JP3355805B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus mainly used for home use and used for a water heater, a heater and the like.

[0002]

2. Description of the Related Art A conventional combustion apparatus has the structure shown in FIGS. That is, in FIGS. 4 and 5, reference numeral 1 denotes a vaporizer in which a heater 2 is embedded, a vaporization chamber 3 is provided inside, and a heat receiving fin 5 for receiving combustion heat is provided on the burner head 4 side. . The burner head 4 has primary flame ports 6 and secondary ports 7 arranged alternately, and is connected to the lower side surface of the vaporizer 1. 8 is a mixing chamber and 3 is a vaporization chamber.
The flow path from which the premixed gas flows to the burner head 4 is formed. The flow path is closer to the vaporizer 1 and deeper, and the distance from the vaporizer 1 becomes shallower, and the end portion 9 closes the lower surface of the burner head 4. are doing. Reference numeral 10 denotes a fuel nozzle, which is located in the primary air passage 11 and has a tip facing the vaporization chamber 3. A fuel pump 12 has a suction side connected to the fuel tank 13 and a discharge side connected to the fuel nozzle 10. A blower fan 14 is connected to the primary air passage 11 on the discharge side. 1
Reference numeral 5 denotes a secondary air passage, the inlet side of which is connected to the blower fan 14 (not shown), and the outlet side of which communicates with the secondary port 7.
The lower surface of the secondary port 7 is closed, and a large number of small holes are provided on the upper surface. The lower surface of the primary flame opening 6 is open and communicates with the space in the mixing chamber 8, and the upper surface is provided with a number of small holes. Reference numeral 16 denotes a combustion chamber formed above the burner head 4 and internally provided with an igniter 17 for an ignition operation at the start of combustion.

In this conventional combustion apparatus, when the heater 2 is energized and the carburetor 1 reaches a predetermined temperature, the fuel pump 12
The blower fan 14 is operated, and the fuel in the fuel tank 13 is supplied from the fuel nozzle 10 into the vaporization chamber 3, and the primary air is supplied into the vaporization chamber 3 through the primary air passage 11. The fuel comes into contact with the inner wall of the vaporizer 1 heated by the heater 2, vaporizes, mixes with the primary air in the vaporization chamber 3, becomes a premixed gas, passes through the mixing chamber 8 from the lower part of the vaporization chamber 3, The fuel is injected from the small hole into the combustion chamber 16 through the opening at the lower end of the primary flame port 6 and ignited by the igniter 17 to start combustion. Secondary air is 2
The fuel is discharged from the secondary air passage 15 through the small hole on the upper surface through the secondary port 7 to promote combustion. The heat source for vaporizing the fuel is all supplied by the heater 2 until the combustion is started, but when the combustion is started, most of the heat is received by the combustion heat because the heat receiving fins 5 are heated by the combustion flame. And continued to vaporize and burn the fuel. At this time, the premixed gas supplied into the mixing chamber 8 from the lower end of the vaporization chamber 3 is:
Due to the shape of the mixing chamber 8 gradually becoming shallower from the upstream side to the downstream side, the resistance applied to the flow of the premixed gas gradually increases, and the premixed gas flowing through the primary flame port 6 on the upstream side is reduced. By increasing the amount and suppressing the downstream side, it can be made almost uniform, and stable combustion of the flame has been performed.

[0004]

However, in the conventional combustion apparatus, the shape of the mixing chamber gradually becomes shallower from the upstream side to the downstream side, and the lower surface of the end portion of the burner head is closed by the mixing chamber. As a result, the premixed gas was uniformly supplied to the burner head and a stable flame was obtained.However, since the end of the burner head and the mixing chamber were closed, the temperature of the mixing chamber closed portion increased during combustion, resulting in mixing. There has been a problem that the material constituting the chamber is thermally deformed in long-term use, and the combustion performance is reduced.

The present invention has been made to solve the above-mentioned problems, and has a bar
It is an object of the present invention to prevent a temperature rise in a mixing chamber at a closed end portion of a nahead, and prevent a decrease in combustion performance due to thermal deformation of the mixing chamber.

[0006]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The combustion device of the present invention includes a vaporizer for vaporizing fuel, a burner head provided in connection with a lower side wall of the vaporizer, and a gas passage from the vaporizer to the burner head below the burner head. A bottomed mixing chamber to be formed, wherein the mixing chamber has an inclined surface such that it is deeper near the lower part of the vaporizer and becomes shallower as the distance from the vaporizer.
And one of the inclined surfaces at the end of the burner head.
A surface that is in close contact with the lower surface of the burner head.
An opening is provided at the center of the attachment surface .

[0007]

[Function] The mixing chamber becomes shallower from the entrance to the end.
And a sloped surface at the end
A part that is in close contact with the lower surface of the burner head is
Restricts premixed air supplied to burner head end at landing surface
Supply of a uniform premixed gas to the burner head.
And a burner is provided at the center of the contact surface.
It has a configuration that has an opening that does not contact the lower surface of the head.
Temperature of the mixing chamber due to heat conduction from the burner head, etc.
It is possible to suppress the rise and prevent the combustion performance from deteriorating due to thermal deformation.

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of a system of a combustion apparatus according to the present invention, FIG. 2 is a sectional view of a combustion section of the combustion apparatus according to the present invention, FIG.
(B) is a side view of the mixing chamber in the present invention. In the drawing, 21 is a carburetor in which a heater 22 is embedded,
A heat receiving fin 25 for receiving combustion heat is provided on the side of the burner head 24 having a vaporization chamber 23 inside. The burner head 24 has primary flame ports 26 and secondary ports 27 arranged alternately, and is connected to the lower side surface of the vaporizer 21.
Numeral 28 denotes a mixing chamber, which forms a flow path through which the premixed gas flows from the vaporization chamber 23 to the burner head 24. The flow path is closer to the vaporizer 21 and shallower as the distance from the vaporizer 21 increases.
The shape has an inclined surface like this. And Burnahe
Of the inclined surface of the mixing chamber 28 at the end of the pad 24
The contact surface 29 is tightly attached to the lower surface of the burner head 24.
To supply the premixed gas to the end of the burner head 24.
We are trying to regulate salaries. Also, the burner head 24
An opening is provided in the center of the contact surface 29 with the lower surface of the mixing chamber.
Where the inclined surface 28 does not contact the lower surface of the burner head 24
Minutes . Reference numeral 30 denotes a fuel nozzle and a primary air passage 31
, And the tip faces the inside of the vaporization chamber 23. A fuel pump 32 is connected to the fuel tank 33 on the suction side and to the fuel nozzle 30 on the discharge side. Reference numeral 34 denotes a blower fan whose discharge side is connected to the primary air passage 31. A secondary air passage 35 has an inlet connected to the blower fan 34 (not shown) and an outlet connected to the secondary port 27. The lower surface of the secondary port 27 is closed and a number of small holes are provided on the upper surface. Further, the lower surface of the primary flame outlet 26 is opened, and the mixing chamber 2 is opened.
8 communicates with the space inside, and has many small holes on the upper surface. A combustion chamber 36 is formed above the burner head 24 and has an igniter 27 provided therein for an ignition operation at the start of combustion.

Next, the operation will be described. To burn the combustion device, when the heater 22 is energized and the vaporizer 21 reaches a predetermined temperature, the fuel pump 32 and the blower fan 34 are operated,
The fuel in the fuel tank 33 is supplied from the fuel nozzle 30 to the vaporization chamber 2.
3 and the primary air is supplied into the vaporization chamber 23 through the primary air passage 31. The fuel comes into contact with the inner wall of the vaporizer 21 heated by the heater 22 and is vaporized, mixed with the primary air in the vaporization chamber 23, becomes a premixed gas, passes through the mixing chamber 28 from the lower part of the vaporization chamber 23, The fuel was injected from the small hole into the combustion chamber 36 through the opening at the lower end of the primary flame port 26, and was ignited by the igniter 37 to start combustion. The secondary air passes through the secondary port 27 from the secondary air passage 35 and is expelled from small holes on the upper surface to promote combustion. The heat source for vaporizing the fuel is
Heat is supplied by the heater 22 until the combustion is started. However, when the combustion is started, most of the heat is received by the combustion heat because the heat receiving fins 25 are heated by the combustion flame, and the vaporization and combustion of the fuel are continued with little electric power. Was. At this time, the premixed gas supplied from the lower end of the vaporization chamber 23 into the mixing chamber 28 has an inclined surface such that the mixing chamber 28 gradually becomes shallower from the upstream side to the downstream side , and has a burner head. 24
A part of the inclined surface at the end of the burner head 24
Because not of an adhesion surface 29, such as to be in intimate contact with the lower surface, increases according to the flow of the premixed gas resistance gradually, the amount of the premixed gas flowing through the primary flame hole 26 on the upstream side is increased,
The downstream side is suppressed , and the burner head 24
Almost uniformly premixed gas is ejected from the surface stoma performs stable combustion of the flame, further dense and the lower surface of the burner head 24
An opening is provided at the center of the mounting surface 29, and the inclined surface of the mixing chamber 28 is provided.
And the lower surface of the burner head 24
Thus, heat conduction from the burner head 24 is suppressed, and the mixing chamber 2
8 is prevented from rising.

As described above, according to the embodiment of the present invention, the mixing chamber 28 is gradually shallower from the upstream side to the downstream side, and at a part of the lower part of the end portion of the burner head 24.
Surface 2 for bringing the lower surface of burner head 24 into close contact with mixing chamber 28
9 so that the burner head 24
Regulate the flow of premixed gas at the end, burner head
Premixed gas is spouted almost uniformly from the small holes on the top of 24
The flame can be stably burned.
By providing an opening at the center of 9, the temperature rise of the mixing chamber 28 can be prevented.

[0011]

According to the combustion apparatus of the present invention, the air-fuel mixture at the time of combustion is made uniform and the flame is stabilized.
Part of the lower part of the burner head end is closed by the inclined surface of the mixing chamber
In addition, since the central portion of the closed surface is opened, it is possible to prevent a rise in temperature due to heat conduction from the burner head while maintaining combustion performance. Thus, it is possible to prevent a decrease in combustion performance due to thermal deformation.

[Brief description of the drawings]

FIG. 1 is a system side view of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a combustion portion of the combustion device in the embodiment.

FIG. 3A is a plan view of a mixing chamber in the embodiment. FIG. 3B is a side view of a mixing chamber in the embodiment.

FIG. 4 is a system side view of a conventional combustion device.

FIG. 5 is a sectional view of a combustion section of the combustion apparatus.

[Explanation of symbols]

21 vaporizer 24 burner head 28 mixing chamber 29 contact surface

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Seiichi Shinoda 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-5-256417 (JP, A) JP-A-5-256 322124 (JP, A) JP-A-3-207904 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 11/10 F23D 11/40-11/44

Claims (1)

(57) [Claims] 1. A vaporizer for vaporizing a fuel, a burner head connected to a lower side wall of the vaporizer, and a gas passage from the vaporizer to the burner head formed below the burner head. A mixing chamber at the bottom, the mixing chamber having a slope closer to the lower part of the vaporizer and having a slope that becomes shallower as the distance from the vaporizer ,
A part of the inclined surface at the end of the burner head is
A surface that is in close contact with the lower surface of the burner head is provided.
A combustion device with an opening in the center .