JP4639319B2 - Stove - Google Patents

Description

  The present invention relates to a stove including a forced combustion type burner to which combustion air is supplied by an air supply fan and heating a cooking vessel by the burner.

  As a burner used for a stove such as a table stove, a natural combustion type Bunsen burner and a forced combustion type burner for supplying all of air necessary for combustion by an air supply fan are known. Among these, the Bunsen burner is often used because a wide range of combustion amount can be secured (gas input 10% to 100%) and it can easily cope with a wide range of thermal power control required for cooking (see, for example, Patent Document 1). ).

JP 2003-161449 A

  As described above, the Bunsen burner has a large TDR (thermal power draw ratio) and can ensure usability, but has a drawback of low thermal efficiency. In this respect, the forced combustion burner has higher thermal efficiency than the Bunsen burner, and is expected to become more popular due to the recent trend in which environmental protection is emphasized in the stove and the like. However, on the contrary, compared with the Bunsen burner, there is a characteristic that the combustion range is very narrow and TDR cannot be made large, and it is not suitable for a stove that requires a wide range of thermal power control.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a stove that can be used in a wide range of thermal power control and can be used with ease by using a forced combustion burner with high thermal efficiency.

In order to achieve the above object, according to the first aspect of the present invention, the burner body is arranged such that the other burner body having a larger diameter in order from the burner body located at the center is coaxially and annularly lowered stepwise. The outer burner is divided into a plurality of openings that open upward, while the burner head is stacked in a vertical direction below the burner head, with a disc-shaped uppermost burner head having a flame opening formed on the outer periphery of the lower surface. And a plurality of disc-shaped burner heads that form a flame hole on the outer periphery on the lower surface side and that project through the center and are connected to the opening of the upper burner body downward. A plurality of outward-facing flame burners that are forced-burning burners are provided in the vertical direction, and the flame outlets of each outward-flame burner are vertically aligned with the flame outlets of the other adjacent vertical flame burners. do not overlap as with shifting in the circumferential direction, each of its outward Provided branch supply passage branching from the gas supply means for each flame hole burner, is characterized in that the burning is switched outward flame hole burners in accordance with the gas supply amount of the combustion control means.
In addition to the object of claim 1, the invention described in claim 2 is characterized in that the virtuosity claw is formed in a plane spiral shape in order to increase the contact distance between the cooking vessel and the combustion gas and improve the thermal efficiency. The combustion gas of the outward flame burner can be discharged to the outside from the spiral combustion gas exhaust passage surrounded by the five virtue claws, the five virtue rings, and the cooking container with the cooking container placed on the five virtue claws. It is.

In addition to the object of claim 1 or 2 , the invention described in claim 3 is characterized in that in order to suppress heat dissipation by the virtually ring and maintain high thermal efficiency, , A double structure comprising a back plate bonded to the front plate at a predetermined interval.
In addition to the object of any one of claims 1 to 3 , the invention described in claim 4 provides the exhaust velocity of the combustion gas in a ring-shaped combustion gas passage formed between the bottom surface of the cooking vessel and the five virtue rings. In order to maintain the inner circumference to the outer circumference and improve the thermal efficiency, with the cooking container placed on the virgin claws, the passage sectional area of the combustion gas passage is equal to the inner circumference side of the virtually ring than the outer circumference side or It is set to be larger.

According to the first aspect of the present invention, a high TDR can be obtained while maintaining high thermal efficiency by the forced combustion type outward flame burner, and a wide range of thermal power can be adjusted even with the forced combustion type burner. Suitable cooking becomes possible.
Further , by shifting the flame port of the outward flame port burner in the circumferential direction, the flames complement each other with heat and the heat distribution becomes uniform, so that cooking can be performed without unevenness.
According to the second aspect of the invention, in addition to the effect of the first aspect , the contact distance between the cooking vessel and the combustion gas is increased and the thermal efficiency is improved by forming the five virtue claws in a plane spiral shape. It is done.
According to the third aspect of the invention, in addition to the effect of the first or second aspect , since the five-virtual ring has a double structure, heat radiation by the five-devil ring is suppressed, and high thermal efficiency can be maintained.
According to the fourth aspect of the present invention, in addition to the effect of any one of the first to third aspects, the passage cross-sectional area of the combustion gas passage is set to be equal or larger on the inner peripheral side than on the outer peripheral side. The exhaust speed of the combustion gas can be maintained from the inner periphery to the outer periphery, and improvement in thermal efficiency can be expected.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of a table stove that is an example of a stove to which the present invention is applied. In the table stove 1, a burner unit 4 is disposed in an opening 3 formed in a top plate 2, and the burner unit On the top plate 2 above 4, the five virtues 5, which are composed of the five virtue rings 6 opened in the center and the five virtue claws 7, 7. The cooking container P can be placed.
The burner unit 4 includes four burners from a first burner 8 to a fourth burner 11 including a burner main body to which fuel gas is supplied and a burner head placed on the burner main body. The lower part of the burner unit 4 is housed in an air box 12 that houses an air supply fan 13, and the air required for combustion is forcibly supplied to the burners 8 to 11 by the rotation of the air supply fan 13. The

  The burner body of each of the burners 8 to 11 is arranged on the burner body 14 of the first burner 8 located in the center of the burner unit 4, the burner body 15 of the second burner 9, and the burner body 16 of the third burner 10, which become larger in order. The burner main bodies 17 of the fourth burner 11 are coaxially and annularly packaged, and open upward. Here, the opening of each burner body 14 to 17 is located at the highest position of the burner body 14 of the first burner 8, and then gradually decreases in the order of the burner bodies 15, 16 and 17. The burner heads 18 to 21 placed on ˜17 can be stacked in the vertical direction. And the base end of each burner main body 14-17 is opened independently in the air box 12, and gas nozzles 22, 22,... Branched from the gas supply path are provided at each base end. .

  FIG. 2 is a cross-sectional view of the burner head 18 portion in the burner unit 4. As shown here, each of the burner heads 18 to 21 has a plurality of inclined surfaces inclined at a predetermined angle from the radial direction to the circumferential direction on the lower surface periphery of the disk. Ribs 23, 23... Project from each other, and groove-shaped flame openings 24, 24... Inclined at the same angle are formed between the ribs 23, 23. The burner heads 19 to 21 excluding the burner head 18 of the first burner 8 are each formed with a cylindrical portion 25 that passes through the disk and is connected to the burner body on the upper burner side, and the burner head of the fourth burner 11 21 is at the bottom, and the burner heads 20 to 18 from the third burner 10 to the first burner 8 are stacked concentrically and sequentially upward so that the air-fuel mixture in each burner body 14 to 17 is burner heads 18 to 21 respectively. It is possible to form an independent air-fuel mixture path that is spirally ejected from the outer periphery. Further, each burner head 18 to 21 is vertically stacked with the flame outlets 24 of other burners adjacent to each other in the vertical direction in a stacked state, like the flame outlet 24 of the burner head 19 indicated by a dotted line in FIG. In order not to overlap with each other, the position in the circumferential direction is shifted.

  The gas nozzles 22, 22,... Are connected to branch pipes 36, 36,... As branch supply paths branched from the gas pipes to the table stove 1, and each branch pipe 36 is connected to each burner 8-11. Solenoid valves 26 to 29 capable of adjusting the gas amount are provided, and are controlled to be opened and closed by the controller 30, respectively. The controller 30 includes a knob 32 as a heating power adjusting means for operating a gas supply path adjustment valve, and is electrically connected to a control unit 31 that opens and closes the gas supply path in conjunction with an ignition button (not shown). The electromagnetic valves 26 to 29 are controlled to open and close in accordance with the heating power selected by. Here, the maximum calorific value in each of the burners 8 to 11 is 3000 kcal / h for the first burner 8, 1500 kcal / h for the second burner 9, 750 kcal / h for the third burner 10, and 375 kcal / h for the fourth burner 11. In the burners below the second burner 9, half the maximum heat generation amount of the upper burner is set as the maximum heat generation amount.

On the other hand, in Gotoku 5, the Gotoku ring 6 is formed in a mortar shape that gradually increases from the inner peripheral side to the outer peripheral side, and the upper front plate 33 and the lower back plate 34 are connected to the inner and outer peripheral sides. As shown in FIG. 3, the front plate 33 and the back plate 34 are separated from each other by a predetermined interval by caulking and fixing at four locations on the outer peripheral end portion and the inner peripheral end portion as shown in FIG. It has a double structure to be joined.
Moreover, the virtuosity claw 7 is formed so that it may become spiral shape from the inner peripheral side of the virtuosity ring 6 seeing from the upper side to the outer peripheral side, and the cooking container P can be placed on the upper end surface of each virtuosity claw 7. So that it is horizontal. Therefore, when the cooking container P is placed on the five virtue claws 7, a spiral combustion gas passage surrounded by the bottom of the cooking container P and the five virtue claws 7 is formed in the gortoku 5.
Further, here, in the ring-shaped combustion gas passage whose upper and lower sides are closed by the upper surface of the mortar-shaped Gotoku ring 6 and the bottom surface of the cooking container P, the passage cross-sectional area is equal to or more than the outer peripheral side. It is set to be large.

In the table cooker 1 configured as described above, when the cooking container P is placed on the virtues 5 and an ignition button (not shown) is pressed, a part of burners (set to be used in advance as the heating power at the time of ignition) Here, the fuel gas is supplied from the gas nozzles 22 of the first and second burners 8 and 9), and the controller 30 rotates the supply fan 13 to burn each burner body 14 and 15 in the air box 12. Supply air forcibly. Therefore, the air-fuel mixture is mixed in the burner bodies 14 and 15 and ejected from the respective flame outlets 24 of the burner heads 18 and 19 and ignited by the operation of an igniter (not shown). The flame is formed in a spiral shape by the inclination of each flame opening 24.
When the thermal power is adjusted by the knob 32, the controller 30 opens and closes the electromagnetic valves 26 to 29 or adjusts the opening degree according to the required thermal power to switch the combustion of the burners 8 to 11, and appropriately The number of rotations of the air supply fan 13 is controlled so that the air / fuel ratio becomes a proper value.

  However, the controller 30 is set so that each burner 8 to 11 uses half of its maximum heat generation as the minimum heating power, that is, each burner 8 to 11 is used at a TDR of 50%. The opening degree of the solenoid valves 26 to 29 is controlled in the range of the heat generation amount. The minimum calorific value of the fourth burner 11 is 180 kcal / h. Therefore, in this burner unit 4, one or a plurality of the burners 8 to 11 are selected and combined according to the required heating power, so that the heating power “weak” (180 kcal / 180 k) using only the fourth burner 11 at the minimum opening. The heating power can be adjusted in a range from h) to the heating power “strong” (5625 kcal / h) using all the first to fourth burners 8 to 11 at the maximum opening.

In addition, the combustion gas passes through a spiral combustion gas passage formed between the bottom surface of the cooking container P, the five virtue rings 6 and the five virtue claws 7 and reaches the outer periphery of the cooking container P. Along the top. Therefore, the cooking container P is heat-exchanged with the combustion gas at the bottom and side surfaces, and the thermal efficiency is improved. At this time, the combustion gas heats the front plate 33 of the Gotoku ring 6, but since the Gotoku ring 6 has a double structure, the space between the front plate 33 and the back plate 34 serves as a heat insulating layer. It functions, and the heat of the front plate 33 does not radiate from the back plate 34. Therefore, the combustion gas heat can be effectively used for heating the cooking vessel P.
Further, in the combustion gas passage between the upper surface of the Gotoku ring 6 and the bottom surface of the cooking container P, the passage sectional area is set so that the inner peripheral side is equal to or larger than the outer peripheral side. On the inner circumference side close to 4, the combustibility is not impaired, and on the outer circumference side far from the burner unit 4, the passage area can be narrowed to increase the flow velocity of the combustion gas.

Thus, according to the table stove 1 of the said form, while providing several 1st-1st burners 8-11 used as an outward flame burner, a branch supply path is provided for each of the burners 8-11, and a knob By switching each burner 8-11 according to the gas supply amount by 32 and burning, the TDR can be increased while maintaining high thermal efficiency by the forced burner 8-11, and the forced combustion burner Even so, a wide range of heating power adjustments can be made, and suitable cooking becomes possible.
Further, in this burner unit 4, the flames 24 of each of the burners 8 to 11 are shifted in the circumferential direction so as not to overlap with the other vertical flame ports 24 in the vertical direction, so that the flames complement each other. Thus, the heat distribution becomes uniform, and the cooking container P can be cooked without unevenness.

Furthermore, the virtuosity claw 7 is formed in a plane spiral shape, and the burning gas of each burner 8 to 11 is put in the state where the cooking vessel P is placed on the virtuosity claw 7. Since the discharge from the spiral combustion gas exhaust passage surrounded by is possible to the outside, the contact distance between the cooking vessel P and the combustion gas becomes longer, which leads to further improvement in thermal efficiency.
In addition, here, the five virtue ring 6 has a double structure comprising a front plate 33 on which the five virtue claws 7 are erected and a back plate 34 joined to the front plate 33 at a predetermined interval. The heat radiation by the five virtue rings 6 is suppressed, and high thermal efficiency can be maintained.
And, since the cooking gas passage P is placed on the five virtue claws 7, the passage sectional area of the combustion gas passage is set so that the inner peripheral side of the five virtue ring 6 is equal to or larger than the outer peripheral side. It is possible to improve the thermal efficiency by maintaining the exhaust speed of the combustion gas in the gas passage from the inner periphery to the outer periphery.

  In the above embodiment, the outward-facing flame burner is provided in the up-down direction. However, as shown in FIG. 4, for example, in the burner unit 40 provided with a plurality of flame-holes, The air-fuel mixture approach passage 41 is connected to one chamber, and the entrance passage 42 is connected to the other chamber, and the flame F from all the flame openings 43 and 44 in the case of strong fire power (FIG. 2A) ) And the flame F (FIG. (B)) from only the flame outlet 43 in the case of weak fire power, it can be used substantially as two outward flame burners. It is also possible to perform switching according to such a thermal power by dividing into three or more groups.

  In addition, in the case where the flame mouth is formed in the vertical direction as in the burner unit 4 shown in FIG. 1, in addition to the position setting of the flame mouth that does not overlap in the vertical direction, for example, the bottom and top flame ports are connected to the burner unit. If the direction of the crater is also changed for each burner so that the two-stage craters in the meantime are inclined at a predetermined angle from the radial direction in opposite directions, the interference between the flames F It will be easier to avoid.

On the other hand, the switching combustion of the outward flame burner according to the heating power is not limited to the opening / closing control of the solenoid valve by the controller, but the branch gas flow path to each outward flame burner is controlled by the flow of the regulating valve operated by the knob. A configuration is also conceivable in which an outward flame burner to be burned is selected according to the required thermal power by switching depending on the road.
In addition, Gotoku may eliminate ceramics and evacuate the interior, or may not be limited to a double structure, and may be subjected to heat treatment such as ceramic coating on the surface. The present invention can be adopted even with a built-in stove incorporated in a counter or the like.

It is explanatory drawing of a table stove. It is a section explanatory view of a burner head. It is a top view of five virtues. It is explanatory drawing which shows the example of a change of a burner unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Table stove, 2 ... Top plate, 4,40 ... Burner unit, 5 ... Gotoku, 6 ... Gotoku ring, 7 ... Gotoku nail, 8 ... 1st burner, 9 ... 2nd burner, 10 ... 3rd burner, 11 4th burner, 12 air box, 13 supply fan, 14-17 burner body, 18-21 burner head, 22 gas nozzle, 24 flame outlet, 30 controller, 32 knob.

Claims (4)

A burner body which fuel gas is supplied, placed on the burner body, an outward flame hole burner comprising a burner head which is formed on the outer periphery of the flame hole of the ejection direction inclined to a predetermined angle circumferentially from the radial direction A gas supply means for supplying a fuel gas to the outward flame outlet burner, and a virtuity in which a plurality of five virtue claws for placing a cooking container are erected on a gort ring set around the outward flame outlet burner And a stove comprising an air supply fan for supplying combustion air to the outward flame burner, and a thermal power adjusting means for adjusting a gas supply amount by the gas supply means,
The burner main body is a plurality of the burner main bodies that are positioned in the center so that the other burner main bodies that have a larger diameter in order are coaxially and annularly and gradually lowered, and each is opened upward. On the other hand, the burner head is stacked in a disc-shaped uppermost burner head in which the flame opening is formed on the outer periphery on the lower surface side, and is vertically stacked below the burner head to form the flame hole on the outer periphery on the lower surface side. And the plurality of other burner heads having a cylindrical shape projecting downwardly through the center and connected to the opening of the burner body on the upper side, the outward flame burner A plurality of vertical flame outlets are provided, and the flame outlets of the respective outward flame burners are shifted in the circumferential direction so as not to overlap with the flame outlets of the other outward flame burners adjacent in the vertical direction. The gas supply hand for each orientation burner Stove provided branch supply paths branching, characterized in that burning is switched to the outward flame hole burners in accordance with the gas supply amount of the combustion control means from. A virtue claw is formed in a plane spiral shape, and the combustion gas of the outward flame burner is placed in a spiral shape surrounded by the virtue claw, the virtuosity ring and the cooking vessel with the cooking vessel placed on the virtuosity claw. The stove according to claim 1, wherein the stove can be discharged to the outside from the combustion gas exhaust passage. The stove according to claim 1 or 2 , wherein the virtuosity ring has a double structure composed of a front plate on which the virtuosity claw is erected and a back plate joined to the front plate at a predetermined interval. In the state where the cooking container is placed on the five virtue claws, the cross-sectional area of the ring-shaped combustion gas passage formed between the bottom surface of the cooking container and the five virtue rings is set so that the inner peripheral side of the five virtue rings is more than the outer peripheral side. The stove according to any one of claims 1 to 3 , wherein the stove is set to be equal or larger.

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