JP2009079823A - Cooking stove burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooking stove burner with improved combustion performance and thermal efficiency by increasing the quantity of secondary air. <P>SOLUTION: The cooking stove burner 5 consists of a burner body 20 and a burner head 22. A guide cylinder 30 communicating to the center opening of the burner body 20 is connected to the lower part of the burner body 20. The secondary air required for combustion of the cooking stove burner 5 flows inside the guide cylinder 30. An electric heater 35 which warms up the air inside the guide cylinder 30 is provided near the lower end inside the guide cylinder 30. Since the air passing the lower side of the guide cylinder 30 is warmed up by the electric heater 35, the draft force of the secondary air flowing through the guide cylinder 30 is strengthened. Thereby, since the quantity of the secondary air can be increased sharply, the combustion performance of the cooking stove burner 5 can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stove burner, and more particularly to a stove burner that draws in secondary air and maintains good flammability when a flame is formed at a flame outlet and burned.

  In a conventional gas stove, a burner is disposed at the center position of an opening provided in the top plate, and a soup pan is placed around the burner. The cooking pan is placed on the five virtues provided above the burner and is heated by the burning of the burner. The five virtues are integrally configured by a plurality of virtuosity claw for placing the cooking pot and a virtuosity ring as a base of each virtuosity nail, and are placed on the top plate. The burner is composed of a burner main body having an opening formed at the center and a burner head that is placed on the burner main body to form a number of main flame openings on the outer peripheral edge. In this type of gas stove, the secondary air required for burning the burner is introduced through the opening at the center of the burner head, the gap between the cooking pan and the Gotoku ring, the gap between the Gotoku ring and the soup pan, etc. .

However, the secondary air introduced from the gap between the Gotoku ring and the juice tray only hits the tip of the flame formed at the main flame outlet. Therefore, there was a problem that sufficient secondary air could not be supplied to the flame. Therefore, by extending the tip of the heel of the virtues downward toward the center of the ring so that it is located within 30 mm at a horizontal distance from the outer peripheral surface of the main flame opening of the burner head, the secondary air is introduced into the base of the flame. A gas stove that can be supplied from the top to the tip is known (see, for example, Patent Document 1).
JP 2003-161449 A

  However, in the gas stove described in Patent Document 1, when the cooking pan is placed in the five virtue, the space around the burner head is narrowed by the pan bottom, so the secondary air necessary for combustion cannot be sufficiently supplemented. There was a problem. In order to improve the deterioration of combustion, usually, a method such as increasing the combustion space by increasing the distance from the pan or increasing the distance to the bottom of the pan by laying the burner head flame is used. However, the thermal efficiency is not preferable.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a stove burner that can improve combustion performance and thermal efficiency by increasing the amount of secondary air.

  In order to achieve the above object, a stove burner according to a first aspect of the present invention includes a cylindrical burner body and an annular burner that is attached to the burner body and forms a plurality of flame openings in the circumferential direction of the outer peripheral surface. A head, a secondary air supply passage for supplying secondary air from below toward the opening formed in the center of the burner body, and the secondary air supply passage provided in the secondary air supply passage. Heating means for heating the passing secondary air.

  Moreover, the stove burner of the invention which concerns on Claim 2 is the structure of the invention of Claim 1, and the said heating means is an electric heater.

  In addition to the configuration of the invention according to claim 1 or 2, the stove burner of the invention according to claim 3 is a cylinder that communicates with the opening and extends downward in the lower part of the burner body. A body is provided, the secondary air supply passage is formed inside the cylinder, and the heating means is provided below the cylinder.

  In the stove burner according to the first aspect of the present invention, when a flame is formed at the plurality of flame openings and burns, the secondary air is drawn from the opening of the burner body through the secondary air supply passage. Since the air in the secondary air supply passage is heated by the heating means and rises, the amount of secondary air supplied to the flame can be increased. Therefore, the combustion performance of the stove burner can be improved and the thermal efficiency can be improved. Furthermore, since the heated secondary air can be supplied to the flame, it is possible to prevent a drop in the temperature of the flame.

  Further, in the stove burner of the invention according to claim 2, in addition to the effect of the invention of claim 1, since the heating means is an electric heater, the fire formed in the flame opening is not ignited and is safe. .

  In addition, in the stove burner of the invention according to claim 3, in addition to the effect of the invention of claim 1 or 2, since the cylindrical body communicating with the opening is provided at the lower part of the burner body, the inside of the cylindrical body is provided. A secondary air supply passage isolated from the outside can be formed. Further, since the cylinder is extended downward and the heating means is provided on the lower side, the air warmed in the cylinder can be raised as it is, and can be quickly supplied to the burner body as secondary air.

  Hereinafter, the stove burner 5 which is one Embodiment of this invention is demonstrated with reference to drawings. FIG. 1 is a perspective view of the table stove 1, FIG. 2 is a cross-sectional view of the stove burner 5, and FIG. 3 is a table showing the results of the evaluation test of the stove burner. A table stove 1 shown in FIG. 1 is a gas heating cooker provided with a stove burner 5 according to the present invention.

  First, the structure of the table stove 1 will be described. As shown in FIG. 1, the table stove 1 includes a substantially rectangular parallelepiped instrument 2. A top plate 3 is provided on the top surface of the instrument 2. On the left and right sides of the top plate 3, openings 4 and 4 (see FIG. 2) each having a circular shape in plan view are provided. Bunsen type burner burners 5 and 6 are respectively provided in the openings 4 and 4. A rectangular grill exhaust port (not shown) that is horizontally long in plan view is provided on the side between the openings 4 and 4. An exhaust cover 7 having a plurality of exhaust holes 7a is provided at the grill exhaust port.

  And in the clearance gap between the inner periphery of the opening 4 and the circumference | surroundings of the stove burners 5 and 6, the soup saucer 18 (refer FIG. 2: only the soup saucer 18 by the side of the stove burner 5 is shown) is each installed. Above the stove burners 5 and 6, virtues 8 and 9 for placing the cooking pot P (see FIG. 2) are respectively installed. The virtues 8 are integrally formed by a virtuosity ring 8a that covers a portion where the opening 4 of the top plate 3 and the juice receiving tray 18 overlap with each other, and a plurality of L-shaped martial claws 8b that are erected on the top of the virtuosity ring 8a. It is configured. Similarly to the virtues 8, the virtues 9 are integrally constituted by the virtuosity ring 9a and the virtuosity claw 9b.

  In addition, a grill 12 for heating an object to be cooked such as fish is provided at the center of the appliance 2. In the center of the front of the appliance 2, a grill handle 12a is provided to project forward from the inside of the grill 12 (not shown) of the grill 12 to draw out the grill (not shown) placed on the tray (not shown). Yes. An ignition button 15 for igniting the stove burner 5 is provided on the front right side of the appliance 2. On the left side, an ignition button 17 is provided for igniting a grill burner (not shown) provided in the grill compartment of the grill 12. An ignition button 16 for igniting the stove burner 6 is provided on the left side of the grill handle 12a. On the left side of the ignition button 16, a battery box 19 for storing a dry battery as a power source is provided.

  Further, a heating power adjusting lever 15a for manually adjusting the heating power of the stove burner 5 is provided immediately above the ignition button 15 so as to be movable in the left-right direction. Immediately above the ignition button 16, a heating power adjusting lever 16a for manually adjusting the heating power of the stove burner 6 is provided so as to be movable in the left-right direction. A heating power adjusting lever 17a for manually adjusting the heating power of the grill burner is provided immediately above the ignition button 17 so as to be movable in the left-right direction.

  Next, the structure of the stove burner 5 will be described. Since the stove burners 5 and 6 have the same structure, only the stove burner 5 will be described here, and the description of the stove burner 6 will be omitted. As shown in FIG. 2, the stove burner 5 is mounted on a cylindrical burner body 20 having an annular mixing chamber 21 with an opening formed in the center, and placed on the upper part of the burner body 20. It comprises an annular burner head 22 that forms a number of flame openings 22a on the outer periphery. One end portion of a supply pipe 24 that supplies a mixed gas of gas and primary air to the mixing chamber 21 is connected to the lower portion of the side surface of the burner body 20. The other end portion of the supply pipe 24 is provided with a hollow substantially conical connection portion 25 whose diameter is increased upstream in the direction in which the mixed gas flows. An injection nozzle 26 for injecting gas is fitted into the connection portion 25. The injection nozzle 26 is provided in an adjustment unit (not shown) that adjusts the gas amount by operating the heating power adjustment lever 15a.

  Further, a plurality of suction holes 25 a for drawing primary air into the supply pipe 24 are provided around the injection nozzle 26 in the connection portion 25. In such a structure, when gas is ejected from the injection nozzle 26 toward the supply pipe 24, the primary air is drawn into the supply pipe 24 from the suction hole 25a with the momentum of the gas ejection. As a result, the gas and the primary air are mixed to form a mixed gas that flows through the supply pipe 24 and is supplied into the mixing chamber 21 of the burner body 20. When the mixed gas is supplied to the flame port 22a of the burner head 22, it is ignited by an igniter (not shown) provided in the vicinity of the burner head 22, and a flame is formed at the flame port 22a.

  Incidentally, the lower part of the burner body 20 is connected to an introduction cylinder 30 that communicates with the central opening of the burner body 20 and extends in the vertical direction. Inside the introduction cylinder 30, secondary air required when the stove burner 5 is combusted flows. An electric heater 35 that warms the air inside the introduction cylinder 30 is supported near the lower end portion inside the introduction cylinder 30. Various methods for supporting the electric heater 35 are conceivable. For example, a support member (not shown) may be fixed to the bottom surface of the instrument 2, the electric heater 35 may be attached to the upper end portion of the support member, and inserted from below the introduction cylinder 30 to be supported. Alternatively, a support member may be attached to the inner surface of the introduction cylinder 30 and the electric heater 35 may be attached to the support member for support.

  The electric heater 35 is preferably arranged at the center inside the introduction cylinder 30. This is because the air surrounding the electric heater 35 can be uniformly heated. Furthermore, it is preferable to arrange the electric heater 35 along the direction in which air flows. This is because the air can be heated without obstructing the air flow by the electric heater 35. By using the introduction cylinder 30 and the electric heater 35, the amount of secondary air introduced from the secondary air supply passage A described later can be significantly increased. The electric heater 35 shown in FIG. 2 corresponds to the “heating means” of the present invention.

  Next, the secondary air supply passages A and B in the stove burner 5 will be described. As shown in FIG. 2, the secondary air necessary for the combustion of the stove burner 5 is mainly introduced from the two passages of the secondary air supply passages A and B. The secondary air supply passage A is a passage that passes through the inside of the introduction cylinder 30, the central opening of the burner body 20, and the central opening of the burner head 22. On the other hand, the secondary air supply passage B is a passage that passes from the periphery of the virtues 8 through a gap formed between the virtuosity ring 8 a, the top plate 3, and the juice tray 18.

  For example, when a flame formed in the flame port 22a of the burner head 22 burns, outside air is drawn into the secondary air supply passages A and B, respectively, and introduced as secondary air to the flame of the flame port 22a. Here, in the secondary air supply passage A, the outside air is drawn into the lower side of the introduction cylinder 30 and rises. However, since the air passing through the lower side of the introduction cylinder 30 is heated by the electric heater 35, The draft force of the secondary air flowing through the introduction cylinder 30 is increased. Thereby, since the quantity of the secondary air introduce | transduced from the secondary air supply channel | path A can be increased significantly, the combustion performance of the stove burner 5 can be improved.

  Furthermore, since the amount of secondary air can be increased, for example, the distance between the bottom of the cooking pan P and the burner head 22 can be reduced. Thereby, the thermal efficiency of the stove burner 5 can be improved. Further, the flame tip 22 a of the burner head 22 may be raised to bring the tip of the flame closer to the center of the bottom of the cooking pan P. Thereby, the thermal efficiency of the stove burner 5 can be further improved. Furthermore, since the secondary air passing through the secondary air supply passage A is heated by the electric heater 35, the temperature of the flame is not lowered. Thereby, the thermal efficiency of the stove burner 5 can be further improved.

  On the other hand, in the secondary air supply passage B, the inner peripheral edge of the virtually ring 8a extends to the vicinity of the flame opening 22a of the burner head 22, so that the secondary air passing through the secondary air supply passage B is not flame. Supplied throughout from base to tip. Thereby, the combustion performance of the stove burner 5 further improves.

  Next, an evaluation test of the stove burner 5 according to this embodiment will be described. In the test, three types of samples A, B, and C were used to evaluate the stove burner. Sample A is a conventional stove burner as Comparative Example 1 in which the burner body has no introduction cylinder and the distance between the upper part of the burner head and the bottom of the cooking pan is set to 28 mm. Sample B is a stove burner as Comparative Example 2 in which the burner body has no introduction cylinder, and the distance between the upper part of the burner head and the bottom of the cooking pot is changed to 22 mm. Sample C is a product according to the present invention, in which an introduction cylinder is provided in the burner body, an electric heater is disposed in the introduction cylinder, and the distance between the upper part of the burner head and the bottom of the cooking pan is set to 22 mm. It is a burner. That is, it corresponds to the above-described stove burner 5. The electric heater used was 24 W.

  Next, the evaluation method will be described. Evaluation was judged on five items. In evaluation item 1, the time (sec) required for the temperature rise of about 50 ° C. and the amount of gas consumed (L) were measured and evaluated in a state where a predetermined amount of water was stored in the cooking pan. In evaluation item 2, the gas input (Kcal / h) and the output (Kcal / h) in the instrument were obtained, and the thermal efficiency (%) of the stove burner was calculated and evaluated. The thermal efficiency is the ratio between the heat effectively used and the heat amount of the consumed gas.

Furthermore, in the evaluation item 3, the carbon monoxide production amount (CO) and the carbon dioxide production amount (CO ₂ ) per unit time were obtained, and the carbon monoxide production ratio (CO / CO ₂ ) was calculated and evaluated. . In evaluation item 4, the theoretical CO was calculated and evaluated. The theoretical CO is an index representing the degree of incomplete combustion, and is calculated by the following formula from the values of CO and CO ₂ detected in the combustion exhaust gas.
Theoretical CO = Measured CO (%) × (CO ₂ max (%) / Measured CO ₂ (%))
CO ₂ max is the concentration (%) of carbon dioxide generated when the fuel gas is completely burned at the theoretical air ratio (λ = 1). A smaller theoretical CO value indicates that less CO is generated and combustion performance is good.

  Note that Sample B is a sample in which the distance between the bottom of the cooking pot and the upper part of the burner head is narrowed with respect to Sample A, which is a conventional example. That is, since the amount of secondary air supplied to the flame is inevitably insufficient, the combustion performance and thermal efficiency of sample B are lower than that of sample A. Therefore, in this evaluation test, the sample B was evaluated only for the evaluation items 3 and 4.

  The result of the evaluation item 1 will be described. As shown in FIG. 3, it took 520 seconds to raise the temperature of the predetermined amount of water by 50 ° C. in Sample A, which is a conventional product. On the other hand, in sample C which is the product of the present invention, it took 490 seconds to raise the temperature of the predetermined amount of water by 51 ° C. That is, in Sample C, the time required to increase the temperature of the predetermined amount of water by about 50 ° C. was shortened by about 30 seconds compared to Sample A. Furthermore, the amount of gas consumed due to the temperature increase was 45 L in sample A, but 43 L in sample C, and the amount of gas consumed could be saved by about 2 L. In other words, the sample C of the present invention was able to heat a predetermined amount of water in a short time with a small amount of gas consumption compared to the sample A of the conventional product. Can be judged to have improved.

  The result of the evaluation item 2 will be described. As shown in FIG. 3, in the conventional sample A, the gas input was 3477 (Kcal / h) and the output was 1973 (Kcal / h). That is, the thermal efficiency was 57%. On the other hand, in the sample C which is the product of the present invention, the gas input was 3477 (Kcal / h) and the output was 2081 (Kcal / h). That is, the thermal efficiency was 60%. Therefore, the sample C which is the product of the present invention was able to increase the thermal efficiency by 3% compared to the sample A which is the conventional product.

The result of the evaluation item 3 will be described. As shown in FIG. 3, in the conventional sample A, the CO production amount was 0.0155 (%) and the CO ₂ production amount was 3.15 (%), so the CO production ratio was 0.004921. Met. In sample B, the CO production ratio was 0.009107 because the CO production quantity was 0.0255 (%) and the CO ₂ production quantity was 2.8 (%). On the other hand, in sample C which is the product of the present invention, the CO production ratio was 0.004561 because the CO production amount was 0.013 (%) and the CO ₂ production amount was 2.85 (%).

  In sample B, since the combustion space is narrower than in sample A, it is presumed that the amount of secondary air necessary for flame combustion is insufficient. Specifically, it is presumed that the amount of secondary air passing through the secondary air supply passage B described above has decreased, and it seems that the amount of CO generated has increased. In other words, the degree of incomplete combustion increased. Compared to such samples A and B, the CO production ratio in sample C, which is the product of the present invention, was significantly reduced. This is presumably because the decrease in the amount of secondary air passing through the secondary air supply passage B can be sufficiently supplemented by the amount of secondary air passing through the secondary air supply passage A. That is, it is considered that the draft force of the secondary air supply passage A is improved and sufficient secondary air can be supplied by heating the air inside the introduction cylinder with the electric heater.

  The result of the evaluation item 4 will be described. As shown in FIG. 3, the theoretical CO of Sample A, which is a conventional product, was 610 ppm, the theoretical CO of Sample B was 1130 ppm, and the theoretical CO of Sample C, which was the product of the present invention, was 560 ppm. In sample B, for the reasons described above, the amount of secondary air necessary for the combustion of the flame is insufficient in quantity, so that it is presumed that the degree of incomplete combustion is further increased with respect to sample A. Compared to such samples A and B, the theoretical CO of sample C, which is the product of the present invention, was significantly reduced. For this reason as well, it is considered that the draft force of the secondary air supply passage A was improved and sufficient secondary air could be supplied by heating the air inside the introduction cylinder with an electric heater.

From the above results, compared with the conventional product, the sample C which is the product of the present invention was able to improve both the combustion performance and the thermal efficiency of the stove burner. This is due to the fact that the draft force of the secondary air supply passage A is improved and sufficient secondary air can be supplied by heating the air inside the introduction cylinder with an electric heater. As a result, the combustion performance of the stove burner can be greatly improved, so that even when the pan bottom is lowered in order to improve the thermal efficiency, an excellent effect can be obtained in that the secondary air can be supplied without shortage. In addition, since the gas input is the same in the conventional product (sample A) and the product of the present invention (sample C), when the increase in gas output is converted into energy,
(2081-1973) /860×1000=15.2 (W)
It becomes. However, this value includes 24 (W) which is the electric power of the electric heater. Therefore, it was found that the product of the present invention can obtain the effect of electric power of 101.6 (W) obtained by subtracting 24 (W) from 125.6 (W) compared to the conventional product.

  As described above, the stove burner 5 of the present embodiment includes the burner body 20 and the annular burner head 22 placed on the burner body 20. An introduction cylinder 30 that communicates with the central opening of the burner body 20 is connected to the lower portion of the burner body 20. Inside the introduction cylinder 30, secondary air necessary for the combustion of the stove burner 5 flows. An electric heater 35 for heating the air inside the introduction cylinder 30 is provided in the vicinity of the lower end portion inside the introduction cylinder 30. Since the air passing under the introduction cylinder 30 is heated by the electric heater 35, the draft force of the secondary air flowing through the introduction cylinder 30 is increased. Thereby, since the quantity of secondary air can be increased significantly, the combustion performance of the stove burner 5 can be improved. Since the amount of secondary air can be increased, the distance between the bottom of the cooking pot P and the burner head 22 can be reduced. Thereby, the thermal efficiency of the stove burner 5 can be improved.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications are possible. In the above embodiment, the air flowing inside the introduction cylinder 30 is heated by the electric heater 35, but the inside of the introduction cylinder may be heated using burner combustion heat. For example, the air inside the introduction cylinder 30 can be heated by extending the heat pipe from the burner head to the lower side of the introduction cylinder 30 and conducting the burner combustion heat with the heat pipe. The heat pipe is a metal pipe having a capillary structure on the inner wall of the pipe. The inside is a vacuum and a small amount of water or alternative chlorofluorocarbon is enclosed. When one end of the heat pipe is brought into contact with a heat source and heated, the liquid inside is evaporated and vaporized, and at this time, heat is taken in as latent heat (heat of vaporization). And it moves to a low-temperature part at high speed, and is cooled there, returns to a liquid, and releases heat. Since the liquid returns to the original place through the capillary structure, heat can be transferred continuously and efficiently.

  The stove burner of the present invention can be applied to a Bunsen type stove burner, and can be used for a gas cooker such as a table stove or a built-in stove.

It is a perspective view of the table stove 1. FIG. It is sectional drawing of the stove burner 5. FIG. It is the table | surface which showed the result of the evaluation test of the stove burner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Table stove 2 Apparatus 5 Stove burner 20 Burner main body 22 Burner head 22a Flame outlet 30 Introduction cylinder 35 Electric heater A Secondary air supply path B Secondary air supply path

Claims (3)

A cylindrical burner body,
An annular burner head mounted on the burner body and forming a plurality of flame openings in the circumferential direction of the outer peripheral surface;
A secondary air supply passage for supplying secondary air from below toward the opening formed in the center of the burner body;
A heating burner comprising a heating means provided in the secondary air supply passage and for heating the secondary air passing through the secondary air supply passage.   The stove burner according to claim 1, wherein the heating means is an electric heater. The lower part of the burner body is provided with a cylindrical body that communicates with the opening and extends downward,
The secondary air supply passage is formed inside the cylinder,
The stove burner according to claim 1 or 2, wherein the heating means is provided below the cylindrical body.

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