JPH01184321A - Combustion device for gas burner - Google Patents

Abstract

PURPOSE:To make a simple structure of a gas burner and facilitate its manufacturing by a method wherein a desired number of fine holes are formed in a side wall of a combustion casing, a suction fan is operated to absorb and discharge the combustion gas at a gas burner out of the combustion casing. CONSTITUTION:A gas burner 1 and a suction fan 9 are installed within a combustion casing 6. The desired number of fine holes 61 are formed in a side wall of the combustion casing 6 and a suction fan 9 is operated to cause combustion gas at a gas burner part 1 to be sucked and discharged out of a combustion casing 6. As the suction fan is operated, a part within the combustion casing becomes a negative pressure, a secondary air is supplied into the combustion casing through the fine holes. So, since it is not necessary to supply pressurized air by arranging the secondary air, its structure is simple and its manufacturing is easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) [Industrial Field of Application] This invention relates to a combustion device used in a gas burner.

[Prior art]

In a conventional combustion device for a gas burner, a required number of pores are formed at both ends of a burner port plate, and secondary air is supplied onto the burner port plate through these pores. Jitsukō 62-3
No. 4099).

[Problems with conventional technology]

However, in such conventional combustion devices, secondary air is supplied by separately providing a secondary air chamber on the back side of the pores and supplying pressurized air to this secondary air chamber. Therefore, the structure of the gas burner was complicated and it was difficult to manufacture.

(Structure of the Invention) [Means for Solving the Problems] This invention has been made to solve the above-mentioned disadvantages, and its structure is as follows: A gas burner part and a suction fan are installed in a combustion casing, A gas burner characterized in that a required number of pores are formed in the side wall of the combustion casing, and the combustion gas in the gas burner section is sucked and discharged to the outside of the combustion casing by operating the suction fan. It is a combustion device for

[Action of the invention]

The combustion device for a gas burner according to the present invention includes installing a gas burner section and a suction fan in a combustion casing, forming a required number of pores in a side wall of the combustion casing, and operating the suction fan. As a result, the combustion gas in the gas burner section is sucked and discharged outside the combustion casing, and as the suction fan operates, the inside of the combustion casing becomes negative pressure, and as a result, the combustion gas flows through the pores. Secondary air flows into the casing.

[Explanation of Examples]

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, 1 is a gas burner section of a gas water heater, and 2 is a control section, which controls the amount of raw gas and the amount of primary air supplied to the gas burner section 1. Further, 3 is an actuator for operating the control section 2. These gas burner section 1, control section 2, and actuator 3 are installed inside an outer casing 4.

First, the burner part 1 will be explained.

In FIGS. 1 and 2, 5 is a box of the gas burner section 1, and 6 is a combustion casing connected to the top of the box 5. The space between the burner port plate 53 (described later) and the heat exchanger 8 in the combustion casing 6 acts as a combustion chamber B.

Reference numeral 51 denotes a mixture storage chamber, which is formed at the lower part of the box 5. This mixture storage chamber 51 has an opening at the bottom, and a mixture (a mixture of secondary air and raw gas) is supplied from the control section 2 through this opening. 52 is a pressure equalizing plate installed on the box 5, and 53 is a flame outlet plate installed above this pressure equalizing plate 52. The air-fuel mixture whose pressure has been equalized by the pressure equalization plate 52 flows toward the flame port plate 53 . 531,531.
. . . are flame ports, which are bored in the flame port plate 53. These flame ports 531, 531°... jet out the air-fuel mixture above the flame port plate 53. This ejected air-fuel mixture is ignited to form an inner flame.

Next, 7 is a secondary air pipe, and the combustion casing 6
Inside, a hook is passed from one side wall to the other side wall, and both ends thereof are open to the outside of the combustion casing 6. ? 1
,71. ... are pores formed in the secondary air pipe 7. This pore 71.71. ... blows out secondary air above the inner flame and helps the combustion of the air-fuel mixture. Also, 61
．． 61. ... are also pores, and the combustion casing 6
is formed on the side wall of. This pore 61, 61. ...
The air outside the combustion casing 6 is injected into the combustion chamber B as secondary air. 72 is a water pipe, and the secondary air pipe 7
is penetrated by. This wood pipe 72 communicates with a water pipe 81 of a heat exchanger 8 to be described later, and prevents the secondary air pipe 7 from overheating. 8 is a heat exchanger, which is installed above the combustion chamber B. This heat exchanger 8 heats the water flowing through the water pipe 81.

63 is an exhaust port, which is formed at the upper end of the combustion casing 6. Further, 9 is a suction fan, which is installed on the outer wall of the exhaust port 63 in the combustion casing 6. When this suction fan 9 is operated by an electric motor 91, the combustion gas in the combustion chamber B is forcibly discharged to the outside of the combustion casing 6. Also, at this time, since the pressure inside the combustion chamber B is made negative, secondary air flows into the combustion chamber B through the pores 71.61, and the air-fuel mixture flows from the control section 2 into the combustion chamber B. Inflow.

Next, the control section 2 will be explained in detail based on FIG.

In the figure, 21 is the base cylinder of the control section 2 (large diameter section 21
1 and a small diameter portion 212), and is fixed to the lower surface of the box 5 of the burner portion 1. This base cylinder 21 is installed with its axis in the vertical direction, and has an air supply port 2 at the upper end.
2 with the mixer receiving chamber 51 (of the burner part 1).

23. 23 is an air introduction window, and the large diameter part 21 of the base tube 21
It is formed on one side. This air introduction window 23.23 communicates the inside of the base cylinder 21 with the outside air.

Further, 24 is a support cylinder, which is integrally formed with the base cylinder 21. This support tube 24 protrudes into the large diameter portion 211 of the base tube 21 and guides the forward and backward movement of a forward and backward tube 282, which will be described later. 25 is a raw gas introduction path, which is formed in the small diameter portion 212 of the base cylinder 21. This raw gas introduction path 25 is connected to the small diameter portion 2 of the base cylinder 21.
Raw gas is introduced into 12. Reference numeral 26 denotes a cylindrical valve face member, which is fitted into the small diameter portion 212 and fixed with a nut 261. Further, 262 is an annular valve seat, which is fixed to the tip opening of the valve face member 26.

The function of this valve seat 262 will be determined later. 263 is a shaft hole bored in the lower end of the valve face member 26 (in FIG. 1); 27
is an operating rod fitted into this shaft hole 263 so that it can move forward and backward. 271 is a valve body, which is integrally formed in the middle of the operating rod 27. The outer wall surface of this valve body 271 is formed into a tapered shape, and together with the annular valve seat 262, the raw gas amount control valve G
Configure.

The raw gas amount control valve G adjusts the amount of raw gas passing through by increasing and decreasing its opening area by moving the operating rod 27 back and forth.

On the other hand, 221 is an annular valve seat, which is fixed to the periphery of the air supply port 22 of the base cylinder 21. The inner wall surface of this valve seat 221 has a tapered shape. Reference numeral 28 denotes a disk-shaped valve body, which is fixed to the tip of the operating rod 27 with a nut 281. Therefore, this valve body 28 can move forward and backward as the operating rod 27 moves forward and backward.

Reference numeral 282 denotes a reciprocating cylinder, which is protruded from the lower surface of the valve body 28. The reciprocating cylinder 282 is fitted into the support cylinder 24 so as to be retractable and retractable in an airtight manner, thereby preventing raw gas from leaking. 283,283. . . are ejection holes, which are formed radially on the circumferential surface of the valve body 28. Therefore, the raw gas inside the reciprocating cylinder 282 flows through the ejection holes 283, 283.・・・
can flow into the mixture receiving chamber 51 (of the burner part 1) while mixing with the bottom air. Note that the valve body 28 and the valve seat 221 constitute a single-bottom air amount adjusting valve A. The bottom air amount control valve A increases or decreases its opening area by moving the operating rod 27 back and forth, thereby adjusting the amount of primary air flowing into the mixture storage chamber (of the burner part 1) 51.

Next, the operation of this embodiment will be explained.

When the operating rod 27 is appropriately moved downward by the actuator 3, that is, pushed in, the opening areas of the raw gas amount control valve G and the bottom air amount control valve A become larger (see the state indicated by the virtual line in FIG. 3). . For this reason, the mixture storage chamber (burner part 1
) 51 and thus the amount of air-fuel mixture supplied to the gas burner section 1 increases, resulting in an increase in the amount of combustion heat in the burner section 1. When the operation of the actuator 3 is completed, the operating rod 27 returns to its original state by the action of a return spring (not shown). 4. The secondary air flows through the pores 61 and 61 of the combustion casing 6.
．． ... and the pores 71°71 of the secondary air pipe 7, ...
According to the operation of the suction fan 9, it is constantly supplied.

〔Effect of the invention〕

The combustion device for a gas burner according to the present invention includes installing a gas burner section and a suction fan in a combustion casing, forming a required number of pores in a side wall of the combustion casing, and operating the suction fan. As a result, the combustion gas in the gas burner section is sucked and discharged outside the combustion casing, and as the suction fan operates, the inside of the combustion casing becomes negative pressure, and as a result, the combustion gas flows through the pores. Secondary air flows into the casing.

Therefore, if you use this gas burner combustion device,
Since there is no need to separately provide a secondary air chamber and supply pressurized air to this secondary air chamber as in the prior art, the structure is simple and easy to manufacture.

[Brief explanation of the drawing]

The drawings show an embodiment of the combustion apparatus for a gas burner according to the present invention, and FIG. 1 is a front sectional view, FIG. 2 is a sectional view taken along line nn in FIG.
It is an enlarged sectional view of the ■ part in the figure. 1... Gas burner part" 6... Combustion casing 61... Pore 9... Suction fan Fig. 1-■ L, II Fig. 2

Claims (1)

[Claims] (1) A gas burner part and a suction fan are installed in the combustion casing, and a required number of pores are formed in the side wall of the combustion casing, and the suction fan is operated to open the gas burner part. A combustion device for a gas burner, characterized in that combustion gas is sucked and discharged outside the combustion casing.