JP2006029727A - Cooking stove burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooking stove burner capable of preventing uneven heating caused by strong or weak thermal power and improving heat efficiency. <P>SOLUTION: In an internal burner port concentric burner 10, a mixed gas is supplied into a second burner port 21 of a slave burner 18 to inject flame having the same primary air ratio as that of a first burner port 16 in a case of a weak thermal power side. Consequently, since flame injected from the second burner port 21 of the slave burner 18 is formed in the vicinity of substantially center of an opening part 4, the whole bottom of a cooking pan 29 is heated without causing unevenness. In a case of strong thermal power side, air blown from a forced fan 40 is supplied into the second burner port 21. Since oxygen concentration in a ringlike space part 23 is ensured, a combustion condition of flame injected from the first burner port 16 is improved, and combustion performance of the burner is improved. Since secondary air is supplied to the center of opening part 4 where tips of flame of the first burner port 16 come into contact, temperature in the vicinity of the center of the opening part 4 is dispersed around it. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stove burner, and more particularly to a stove burner that can prevent uneven heating caused by the strength of thermal power.

  Conventionally, a gas stove is provided with a stove burner, and various types are used. For example, an inward burner having an annular burner main body and a plurality of flame openings arranged in the circumferential direction of the inner peripheral surface thereof, or a substantially disc-shaped burner main body, and a plurality of flames in the circumferential direction of the outer peripheral surface thereof. Outward burners with mouths lined up are known. In the inward burner, flames are ejected from the respective flame openings arranged on the inner peripheral surface toward the center of the inner space. On the other hand, in the outward burner, a flame is ejected outward from each flame port arranged on the outer peripheral surface. In any of the burners, the cooking pot placed on the upper part of the five victories provided above the burner is heated by the flames ejected from each flame outlet. Recently, an internal flame burner parent / child burner has been developed which is constructed by combining the inward burner and the outward burner as described above in combination with each other.

For example, an annular parent burner (inward burner) having a flame opening on the inner peripheral surface, and a child burner (inner burner provided inside the parent burner and having a second flame outlet toward the inner peripheral surface of the parent burner) An internal burner parent-child burner having an outwardly facing burner) and a ring-shaped space portion formed on the inner peripheral surface of the parent burner and the outer peripheral surface of the child burner has been proposed (for example, see Patent Document 1). In this internal flamelet burner, flames injected from each flamelet collide in the ring-shaped space, the flame blows up toward the center of the bottom of the heated body, and further along the bottom surface of the heated body. By moving toward the outer periphery, the flame comes into substantially uniform contact with the entire bottom surface of the heated object, so that the heated object can be efficiently heated.
Japanese Patent Laid-Open No. 10-220715

  However, according to the internal flamelet parent-child burner described in Patent Document 1, when the heating power is set to the high heating power side, the injection distance of the flame injected from each flamelet becomes long, and the parent burner and the child burner Since each flame injected from each flame mouth collides and interferes with each other in the ring-shaped space portion, there is a problem that the thermal efficiency is deteriorated. In addition, since the oxygen concentration in the ring-shaped space where the flames contact and interfere with each other decreases, there is a problem that the combustion state at each flame port deteriorates. In addition, when the flame is concentrated at the center of the bottom of the heated body, the center of the bottom of the heated body is at a higher temperature than the surroundings, which causes problems such as uneven heating of the heated body.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stove burner capable of preventing uneven heating of a heated object caused by the strength of thermal power and improving thermal efficiency.

  In order to achieve the above object, the stove burner of the invention according to claim 1 includes an annular inward burner in which a plurality of flame openings are arranged in the circumferential direction of the inner peripheral surface, an inner side of the inward burner, And a stove burner provided coaxially with the inward burner and having an outward burner in which a plurality of flame outlets are arranged in the circumferential direction of the outer peripheral surface, the heating power of the inward burner being a strong heating power side When set to, only the secondary air or a gas mixture containing excess air is supplied to the flame outlet of the outward burner.

  In addition to the structure of the invention according to claim 1, the stove burner of the invention according to claim 2 has a flame of the outward burner when the inward burner is set to a low heating power side. The mouth is supplied with a mixed gas having an air ratio equivalent to a mixed gas composed of fuel gas and primary air supplied to the flame mouth of the inward burner.

  In addition to the configuration of the invention according to claim 1 or 2, the stove burner of the invention according to claim 3 includes a thermal power adjusting means for adjusting the thermal power of the inward burner from a strong thermal power to a low thermal power, A first supply pipe connected to the facing burner and supplying a mixed gas consisting of fuel gas and primary air to the flame outlet of the inward burner, and one end side connected to the outward burner, mixed gas or secondary air A second supply pipe that supplies only the flame outlet of the outward burner, a switching valve connected to the other end side opposite to the one end side of the second supply pipe, and one end to the switching valve A third supply pipe connected to the middle of the first supply pipe, a fourth supply pipe connected to the switching valve at one end side, Secondary air connected to the other end opposite to the one end of the fourth supply pipe A secondary air forced air blowing means for forcibly blowing air, and a switching valve opening / closing control means for controlling the opening / closing of the switching valve by the thermal power adjusted by the thermal power adjusting means, the thermal power adjusting means on the high thermal power side When adjusted, the switching valve control means supplies secondary air from the fourth supply pipe to the second supply pipe, and when the heating power adjustment means is adjusted to a low heating power side, the switching valve control means The valve control means controls the opening and closing of the switching valve so as to supply the gas mixture from the third supply pipe to the second supply pipe.

  A stove burner according to a fourth aspect of the invention includes a gas injection means for injecting a fuel gas into the fourth supply pipe, in addition to the configuration of the invention according to the third aspect. When the excess gas mixture gas is generated and the heating power adjusting means is adjusted to a strong heating power, the switching valve control means supplies the second supply pipe with the excess air gas from the fourth supply pipe. A mixed gas is supplied.

  In the stove burner according to the first aspect of the present invention, when the heating power is set to the strong heating power side and the flame is concentrated inside the inward burner, the secondary burner is directed from the flame outlet of the outward burner toward the inside of the inward burner. Since only air is supplied, it is possible to sufficiently supply the secondary air necessary for flame formation at the mouth of the inward burner. Therefore, since the oxygen concentration inside the inward burner can be sufficiently secured, the combustion state of the flame at each flame mouth can be maintained well. In addition, since the secondary air can be supplied to the combustion of the gas ejected from the flame port without insufficiency, incomplete combustion can be prevented. Therefore, it is not necessary to excessively increase the outer diameter of the inward burner in order to maintain a good combustion state, and a stove burner with high thermal efficiency and good heat distribution can be obtained. Furthermore, since only the secondary air can be supplied to the portion where the flame tip is concentrated, the temperature of the flame concentration portion that tends to become high temperature during strong heating can be dispersed and lowered. Therefore, it becomes a stove burner with good heat distribution, and heating unevenness generated in the heated object can be prevented. In addition, when an excess gas mixture is supplied to the inside of the inward burner, excess air that does not participate in the formation of flame that is ejected from the flame outlet of the outward burner is ejected from the flame outlet of the inward burner. It can be supplied as secondary air to the flame. Therefore, similarly to the case where only the secondary air is supplied, the combustion performance at the flame port of the inward burner can be improved.

  Further, in the stove burner of the invention according to claim 2, in addition to the effect of the invention of claim 1, when the heat power is set to the low heat power side, the tip of the flame reaches the inner center of the inward burner. However, although the temperature of the inner center is lowered, the mixed gas is supplied to the flame outlet of the outward burner, so that a Bunsen flame equivalent to the flame ejected from the flame burner of the inward burner can be formed. Therefore, since the temperature of the inner center portion of the inward burner, which is likely to decrease in temperature when the heating power is weak, can be increased, it is possible to prevent the occurrence of heating unevenness that occurs in the heated object.

  Further, in the stove burner of the invention according to claim 3, in addition to the effect of the invention of claim 1 or 2, when the thermal power adjusted by the thermal power adjusting means is adjusted to the strong thermal power side, the switching valve control means Controls the opening and closing of the switching valve so that only the secondary air flowing from the fourth supply pipe is supplied to the second supply pipe. Then, since the secondary air blown from the secondary air forced air blowing means is ejected from the flame outlet of the outward burner, supply sufficient secondary air necessary for the flame ejected from the flame outlet of the inward burner. Can do. Therefore, the oxygen concentration inside the inward burner can be sufficiently secured, so that the combustion state at each flame outlet can be made good without excessively increasing the outer diameter of the inward burner, and heat distribution with high thermal efficiency. A good burner. Furthermore, since only the secondary air can be supplied to the portion where the flame tip is concentrated, the temperature inside the inward burner, which tends to be high temperature, can be dispersed and lowered. On the other hand, when adjusted to the low heating power side, the switching valve control means controls opening and closing of the switching valve so as to supply the mixed gas flowing from the third supply pipe to the second supply pipe. Then, a part of the mixed gas flowing through the first supply pipe flows through the third supply pipe, and further flows through the second supply pipe via the switching valve and is supplied to the flame outlet of the outward burner. And, since each Bunsen flame is formed at each flame outlet of the outward burner to the same extent as the inward burner, it is possible to increase the temperature of the inner central portion of the inward burner where the temperature tends to decrease during low heat power. . Therefore, it is possible to prevent the occurrence of heating unevenness that occurs in the heated object.

  In addition, in the invention according to claim 4, in addition to the effect of the invention according to claim 3, the fuel gas is injected into the secondary air flowing through the fourth supply pipe by the gas injection means, and the inside of the fourth supply pipe is In addition, a gas mixture containing excess air can be formed. Therefore, when the heating power adjusted by the heating power adjusting means is adjusted to the high heating power side, the excess gas mixture is supplied to the flame outlet of the outward burner. Then, an all primary air type flame is formed at the flame outlet of the outward burner, and surplus air that does not participate in the formation of the all primary air flame is transferred to the flame ejected from the flame burner of the inward burner. On the other hand, it can be supplied as secondary air. Therefore, since the combustion state in each flame port of the inward burner can be made favorable, a stove burner that can improve the thermal efficiency can be provided.

  Hereinafter, the internal flamelet parent-child burner 10 which is the 1st Embodiment of this invention is demonstrated based on drawing. FIG. 1 is a perspective view of the gas stove 1, FIG. 2 is a perspective view of an internal flamelet parent-child burner 10 according to the first embodiment, and FIG. 3 is an internal structure of the internal flamelet parent-child burner 10. FIG. 4 is an explanatory diagram (low heat power state) showing the combustion state of the internal flamelet parent / child burner 10, and FIG. 5 is an explanatory diagram showing the combustion state of the internal flamelet parent / child burner 10 ( Strong firepower state).

  As shown in FIG. 2, in the internal flamelet parent / child burner 10 according to the present embodiment, the parent burner 12 and the child burner 18 are integrally formed, and the operation mode of the child burner 18 is switched corresponding to the thermal power. In this way, the heating unevenness generated in the heated object is prevented.

  Further, in the following description, “strong heating power side” and “weak heating power side” are, for example, the minimum to maximum heating power adjustment range that can be adjusted by the heating power adjustment lever 3 in the heating power of the internal flamelet parent-child burner 10. When “1” is assumed, the “range from 0 to less than 0.5” is referred to as a low heating power side, and the “range from 0.5 to 1” is referred to as a high heating power side. The boundary value between the low heat power side and the high heat power side is not limited to 0.5, and may be higher or lower than 0.5, for example, 0.6, 0.4, or the like.

  First, the gas stove 1 will be described. As shown in FIG. 1, the gas stove 1 is formed in a substantially rectangular parallelepiped box shape, and a top plate 2 is provided on the top surface thereof. Then, substantially circular openings 4 and 4 are opened on both the left and right sides of the top plate 2, respectively. Further, below the openings 4 and 4, the internal flamelet parent-child burner 10 which is a feature of the present invention is disposed. Further, in the vicinity of the outer peripheral edge of the opening 4 of the top plate 2, the virtues 5 are provided so as to cover the upper periphery of the internal flame-mouth burner 10 from above, and a cooking pot 29 is provided above the virtues 5. Placed.

  Further, on the front side facing the user of the gas stove 1, there are provided an operation switch 6 for igniting the internal flamelet parent / child burner 10 and an upper part of the operation switch 6. A thermal power adjustment lever 3 that can adjust the thermal power by manual operation is provided. Further, inside the gas stove 1, a gas amount corresponding to the heating power adjusted by the heating power adjusting lever 3 in conjunction with the pressing operation of the operating switch 6 is set behind the operation switch 6. A gas amount control unit 8 (see FIG. 3) to be supplied to 10 is provided. Furthermore, the above-described heating power adjusting lever 3 is connected to the gas amount control unit 8. The heating power adjusting lever 3 and the gas amount control unit 8 shown in FIG. 3 correspond to “heating power adjusting means”.

  Next, the schematic structure of the inner-flame parent-child burner 10 that is a feature of the present invention will be described. As shown in FIG. 2, the inner-flame parent-child burner 10 has an axial line in the vertical direction, a parent burner 12 formed in a substantially ring-shaped disk shape, an inner side of the parent burner 12, and the parent burner 12. And a child burner 18 which is arranged on the same axis and formed in a substantially cylindrical shape. A ring-shaped space 23 is formed in the gap between the inner peripheral surface 15 of the parent burner 12 and the outer peripheral surface 19 of the child burner 18 so that a flame is ejected. The space between the ring-shaped space 23 and the internal flamelet parent / child burner 10 and the cooking pot 29 is a combustion space for the internal flamelet parent / child burner 10. Note that the parent burner 12 in the present embodiment is an inward burner that injects a flame toward the inside, and the child burner 18 is an outward burner that injects a flame toward the inner peripheral surface 15 of the parent burner 12. . Hereinafter, the structure of each burner will be sequentially described. 2 corresponds to an “inward burner”, the child burner 18 corresponds to an “outward burner”, and the internal flamelet parent-child burner 10 corresponds to a “corner burner”. .

  First, the parent burner 12 will be described. As shown in FIGS. 2 and 3, the parent burner 12 includes a burner body 13 formed in a substantially ring-shaped disk shape. Inside the burner body 13, an air-fuel mixture chamber 25 (see FIG. 3) in which fuel gas and primary air flow in and mix is provided along the ring shape of the burner body 13. Further, the inner peripheral surface 15 of the burner body 13 is inclined obliquely so as to reduce the diameter toward the lower side of the ring-shaped space portion 23. In the inner peripheral surface 15, a plurality of first flame ports 16 that eject a flame toward the ring-shaped space portion 23 are arranged in a row along the circumferential direction of the inner peripheral surface 15. The first flame port 16 is formed in a slit shape and is inserted through the air-fuel mixture chamber 25.

  Further, as shown in FIG. 3, the bottom surface of the burner body 13 is provided with gas mixture inlets 25a and 25b that are inserted into the gas mixture chamber 25 and introduce a gas mixture of fuel gas and primary air. The mixed gas inlets 25a and 25b are respectively provided at locations facing each other via the ring-shaped space 23. One end of a mixed gas supply pipe 28 that supplies the mixed gas to the mixed gas chamber 25 is connected to the mixed gas introduction port 25a. On the other hand, one end of a mixed gas supply pipe 27 is connected to the mixed gas introduction port 25 b, and the other end opposite to the one end is connected to a connecting portion 35 provided in the middle of the mixed gas supply pipe 28. It is connected. The other end portion of the mixed gas supply pipe 28 is provided with a substantially conical connection portion 38, and an injection nozzle 50 a of a gas pipe 50 extending from the gas amount control unit 8 is provided in the connection portion 38. It is connected. A substantially ring-shaped primary air suction port 38a is provided so as to surround the outer periphery of the injection nozzle 50a.

  Next, the child burner 18 will be described. As shown in FIGS. 2 and 3, the child burner 18 includes a substantially columnar burner main body 17 extending in the vertical direction, and a substantially disc-shaped burner at one end portion on the upper side in the longitudinal direction of the burner main body 17. And a head 20. Inside the burner body 17, a mixed gas inflow pipe 17a that extends along the axis of the burner body 17 and into which the mixed gas or excess air gas flows is provided. Furthermore, a gas mixture chamber 26 that is inserted into the gas mixture inflow pipe 17 a is provided inside the burner head 20. On the other hand, the outer peripheral surface 19 of the burner head 20 is inclined obliquely so as to increase in diameter toward the lower side of the ring-shaped space portion 23. Furthermore, on the outer peripheral surface 19, a plurality of second flame ports 21 through which flames are ejected toward the ring-shaped space portion 23 are arranged along the circumferential direction of the outer peripheral surface 19. The second flame port 21 is formed in a slit shape and is inserted through the air-fuel mixture chamber 26.

  Further, one end portion of the mixed gas supply pipe 34 is connected to one end portion on the lower side in the longitudinal direction of the burner body 17. An outlet of the three-way valve 30 is connected to the other end of the mixed gas supply pipe 34 opposite to the one end. Furthermore, one end of the mixed gas supply pipe 33 is connected to one of the two inlets of the three-way valve 30. The other end of the mixed gas supply pipe 33 opposite to the one end is connected to the connecting portion 36 of the mixed gas supply pipe 28. Further, one end of a forced air supply pipe 31 is connected to the other inlet of the three-way valve 30, and a forced fan 40 for forcibly supplying primary air is connected to the other end opposite to the one end. Has been. Further, a valve controller 43 that controls opening and closing of the three-way valve 30 is connected to the three-way valve 30. The valve controller 43 is connected to the gas amount control unit 8 to which the thermal power adjustment lever 3 is connected. From the thermal power position adjusted by the thermal power adjustment lever 3, the thermal power set at the thermal power position is changed to “low thermal power side. It is detected whether it is “range” or “range on the high heat power side”, and the opening and closing of the three-way valve 30 is controlled based on the result.

  The mixed gas supply pipe 27 and the mixed gas supply pipe 28 shown in FIG. 3 correspond to a “first supply pipe”, the mixed gas supply pipe 34 corresponds to a “second supply pipe”, and the mixed gas The supply pipe 33 corresponds to a “third supply pipe”, and the forced air supply pipe 31 corresponds to a “fourth supply pipe”. Further, the valve controller 43 corresponds to “switching valve control means”.

Next, the combustion operation of the inner-flame parent-child burner 10 having the above configuration will be described. First, the operation switch 6 of the gas stove 1 shown in FIG. 1 is pressed. Then, as shown in FIG. 3, gas is ejected from the ejection nozzle 50 a of the gas pipe 50 connected to the gas amount control unit 8 in conjunction with the pressing operation of the operation switch 6. At this time, a gas amount corresponding to the thermal power adjusted by the thermal power adjusting lever 3 (see FIG. 1) is ejected from the injection nozzle 50a. When the gas is ejected from the injection nozzle 50a toward the connecting portion 38 of the mixed gas supply pipe 28, the primary air is sucked from the primary air suction port 38a with the force of the gas ejection. Therefore, in the mixed gas supply pipe 28, the fuel gas and the primary air are mixed to form a mixed gas. Further, the primary air ratio λ _{1 of} the mixed gas supplied to the mixed gas supply pipe 28 (λ ₁ = primary air amount / theoretical air amount; the theoretical air amount is the amount of air necessary for complete combustion of the fuel gas). However, the injection nozzle 50a and the primary air suction port 38a are designed so that the normal Bunsen flame is about 0.7.

  As shown in FIG. 3, one of the mixed gas flowing in the mixed gas supply pipe 28 flows into the mixed gas chamber 25 of the parent burner 12 from the mixed gas inlet 25 a. On the other hand, the flow of the other mixed gas is diverted from the connecting portion 35 and flows through the mixed gas supply pipe 27 and flows into the mixed gas chamber 25 from the mixed gas inlet 25b. In the parent burner 12, the mixed gas that has flowed into the mixture chamber 25 of the burner body 13 is supplied to the first flame ports 16 arranged on the inner peripheral surface 15 of the parent burner 12. At this time, in conjunction with the pressing operation of the operation switch 6 of the gas stove 1, the ignition electrode (not shown) disposed below the inner flamelet parent-child burner 10 sparks. Then, the sparks of the ignition electrode ignite the first flame port 16 of the parent burner 12, and then a fire transfer occurs in the other first flame port 16 adjacent to the first flame port 16. Accordingly, all of the first flaming holes 16 of the parent burner 12 are finally ignited, and flames are ejected from the first flaming holes 16 toward the ring-shaped space portion 23 based on the heating power adjusted by the heating power adjusting lever 3. Is done. Thus, the combustion state of the parent burner 12 is formed.

  On the other hand, in the sub-burner 18, the “flame ejection state” and “secondary air ejection state” depend on whether the thermal power adjusted by the thermal power control lever 3 is “low thermal power range” or “high thermal power range”. Either state is formed. Accordingly, the thermal power adjusted by the thermal power control lever 3 is divided into a case of “low thermal power side range” and a case of “high thermal power side range”, which will be sequentially described below.

  First, a case where the thermal power adjustment lever 3 is adjusted to “a range on the weak thermal power side” will be described. As shown in FIG. 4, when the heating power adjustment lever 3 is set to the “low heating power range”, the ejection distance of the flames ejected from the first flame port 16 of the parent burner 12 is short, so that the tips of the respective flames Does not reach the child burner 18 and blows upward. Therefore, since the temperature near the approximate center of the opening 4 is lowered, the child burner 18 is brought into the “flame ejection state” by the following operation.

  First, as shown in FIG. 4, when the thermal power adjustment lever 3 shown in FIG. 1 is manually adjusted to the “low thermal power range”, the gas amount control unit 8 is based on the adjusted thermal power position. A gas amount based on the heating power is ejected from the injection nozzle 50a into the mixed gas supply pipe 28. On the other hand, the valve controller 43 determines that the heating power adjusted by the heating power adjusting lever 3 in the gas amount control unit 8 is within the “low heating power range”. Then, the valve controller 43 outputs a control signal to the three-way valve 30 so as to open the inlet valve on the mixed gas supply pipe 33 side and close the inlet valve on the forced air supply pipe 31 side. The three-way valve 30 opens the inlet valve on the mixed gas supply pipe 33 side and closes the inlet valve on the forced air supply pipe 31 side based on the control signal.

  Then, a part of the mixed gas flowing through the mixed gas supply pipe 28 flows through the mixed gas supply pipe 33 through the connecting portion 36, and flows through the mixed gas supply pipe 34 through the three-way valve 30. Next, the mixed gas flows from the mixed gas supply pipe 34 into the mixed gas inflow pipe 17 a in the burner body 17 of the child burner 18. Further, the mixed gas flows into the mixed gas chamber 26 of the burner head 20 from the mixed gas inflow pipe 17 a and is supplied to the second flame ports 21 arranged on the outer peripheral surface 19 of the child burner 18. Then, in the same manner as the first flame port 16 of the parent burner 12, the second flame port 21 of the child burner 18 is ignited by the spark of the ignition electrode (not shown), and then the other adjacent to the second flame port 21. The second crater 21 has a fire transfer. Therefore, finally, all the second flame ports 21 of the child burners 18 are ignited, and a flame is ejected from the second flame ports 21 toward the ring-shaped space portion 23.

In addition, since the mixed gas having the same primary air ratio (λ ₁ = about 0.7) as that of the first flame mouth 16 is supplied to the second flame mouth 21, the first flame mouth 21 is supplied with the first flame mouth 21. A Bunsen flame equivalent to 16 is ejected. Therefore, a flame ejected from each second flame port 21 of the child burner 18 is formed near the approximate center of the opening 4 where the flame ejected from each first flame port 16 of the parent burner 12 does not reach. The entire pan bottom of the cooking pot 29 can be heated evenly. Thus, the combustion state of the inner-flame parent-child burner 10 is formed by forming the “flame ejection state” of the child burner 18.

  Next, a case where the heating power adjustment lever 3 is adjusted to “a range on the strong heating power side” will be described. As shown in FIG. 5, when the heating power adjustment lever 3 is set to the “high heating power range”, the ejection distance of the flame ejected from the first flame port 16 of the parent burner 12 in the narrow ring-shaped space portion 23 is long. Therefore, the tip of each flame reaches the vicinity of the child burner 18. And each flame collides in the approximate center of the opening part 4, and blows up upwards as it is. Therefore, the temperature in the vicinity of the approximate center of the opening 4 is increased, and the thermal efficiency is also deteriorated. Therefore, in the internal flamelet parent-child burner 10 of the first embodiment, the child burner 18 is set to the “secondary air ejection state”.

  First, as shown in FIG. 5, when the heating power adjustment lever 3 shown in FIG. 1 is manually adjusted to a “high heating power range”, the gas amount control unit 8 is based on the adjusted heating power position. A gas amount based on the heating power is ejected from the injection nozzle 50a into the mixed gas supply pipe 28. On the other hand, the valve controller 43 determines that the heating power adjusted by the heating power adjustment lever 3 in the gas amount control unit 8 is within the “high heating power side range”. Then, the valve controller 43 outputs a control signal to the three-way valve 30 so as to close the inlet valve on the mixed gas supply pipe 33 side and open the inlet valve on the forced air supply pipe 31 side. The three-way valve 30 closes the inlet valve on the mixed gas supply pipe 33 side and opens the inlet valve on the forced air supply pipe 31 side based on the control signal.

  Then, since the flow path from the mixed gas supply pipe 28 to the mixed gas supply pipe 34 is closed by the three-way valve 30, the mixed gas flowing through the mixed gas supply pipe 28 does not flow into the child burner 18. On the other hand, the air forcibly supplied from the forced fan 40 flows through the forced air supply pipe 31 and flows into the mixed gas inflow pipe 17 a in the burner body 17 of the child burner 18 through the three-way valve 30. Further, the air flows from the mixed gas inflow pipe 17 a into the mixed gas chamber 26 of the burner head 20 and is supplied to the second flame ports 21 arranged on the outer peripheral surface 19 of the child burner 18. And the air supplied to each 2nd flame mouth 21 is ejected with respect to the flame which ejects from each 1st flame mouth 16 of the parent burner 12 as secondary air. At this time, a large amount of oxygen is consumed in the vicinity of the approximate center of the ring-shaped space 23 where the respective flames are densely packed. However, since the combustion air is supplied from the second flame port 21, sufficient oxygen is insufficient for combustion. It can be secured. Therefore, the combustion performance of the flame ejected from the first flame port 16 can be improved. As a result, it is possible to narrow the combustion space while maintaining a good combustion state. For example, the distance between the cooking pan 29 and the internal flame burner parent and child burner 10 is shortened to widen the contact area between the pan bottom and the flame. Thus, the thermal efficiency can be improved. Moreover, since secondary air is supplied to the vicinity of the center of the opening part 4 where the flame tips of the first flame outlet 16 concentrate, the temperature near the center of the opening part 4 can be dispersed around it. Therefore, since the pan bottom of the cooking pan 29 is heated uniformly, the pan bottom can be prevented from being burnt.

  As described above, according to the inner flamelet parent-child burner 10 of the first embodiment, the thermal power adjusted by the thermal power adjustment lever 3 depends on whether the “low thermal power range” is the “high thermal power range”. In the child burner 18, either the “flame ejection state” or the “secondary air supply state” is formed. For example, when the thermal power is set to the “low thermal power side range”, the same amount of mixed gas as that of the first flame port 16 of the parent burner 12 is supplied to the second flame port 21 of the child burner 18. A flame of the same level as the flame outlet 16 is ejected. Therefore, a flame ejected from each second flame port 21 of the child burner 18 is formed near the approximate center of the opening 4 where the flame ejected from each first flame port 16 of the parent burner 12 does not reach. The entire pan bottom of the cooking pot 29 can be heated evenly. Further, when the heating power is set to “a range on the strong heating power side”, air is blown from the forced fan 40 to the second flame outlet 21, so that the second flame 21 is not subjected to two flames ejected from the first flame outlet 16. Secondary air can be supplied. Therefore, a sufficient oxygen concentration that is likely to be insufficient in the vicinity of the approximate center of the ring-shaped space 23 can be secured, so that the combustion performance of the flame ejected from the first flame port 16 can be improved. Moreover, since secondary air is supplied to the vicinity of the center of the opening part 4 where the flame tips of the first flame outlet 16 concentrate, the temperature near the center of the opening part 4 can be dispersed around it. Therefore, since the pan bottom of the cooking pan 29 is heated uniformly, the pan bottom can be prevented from being burnt.

  Next, the internal flamelet parent-child burner 100 which is 2nd Embodiment is demonstrated with reference to FIG. FIG. 6 is a schematic view of the internal flame-parent-child burner 100 according to the second embodiment. The inner-flame parent-child burner 100 of the second embodiment is a modification of the inner-flame parent-child burner 10 according to the first embodiment, and has a structure in which gas is injected into the air flowing through the forced air supply pipe 310. It is provided. Therefore, since the structure other than that is the same as that of the internal flamelet parent-child burner 10 according to the first embodiment, only the structure for injecting gas into the air flowing through the forced air supply pipe 310 will be described. The above explanation is used for explanation of. In the internal flamelet parent / child burner 100 according to the second embodiment, when the heating power adjustment lever 300 is adjusted within the “range on the high heating power side”, the air from the second flame mouth 210 of the child burner 180 It is characterized by the “air-excess gas mixture gas ejection state” in which an excess gas mixture gas is ejected.

  As shown in FIG. 6, the inner-flame parent-child burner 100 includes a parent burner 120 and a child burner 180 that are the same as the inner-flame parent-child burner 10 according to the first embodiment. A gas inlet 310a for injecting fuel gas into the combustion air flowing in the pipe is provided in the middle of the pipe of the forced air supply pipe 310 connected to the forced fan 400. Furthermore, in addition to the first gas pipe 500, a second gas pipe 510 is connected to the gas amount control unit 80, and one end of the downstream side through which the fuel gas flows in the second gas pipe 510 has An injection nozzle 510a through which fuel gas is ejected is provided. Further, the tip of the injection nozzle 510 a is fitted inside the gas inlet 310 a of the forced air supply pipe 310. The second gas pipe 510 and the injection nozzle 510a shown in FIG. 6 correspond to “gas injection means”.

Next, the operation of the internal flamelet parent-child burner 100 will be described. In addition, in the internal flamelet parent-child burner 100, the operation | movement of the internal flamelet parent-child burner 10 which is 1st Embodiment is made into a basis. When the heating power adjustment lever 300 is adjusted to “a range on the strong heating power side”, not only the air as in the first embodiment but also the excess air with respect to the air-fuel mixture chamber 260 of the child burner 180. Gas mixture gas (for example, primary air ratio λ ₁ = about 1.3 to 1.4) is supplied. Therefore, the operation of the internal flamelet parent / child burner 100 when the heating power adjusting lever 300 is adjusted within the “range on the strong heating power side” will be described.

  First, as shown in FIG. 6, when the thermal power adjustment lever 300 is manually adjusted to “a range on the high thermal power side”, the gas amount control unit 80 starts from the injection nozzle 500 a based on the adjusted thermal power position. A gas amount based on the thermal power is ejected into the mixed gas supply pipe 280. On the other hand, the valve controller 430 determines that the heating power adjusted by the heating power adjustment lever 300 in the gas amount control unit 80 is within the “high heating power range”. Then, the valve controller 430 outputs a control signal to the three-way valve 333 so as to close the inlet valve on the mixed gas supply pipe 330 side and open the inlet valve on the forced air supply pipe 310 side. Based on the control signal, the three-way valve 333 closes the valve on the inlet side on the mixed gas supply pipe 330 side and opens the valve on the inlet side on the forced air supply pipe 310 side.

Then, the fuel gas flowing through the first gas pipe 500 of the gas amount control unit 80 flows into the mixed gas supply pipe 280. Then, the mixed gas flowing through the mixed gas supply pipe 280 does not flow into the child burner 180 because the flow path to the mixed gas supply pipe 340 is blocked by the three-way valve 333, so Flowing into. On the other hand, the fuel gas flowing through the second gas pipe 510 is injected from the injection nozzle 510 a into the gas inlet 310 a of the forced air supply pipe 310. Then, fuel gas is injected into the air flowing through the forced air supply pipe 310. In the forced air supply pipe 310, a gas mixture containing excess air is formed. Incidentally, the primary air ratio lambda ₁ of the mixed gas supplied to the forced air supply pipe 310, so that about 1.3 to 1.4, the injection nozzle 510a is designed. Further, the excess air mixed gas flows through the forced air supply pipe 310, flows into the mixed gas supply pipe 340 through the three-way valve 333, and flows into the mixed gas inflow pipe 170 a in the burner body 170 of the child burner 180. . Further, the excess air gas mixture gas flows into the gas mixture chamber 260 and is supplied to each of the second flame ports 210 arranged on the outer peripheral surface 190 of the child burner 180. In each second flame port 210, a fire transfer occurs due to the flame ejected from each first flame port 160, and a flame smaller than the flame ejected from the first flame port 160 is ejected. Further, in the air excess gas mixed gas, the air that does not participate in the flame formation at the second flame port 160 is used as the secondary air of the flame ejected from the first flame port 160.

  Therefore, as in the first embodiment, not only the secondary burner 180 is simply extinguished and secondary air is supplied, but also the primary flame is formed by burning all primary air at the second flame port 210. As such, the pan bottom of the cooking pan 290 can be heated more uniformly by supplying the gas mixture containing excess air. In addition, since secondary air is supplied to the ring-shaped space 230, a sufficient oxygen concentration can be secured, so that the combustion state of the flame of the parent burner 120 can be improved, and a heat efficient burner and can do. Thus, even if the outer diameter of the burner is not increased, the heat distribution of the ring-shaped space 230 can be improved, and the internal flame burner parent / child burner 100 with high thermal efficiency can be obtained.

  As described above, according to the internal flamelet parent-child burner 100 according to the second embodiment, the forced air supply pipe 310 is configured based on the structure and operation of the internal flamelet parent-child burner 10 according to the first embodiment. A structure for injecting fuel gas into flowing air is provided. When the heating power adjustment lever 300 is adjusted within the “high heating power range”, the gas mixture containing excess air is ejected from the second flame port 210 of the child burner 180. is there. Therefore, by supplying a gas mixture containing excess air, a normal Bunsen flame can be formed in the second flame outlet 210, so that the bottom of the cooking pot 290 can be heated more uniformly. In addition, since secondary air is supplied to the ring-shaped space 230, a sufficient oxygen concentration can be secured, so that the combustion state of the flame of the parent burner 120 can be improved, and a heat efficient burner and can do. Thus, even if the outer diameter of the burner is not increased, the heat distribution of the ring-shaped space 230 can be improved, and the internal flame burner parent / child burner 100 with high thermal efficiency can be obtained.

  In addition, this invention is not limited to the said embodiment explained in full detail above, It cannot be overemphasized that various deformation | transformation are possible.

  For example, the valve controller 43 of the first embodiment controls the opening and closing of the three-way valve 30 based on the adjusted heating power of the heating power adjustment lever 3, but switching independent of the operation of the heating power adjustment lever 3 is performed. Switching means such as a knob may be newly provided, and the opening and closing of the three-way valve 30 may be controlled by manual operation thereof.

  The gas stove according to the present invention can be applied to a table stove used by being placed on a cooking table, a built-in stove used by being incorporated in a cooking stove, or the like.

1 is a perspective view of a gas stove 1. FIG. 1 is a perspective view of an inner flamelet parent-child burner 10 according to a first embodiment. 1 is a schematic diagram showing an internal structure of an internal flamelet parent-child burner 10. FIG. It is explanatory drawing (low heat power state) which shows the combustion state of the internal flamelet parent-child burner. It is explanatory drawing (high heat power state) which shows the combustion state of the internal flamelet parent-child burner 10. FIG. It is a schematic diagram of the internal flame-mouth parent-child burner 100 which is 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas stove 3 Thermal power control lever 8 Gas quantity control unit 10 Inner flame parent-child burner 12 Parent burner 15 Inner peripheral surface 16 First flame port 18 Child burner 19 Outer surface 21 Second flame port 27 Mixed gas supply pipe 28 Mixed gas Supply pipe 30 Three-way valve 31 Forced air supply pipe 33 Mixed gas supply pipe 34 Mixed gas supply pipe 40 Forced fan 43 Valve controller 80 Gas amount control unit 100 Internal flame parent-child burner 120 Parent burner 160 Flame outlet 180 Child burner 190 Outer peripheral surface 210 Flame outlet 280 Mixed gas supply pipe 333 Three-way valve 300 Thermal power control lever 310 Forced air supply pipe 310a Gas inlet 330 Mixed gas supply pipe 400 Forced fan 430 Valve controller 510 Second gas pipe

Claims (4)

An annular inward burner in which a plurality of flame openings are arranged in the circumferential direction of the inner peripheral surface;
In the stove burner provided with an outward burner that is arranged on the inner side of the inward burner and coaxially with the inward burner and in which a plurality of flame openings are arranged in the circumferential direction of the outer peripheral surface,
When the heating power of the inward burner is set to the high heating power side, only the secondary air or the gas mixture containing excess air is supplied to the flame outlet of the outward burner. Burner.   When the heating power of the inward burner is set to a low heating power side, the flame outlet of the outward burner is equivalent to a mixed gas composed of fuel gas and primary air supplied to the flame outlet of the inward burner The stove burner according to claim 1, wherein a mixed gas having an air ratio of is supplied. Thermal power adjusting means for adjusting the thermal power of the inward burner from strong thermal power to weak thermal power,
A first supply pipe connected to the inward burner and configured to supply a mixed gas composed of fuel gas and primary air to a flame opening of the inward burner;
A second supply pipe connected at one end to the outward burner, and supplying only mixed gas or secondary air to the flame outlet of the outward burner;
A switching valve connected to the other end side opposite to the one end side of the second supply pipe;
A third supply pipe having one end connected to the switching valve and the other end opposite to the one end connected to the middle of the first supply pipe;
A fourth supply pipe having one end connected to the switching valve;
A secondary air forced air blowing means connected to the other end side opposite to the one end side of the fourth supply pipe and forcibly blowing secondary air;
Switching valve opening / closing control means for controlling the opening / closing of the switching valve by the heating power adjusted by the heating power adjusting means,
When the heating power adjusting means is adjusted to the strong heating power side, the switching valve control means supplies secondary air from the fourth supply pipe to the second supply pipe,
When the heating power adjusting means is adjusted to the low heating power side, the switching valve control means controls opening and closing of the switching valve so as to supply a mixed gas from the third supply pipe to the second supply pipe. The stove burner according to claim 1 or 2, wherein the stove burner is provided. Gas injection means for injecting fuel gas into the fourth supply pipe;
When a gas mixture containing excess air is generated in the fourth supply pipe and the heating power adjusting means is adjusted to a strong heating power, the switching valve control means connects the fourth supply pipe to the second supply pipe. The stove burner according to claim 3, wherein an excess gas mixture gas from is supplied.

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