JP2002039513A - Gas burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas burner of improved heat efficiency, which can be reduced with polluting substance in exhaust gas and can be used by easily mounting to be heated object. SOLUTION: The gas burner is arranged with a jetting body provided with multiple jetting nozzles on the downstream side of the flames of a premixed forced combustion burner, heats the to be heated object by a high temperature jet exhaust gas and the jetting body is detachably constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for gasifying or burning a gas fuel or a liquid fuel and burning the gas fuel or the liquid fuel. The present invention relates to a technique capable of suppressing generation of nitrogen oxides in exhaust gas.

[0002]

2. Description of the Related Art Conventionally, a gas burner of this type uses a Bunsen type burner, as represented by a gas stove, which completely burns using primary air and secondary air for combustion, and uses a flame and combustion exhaust gas mixed in the flame. Generally, an object to be heated such as a pan is heated, but the heat utilization efficiency at that time is as low as 40% or more in the case of pan heating. On the other hand, there has long been a premixed combustion method in which all of the air required for combustion is premixed with gaseous fuel and no secondary air is required.In recent years, high-temperature exhaust gas from combustion flames caused by premixed combustion has been blown by a blower. Means for injecting through an ejector and colliding with a surface to be heated to obtain a high heat transfer effect has also been invented. In such a high-temperature exhaust gas injection type premixed combustion device, the combustion device, the object to be heated, and the surface to be heated are formed integrally or in a correlated shape. It was not suitable for heating a heated object.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the object to be heated can be easily placed in order to reduce the efficiency of the combustion device using the Bunsen-type burner and to eliminate the disadvantages in the premix combustion device. It is an object of the present invention to provide a configuration means of the entire combustion apparatus capable of coping with spills and dirt of boiling juice during pan heating and the like, and to realize a gas combustion heating apparatus with high efficiency and low pollution in a relatively simple form. is there.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 mixes almost all of combustion air required for gas combustion with gas fuel, and uses a blower to send the mixed gas to a burner. In a premixed forced-combustion gas combustion device that supplies and burns, the burner burner has a shape in which a number of small holes or narrow grooves or a combination of small holes and fine grooves is formed, and the high-temperature exhaust gas burned in the burner port is supplied to the burner. The space provided between the burner and the ejector maintains the ejection pressure so that the ejector having a large number of ejection ports provided separately from the burner on the downstream side can discharge at a high speed, and the combustion exhaust gas is discharged from other than the ejection port. The configuration is such that there is almost no leakage to the outside air. In this space, a suitable baffle plate is provided as necessary so that condensed water generated on the bottom surface of the object to be heated such as a pan or a liquid due to spillage does not directly hit the burner, and a control device for controlling combustion is provided. The connected air-fuel ratio control sensor, various safety sensors, and the ignition electrode are housed. The ejector is made of a heat-resistant material such as metal or ceramics, and is configured such that it can be easily attached and detached without losing the required airtightness of the space at the time of attachment. .

According to a second aspect of the present invention, the amount of fuel gas supplied to the mixing section with air is controlled by a gas proportional solenoid valve or a plurality of gas solenoid valves which are electrically controlled, while the combustion air is In a device that is supplied to a mixing pipe from a blower driven by a motor and the obtained mixed gas is sent to a burner and burns, the calorific value of this combustion device is reduced to, for example, about 1/5 of the rated value. An electronic control device is provided which can change the number of revolutions of the blower or the inlet area of the blower in conjunction with the fuel supply amount so as to be able to perform the above.

According to a third aspect of the present invention, in the first aspect of the present invention, the ejector is disposed at a position deviated from a vertical projection position of the ejector so that a liquid such as water from the burner ejector is not directly applied. The gas combustion device according to claim 1 or 2, wherein the baffle plate in the space can be omitted, and the flame of the burner is formed in a substantially horizontal direction.

According to a fourth aspect of the present invention, the main elements constituting the combustion device are housed in a box for housing the same, and the upper surface of the box is open to the peripheral portion of the ejector and is lower than the ejector. Provide a juice receiving section with a larger area than the ejector having a bottom for storing water at the position, and even if a heated object such as a pan or a kettle is placed, the exhaust from the ejector collides with the heated object. A structure in which a gap is formed between the ejection body and the object to be heated and between the upper surface of the box body and the object to be heated so that the object is released into the outside air after performing the heating operation sufficiently. This is for the gas combustion device shown in FIG.

According to a fifth aspect of the present invention, the ejector is made of a metal material having good heat conductivity, and is formed into a form which is in partial contact with the heat absorbing surface of the object to be heated. The gas combustion device according to any one of claims 1 to 4, wherein an outlet is not provided.

According to a sixth aspect of the present invention, the jet body has a through hole in which a temperature sensor for detecting a surface temperature of an object to be heated, such as a pan, is provided substantially at the center. A gas combustion apparatus according to claims 1 to 5 described above.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first embodiment of the present invention, in FIG. 1 showing one embodiment of the present invention, a combustion gas is supplied to a gas controller (not shown) through a gas controller (not shown) for controlling a gas pressure and a supply amount. The gas is supplied from the introduction pipe 1 to the mixing pipe 2 for combustion air, mixed with the air from the blower 3, and
Through the space having the pressure. The burner has a large number of small holes or small grooves or a flame port combining small holes and small grooves. The gas mixture ejected from this flame port is ignited by a spark from the ignition electrode 6 to form a flame 7.

At this time, the amount of combustion air is controlled by providing, for example, an electronic control unit 10 which operates according to a signal from an air-fuel ratio control sensor 8 so that the flame 7 becomes a predetermined combustion state with a relatively short flame. However, a baffle plate 12 is provided in the space 11 formed by the burner and the ejector 9 to improve the distribution of high-temperature exhaust air from the many outlets 13 present in the ejector 9 and adhere to an object to be heated during heating. The condensed water and the spilled water in the exhaust gas do not directly hit the burner. In some cases, sensors (not shown) for a misfire detection safety device and a flashback safety device are provided in the vicinity of the burner 5, and these sensors are normally operated by the electronic control device.

The space 11 composed of the burner and the ejector is combined with a member having an airtight structure in which the exhaust from the space 11 hardly leaks to the outside air portion other than the ejection port, and the air pressure of the blower and the form of the passage are exhausted. Is configured to maintain the ejection pressure at a predetermined value. Therefore, the high-temperature exhaust 24
Is spouted from the spout at high speed to break the adiabatic boundary film present on the surface of the object to be heated, thereby improving heat transfer to the object to be heated. It is desirable that the burner and the ejector be made of a heat-resistant material such as ceramics or metal, and that the burner storage box and the above-mentioned space be covered with a suitable heat insulating material 14 in order to prevent heat loss and prevent overheating of the periphery.

In the above combustion-related apparatus, the structure of each member and the related dimensions are set so that the ejecting body 9 can be easily attached and detached without impairing the airtightness of the space at the time of mounting. By adopting such a configuration that the ejector can be easily attached and detached, when applying this combustion device to a heating device such as a cooking stove or a rice cooker, cleaning of the ejector from contamination caused by boiling and dust naturally occurring. And the performance can be maintained for a long period of time.

The object to be heated can be any form of pot, pot,
Since the kettle and the like can be freely placed and used, there is no need to equip the object to be heated with a heat exchanger, and a highly versatile combustion device can be provided. Also, for the shape of a special heated portion such as a wok, for example, since the ejector is detachable from the combustion portion, the shape of the ejector is adjusted to the shape of the heated portion, It is also possible to prepare various jetting bodies in advance so that they can be mounted as needed. In the structure of the present invention, since the combustion is completed in a short time without the flame touching the outside air during the combustion,
Since the generation of harmful nitrogen oxides is extremely small and the heat transfer to the object to be heated is good, the heat utilization efficiency is greatly improved.

A second aspect of the present invention relates to a supply of fuel gas and a control of supply of combustion air by a blower.
The gas solenoid valve, the motor for the blower, the damper for changing the inlet area, etc., which are arranged as an actuator, are controlled so as to meet the optimum necessary conditions. Even if the amount is reduced to about 1/5 of the rated value, it can immediately cope with a change in the required heating amount, such as complete combustion.

Referring to FIG. 2, the burner 5 'is arranged at a position deviating from the vertical projection position of the ejector 9 so that condensed water or spill water from exhaust gas dripping through the ejector 9 is removed. It relates to a configuration that does not directly hit the burner, and the flame of the burner is formed in a substantially horizontal direction. Therefore, in this configuration, the baffle plate 12 may be omitted. It is effective when applied to a heating device such as a gas stove. In the figure, reference numeral 14 'denotes a heat insulating material for preventing heat loss and surrounding overheating, and is provided as needed.

The invention according to claim 4 relates to a means mainly applied to a cooking appliance typified by a stove for heating an object to be heated such as a kettle, a pan and a frying pan. Referring to FIG. 2, main elements such as a gas introduction pipe 1, a mixing pipe 2, a blower 3, a burner 5 ', a heat insulating material 14', an ejector holder 15 forming a space 11, and an electronic control device 10 which constitute a combustion device. Is housed in a box 16, and the upper surface of the box has an opening that fits into the peripheral edge of the ejector, and has a bottom for storing water at a lower position than the ejector. The juice receiving portion 17 having a large area is provided. Furthermore, a distance piece 18 is provided so that the object to be heated can be stably mounted while securing a passage for exhaust air even when the object to be heated is placed. In addition, it is desirable to provide a small hole in the juice receiving portion for preventing overflow when a large amount of water enters.

FIGS. 3 and 4 are a plan view and an elevation view, respectively, showing an embodiment for enhancing the effects of the present invention and making it easier to use the ejector which is one of the elements of the present invention. As shown in Item 5, a jet body is made of a metal material having good heat conduction, and the jet body has appropriately shaped protrusions 19 and 19 'that partially contact the heat absorbing surface of the object to be heated. age,
No spout is provided at a portion of the projection that contacts the heat absorbing surface of the object to be heated. The invention can utilize heat conduction heating from the high-temperature ejection body itself in conjunction with exhaust gas heating from the ejection port 13, and can also prevent overheating of the ejection body and contribute to improvement in durability. Exhaust gas is ejected from a large number of ejection ports 13 provided in portions other than the projections, and is discharged to the outside after heating the object to be heated.

FIG. 5 and FIG. 6 show that the present invention is effective when a temperature sensor for contacting with a heat absorbing surface of an object to be heated and detecting its temperature is provided in a cooking appliance such as a stove. FIG. The ejector has a through hole 20 at the center, and a body (not shown) of a temperature sensor is installed inside or through the ejector holder 15 in the overall configuration of the combustion device shown in FIG. Is enabled to contact only the object to be heated such as a pot or a kettle. Needless to say, the body of the temperature sensor is exposed to high-temperature exhaust gas, so that a predetermined heat-insulating process is performed.

Reference numeral 21 shown in FIGS. 1 and 2 is an operating device, and reference numeral 22 is a mixer for further improving the mixing of the combustion gas and air, which is provided as necessary. Reference numeral 23 denotes a pot as an example of an object to be heated by using the combustion apparatus of the present invention.

The embodiments of the present invention are not limited to those shown and described in the above embodiments, and various embodiments exist within the scope of the concept of the invention. For example, the gas introduction pipe 1 can be provided not to be opened downstream of the blower but to face the air intake of the blower, and there is a case where the distribution rectifying plate 4 is not required. Further, in FIG. 2, a plate material similar to the baffle plate 12 for improving the distribution of the jet flow may be provided in the space 11. Further, various embodiments can be considered on the premise that the shape of the ejector can be attached to and detached from the combustion part.

[0022]

The present invention is embodied in the above-described configuration and produces the following effects.

The high-temperature combustion exhaust gas collides with the heat-absorbing surface of the object to be heated at a high speed from a large number of ejection ports of the ejection body, so that the heat transfer coefficient is greatly improved, and the pot and the kettle, which had conventionally had relatively low heat utilization efficiency, Even when used for heating a rice cooker or the like that does not have a complicated heat exchange unit itself, useful cooking appliances such as cookers and rice cookers with high thermal efficiency can be obtained. Further, it is possible to suppress nitrogen oxides in the exhaust gas to １ ／ or less of the conventional Bunsen burner.

In addition to being usable in a state where the combustion device main body and the object to be heated are separated, a liquid (water) dropped from the upper portion of the combustion device is used.
Can prevent adverse effects on flammability, durability and the like. In addition, it is an invention which is extremely effective in use because it can be removed and cleaned without impairing the performance of the ejector body.

In addition, the control of the amount of combustion heat can be easily controlled by using an electronic method. Since the flame does not come into direct contact with the object to be heated, the user of the device is less likely to be exposed to the radiant heat of the flame and less likely to catch fire. It has a number of effects that could not be achieved with the prior art.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a partial cross section showing one embodiment.

FIG. 2 is a configuration diagram of a partial cross section showing another embodiment.

FIG. 3 is a plan view showing an effective embodiment of an ejector which is a main element of the present invention.

FIG. 4 is an elevational view showing a cross section of an effective embodiment of the ejector.

FIG. 5 is a plan view showing another embodiment of the ejection body.

FIG. 6 is an elevation view showing a cross section of another example of the ejection body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas introduction pipe 2 Mixing pipe 3 Blower 4 Distribution rectifier plate 5, 5 'burner 6 Ignition electrode 7 Flame 8 Air-fuel ratio control sensor 9 Ejector 10 Electronic control device 11 Space 12 Baffle plate 13 Spout port 14, 14' Insulation material DESCRIPTION OF SYMBOLS 15 Ejector holder 16 Box 17 Juice receiving part 18 Distance piece 19, 19 'Projection part 20 Through-hole 21 Actuating operation device 22 Mixer 23 Heated object (pan) 24 High temperature exhaust

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F24C 3/12 F24C 3/12 G

Claims (6)

[Claims] In a premixed forced-combustion type gas combustion apparatus in which almost all of combustion air required for gas combustion is mixed with gas fuel and this mixed gas is supplied to a burner using a blower and burned, a flame of the burner is used. The mouth has a shape composed of a number of small holes or small grooves or a combination of small holes and small grooves, and the high-temperature exhaust gas burned at the flame outlet is discharged from an ejector having a large number of injection ports provided separately from the burner downstream of the burner. The space provided between the burner and the ejector maintains the ejection pressure so that the exhaust gas can be ejected at a high speed, and the combustion exhaust gas is configured to hardly leak to the outside air other than the ejection port. In this space, an appropriate baffle plate is provided as necessary so that condensed water generated on the bottom surface of the object to be heated such as a pan and liquid caused by spillage do not directly hit the burner, and a control device for controlling combustion is provided. The connected air-fuel ratio control sensor, various safety sensors, and the ignition electrode are housed. A gas combustion device, wherein the ejector is made of a heat-resistant material such as metal or ceramics, and is configured to be easily attached and detached without losing the required airtightness of the space at the time of attachment. . The amount of fuel gas supplied to the mixing section with air is controlled by an electrically controlled gas proportional solenoid valve or a plurality of gas solenoid valves, while the combustion air is driven by a motor. In a device that is supplied from a blower to a mixing pipe and the obtained mixed gas is sent to a burner and burns, the calorific value of the combustion device is reduced to, for example, 1/5 of the rated value.
2. An electronic control device capable of changing a rotation speed of a blower or an inlet area of the blower in conjunction with a fuel supply amount so as to be able to throttle down to a degree.
A gas combustion device shown in FIG. 3. The burner according to claim 1, wherein the burner is disposed at a position deviated from a vertical projection position of the ejector so as to prevent liquid such as water from the ejector from directly splashing. 3. The gas combustion apparatus according to claim 1, wherein the baffle plate can be omitted, and the flame of the burner is formed in a substantially horizontal direction. 4. A main element constituting the combustion device is housed in a box housing the same, and the upper surface of the box is opened at a peripheral portion of the ejector and stores water at a position lower than the ejector. Even if a juice receiving part with an area larger than the ejector having a bottom is provided, and even if an object to be heated such as a pan or a kettle is placed, the exhaust from the ejector collides with the object to be heated, and a sufficient heating effect is obtained. The gas combustion according to any one of claims 1 to 3, wherein a gap is formed between the ejection body and the object to be heated and between the upper surface of the box body and the object to be heated so as to be released to the outside air after the operation. apparatus. 5. The jet body is made of a metal material having good heat conductivity and is formed so as to be in partial contact with a heat absorbing surface of an object to be heated, and a jet port is not provided at the contact portion. The gas combustion apparatus according to any one of claims 1 to 4, wherein 6. The ejector according to claim 1, wherein a through-hole is provided substantially at the center of the ejector so that a temperature sensor for detecting a surface temperature of the object to be heated can be attached. 5. The gas combustion device shown in 5.