JP2004012018A - Combustion equipment and cooking device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooking device with a burner that quickly starts up and has a wide variation range of the amount of combustion, which enables a wide range of heating cooking from highly efficient baking to heat retaining. <P>SOLUTION: A combustion body 4 made of a fiber assembly 7 of a metal small-gauge wire 6 where an oxide layer 5 is formed on the surface is provided at a burner body 1 for composing the burner 14. The amount of blast from a blowing means 15 is optimized by a blowing control means 20 in linking with a means 17 for controlling the amount of a combustion gas via a blowing path 16 directly connected to the burner 14, thus preventing blow-off or backfire even if the amount of combustion is changed and achieving the burner 14 for obtaining a red-heat state with an air/fuel ratio near a theoretical amount of combustion air. By using the burner for the cooking device, the cooking device 40 for a wide range of heating cooking from highly efficient baking cooking to heat retaining is provided. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a combustion device provided with a burner using gas or the like as a fuel, and a cooker using the same as a heating source.
[0002]
[Prior art]
As a burner in a conventional combustion apparatus, there has been a burner described in JP-A-8-54107. As shown in FIG. 8, this burner heats an aluminum-plated steel plate provided with a large number of flame ports 60, forms an infrared radiation film of an alloy layer of Fe and Al on the surface, and performs blackening treatment. In this configuration, the body 61 is fitted to the burner main body 62, and radiant heat is radiated from the infrared radiation film heated by the surface combustion in the combustion body 61, and the food is baked and cooked.
[0003]
[Problems to be solved by the invention]
However, in the conventional combustion device, the fuel premixed gas ejected from the large number of flame ports 60 burns near the flame ports 60, and the flames formed by the adjacent flame ports 60 interfere with each other to form a film-shaped flame. Is formed. In addition, the thickness of the combustion body 61 is at least 0.5 mm or more in consideration of corrosion resistance and the like. Therefore, the diameter of the flame outlet 60 needs to be approximately equal to or greater than the thickness due to the normal processing limit. Therefore, the diameter of the flame outlet 60 was 0.5 mm or more. Therefore, when the combustion air is supplied to near the theoretical combustion air amount, the combustion body 61 glows red and causes a flashback, and when the combustion amount is greatly reduced, the ejection speed of the fuel premixed gas from the flame outlet 60 and the combustion speed increase. The speed could be out of balance and cause a flashback. Therefore, the combustion air amount was suppressed to 70 to 80% of the theoretical combustion air amount to suppress the red heat of the combustion body, and the thermal power was actually reduced by only about 30%. When such a burner is applied to a baking cooker, it takes a certain amount of time for the combustion body 61 itself to emit radiation due to a rise in temperature. It has not been possible to realize a relatively low-temperature atmosphere that can keep the object warm.
[0004]
The burner 60 heats an aluminum-plated steel sheet to 700 to 800 ° C. to form an infrared radiating film of an alloy layer of Fe and Al on the surface. Is most excellent, and the alloy layer of Fe and Al formed after heating tends to be microscopically porous, and the steel plate portion of the base material is partially exposed on the surface. In particular, when this was used as a burner, the base where the flame port 60 was formed was completely exposed, and the corrosion resistance itself tended to decrease. Furthermore, thermal expansion due to surface combustion in the combustion body 61 or shrinkage during fire extinguishing causes not only squeak noise, but also accelerates peeling of the alloy layer, lowers the corrosion resistance as a whole, and burns such a burner. When used in a cooker, there has been a problem that the flame port 60 may be corroded due to long-term use, and the flame diameter may be enlarged or clogged.
[0005]
The present invention solves the above-mentioned conventional problems, and realizes an efficient heating state by supplying combustion air up to about the theoretical combustion air amount to accelerate the rise of red heat, and at the same time greatly vary the combustion amount. The main purpose is to provide a combustion device equipped with a burner that realizes stable combustion without flashback and secures even higher corrosion resistance.Using this combustion device, a wide range of cooking from firing to heat retention is possible. It is intended to provide a simple cooker.
[0006]
[Means for Solving the Problems]
The present invention, in order to achieve the above object, a burner containing a plate-like combustion body made of a thin metal wire or a fiber assembly of ceramics in the burner main body, and blowing means connected to the burner main body via a blowing path, A fuel gas amount adjusting means connected to the burner body and an air blowing control means are provided, and the fuel gas amount adjusting means and the air blowing controlling means are linked.
[0007]
According to the above invention, since the combustion body is formed of a thin metal wire or a fiber aggregate of ceramics, the contact area between the fibers is reduced, suppressing mutual heat conduction, and sewing a gap between the fibers. In this way, the premixed gas passes, so that even if a flame is formed on the combustion surface of the combustion body, a high temperature state can be realized relatively quickly on the combustion surface, but the rise in temperature inside and on the back of the combustion body is suppressed. Even if the amount of combustion is greatly reduced, the occurrence of flashback can be prevented. At this time, the fuel premixed gas passing through the combustion body is close to the theoretical combustion air amount by the air blowing means set to the air blowing amount according to the fuel gas amount via the air blowing control means interlocked with the fuel gas amount adjusting means. And the downstream surface of the combustion body is in a red-hot state according to the amount of fuel gas, so that radiant heat with high efficiency can always be generated. Therefore, it is possible to secure a burner with a rapid rise of red heat and a wide range of variable combustion amount, and a wide range of heating cooking from efficient baking cooking to keeping heat in the oven, which was extremely difficult in the past. Can be realized.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 includes a burner in which a plate-like combustion body made of a thin metal wire or a ceramic fiber aggregate is housed in a burner main body, blowing means connected to the burner main body via a blowing path, and a burner main body. Equipped with connected fuel gas amount adjustment means and air flow control means, and by interlocking the fuel gas amount adjustment means and air flow control means, the contact area between fibers becomes smaller and mutual heat conduction is suppressed. In addition, since the fuel premix gas passes through the gaps between the fibers, even if a flame is formed on the combustion surface of the combustion body, the temperature rise inside and on the back of the combustion body is suppressed, and the amount of combustion is reduced. Even if the aperture is greatly reduced, the occurrence of flashback can be prevented. At this time, the fuel premixed gas passing through the combustion body is close to the theoretical combustion air amount by the air blowing means set to the air blowing amount according to the fuel gas amount via the air blowing control means interlocked with the fuel gas amount adjusting means. And the downstream surface of the combustion body is in a red-hot state according to the amount of fuel gas, so that radiant heat with high efficiency can always be generated. Therefore, it is possible to secure a burner which has a rapid rise of red heat, is efficient and has a wide combustion amount variable range.
[0009]
According to a second aspect of the present invention, the blower control means keeps the output to the blower means such as a fan constant by changing the opening area in the blower path in conjunction with the fuel gas amount adjusting means. However, the amount of air blow can be varied in response to a change in the amount of fuel gas.
[0010]
According to a third aspect of the present invention, the air blowing control means varies the air blowing amount in the air blowing path by changing the output to the air blowing means such as a fan in conjunction with the fuel gas amount adjusting means. The air blowing amount can be set according to the amount of fuel gas without requiring the above mechanism.
[0011]
According to a fourth aspect of the present invention, the blower control means operates faster than the fuel gas amount adjusting means when decreasing the fuel gas amount, and operates later than the fuel gas amount adjusting means when increasing the fuel gas amount. By operating, the blowing means can be controlled so as not to be in the state of excessive blowing when the fuel gas amount is changed, and as a result, blowout can be prevented.
[0012]
According to a fifth aspect of the present invention, the combustion body is formed by compressing and solidifying a fiber aggregate of a thin metal wire or a ceramic into a plate shape, thereby suppressing a change such as a fray of the fiber due to a long-time combustion or intermittent. In addition, it is possible to prevent the combustion body from deteriorating with time, and at the same time, it is possible to reduce the thickness of the combustion body by compression and solidification, thereby realizing a thin burner.
[0013]
According to a sixth aspect of the present invention, the combustion body is obtained by sintering an aggregate of thin metal wires made of a heat-resistant and corrosion-resistant steel containing Fe and Cr as main components and giving the surface of the thin metal wires a gray-black or black-blue color. The formation of the oxide film not only improves the emissivity of the combustion body to increase the heating efficiency, but also improves the corrosion resistance of the combustion body by the oxide film, thereby extending the life.
[0014]
In the invention according to claim 7, the oxide film is a compound selected from metal oxides of Al ₂ O ₃ , SiO ₂ , FeO, Fe ₃ O ₄ , Fe ₂ O ₃ , Cr ₂ O ₃ , and NiO. By using as a component, the heat resistance and corrosion resistance of the combustion body can be improved, and at the same time, an oxide film having a high emissivity can be realized.
[0015]
According to an eighth aspect of the present invention, the combustion body has semi-permanent durability by using a compound selected from ceramics of Al ₂ O ₃ , SiO ₂ , SiC, and Si ₃ N ₄ as components. A burning body can be realized.
[0016]
According to a ninth aspect of the present invention, the combustion device according to any one of the first to eighth aspects is provided, and the burner is provided downward and at the upper part of the firing chamber, whereby the rising of red heat is fast and the combustion amount is variable. Since a burner having a range can be ensured, it is possible to perform a wide range of heating cooking from efficient baking cooking to heat retention at a low combustion amount, which has been difficult in the past.
[0017]
According to a tenth aspect of the present invention, there is provided the combustion device according to any one of the first to eighth aspects, wherein a burner is provided at an upper portion of the firing chamber with the burner facing downward, and a stirring blade connected to a blowing means is provided in the firing chamber. With the provision, the hot air from the burner can be uniformly filled in the firing chamber. Therefore, even if there is no lower heating means below the firing chamber, the object to be heated can be entirely heated, and the effective heating volume of the firing chamber can be expanded.
[0018]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
(Example 1)
First Embodiment A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a combustion device of the present embodiment, FIG. 2 is a front view showing a combustion surface of a burner of the combustion device, FIG. 3 is a partially enlarged view of a fiber aggregate of fine metal wires, and FIG. It is the elements on larger scale of an assembly.
[0020]
In the figure, reference numeral 1 denotes a burner body made of a heat-resistant metal such as an aluminum-plated steel plate or stainless steel, which constitutes a mixing tube 2 for a premixed fuel gas and a diffusion chamber 3 having a substantially rectangular recess communicating with the mixing tube 2. The central portion of the burner body 1 surrounded by the diffusion chamber 3 has a substantially planar shape.
[0021]
Reference numeral 4 denotes a heat-resistant and corrosion-resistant steel mainly composed of Fe and Cr, for example, a ferritic stainless steel such as SUS430 and SUS436, and a heat-resistant and corrosion-resistant steel such as austenitic stainless steel such as SUS304, SUS316 and SUS321, and the surface is oxidized. The burner body 1 is installed so as to cover the diffusion chamber of the burner main body 1 with a substantially rectangular burner composed of a fiber aggregate 7 of the thin metal wires 6 on which the coating 5 is formed. On the other hand, the wire diameter of the thin metal wire 6 of the combustion body 4 is preferably 100 μm in the range of 50 to 150 μm, and the porosity of the aggregate 7 of the thin metal wire 6 is 80 to 95%, preferably 90%. Further, the thickness of the fiber assembly 7 of the thin metal wire 6 is appropriately 1 to 5 mm, but in consideration of the pressure loss when the fuel premix gas passes through the combustion body 4 and the temperature rise of the combustion body 4, the thickness is 2 mm. Is optimal.
[0022]
Further, the combustion body 4 may be a fiber aggregate 9 of ceramics 8 selected from oxides of Al ₂ O ₃ , SiO ₂ , SiC, and Si ₃ N ₄ .
[0023]
The contact portion between the peripheral end of the burner 4 and the burner main body 1 is formed by a frame 10 at the outer peripheral end of the burner 4 and the central flat portion of the burner main body 1 at the inner peripheral end of the burner 4. Each is fixed by a fixing plate 11 to be covered, thereby preventing the displacement of the combustion body 4 and the leakage of the fuel premixed gas. As described above, the combustion surface 12 is formed at the portion of the combustion body 4 exposed to the outside air, and the non-combustion region 13 is formed at the center of the burner main body 1 to constitute the burner 14.
[0024]
On the other hand, the mixing pipe 2 of the burner main body 1 is connected to an air passage 16 which is directly connected to an air blowing means 15 composed of a fan. Further, a gas nozzle 18 which is directly connected to a fuel gas amount adjusting means 17 of a type in which the amount of fuel gas is adjusted by changing the degree of opening of the gas flow path by an electromagnetic valve or the like faces from the air passage 16 into the mixing pipe 2. In. Further, an opening / closing mechanism 19 directly connected to the stepping motor is provided in the air passage 16, and is provided as an air blowing control means 20 in electrical interlock with the fuel gas amount adjusting means 17.
[0025]
As described above, the combustion device 21 is constituted by the burner 14, the air passage 16, the fuel gas amount adjusting means 17, the air blowing means 15, and the air blowing control means 20.
[0026]
Next, the operation and action will be described. A fixed amount of fuel gas is ejected from the gas nozzle 18 into the mixing pipe 2 through the fuel gas adjusting means 17. At the same time, the opening and closing mechanism 19 is operated to change the opening area in the air passage 16 in order to secure the amount of combustion air blown in accordance with the amount of fuel gas through the electric signal from the fuel gas amount adjusting means 17. The amount of air from the blowing means 15 is adjusted, and the amount of air near the theoretical combustion air amount is supplied into the mixing pipe 2. Thus, the fuel premixed gas mixed to the ideal air-fuel ratio is supplied into the burner main body 1.
[0027]
Next, the fuel premix gas passes through the gap between the fine metal wires 6 in the combustion body 4 and is ignited by some ignition means (not shown) in the vicinity of the combustion surface 12 on the surface of the combustion body 4. The temperature of the thin metal wire 6 existing near the combustion surface 12 of the combustion body 4 rapidly rises, and the entire combustion surface 12 of the combustion body 4 becomes almost instantaneously in a high-temperature red heat state with no visible flame. At this time, since the contact area between the fine metal wires 6 is very small, the heat conduction between the fine metal wires 6 is suppressed, so that the back surface of the combustion body 4 is cooled by the flow of the fuel premixed gas, and the temperature rise is suppressed. Is done. Further, since the premixed fuel gas passes through the gap in which the fine metal wires 6 in the combustion body 4 penetrate, the occurrence of flashback can be prevented.
[0028]
Further, when the fuel gas amount is changed by the fuel gas amount adjusting means 17, the opening / closing mechanism 19 is operated by the above-described operation, and the combustion air amount is simultaneously adjusted. Therefore, since the combustion air amount can be set to an ideal air-fuel ratio in synchronization with the change in the fuel gas amount, it is possible to always increase the flame holding property, and as a result, a burner 14 capable of securing a wide combustion amount variable range is realized. it can.
[0029]
In addition, since the central portion of the burner body 1 is the non-combustion region 13, a uniform heating state can be achieved without the central heating of the target heated object surface being concentrated.
[0030]
Further, since the oxide film 5 is formed on the surface of the thin metal wire 6, the red heat of the combustion surface 12 is effectively radiated as radiant heat, and the temperature rise of the combustion surface 12 can be suppressed.
[0031]
Furthermore, when the fiber assembly 9 of the ceramics 8 is used for the combustion body 4, it is excellent in heat resistance and corrosion resistance, so that it can be used semi-permanently as the combustion body.
[0032]
Therefore, it is possible to secure the burner 14 which can rapidly burn red heat and perform stable combustion in a wide variable combustion amount range.
[0033]
(Example 2)
A second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a configuration diagram of the combustion device of the present embodiment.
[0034]
The difference from the first embodiment is that the combustion device 30 does not provide the air blowing control means in the air blowing path 31 and adjusts the voltage output to the air blowing means 15 in conjunction with the fuel gas amount adjusting means 17 to control the fan. The point is that an air blowing control means 32 for changing the rotation speed is provided. Further, the blowing control means 32 controls the blowing means 15 earlier than the operation of the fuel gas amount adjusting means 17 to reduce the fuel gas amount when the fuel gas amount is reduced, and increases the fuel gas amount when the fuel gas amount is increased. The point is that the gas amount adjusting means controls the blowing means 15 later than the operation of increasing the fuel gas amount. Note that components having the same reference numerals as those in the first embodiment indicate the same structure, and description thereof will be omitted.
[0035]
Next, an operation and an operation will be described. When the fuel gas amount is reduced from a state in which the burner 14 is burning at a constant combustion amount, a signal indicating a decrease in the fuel gas enters the fuel gas amount adjusting means 17. At the same time, the air blowing control means 32 lowers the voltage output to the air blowing means 15 to reduce the number of revolutions of the fan, thereby reducing the amount of combustion air to the burner main body 1, and thereafter, the fuel gas amount adjusting means 17 is actually operated. Reduce fuel gas volume. Conversely, when increasing the fuel gas amount, the fuel gas amount adjusting means 17 first reduces the fuel gas amount, and then the blower control means 32 increases the voltage output to the blower means 15 to increase the rotation speed of the fan. And the amount of combustion air to the burner body 1 is increased. When the fuel gas amount is changed in this way, the air-fuel ratio is set so that the fuel gas amount is always larger than the combustion air amount, and then the air-fuel ratio is controlled to the stoichiometric combustion air amount. . Therefore, blow-out at the time of changing the fuel gas amount can be prevented, and a mechanism for changing the opening area of the air passage 31 becomes unnecessary, and the configuration can be simplified.
[0036]
(Example 3)
Third Embodiment A third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a sectional view of a cooker using the combustion device of the present embodiment. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.
[0037]
In FIG. 6, a cooking device 40 is provided with a combustion device 21 according to the first embodiment in a baking cabinet 42 in which an object to be heated 41 is stored, and the burner 14 of the combustion device 21 is placed above the baking cabinet 42 with the combustion surface 12 facing downward. It is provided for.
[0038]
Next, an operation and an operation will be described. The burner 14 burns at an air-fuel ratio close to the stoichiometric combustion air amount by the operation of the combustion device 21, and the burner 14 is capable of rapidly rising red heat and performing stable combustion in a wide combustion amount variable range. Therefore, not only can the object to be heated 41 immediately below the ignition stage be efficiently baked and cooked, but also it is possible to keep the temperature at a low combustion amount, which has been difficult in the past, and thus it is possible to perform a wide range of heating and cooking.
[0039]
(Example 4)
Embodiment 4 Embodiment 4 of the present invention will be described with reference to the drawings. FIG. 7 is a sectional view of another cooker using the burner of the present embodiment. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.
[0040]
In FIG. 7, a cooking device 50 is provided with a combustion device 21 according to the first embodiment in a baking cabinet 52 containing an object to be heated 51, and the burner 14 of the combustion device is placed above the baking cabinet 52 with the combustion surface 12 facing downward. The agitating blade 54 connected to the blowing means 15 from the partition wall 53 behind the firing chamber 52 faces the firing chamber 52.
[0041]
Next, the operation and function will be described. The burner 14 emits high-temperature radiant heat and exhaust heat into the firing chamber 52. At this time, since the stirring blades 54 are directly connected to the air blowing means 15, the stirring blades 54 rotate at the same time to stir the hot air in the firing chamber 52, thereby making the temperature distribution in the firing chamber 52 uniform. Therefore, even if the lower heating means does not exist in the firing chamber 52, the object to be heated 51 is uniformly fired and cooked from the entire surface. Therefore, a large effective cooking volume in the firing chamber 52 can be ensured, so that even relatively large cooking can be cooked with a margin.
[0042]
【The invention's effect】
As described above, according to the combustion apparatus of the present invention, a high-temperature red-hot state can be instantaneously realized on the combustion surface of the burner, and a burner that can prevent the occurrence of blowout and flashback even when the amount of combustion is changed can be realized. . In addition, by using this combustion device in a cooker, it is possible to provide a cooker capable of performing a wide range of heating cooking from efficient baking cooking to keeping heat in a refrigerator, which has been extremely difficult in the past.
[Brief description of the drawings]
1 is a configuration diagram of a combustion device according to a first embodiment of the present invention; FIG. 2 is a front view of a burner in the combustion device according to the first embodiment of the present invention; FIG. FIG. 4 is a partially enlarged view of a fiber aggregate of fine metal wires. FIG. 4 is a partially enlarged view of a ceramic fiber aggregate of a burner combustion body in the first embodiment of the present invention. FIG. 5 is a configuration of a combustion apparatus in a second embodiment of the present invention. Fig. 6 is a sectional view of a cooker according to a third embodiment of the present invention. Fig. 7 is a sectional view of a cooker according to a fourth embodiment of the present invention. Fig. 8 is a front view of a burner in a conventional combustion device. ]
Reference Signs List 1 Burner main body 4 Burner 5 Oxide film 6 Fine metal wire 7 Fine metal wire fiber assembly 8 Ceramics 9 Ceramic fiber aggregate 12, 31 Burning surface 13 Non-burning area 14 Burner 15 Blower means 16, 31 Blower path 17 Fuel gas amount Adjusting means 20, 32 Ventilation control means 21, 30 Combustion device 40, 50 Cooker 42, 52 Firing chamber 54 Stirrer blade

Claims (10)

A burner in which a plate-like combustion body made of a thin metal wire or a fiber assembly of ceramics is housed in a burner main body, air blowing means connected to the burner main body through an air passage, and fuel gas amount adjusting means connected to the burner main body. A combustion device comprising: a control unit for controlling the amount of fuel gas; 2. The combustion device according to claim 1, wherein the air blowing control means changes an opening area in the air blowing path in conjunction with the fuel gas amount adjusting means. 2. The combustion device according to claim 1, wherein the blower control means changes the output to the blower means in conjunction with the fuel gas amount adjusting means. The blower control means according to claim 1, wherein when the fuel gas amount is reduced, the blower control means is operated earlier than the fuel gas amount adjuster, and when the fuel gas amount is increased, the blower control means is operated later than the fuel gas amount adjuster. A combustion device according to any one of the preceding claims. 2. The combustion apparatus according to claim 1, wherein the combustion body is formed by compressing and solidifying a thin metal wire or a fiber assembly of ceramics into a plate shape. 2. The combustion body according to claim 1, wherein an aggregate of thin metal wires made of a heat-resistant and corrosion-resistant steel mainly containing Fe and Cr is sintered to form an oxide film having a gray-black or black-blue color on the surface of the thin metal wires. Or the combustion device according to 5. Oxide _film, according to _{Al 2 O 3, SiO 2,} FeO, Fe 3 O 4, Fe 2 O 3, Cr 2 O 3, claim 6 and a compound selected components from among the metal oxide _NiO Combustion equipment. The burner according to claim 1, wherein the burner includes a compound selected from ceramics of Al ₂ O ₃ , SiO ₂ , SiC, and Si ₃ N ₄ . A cooker comprising the combustion device according to any one of claims 1 to 8, wherein the cooker is provided at an upper part of a baking oven with a burner directed downward. A cooker provided with the combustion device according to any one of claims 1 to 8, wherein a burner is provided downward at an upper portion of the baking oven, and a stirring blade connected to a blowing means is provided in the baking oven.

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