JPH02213606A - Forced combustion type gas burner - Google Patents

Abstract

PURPOSE:To prevent incomplete combustion, stabilize the combustion, and reduce the noise of combustion by forced supply of both primary air and secondary air by a fan, the primary air into a gas-burner assembly and the secondary air over the sides of the gas-burner assembly upward. CONSTITUTION:By turning on a combustion switch a fan is run; part of the air from the fan is sent through an inlet opening 2 and into a gas burner assembly 1 as primary air and a flammable gas is ejected from a gas nozzle 24 and supplied to the gas burner assembly 1. The remaining part of the air from the fan is sent rising over the sides of the gas burner assembly 1 as secondary air. The flammable gas and the primary air are mixed as they flow through a mixing section 3 and the mixture flows into a space inside ranges of vertical slits 6 from under the lower ends 9 of separating plates 7. The ranges of vertical slits 6 are open to the mixing section 3 only at the low ends 9 so that the mixed gas has its pressure evenly distributed as it flows into the space inside the ranges of vertical slits 6 and rises therein. The mixed gas is discharged gently through slit-shaped flame holes 5. The mixed gas is ignited and spreads over combustion surfaces 4 when it burns.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a forced combustion type gas burner used in domestic water heaters and bathtubs.

[Prior Art] In recent years, forced combustion type gas appliances have been introduced, which are configured to forcibly supply and exhaust combustion air by inserting a fan into the intake and exhaust passages of household gas appliances such as water heaters and bathtubs. has come to be used. 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 is configured to forcibly blow primary air supplied during the gas burner's rest period and secondary air that rises along the side of the gas burner body using a fan. Ru.

[Problem to be solved by the invention] However, due to the demand for higher capacity and smaller size of household gas appliances, when attempting to increase the load of gas burners, conventional gas burners suffer from flame failure due to lack of secondary air. complete combustion occurs;
It was difficult to achieve stable combustion.

In addition, in recent years, a capacity conversion function has become necessary for gas appliances, but when the capacity of a high-load gas burner is reduced, there is a risk of flame back phenomenon, and it is difficult to adapt to changes in combustion load. It was difficult.

In addition, when trying to increase the load with a small gas burner, a sufficient combustion area cannot be obtained, and the combustion flame vibrates violently, producing a loud combustion noise. Combined with the wind noise of the combustion air blown by the fan, the combustion flame becomes loud. This caused noise and was not suitable for installation in residential areas.

[Means for Solving the Problems] The present invention aims to solve the above problems by providing a forced combustion type gas burner with a new configuration. The edges are brought into close contact, the inlet opening for the gas and primary air, the mixing part for the gas and primary air, the cross section extending upward from the upper end of the mixing part across the mixing part, and closing at the apex, which is approximately reverse in cross section. Form a V-shaped combustion surface, drill slit flame holes along the hanging line on the combustion surface, arrange the slit flame holes in parallel on the combustion surface at appropriate pitch intervals, and place the slit flame holes on the back side of each slit flame hole. A gas burner body is formed by providing a vertical groove-shaped guide passage communicating with the mixing section at the lower end, and the primary air supplied into the gas burner body and the secondary air rising along the side surface of the gas burner body are mixed by a fan. Configured to force air.

Specifically, a separator plate is formed in which vertical slit holes are arranged in parallel at pitches corresponding to the slit flame holes, and the slit vertical holes are positioned on the back side of the slit flame holes, and a partition plate is placed behind the separator plate. By holding the separator plate in contact with the back side of the combustion surface and opening the slit vertical hole into the mixing part at the lower end, a vertical groove-shaped guide passage can be formed.9 The above gas burner body can also be used alone. However, depending on the capacity of the gas appliance, it is also possible to configure a burner section by arranging a plurality of gas burner bodies in a horizontal line in a burner case.

The configuration, operation, and effects of the present invention will be specifically explained below with reference to the drawings.

[Example] The drawing shows an example of the present invention, and the gas burner body (1) is
The inlet opening (2) for gas and primary air is formed by closely fitting the edges of the side plates, which are formed approximately symmetrically by sheet metal processing.
, gas and primary air mixing section (3), said mixing section (3)
A combustion surface (4) is formed that extends upward from the upper end of the combustion chamber across the mixing section (3) and has a substantially inverted V-shaped cross section that closes at the apex. Slit flame holes (5) are opened along the hanging line on the combustion surface (4), that is, in a vertically elongated shape, and the slit flame holes (5) are arranged in parallel on the combustion surface (4) at appropriate pitch intervals. ing.

A separator plate (7) is formed in which slit vertical holes (6) are arranged in parallel at pitches corresponding to the slit flame holes (5), and the slit vertical holes (6) are positioned on the back side of the slit flame holes (5), and combustion A separator plate (7) is in contact with the back surface of the surface (4). The back of the separator plate (7) has a partition plate (8
) is placed on its back, the separator plate (7) is sandwiched, and the slit vertical hole (6) is opened to the mixing part (3) at the lower end (9), so that each slit flame is On the back side of the hole (5), a longitudinal groove-shaped guide passage is formed which communicates with the mixing part (3) at its lower end.

The gas burner body (1) with the above configuration is made by processing a single steel plate into a substantially symmetrical sheet metal shape with the apex of the combustion surface (4) as the center, bending it along the center line, and forming a separator plate (7) and a partition. Board (
8) is fixed by welding or other means, and the edges are folded (1
0) Manufactured by

Note that the slit flame hole (5) formed along the hanging line on the combustion surface (4) can also be formed in parts. In the embodiment shown in Fig. 3, the slit flame hole (5) is formed by being divided into upper and lower parts, and the slit flame hole is also divided into a plurality of parts in consideration of the dimensions of the combustion surface, the load on the gas burner body, etc. There is no problem in composing the combustion surface.

The forced combustion gas burner of the present invention is configured such that a fan forcibly blows primary air supplied into the gas burner body and secondary air rising along the side of the gas burner body. (1) can be used alone, but as shown in Figures 4 and 5, multiple gas burner bodies (1) can be used in a burner case (20).
It is also possible to form a burner section by arranging them in a horizontal row.

The burner case (20) is formed into a horizontally long rectangular parallelepiped with an open top, an air inlet (22) is formed in the bottom (21), and a fan (not shown) is connected upstream of the air inlet (22). There is. A rectifier plate (23) formed by punching a large number of microholes at a distance above the air population (22) is provided in the burner case (20), and a rectifier plate (23) is provided within the burner case (20), and is spaced apart from the air flow plate (22). ) are arranged horizontally in a row on the current plate (23) at predetermined pitch intervals. Branch pipes (25) corresponding to the pitch interval of the gas burner body (1)
A gas nozzle (24) is provided protruding from the front surface of the gas nozzle (24), facing the inlet opening (2) of each gas burner body (1).
24) is provided, and a heat exchanger is installed in the upper part of the burner case (1) to constitute a forced combustion type gas appliance.

[Function] Next, the function of the present invention will be explained using the gas burner body (1) of the embodiment.
) will be explained.

In Fig. 2, the broken line arrows indicate the mixed gas, and the solid line arrows indicate the flow of air. When the combustion switch is turned on and the fan is operated, a part of the blown air flows from the inlet opening (2) to the gas burner body (1). ) as primary air, and at the same time, combustible gas is ejected from the gas nozzle (24) into the gas burner body (1). Other blast air rises as secondary air along the sides of the gas burner body (1). The gas supplied into the gas burner body (1) and the primary air are mixed in the mixing section (3).
It flows into the slit longitudinal hole (6), that is, into the longitudinal groove-shaped guide passage, from the lower end (9) of the slit longitudinal hole (6) of the separator plate (7). Slit vertical hole (
6), only the lower end (9) is open to the mixing part (3), so the pressure of the mixed gas is uniformly throttled and flows into the slit vertical hole (6), forming a vertical groove-shaped guide passage. The mixed gas discharged from the 9-slit flame hole (5) rises while being guided by the 9-slit flame hole (5) and is gradually and gently discharged from the 9-slit flame hole (5), and a combustion flame is formed on the combustion surface along (4). and burn.

[effect] The characteristic functions and effects of this invention are as follows.

A combustion surface is formed that extends upward from the upper end of the mixing section across the mixing section, and has a substantially inverted V-shaped cross section that closes at the apex, and the slit flame holes are arranged in parallel with the combustion surface at appropriate pitch intervals to prevent combustion. Since the combustion flame is formed along the surface, an extremely large combustion area can be obtained for each gas burner body, making it possible to increase the load of the gas burner. Air diffuses between the slit flame holes and pickpockets...! Since the hot gas discharged from the flame hole is sufficiently supplied, incomplete combustion due to lack of secondary air can be prevented and stable combustion can be achieved.

In addition, a vertical groove-shaped guide passage is provided on the back side of each slit flame hole, and the lower end communicates with the mixing section. Since the discharge is gradual and gentle, it is possible to prevent flame lifting during high-load combustion, and the vertical groove-shaped guide passage provided on the back of the slit flame hole communicates with the mixing section at the lower end, so that the slit flame hole can be directly Because it has a configuration that does not communicate with the mixing section,
It is also possible to prevent flame back phenomenon during low load combustion. Therefore, the applicable range of the combustion capacity of the burner is expanded, a stable combustion flame can be obtained that adapts to changes in combustion load, and it is possible to fully respond to the capacity conversion function of gas appliances.

In addition, since the combustion surface extends upward from the upper end of the mixing section across the mixing section and closes at the apex, it forms a combustion surface with an approximately inverted 7-shaped cross section, so the gas burner body is formed extremely flat and the secondary air is is supplied between the gas burner bodies without being shielded, so
In addition to being able to significantly reduce the wind noise of combustion air, as mentioned above, a sufficient combustion area is obtained and the combustion flame is stable, so combustion noise is also reduced, making it much quieter than conventional products. Gas appliances are available.

Furthermore, when a burner section is constructed by arranging a plurality of gas burner bodies in a horizontal line in a burner case, - as mentioned above, the gas burner bodies are formed extremely flat and have excellent secondary air diffusivity. This allows the gas burner bodies to be placed side by side in a high density, making it possible to further reduce the size of the burner unit and increase the load capacity. It has practical effects such as being able to set the

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an overall perspective view with a part of the gas burner body cut away, Fig. 2 is a sectional view taken along line A-A of Fig. 1, and Fig. 3 shows a slit flame hole divided. FIG. 4 is a side view of the embodiment formed in this manner, FIG. 4 is a sub-screen in which a plurality of gas burner bodies are arranged side by side, and FIG. 5 is a sectional view taken along the line B--B in FIG. 4. 1... Gas burner body, 2... Inlet opening, 3...
...Mixing part, 4--Combustion surface, 5--Slit flame hole, 6--Slit vertical hole, 7--Separator plate,
8... Partition plate, 20... Burner case patent applicant Atago Seisakusho Co., Ltd. Yoshimoss 4m U>B Sake 5m

Claims (1)

[Claims] 1. The edges of the side plates formed approximately symmetrically by sheet metal processing are brought into close contact, and an inlet opening for gas and primary air, a mixing area for gas and primary air, and a mixing area for the gas and primary air are formed. A combustion surface is formed which extends upward from the upper end across the mixing part, and has a substantially inverted V-shaped cross section that closes at the apex, and a slit flame hole is opened along a hanging line on the combustion surface, and the slit is closed. Flame holes are arranged in parallel on the combustion surface at appropriate pitch intervals, and a vertical groove-shaped guide passage is provided on the back side of each slit flame hole, the lower end of which communicates with the mixing section to form a gas burner body, and the gas is supplied into the burner body. A forced combustion type gas burner configured to use a fan to forcefully blow primary air that rises along the side of the gas burner body and secondary air that rises along the side of the gas burner body. 2. Form a separator plate with vertical slit holes arranged in parallel at a pitch that corresponds to the slit flame holes, position the vertical slit holes on the back side of the slit flame holes, and sandwich them between partition plates placed behind the separator plate to create a combustion surface. 2. A forced combustion type gas burner according to claim 1, wherein a separator plate is brought into contact with the back surface of the slit, and a longitudinal slit hole is opened to the mixing section at the lower end to form a longitudinal groove-shaped guide passage. 3. A forced combustion gas burner comprising a plurality of gas burner bodies according to claim 1 arranged horizontally in a row in a burner case to form a burner section.