JPS6126732Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a gas burner used in water heaters and the like.

Conventional technology Conventionally, this type of gas burner was
The one published in Publication No. 16813 is known.

In the device disclosed in Japanese Patent Publication No. 52-16813, fuel gas and primary air are sucked from the same direction into a mixing tube installed inside the casing, and then stirred by a primary fan and further stirred by a stirrer to mix them and burn them. It is designed to be supplied to the flame holes in the plate.

Therefore, it is necessary to provide a fan within the mixing tube, making the structure complicated and large.

Problems to be Solved by the Invention The problem to be solved by the invention is to completely mix fuel gas and primary air with a simple structure.

Means for Solving the Problem The technical means taken by the present invention to solve the above problem is to provide a mixing pipe that forms a burner port on the upper surface so as to cross inside the casing of the burner;
A primary air supply pipe is connected to one end of the mixing pipe, and a gas supply pipe is loosely inserted into the pipe from the other end, and the inner end thereof is extended to the vicinity of the air inlet of the mixing pipe. An impeller-shaped mixing element is attached to the outer periphery near the inner end, the outer periphery of the mixing element is brought into close contact with the inner peripheral surface of the mixing tube, and a combustion plate with a large number of flame holes is provided in the upper part of the mixing tube. be.

According to the above technical means of the present invention, the primary air supplied from the primary air supply pipe to the mixing pipe,
The fuel gas supplied from the gas supply pipe to the mixing pipe is
After first colliding and mixing at the air inlet of the mixing tube,
The mixture is further stirred and mixed by a mixing element and supplied from the burner port to the flame hole of the combustion plate.

Embodiment Hereinafter, an example of implementation of the present invention will be described based on the drawings.

This embodiment is a water heater, in which a burner a constitutes a lower body A ₁ of a main body A of the water heater with its casing part 1, and a combustion plate 20 with a large number of flame holes 2 is provided on the upper surface of the casing part 1. , the flame hole 2 is provided facing a combustion chamber b provided above the burner a.

A mixing pipe 19 and a gas supply pipe 4 are respectively inserted into the casing portion 1 by penetrating through a pair of opposing wall surfaces.

The mixing pipe 19 extends across the inside of the casing part 1, its distal end reaches close to the opposing wall surface of the casing part 1 and is closed, and its proximal end communicates with the primary air supply pipe 3.

Further, the mixing tube 19 has a burner port 5 formed on its upper surface.

The burner port 5 is constituted by a large number of holes 5' formed in the mixing tube 19.

Further, a proportional fan 7 is connected to the primary air supply pipe 3 via an air volume control valve 6.

The above air volume control valve 6 is a proportional fan 7
This system distributes all the air necessary for combustion of the gas supplied by the system into suitable primary air and secondary air. It is fed into the supply pipe 8.

The secondary air supply pipe 8 is an air volume control valve 6
It passes through the chamber wall 9 of the combustion chamber b, extends into the combustion chamber b, and faces the flame hole 2 of the burner a.

On the other hand, the gas supply pipe 4 is formed to have a smaller diameter than the mixing pipe 19, and the outwardly projecting portion of the casing portion 1 is equipped with a sequential solenoid valve 12, a gas burner 13, and a gas proportional valve 14 from the upstream side. The part inserted into the casing part 1 further passes through the closed end of the mixing tube 19 and into the mixing tube 19.
A gap 10 is formed between the outer circumferential surface of the mixing tube 19 and the inner circumferential surface of the mixing tube 19 .

Moreover, the inner end of this gas supply pipe 4 is connected to a burner port 5.
It extends near the air inlet of the mixing chamber 19 through below.

Therefore, in the mixing pipe 19, in front of the inner end of the gas supply pipe 4, there is a part where the gas sent from the pipe 4 collides with the air passing through the primary air supply pipe 3 and mixes, that is, a mixing chamber. 11 is formed.

The mixing chamber 11 communicates with the burner port 5 through a gap 10, and a mixing element 15 is disposed in the gap 10 between the mixing chamber 11 and the burner port 5.

The mixing element 15 is constructed by installing several blades 17 in the circumferential direction on the outer peripheral surface of a mounting ring 16, which has an inner diameter equal to the outer diameter of the gas supply pipe 4. The diameter matches the inner diameter of the mixing tube 19.

The mixing element 15 is installed between the mixing chamber 11 and the burner port 5 by fitting the mounting ring 16 onto the outer periphery near the inner end of the gas supply pipe 4, and attaches the tip of the blade 17 to the mixing pipe 19. Close to the inner circumferential surface.

Therefore, this mixing element 15 connects the gas supply pipe 4 to one
It also has the function of holding it coaxially with the secondary air supply pipe 3.

The blades 17 of the mixing element 15 have a gap between them so that the mixed gas can pass through, and are slightly twisted in the same direction so as to give rotation to the mixed gas passing through.

Thus, in the gas burner a, the fuel gas sent into the mixing pipe 19 through the gas supply pipe 4 collides with the air sent into the mixing pipe 19 through the primary air supply pipe 3 in the mixing chamber 11. mix,
It flows through the gap 10 to the burner port 5. At this time, on the way to the burner port 5, the mixture is rotated by the mixing element 15 to be further stirred and mixed, reaches the burner port 5, and is ejected from the flame hole 2 through the burner port 5, where it is combusted. . Secondary air necessary for this combustion is supplied via a secondary air supply pipe 8.

In the figure, reference numeral 18 denotes a control box which houses a control device for controlling the gas proportional valve 14, the proportional fan 7, and the air volume control valve 6 for each gas quality of the gas used, and is provided separately from the main body A of the water heater.

Effects Since the present invention has the above configuration, it has the following advantages.

(1) Fuel gas and primary air are mixed by collision between the two in the mixing chamber, and a mixing element gives rotation to the mixed gas, so gas and air can be completely mixed despite the simple structure. This eliminates the need for a separate stirring means such as a fan.

(2) Since the mixing element has the function of holding the gas supply pipe coaxially with the mixing pipe, no special structure is required to hold the gas supply pipe.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view schematically showing a gas burner according to an embodiment of the present invention in use, and FIG. 2 is an enlarged perspective view of the main parts, with some parts cut away. a...burner, 1...casing part, 2...flame hole,
3...Primary air supply pipe, 4...Gas supply pipe, 5...Burner port, 15...Mixing element, 19...Mixing pipe, 20...
Burning board.

Claims (1)

[Scope of utility model registration request] A mixing tube having a burner port formed on the upper surface is provided to cross the inside of the casing of the burner, and a primary air supply tube is connected to one end of the mixing tube, and a gas supply tube is loosely inserted into the tube from the other end. The inner end of the gas supply pipe is extended to the vicinity of the air inlet of the mixing pipe, and an impeller-shaped mixing element is attached to the outer periphery of the gas supply pipe near the inner end, so that the outer periphery of the gas supply pipe is brought into close contact with the inner peripheral surface of the mixing pipe. , a gas burner in which the casing is provided with a combustion plate having a large number of flame holes in the upper part of the mixing tube.