas burner bodies. .

[effect] The characteristic results of this invention are as follows.

The flame holding plate is formed with a roughly V-shaped cross section across the flame hole surface, and the combustion flame is formed along the flame holding plate, so a large combustion area is obtained and the gas burner can be used at a high load. be able to.

Then, rows of small holes are placed in parallel above the slit flame holes, and as mentioned above, secondary air is directly supplied to the base of the combustion flame from inside, and vertical holes are provided from both sides of the combustion flame. Since the secondary air is supplied indirectly, sufficient direct and indirect secondary air can prevent red flame combustion and achieve stable combustion. It is also permissible to juxtapose the gas burner bodies closely together, and it is possible to realize higher performance and smaller size of the gas burner as a whole.

In addition, a burring surface is formed at the notched end of the vertical hole, and as mentioned above, secondary air is supplied to the base of the combustion flame from the inside through the row of small holes, so the combustion flame flows from the flame holding plate. They are formed in a floating state, preventing the flame holding plate from burning out and improving durability.

In addition, a horizontal plane with a row of slits is provided at the upper end of the flame-holding plate, and unburned gas that has reached the upper end of the flame-holding plate is combusted here, so it can be used even if the height of the flame-holding plate is small. As a result, the height of the burner case can be designed to be small, allowing for a large combustion space between the burner and the heat exchanger, and achieving complete combustion and improved thermal efficiency at the same time.

In addition, as mentioned above, the combustion flame is gentle and is formed along the surface of the flame-holding plate, so the combustion noise can be suppressed to a low level, and the small hole rows, vertical holes, and Since the configuration supplies a large amount of secondary air from the slit row, it is possible to handle even small fan capacity and air volume, greatly reducing fan operating noise and combustion air wind noise compared to conventional products. It is something that can be done.

Furthermore, if the slit row is intentionally provided in a horizontal plane at a portion where no holes are formed, stable ignition of adjacent gas burner bodies can be achieved.

In addition, by forming a slit flame hole by sandwiching two comb-like members between a separator with a roughly slit-shaped cross section inserted into the center of the flame hole surface and the inner surface of the gas burner body, gas and Combustion gas completely mixed with air is gently discharged from the slit flame hole, achieving high-quality combustion.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; Fig. 1 is a partially cutaway overall perspective view, Fig. 2 is a partially cutaway perspective view of the gas burner body, and Fig. 3 is taken along line A-A in Fig. 1. A sectional view, Figure 4 is a sectional view taken along line B-B in Figure 2, and Figure 5
The figure is an exploded perspective view of the main parts, and FIG. 6 is an exploded plan view of the gas burner body. DESCRIPTION OF SYMBOLS 1... Burner case, 2... Gas burner body, 3... Gas inlet, 4... Mixing part, 5... Flame hole surface, 6... Comb tooth-shaped member, 7... Separator, 9...
... Slit flame hole, 10 ... Flame holding plate, 11 ... Small hole row, 12 ... Vertical hole, 13 ... Burring surface, 14
...Horizontal plane, 15...slit row.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Gas inlet, gas and primary air mixing part, flame hole surface, flame holding plate extending upward across the flame hole surface and having a substantially V-shaped cross section, and flame holding plate. A horizontal surface bent outward is formed at the upper end to form a gas burner body, two rows of slit flame holes are formed along the side edges of the flame hole surface, and a row of small holes is formed above the slit flame holes. Vertical holes are arranged parallel to the flame holding plate in an alternating relationship between the rows of small holes, a burring surface is formed inward at the notched end of the vertical holes, and an opening is formed at a position on the upward extension line of the rows of small holes. A plurality of gas burner bodies are arranged side by side in a horizontal line with the horizontal plane in close contact with each other in a burner case whose top surface is open and where a row of slits are provided on the horizontal plane. A forced combustion gas burner configured to forcibly blow secondary air rising along the sides using a fan. 2. The forced combustion type gas burner according to claim 1, wherein a portion where the slit row is intentionally not formed is provided on the horizontal surface. 3. The slit flame hole according to claim 1 or 2, wherein the slit flame hole is formed by sandwiching two comb-shaped members between a separator having a substantially slit-shaped cross section inserted into the center of the flame hole surface and the inner surface of the gas burner body. Forced combustion gas burner.