JP3148022B2 - 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 using petroleum as a fuel, and more particularly to a combustion apparatus used for a domestic cooking apparatus.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a burner head 3 having a large number of flame ports 2 is mounted on a vaporizer 1 and a vaporizer is provided on a side wall of the vaporizer 1 as shown in FIG. The front end of the fuel supply pipe 5 is provided so as to face the carburetor 1 via the air passage 4, and the other end of the fuel supply pipe 5 is connected to the fuel pump 6. On the other hand, the vaporizing air passage 4 is communicated with the air blowing means 7, and a part of the air blowing means 7 is also communicated with the combustion air passage 8 provided around the burner head 3. The carburetor 1, the fuel pump 6, the blowing means 7 and the like are installed in a box-shaped case 9, the upper part of the case 9 is opened, and the burner head 3 is exposed upward.
At the top of the case 9 around the burner head 3
When the air is sent to the vaporizing air passage 4 and the combustion air passage 8 by the blower 7 after the vaporizer 1 is heated by an electric heater or the like, the fuel is discharged. The mixture is supplied by a fuel supply pipe 5, vaporized in the vaporizer 1, is formed into an air-fuel mixture, is ejected from the flame opening 2, and is ignited by the air-fuel mixture.
Was formed.

[0003]

However, in the above-mentioned conventional configuration, when the capacity of the combustion device is reduced to be small for the convenience of the cooking operation, the characteristics of the combustion gas are deteriorated, so that there is a limit. There is a problem that the use of a small number of pieces makes the usability worse. In addition, since the flame is exposed at the upper part of the combustion device, the temperature of the outer wall of the case 9 and the surroundings of the case 9 is increased, and it is inconvenient to put the material or the like on the case 9 to perform the work. There is also a problem that a dangerous condition such as burns may be generated.

At the start of operation, since the blowing means 7 is driven first, there is a problem that fuel vapor remaining in the vaporizer 1 is discharged and fuel particles and odor are scattered around.

Further, even if the operation is stopped, there is a problem that there is a danger of burns or the like immediately after the operation is stopped because the temperature of the upper part of the case 9 and the temperature of the virtues 10 are high. The present invention solves the above-mentioned problems, and aims to improve the usability by expanding the squeezability of the capability of the combustion device and to lower the temperature of the outer body top plate, thereby improving the workability of cooking and ensuring safety. It is intended for planning.

Another object of the present invention is to increase the amount of air blown into the combustion chamber at the beginning of the operation and quickly discharge fuel particles and odor from the combustion gas outlet to improve the environment of the cooking operation.

Another object of the present invention is to improve the safety by increasing the amount of air blown into the combustion chamber at the end of operation, rapidly lowering the temperature of the top plate, preventing the occurrence of burns and the like.

[0008]

In order to achieve the above object, the present invention provides a combustion section, a combustion chamber provided downstream thereof,
A combustion gas passage communicating with the combustion chamber, an outer body provided around the combustion portion, the combustion chamber and the combustion gas passage, a heat receiving portion inserted into the combustion gas passage, and a ceiling integrally formed with the heat receiving portion. A plate, a blower communicating with the combustion section, a bypass air passage branched from the blower, an air flow switching chamber communicated with the bypass air passage, and a dilution air passage branched from the air flow switching chamber. And a cooling passage, provided in the air switching chamber, the switching device communicating the bypass air passage and the cooling passage at the time of rating, and a switching valve device communicating the bypass passage and the dilution air passage at the time of low combustion. The configuration is referred to as first problem solving means.

A second aspect of the present invention is a combustion apparatus provided with a switching valve device for connecting the bypass passage and the dilution air passage at the start of operation before ignition. Further, a configuration of a combustion device provided with a switching valve device for connecting the bypass passage and the dilution air passage at the end of the operation is defined as a third means for solving the problem.

[0010]

In the first means for solving the above-mentioned problems, air is introduced into the combustion gas flow to control the temperature of the combustion gas freely by dilution, thereby lowering the temperature of the heat receiving section and lowering the temperature of the top plate. Becomes Thereby, even if the capacity of the combustion apparatus is constant, the amount of heat transmitted from the top plate to the pot or the like can be reduced, so that the capacity can be narrowed down without deteriorating the characteristics of the combustion gas. In addition, since the temperature rise of the exterior body top plate due to a large amount of combustion during rated operation is cooled by the air for dilution, even if the cooking material is placed on the exterior body top plate, it will not be overheated and work Performance can be improved. Also, even if you touch the top panel during work, you will not get burned,
Safety can be ensured.

In the second means for solving the problems, a large amount of air flows from the combustion section and the dilution air passage into the combustion chamber and the combustion gas passage at the start of operation. For this reason, unburned fuel particles and odor remaining in the combustion chamber and the combustion gas passage can be quickly discharged to improve the environment of the cooking operation.

In the third means for solving the problem, a large amount of air flows from the combustion section and the dilution air passage into the combustion gas passage at the end of the operation. For this reason, the heat receiving part is cooled, and the temperature of the top plate is rapidly lowered, so that no burn is caused even if the top plate is touched during the cooking operation or after cooking, and safety can be improved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 12 denotes a combustion unit that atomizes or vaporizes liquid fuel and mixes it with combustion air to perform diffusion combustion or premix combustion. The combustion unit 12 is disposed so as to emit and spray atomized particles or vaporized gas in the lateral direction, and has a bottomed cylindrical shape whose inner wall is covered with a heat insulating material (not shown) such as glass wool or ceramic on the downstream side. Combustion chamber 13 is provided. In the upper part of the combustion chamber 13, a combustion gas passage 14 is developed toward the periphery of the combustion chamber 13. A downstream side of the combustion gas passage 14 is communicated with a cylindrical combustion gas outlet 15.
5 is provided so as to penetrate a part of an exterior body 16 provided so as to cover the combustion part 12, the combustion chamber 13, and the combustion gas passage 14. A plurality of plate-shaped heat receiving portions 17 are provided substantially at the center of the combustion gas passage 14 above the combustion chamber 13.
Are radially extending from the center to the circumferential direction.
And a flat top plate 18 that is assembled as an integral component is provided above the heat receiving unit 17. The heat receiving portion 17 and the top plate 18 are made of a heat-resistant material having good heat conductivity such as metal. The top plate 18 is provided in the combustion gas passage 1
4 and is mounted via a packing, a sealing material or the like (not shown) so that there is no leakage of combustion gas. The upper end of the top plate 18 is opened by penetrating the upper portion of the exterior body top plate 19 constituting the upper portion of the exterior body 16.

On the other hand, to the combustion section 12, the blowing side of blowing means 20 comprising a blower is connected. A tubular bypass air passage 21 branches off from a part of the blower side of the blower 20, and an air flow switching chamber 22 is provided at the other end of the bypass air passage 21. This air flow switching room 2
From 2, a dilution air passage 23 provided so as to surround an outer peripheral wall in the middle of the combustion chamber 13 communicates with the combustion chamber 13 through a plurality of air inlets 24 provided along the peripheral wall of the combustion chamber 13. Have been. A cooling passage 25, which is provided so as to surround the combustion gas passage 14, is communicated with the air flow switching chamber 22 along a lower portion of the exterior body top plate 19. A cooling air outlet 26 is connected to the cooling passage 25, with the tip penetrating a part of the exterior body 16. The air flow switching chamber 22 is provided with a switching valve device 27 for communicating the bypass air passage 21, the dilution air passage 23, and the cooling passage 25 with each other. The switching valve device 27 includes a dilution air passage 23 of the air flow switching chamber 22.
A dilution on-off valve 29 for opening and closing the dilution vent 28 provided on the side of the cooling passage 25 and a cooling on-off valve 31 for opening and closing the cooling vent 30 provided on the cooling passage 25 side are provided.
A ventilation port 32 is provided on the side wall of the exterior body 16 near the blowing means 20.
Is provided.

A fuel supply means 33 comprising a fuel pump is connected to the combustion section 12 via a fuel pipe 34. The fuel supply means 33 is provided on a sub-tank 35, and the sub-tank 35 is communicated with a leveler 36, and the leveler 36 is communicated with a fuel tank (not shown) outside the exterior body 16 via an oil feed pipe 37. I have. Blowing means 2
The fuel supply means 33 and control components (not shown) are installed in the exterior body 16. 38 in the figure is a flame, 39
A black arrow indicates a combustion gas flow, and a white arrow 40 indicates an air flow.

In the above configuration, when the operation of the combustion apparatus is started at the rated capacity (Hi combustion), the blowing means 20 is operated, and the combustion air is caused to flow into the combustion section 12 from the ventilation port 32. At this time, the dilution ventilation port 28 of the air flow switching chamber 22 is connected to the dilution on-off valve 2 of the switching valve device 27.
9, a portion of the combustion air is supplied from the bypass air passage 21 to the air flow switching chamber 22 and then flows into the cooling passage 25 through the opened cooling vent 30. Are discharged from the cooling air outlet 26 to the outside of the exterior body 16. Here, fuel is supplied to the combustion unit 12 by the fuel supply means 33, and an ignition device (not shown)
And the flame 38 of the rated capacity is
2 is formed. The combustion gas 39 of the flame 38 is supplied to the combustion chamber 13.
And flows into the combustion gas passage 14 and the combustion gas outlet 1
Exhausted from 6. At this time, the combustion gas 39 heats the heat receiving portion 17 while passing through the combustion gas passage 14, and the heat is received by the top plate 18, and the top plate 18 becomes hot. be able to.

Here, when the capacity is narrowed down to the extent that the characteristics of the combustion gas 39 of the flame 38 do not deteriorate, the combustion air distributed in accordance with the fuel supply amount of the fuel supply means 33 is supplied to the blower of the blower means 20 which constitutes the blower means 20. Correspondence is made by reducing the number of rotations.

To further reduce the capacity, the switching valve device 27 of the air flow switching chamber 21 is operated to open the dilution on-off valve 29 and open the dilution vent 28 so that a part of the combustion air is removed. After the stream 40 flows into the dilution air passage 23 and is introduced into the combustion chamber 13 from the air inlet 24,
By lowering the temperature of the combustion gas 39 by mixing with the combustion gas 39, the temperature of the top plate 18 can also be lowered. As a result, the capacity of the combustion device can be narrowed down,
There is an effect that various cooking operations can be performed and usability can be improved.

At the time of rated operation, the air flow 40 is caused to flow into the cooling passage 25 provided at the lower portion of the exterior body top plate 19, so that the exterior body top plate 19 around the top plate 18 is cooled and cooked. Even if the cooking material is placed on the exterior top plate 19 during the operation, it is not overheated, the workability can be improved, and even if the exterior body top plate 19 is touched during the operation, there is no burn, etc. There is an effect that the property can be secured.

Further, since heat is transmitted to the pot or the like via the top plate 18, the heat is dispersed like a direct fire and does not escape into the surrounding air, so that the heat efficiency is improved, the fuel efficiency is improved, and the economy is improved. There is an effect that a simple cooking device can be supplied.

Further, since the flat top plate 18 is only exposed outside the exterior body top plate 19, there is an effect that cleaning after cooking becomes easy. Further, since the combustion part 12 is not open to the outside, dirt such as boiling over during cooking does not enter the inside, and there is an effect that a good state can be maintained for a long time.

Further, since the flame 38 is not exposed to the outside of the exterior body 16, there is an effect that a safe cooking apparatus can be provided without burning. Next, at the start of operation, first, the bypass air passage 21 is communicated with the dilution air passage 23,
The air flow 40 is sent to the combustion chamber 13 and the combustion gas passage 14 through the dilution air passage 23, and the combustion air is sent from the combustion section 12 before the flame 38 is formed. Immediately discharging unburned fuel particles and odor remaining in the passage 14 to improve the environment of the cooking operation,
There is an effect that appropriate ignition can be performed by preventing explosion ignition or the like for the next ignition operation.

Next, at the end of operation, the bypass passage 2
1 to the dilution air passage 23 and the dilution air passage 2
3, the air flow 40 can be sent to the combustion chamber 13 through the combustion chamber 13. Therefore, when the operation of the combustion device is stopped, the air flow 40 and the combustion air from the combustion unit 12 that does not perform combustion cause the combustion gas passage. 14 to cool the top plate 18 exposed to the outside of the exterior body 16 to lower the temperature in a short time.
8 does not cause burns even when touched, and has the effect of improving safety.

[0024]

As is clear from the above description of the embodiments,
According to the combustion device of the present invention, the following effects can be obtained.

(1) Since the dilution air passage is communicated from the air flow switching chamber to the combustion chamber via the bypass air passage, the temperature of the combustion gas can be reduced by dilution of the air flow, and the characteristics of the combustion gas deteriorate. The ability to squeeze a small amount without any effort and can cope with various cooking tasks.

(2) At the time of rated operation, an air flow is caused to flow from the air flow switching chamber into the cooling passage, so that the temperature of the exterior top plate is lowered and cooking materials are placed on the exterior body plate. Operability is improved, and safety can be ensured without causing burns or the like even when touching the exterior top plate.

(3) Since the combustion air flows from the combustion section and the dilution air passage into the combustion chamber and the combustion gas passage at the start of the operation, unburned fuel particles and odor are quickly discharged, and the environment for the cooking operation is improved. Can be done.

(4) At the end of the operation, the combustion air flows from the combustion section and the dilution air passage into the combustion chamber and the combustion gas passage, so that the temperature of the top plate is reduced in a short time, and the occurrence of burns is prevented, and safety is prevented. Performance can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Combustion part 13 Combustion chamber 14 Combustion gas passage 15 Combustion gas outlet 16 Outer body 17 Heat receiving part 18 Top plate 19 Outer body top plate 20 Blowing means 21 Bypass air passage 22 Air flow switching chamber 23 Dilution air passage 25 Cooling passage 27 Switching valve apparatus

──────────────────────────────────────────────────続 き Continuing on the front page (72) Chinori Aso, 800 Tsutsui-cho, Yamatokoriyama-shi, Nara, Matsushita Household Equipment Co., Ltd. No. 1 Tonen Co., Ltd., Research Laboratory (72) Inventor Kami Higashimoto 1-3-1, Nishitsurugaoka, Oi-machi, Iruma-gun, Saitama Prefecture Tonen Co., Ltd. Research Laboratory (56) References JP, A) Japanese Utility Model Hei 3-3604 (JP, U) Japanese Utility Model Hei 1-73601 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 3/02 F24C 5/16

Claims (3)

(57) [Claims] 1. A combustion section for burning fuel, a combustion chamber provided downstream of the combustion section, a combustion gas passage derived from the combustion chamber, the combustion section, the combustion chamber, and the combustion gas passage. And a heat receiving portion inserted into a part of the combustion gas passage, and a top plate integrally formed with the heat receiving portion, the end of which is open to the outside of the exterior body. And an exterior body top plate that constitutes the outer wall of the exterior body through which an end of the top plate is penetrated, a combustion air blowing unit that is communicated with the combustion unit, and a part of the ventilation unit. A bypass air passage, an air flow switching chamber provided at the other end of the bypass air passage, a dilution air passage branched from the air flow switching chamber and connected to the combustion chamber, and a branch from the air flow switching chamber. A combustion gas passage is provided below the exterior body top plate. A cooling passage provided so as to be enlarged so as to surround it, installed in the air flow switching chamber, communicates the bypass air passage and the cooling passage during rated operation, and communicates with the bypass air passage during a low combustion amount. A switching valve device for communicating with the dilution air passage. 2. The combustion device according to claim 1, wherein the switching valve device connects the bypass air passage and the dilution air passage before ignition at the start of operation. 3. The combustion device according to claim 1, wherein the switching valve device communicates the bypass air passage and the dilution air passage when the operation is completed.