JP2006138595A - Gas cookstove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable sufficient heat exchange with a cooking vessel by revolution of combustion gas, by eliminating blocking-up of a combustion gas passage by soup. <P>SOLUTION: A trivet 5 is formed of eight guide walls 15, 15, etc. vertically placed by forming a belt-like plate body having the same width (10 mm) in a curved shape up to the outer peripheral side from the inner peripheral side, an inner connecting ring 16 for connecting the mutual inside edges of the respective guide walls 15, and an outer connecting ring 17 concentric with the inner connecting ring 16 by connecting the mutual outside edges of the respective guide walls 15; and opens a lower part between the respective guide walls 15. Thus, even if the soup is splashed on the trivet 5, since the soup drips downward by passing through between the guide walls 15 as it is or going along the guide wall 15, there is no risk of blocking up the combustion gas passage 19 between the guide walls 15 and 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gas stove provided with a burner for heating a cooking container from below.

  Conventionally, in the field of gas stoves, various attempts have been made to improve the heating efficiency of cooking containers. For example, in Patent Document 1, the flame ejection direction of the burner's flame mouth is set to be inclined at a predetermined angle in the circumferential direction of the burner with respect to the straight line connecting the burner center and the flame mouth, and a support arm (Gotoku nails) that supports the cooking container is set. ) Is set at a predetermined angle in the circumferential direction of the burner with respect to the straight line connecting the center of the burner and the tip of the support arm to increase the contact length between the flame and the bottom of the pan to improve the thermal efficiency. It is disclosed.

JP 2003-166718 A

In the gas stove as in Patent Document 1, only the flame ejection direction is oblique, and most of the combustion gas flows in the lateral direction (radiation direction from the burner) without colliding with the support arm. Therefore, the contact between the combustion gas and the bottom surface of the cooking vessel becomes insufficient, and improvement in thermal efficiency due to heat exchange between the combustion gas and the cooking vessel cannot be expected.
Therefore, the present inventors have already invented a gas stove that forms a gorgeous claw composed of a spiral wall on the upper surface of the gorgeous ring and swirls while causing the combustion gas to collide with the side surface of the gorgeous claw and changing the flow upward. is doing. However, in this structure, a problem arises in that boiled broth easily accumulates in the combustion gas passage between the five virtue claws and obstructs the flow of the combustion gas by closing the combustion gas passage.

  Accordingly, an object of the invention according to claim 1 is to provide a gas stove that eliminates the blockage of the combustion gas passage between the guide walls due to the broth and allows sufficient heat exchange with the cooking vessel by swirling the combustion gas. And

In order to achieve the above object, the invention according to claim 1 includes a turning guide for turning the heat flow generated from the burner on the bottom surface of the cooking container, and the turning guide includes a plurality of arcuate guides in contact with the bottom surface of the cooking container. The wall is arranged in a spiral shape, and is configured to discharge the combustion gas to the outside while being swung by colliding with the guide wall, and in the formation range of the guide wall that becomes the swirl region of the heat flow, The lower part is opened so as not to receive the broth.
In addition to the object of the first aspect, the second aspect of the present invention provides the guide wall with the heat flow at the lower end of the guide wall in order to reliably move the combustion gas for each combustion gas passage even when the lower portion is opened. It is set to a height that does not flow down over the road.
In addition to the object of the second aspect, the invention described in claim 3 is the height of 10 mm or more in order to obtain the optimum height of the guide wall.

According to the first aspect of the present invention, the combustion gas passage between the guide walls due to the broth is obstructed, and the contact with the cooking container is improved by the swirling of the combustion gas, and the contact distance becomes long and sufficient. Heat exchange is possible. Therefore, the improvement of the effective thermal efficiency by combustion gas can be expected.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the combustion gas can surely flow along the guide wall even when the lower portion of the guide wall is opened. Independent heat flow is maintained.
According to the invention described in claim 3, in addition to the effect of claim 2, the optimum height of the guide wall can be selected.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of a table stove 1 that is an example of a gas stove. A juice pan 4 is placed on the outer periphery of an opening 3 formed in the top plate 2, and a stove burner 20 is placed at the center of the opening 3. Is arranged. 5 is a virtue placed on the periphery of the opening 3, and the cooking container P is placed on the 5 virtue 5.
The stove burner 20 is an all-primary air type burner that sucks most of the air necessary for combustion as primary air, and has a cylindrical burner body 21 having a flange 22 around its upper end, and a number of flame outlets 24 on the outer periphery. .. And a cylindrical burner head 23 having a cylindrical shape. An air supply fan 6 for supplying combustion air is connected to the burner body 21 upstream, and a gas nozzle 8 for ejecting fuel gas is provided in the middle of the air supply path 7. The gas pipe connected to the gas nozzle 8 includes, from the upstream side, a magnet solenoid valve 9 serving as a safety valve, a main valve 10, and a needle valve 11 that adjusts the gas flow path by a heating power adjustment lever 12 provided in front of the table stove 1. Each is provided.

Reference numeral 13 denotes a controller that controls the operation of an igniter (not shown) upon receiving an ignition operation, and also monitors a temperature sensor (thermocouple or the like) (not shown) provided in the vicinity of the burner during combustion of the burner 20 to detect the magnet solenoid valve 9. The energization control is performed.
Further, the outer periphery of the burner body 21 below the flange 22 of the stove burner 20 and the lower surface of the juice receiving tray 4 are covered with a heat insulating material, for example, ceramic wool 14, 14,.

As shown in FIG. 2, the burner head 23 has a cylindrical inner ring 25 in which a lower end around which the flange portion 26 is provided is placed in a recess 27 that is recessed in the upper surface of the burner body 21, and the upper end is closed. (Right end in FIG. 2) and a cylindrical body that is slightly larger than the inner ring 25, and has a double cylinder structure with an outer ring 28 (center in FIG. 2) that is coaxially mounted on the inner ring 25. In this overlapped state, both rings 25 and 28 are substantially in close contact.
First, the inner ring 25 is made of brass, and circumferential slit grooves 29, 29,... Having a V-shaped cross section are formed on the outer peripheral surface at equal intervals in the vertical direction, and at the bottom of each slit groove 29, Square small holes 30 are formed at equal intervals. The small holes 30 are aligned in the vertical direction between the slit grooves 29. Specifically, a ring body in which vertical grooves 25a, 25a,... In the vertical direction are formed at equal intervals on the inner peripheral surface is formed by forging, and a slit groove 29 is turned on the outer peripheral surface of the ring body in the circumferential direction. It is produced by forming. That is, the portion where the vertical groove 25 a and the slit groove 29 overlap is the small hole 30.

Next, the outer ring 28 is made of heat-resistant stainless steel, and the vertical slit openings 31, 31... Are formed at equal intervals in the circumferential direction.
In a state where the outer ring 28 is externally mounted on the inner ring 25, as shown at the left end of FIG. 2, the small holes 30, 30,... Of the inner ring 25 and the slit openings 31, 31,. Both rings are positioned so that the small holes 30 of the inner ring 25 cannot be seen from the outside. With this arrangement, the burner head 23 reaches the slit opening 31 of the outer ring 28 from the small hole 30 of the inner ring 25 through the slit groove 29 of the inner ring 25 as shown in the enlarged view in the circle of FIG. A mixed gas passage 32 is formed, and a portion overlapping with the mixed gas passage 32 in the slit opening 31 is a flame opening 24.

On the other hand, as shown in FIG. 3, the five virtues 5 serving as turning guides are eight guides that are vertically arranged by forming a strip-shaped plate body having the same width (here 10 mm) from the inner peripheral side to the outer peripheral side in a curved shape. A cross-section that connects the inner edges 16 of the walls 15, 15, the inner edges of the guide walls 15, and the outer edges of the guide walls 15 to be concentric with the inner rings 16. An L-shaped outer connecting ring 17 is formed. Therefore, the five virtues 5 open the lower part between the guide walls 15. Reference numeral 18 denotes a fixed leg that is provided on the lower surface of the outer connecting ring 17 and is inserted and fixed to the periphery of the opening 3.
In addition, the guide walls 15 are arranged in the same direction so as to form a spiral shape with the conoburner 20 as the center, and the upper and lower connection rings are made to coincide with each other so that the cooking container P can be placed thereon. It is connected between 16 and 17 and serves as a virtuosity claw.

Therefore, between the respective guide walls 15, 15, spiral combustion gas passages 19, 19... Passing from the inner peripheral side to the outer peripheral side of the virtues 5 are formed. With the setting of 15 curved shapes, each combustion gas passage 19 is gradually narrowed from the inner periphery to the outer periphery.
The guide walls 15, 15... Are arranged so as to be formed in at least two rows in a circle having a radius of 100 mm from the center of the stove burner 20.

  On the other hand, a swirl vane ring 35 made of heat-resistant stainless steel is placed on the flange 22 of the stove burner 20. The swirl vane ring 35 includes a small ring plate 36 that expands in a trumpet shape from the inner periphery to the outer periphery, and a plurality of swirl blades 37 as lift prevention plates that are erected vertically on the small ring plate 36. , 37...

As shown in FIGS. 3 and 4, the swirling blades 37 are formed in an arc shape when viewed from the top, like the guide wall 15 of Gotoku 5, and each of the swirling blades 37 has a spiral shape around the conoburner 20. Arranged together, the revolving blades 37, 37 are connected to the combustion gas passage 19 of Gotoku 5. Further, the inner end of the swirl vane 37 is formed so as to be located within 2 mm and within 20 mm (10 mm in this embodiment) from the flame mouth forming surface of the burner head 23 (the outer peripheral surface of the outer ring 28). If it is less than 2 mm, it is too close to the flame opening 24 to deteriorate the combustion performance, and if it exceeds 20 mm, the lift preventing effect cannot be sufficiently obtained.
As a result, the combustion flame ejected from the flame opening 24 of the burner head 23 is turned obliquely upward between the swirling blades 37 and 37 of the swirling blade ring 35 and swung in the tangential direction of the cylindrical outer peripheral surface of the burner head 23. Thus, the combustion gas passage 19 of the five virtues 5 and a series of combustion guide passages 38, 38,... Are formed.

In the table stove 1 equipped with the stove burner 20 configured as described above, when the cooking container P is placed on the guide walls 15, 15. A space is formed, and the stove burner 20 and the outer peripheral side of Gotoku 5 are in communication with each other through the combustion guide passage 38 between the swirl vanes 37 and 37 and the combustion gas passage 19 between the guide walls 15 and 15.
When an ignition button (not shown) provided in front of the table stove 1 is pressed here, the main valve 10 and the magnet electromagnetic valve 9 are forcibly opened, and fuel gas is supplied to the stove burner 20. At the same time, the controller 13 rotates the air supply fan 6 to supply combustion air to the burner 20, and also operates the igniter to perform ignition control.

  The fuel gas mixed with the combustion air in the middle of the air supply path 7 becomes a mixed gas, moves up in the burner body 21, and is sent to the burner head 23. In the mixed gas passage 32 of the burner head 23, as shown in the enlarged view in a circle of FIG. 2, first, after being jetted into the slit groove 29 through the small hole 30 of the inner ring 25, the mixed gas is here sent to the slit groove 29. It is divided into right and left inside, is ejected to the outside through the slit opening 31, and the combustion flame F is formed at each flame opening 24 in the slit opening 31. At this time, even if the outermost portion is the slit opening 31 having a large opening area, in each mixed gas passage 32, the mixed gas collides with each other in the slit groove 29 and becomes a turbulent flow. It is possible to prevent the combustion flame F from backing into the burner head 23 or lifting from the flame opening 24 and maintain a good combustion state. Furthermore, since the mixed gas passage 32 is narrowly formed using the slit groove 29, the flame holding property can be further improved. In addition, by using the slit groove 29, it is possible to easily form a narrow gas passage without using precise processing, so that the manufacturing cost can be suppressed.

And here, by forcibly supplying the combustion air by the air supply fan 6, even in the case of the same combustion amount, the combustion space can be narrowed and the thermal efficiency can be improved.
In other words, when combustion air is supplied to natural draft force, if the combustion space is narrowed, draft force is not formed, and combustion air is not supplied or exhausted smoothly. In this case, since the combustion air is forcibly supplied by the air supply fan 6, a good combustion state can be obtained even if the combustion space is narrowed.

  If combustion air is increased and combustion is improved in this way, the ejection speed of the mixed gas increases and the combustion flame is easily lifted. Here, however, the combustion flame F ejecting and burning from each flame port 24 is immediately outside. The combustion flame F does not lift from the burner head 23 because it makes contact with the swirl blades 37, 37,... Of the swirl blade ring 35. It is formed. Therefore, the combustion gas is also led directly to the outer periphery of the swirl vane ring 35 through the combustion guide passage 38 between the swirl vanes 37.

  Subsequently, the combustion gas flows into the plurality of combustion gas passages 19, 19... Which are divided in a spiral shape on the virtues 5 and moves to the outer periphery in a spiral shape while colliding with the guide wall 15. At the time of the collision with the guide wall 15, the combustion gas changes its flow from the horizontal direction to the upper direction and collides with the bottom surface of the cooking container P. For this reason, the contact between the bottom surface of the cooking container P and the combustion gas becomes good, and the contact distance becomes long, so that the heat transfer efficiency can be improved.

Since the lower portion of the guide wall 15 is open except for the inner and outer connecting rings 16 and 17, even if the soup is applied to the virtues 5 due to the boiling of the cooking container P or the like, It passes through the space or along the guide wall 15 and hangs downward and is received by the juice receiving tray 4. Therefore, there is no possibility that the combustion gas passage 19 is blocked by the broth. Further, since the guide wall 15 is formed with a sufficient height (10 mm), the combustion gas moving through the combustion gas passage 19 does not flow over the lower end of the guide wall 15 and flows downward. Independence of the heat flow for each passage 19 is maintained.
Furthermore, since the guide wall 15 is erected in two or more rows within a circle having a radius of 100 mm from the center of the stove burner 20, heat exchange with the combustion gas can be reliably performed even in a cooking vessel having a small diameter.

  Thus, according to the table stove 1 of the said form, the turning guide (5 morals 5) which turns the heat flow which generate | occur | produced from the stove burner 20 on the cooking vessel P bottom face is provided, and the turning guide touches the cooking vessel P bottom face. Are arranged in a spiral shape so that the combustion gas collides with the guide wall 15 to be swirled and discharged to the outside, and becomes a swirl region for heat flow. In the formation range of the guide wall 15, the lower portion is opened so as not to receive the broth from above, so that the blockage of the combustion gas passage 19 due to the broth is eliminated, and the cooking container P by the swirling of the combustion gas is used. It is possible to sufficiently exchange heat with. Therefore, an effective improvement in thermal efficiency can be expected.

  Further, since the guide wall 15 is set to a height (10 mm) at which the heat flow does not flow over the lower end of the guide wall 15 and flows downward, turbulent flow is generated in the combustion gas even if the lower portion of the guide wall 15 is opened. And independent heat flow in each combustion gas passage 19 is maintained.

In addition, Gotoku is not limited to the one that opens almost the entire guide wall as in the above-mentioned form, but partially forms through holes or opens only the outer peripheral side where the broth is likely to be applied. You can keep it open. Further, the guide wall is not limited to a spiral shape in which the outer peripheral side passage is narrowed as in the above-described embodiment, but may be a spiral shape in which the outer peripheral side passage is widened, and the specific shape can be changed as appropriate. Further, the number of guide walls can be increased or decreased, and the height can be set to exceed 10 mm.
On the other hand, the guide walls are not limited to the inner and outer connecting rings of the above-described form, and the guide walls may be connected to each other by connecting the guide walls in the form of vertical strips like the guide walls, or adjacent to the guide walls. A plurality of plates or rods that connect each other may be provided.

In addition, the swirl vane ring may be omitted and the virtues may be made wider on the inner circumference side, and the burner head is not limited to the one with the double cylinder structure as in the above-described form, and a flame outlet is provided on the outer circumference. Other structures such as a conventional outer-facing flame burner can also be used. Of course, the present invention can be applied not only to the table stove but also to other gas stoves such as a built-in stove.

It is explanatory drawing of a table stove. It is explanatory drawing of a burner head. It is a top view of a stove part. It is explanatory drawing (a top is a plane and the bottom is an AA line cross section) of a turning blade ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Table stove, 5 ... Five virtues, 6 ... Supply fan, 13 ... Controller, 15 ... Guide wall, 16 ... Inner connecting ring, 17 ... Outer connecting ring, 19 ... Combustion gas passage, 20 ... Stove burner, 21 ... Burner Main body, 23... Burner head, 24. Flame port, 35. Swivel blade ring, 36. Small ring plate, 37. Swivel blade, P.

Claims (3)

A gas stove equipped with a burner for heating the cooking container from below,
A swivel guide for swirling the heat flow generated from the burner on the bottom surface of the cooking vessel, the swivel guide having a plurality of arcuate guide walls in contact with the bottom surface of the cooking vessel, arranged in a spiral shape, and combustion gas in the guide wall It is configured to discharge outside while swirling by colliding, and in the formation range of the guide wall that becomes the swirl region of the heat flow, the lower part is opened so as not to receive boiled juice from above Gas stove.   The gas stove according to claim 1, wherein the guide wall is set to a height at which the heat flow does not flow downward over the lower end of the guide wall. The gas stove according to claim 2, wherein the height of the guide wall is 10 mm or more.

Images