CN105299703B

CN105299703B - Gas furnace

Info

Publication number: CN105299703B
Application number: CN201510283971.6A
Authority: CN
Inventors: 森岛真
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2014-06-02
Filing date: 2015-05-29
Publication date: 2019-02-05
Anticipated expiration: 2035-05-29
Also published as: JP2015227763A; KR101710265B1; JP6058587B2; KR20150138820A; CN105299703A

Abstract

The present invention provides a kind of gas furnace.Control unit (23a) (23b) when overflowing fire is provided on the gas furnace, its output for being based on the UV sensor (18a) (18b) for looking down furnace combustor (2a) (2b) detects when having flame spilling around the cooking-vessel (Wa) (Wb) on furnace combustor (2a) (2b) that control reduces the firepower of furnace combustor (2a) (2b).The outer cover (21) of tubular is set on UV sensor (18a) (18b) and covers the baffle (22) of the side half portion of the top end opening of outer cover (21).The gas furnace can prevent the flame error detection of UV sensor and cause that unnecessary firepower is reduced and ease of use is good.

Description

Gas furnace

Technical field

The present invention relates to automatically adjust furnace combustor when the flame when furnace combustor overflows around cooking-vessel Firepower gas furnace.

Background technique

When being cooked using gas furnace, when the firepower of furnace combustor is excessive, flame can be from the week of cooking-vessel Enclose spilling.When being cooked in the state that flame overflows around cooking-vessel, not only thermal energy causes to waste, but also because The handle temperature of cooking-vessel is excessively high, user coat-sleeve kindling etc., may cause and user is allowed to experience heat.

It is thus known that there is a kind of such as seen gas furnace in patent document 1, existed by detecting furnace combustor The flame overflowed around the cooking-vessels such as pot when burning, the automatic firepower for reducing furnace combustor, thus with fire appropriate Power heats cooking-vessel.

When stating gas furnace in use, by the UV sensor that is arranged on range hood to from furnace combustor On cooking-vessel around the flame that overflows detected.UV sensor is different from infrared ray, will not be heated to high temperature Cooking-vessel heat radiation influence.Therefore, it by using UV sensor, can be detected with high accuracy from cooking-vessel The flame that surrounding is overflowed.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2011-106729 bulletin

Summary of the invention

However, obviously there is no generate for the furnace combustor of a side when two adjacent furnace combustors burn simultaneously Overflow fire, but because UV sensor by another party's furnace combustor flame issue ultraviolet light influenced, error detection occur is The situation of excessive fire.Moreover, the fire for reducing the furnace combustor can be executed when fiery error detection occurs to overflow for UV sensor The unnecessary control of power, causes ease of use to be deteriorated.

In view of the above problems, it is prevented due to the excessive fiery error detection of UV sensor the purpose of the present invention is to provide a kind of Lead to the furnace combustor that firepower is reduced and ease of use is high.

In order to reach above-mentioned purpose, gas furnace of the invention has: two adjacent furnace combustors；To look down at least The UV sensor that the mode of the furnace combustor of one side configures；And control unit when overflowing fiery, it is passed based on the ultraviolet light The output of sensor, whether monitoring has flame spilling around the cooking-vessel on the furnace combustor of a side, when having detected When flame overflows, reduce to the furnace combustor of a side control of firepower, which is characterized in that, described ultraviolet Line sensor has the outer cover and baffle of tubular, and entrance port of the top end opening directed downwardly of the outer cover as ultraviolet light is right The visual field, the top that the baffle passes through the covering outer cover are set around the furnace combustor of one side and the furnace combustor The side half portion of opening is in the furnace combustor of another party outside the visual field, and the side half portion of the top end opening depends on described another party Furnace combustor side.

By the way that the outer cover is arranged on the UV sensor, the visual field of UV sensor is limited in a side's Furnace combustor and its surrounding.Also, the baffle, the stove burning of another party are arranged by the top end opening to the outer cover Device is excluded except the visual field of UV sensor, which can cover the flame production by the furnace combustor of another party The ultraviolet light of the top end opening of raw directive outer cover, so that the ultraviolet light be inhibited to be incident on the inside of the outer cover.Therefore, Neng Goufang The error detection for only leading to UV sensor to flame due to the ultraviolet light of the furnace combustor by another party is influenced.Institute The excessive fire of the furnace combustor of a side can be detected with high accuracy, with control unit when, the excessive fire so as to which prevent need not The firepower wanted is reduced.

In addition, in the present invention, the UV sensor is preferably disposed on the furnace combustor of opposite the party Position directly above leave on the front position of predetermined distance.

According to above-mentioned setting, the side opposite with user is reliably accommodated in the visual field in the outer peripheral surface of cooking-vessel It is interior, the excessive fire of user side generation can be reliably detected out.Therefore, when fire occurs to overflow for user side, by described Control unit carries out the control for reducing firepower rapidly when overflowing fiery, can be avoided the states of affairs such as user contacts flame, coat-sleeve catches fire, reliably Ground prevents user from experiencing heat.

As long as also, side opposite with user in the outer peripheral surface of cooking-vessel is incorporated in the visual field, can will be overflow Fire detects unwanted region (for example, flame with user side opposite side) and is rejected to outside the visual field, by necessary and minimum journey The region of degree is reliably accommodated in the visual field of UV sensor, so that unnecessary ultraviolet light be inhibited to inject ultraviolet light sensing In device.Moreover, largely leaving another party's to the visual field of the UV sensor of the furnace combustor setting of a side The flame with user side opposite side of furnace combustor, therefore can further be reliably prevented the stove due to another party The influence of burner and the error detection for causing ultraviolet light, to improve the excessive fiery detection accuracy to the furnace combustor of a side.

In addition, stopping instruction unit in the present invention, it is preferred to which straight fire is arranged and cooks test section and control, the straight fire, which is cooked, to be examined Survey portion detects cook without using the straight fire of cooking-vessel for each furnace combustor of described two furnace combustors, The straight fire cooks test section in the both sides or in which a side for detecting described two furnace combustors when the straight fire of progress is cooked, The control stops the control that instruction unit stops control unit when the excessive fire.

It is different according to food materials type, it is cooked sometimes using the straight fire of furnace combustor.In this occasion, stove combustion The ultraviolet light that the flame of burner generates is extremely strong, it is possible to which the fire that overflows occurs for control unit judgement when causing to overflow fiery, thereby executing reduction fire The control of power.In addition, control unit is monitored by UV sensor from the cooking-vessel on the furnace combustor of a side when overflowing fiery When whether surrounding has flame spilling, when carrying out the straight fire cooking on the furnace combustor of another party, even if UV sensor leads to It crosses the outer cover and the baffle is excluded the furnace combustor of another party except the visual field, due to the furnace of another party Has the influence for a large amount of ultraviolet light that the flame in the straight fire cooking of burner generates, it is possible to lead to UV sensor erroneous detection It surveys as the fire that overflows.

Therefore, in the present invention, when by it is described it is straight fire cook test section detect two furnace combustors both sides or Wherein for a side when carrying out the straight fire cooking, the control stops the control of control unit when instruction unit stops overflowing fiery.Therefore, when being in The situation or UV sensor erroneous detection unrelated with excessive fire measures under the situation for the fire that overflows, when due to that can prevent the excessive fire The control of control unit causes unnecessary firepower to reduce, and can further increase ease of use.

Detailed description of the invention

Fig. 1 is the schematic elevational view for indicating the embodiment of the present invention.

Fig. 2 is the schematic diagram for indicating the schematic configuration of the mian part of gas furnace of the present embodiment.

Fig. 3 is the schematic side elevation of Fig. 1.

Fig. 4 is the schematic, bottom view of the UV sensor of the present embodiment.

Fig. 5 is the V-V line schematic cross-section of Fig. 4.

Fig. 6 is the schematic plan view of gas furnace.

Fig. 7 is the flow chart of the work of control unit when indicating to overflow fire.

Fig. 8 is to indicate that straight fire cooks the flow chart of the work of test section and control stopping instruction unit.

Symbol description

1 gas furnace

2a furnace combustor

2b furnace combustor

18a UV sensor

18b UV sensor

21 outer covers

22 baffles

Control unit when 23a overflows fiery

Control unit when 23b overflows fiery

The straight fire of 27a cooks test section

The straight fire of 27b cooks test section

28a control stops instruction unit

28b control stops instruction unit

Wa cooking-vessel

Wb cooking-vessel

The visual field Xa

The visual field Xb

Specific embodiment

Based on Detailed description of the invention one embodiment of the invention.In Fig. 1,1 indicates gas furnace.It is provided on gas furnace 1 Pair of right and left furnace combustor 2a, 2b (the first furnace combustor 2a, the second furnace combustor 2b).

In the operation that the point that the front surface of gas furnace 1 is provided with the first furnace combustor 2a of progress stops working and firepower is adjusted The part 3a and operating parts 3b that the point for carrying out the second furnace combustor 2b stops working and firepower is adjusted.Moreover, before gas furnace 1 Surface is provided with the operation panel 4 for having multiple switch (not shown).It is operated by each switch to operation panel 4, energy It is enough that cooking mode (" boil mode ", " fried mode ", " boiling mode ", " high temperature mould are carried out to each furnace combustor 2a, 2b Formula " etc.) carry out setting or time setting etc..

In addition, 5 indicate oven (grill) in Fig. 1,3c expression is put out for carrying out the point of oven burner (not shown) The operating parts that fire and firepower are adjusted.

As shown in Fig. 2, being provided with cooking bottom temperature sensor 7a, 7b on 2b in each furnace combustor 2a.When in range When placing the cooking-vessels Wa, Wb such as bowl on 6a, 6b, cooking bottom temperature the sensor 7a, 7b and cooking-vessel Wa, the bottom surface of Wb It abuts, thus measuring temperature.Cooking bottom temperature sensor 7a, 7b are exerted a force upwards by spring (not shown), are held when with the cooking The bottom surface of device Wa, Wb are moved downwards when abutting, and are formed and cooking-vessel Wa, the state for compressing contact of Wb.Moreover, also setting up The lower in-migration of with good grounds cooking bottom temperature sensor 7a, 7b detect the presence of cooking-vessel Wa, pot the detection switch 8a, 8b of Wb.

As shown in Fig. 2, gas furnace 1 has controller 9.In addition, being set on the pipeline of 10b in each gaspipe 10a Main solenoid valve 11a, 11b and flow control valve 12a, 12b are set.Each gaspipe 10a, 10b are fired to each stove Burner 2a, 2b supply gaseous mixture (gas after primary air and combustion gas mixing).Moreover, being arranged on each furnace combustor 2a, 2b Have for the ignitor 13a, 13b of igniting and for detecting each furnace combustor 2a, the thermocouple 14a whether 2b lights, 14b。

Controller 9 has the function of controlling the first Combustion System portion 15a of the burning of the first furnace combustor 2a and control Make the function of the second Combustion System portion 15b of the burning of the second furnace combustor 2b.From each Combustion System portion 15a, 15b difference is each From various control signals are exported, main solenoid valve 11a, 11b, flow control valve 12a, 12b and igniting are controlled by the signal The work of electrode 13a, 13b.In addition, two flow control valve 12a, 12b are motor-driven valve, using by stepper motor (stepping Motor the aperture of valve body regulating gas the supply pipe 10a, 10b of) 16a, 16b driving.

The corresponding cooking mode set by operation panel 4 of each Combustion System portion 15a, 15b, controls each furnace combustor 2a, 2b, so that each furnace combustor 2a, 2b are in defined combustion state.In addition, each Combustion System portion 15a, 15b According to temperature information, the pot detection switch 8a for coming from cooking bottom temperature sensor 7a, 7b, what 8b was detected indicates whether or not there is cooking-vessel The information of Wa, Wb, to control each furnace combustor 2a, 2b.In addition, usually each Combustion System portion 15a, 15b igniting when by Pot detection switch 8a, 8b detect cooking-vessel Wa, in the absence of Wb, without ignition operation.On the other hand, do not made With cooking-vessel Wa, the straight fire of Wb cooked, can largely move cooking-vessel Wa, and whens the cooking of Wb is cooked etc., user is logical It crosses and selection " high temperature mode " is operable to the switch of operation panel 4, ignition operation is thus allowed for, because without to straight Fire is cooked and the cooking cooking counteracts.

In addition, as shown in Figure 1, being provided with range hood (range hood) 17 in the top of gas furnace 1.In fume eliminating Pair of right and left UV sensor 18a, 18b (the first UV sensor 18a and the second UV sensor are configured on machine 17 18b), it is able to look down each furnace combustor 2a, 2b.

As shown in figure 3, the first UV sensor 18a configuration the position directly above of opposite first furnace combustor 2a from It opens on the front position of predetermined distance.In addition, in Fig. 3 although not shown, the second UV sensor 18b configuration is in opposite second furnace It leaves on the front position of predetermined distance the position directly above of tool burner 2b.

As shown in Figures 4 and 5, the first UV sensor 18a has: shell 20, the shell of storage sensor main body 19 Cylindric outer cover (cover) 21 that 20 position corresponding with the light receiver of sensor main body 19 extends downward and The semilune baffle 22 that one half of the top end opening of outer cover 21 is covered.Shell 20, outer cover 21 and baffle 22 are made of the material that can interdict external ultraviolet light.

Although in addition, only showing the composition of the first UV sensor 18a, the second UV sensor in Fig. 4 and Fig. 5 The composition of 18b is also identical.In addition, outer cover 21 may not be cylinder but form polygonal tubular.

Using each UV sensor 18a, 18b with above-mentioned composition, as shown in fig. 6, can on gas furnace 1 table Face is set substantially at semicircular visual field Xa, Xb.The visual field Xa, Xb respectively correspond each UV sensor 18a, 18b.? That is, the visual field Xa of the first UV sensor 18a is set at the wider of the front area including the first furnace combustor 2a In region, at the same the second furnace combustor 2b and its around do not enter in the Xa of the visual field.Equally, the second UV sensor 18b Visual field Xb be set in the wider region of the front area including the second furnace combustor 2b, while the first stove burn Device 2a and its around do not enter in the Xb of the visual field.

As shown in Fig. 2, each Combustion System portion 15a, 15b have control unit 23a, 23b when overflowing fire as function.Moreover, overflowing Control unit 23a when fiery, 23b have overflow fire test section 24a and firepower adjustment portion 25a, 25b as function.The excessive fiery test section Whether there is or not flame spillings around the cooking container Wa, Wb on furnace combustor 2a, 2b for 24a, 24b monitoring.When the fiery test section that overflows When 24a, 24b have detected excessive fire, firepower the adjustment portion 25a, 25b pass through flow via stepping motor 16a, 16b and adjust Valve 12a, 12b reduce furnace combustor 2a, the firepower of 2b.

As shown in Fig. 2, each UV sensor 18a, 18b be via impulse generator 26a, 26b and the fiery test section 24a that overflows, 24b connection.The intensity of the corresponding ultraviolet light injected of UV sensor 18a, 18b exports electric current.Impulse generator 26a, 26b will The output electric current of UV sensor 18a, 18b are converted into the umber of pulse of unit time.Overflow fire test section 24a, and 24b is to according to arteries and veins Generator 26a is rushed, the umber of pulse that 26b is obtained is counted, when the number of pulses of counting is more than preset threshold value, Xiang Huo Power adjustment portion 25a, 25b output indicates the fiery signal that overflows.

At this moment, as described above, the first UV sensor 18a configuration is in the surface position of opposite first furnace combustor 2a It sets on the front position for leaving predetermined distance, the second UV sensor 18b configuration is just with respect to the second furnace combustor 2b Top position is left on the front position of predetermined distance, and each UV sensor 18a, 18b have outer cover 21 and baffle 22, The visual field Xa of each UV sensor 18a as a result, 18b, Xb are configured to form shown in Fig. 6.It burns as a result, in two stoves In device 2a, 2b burning, adjoint flame overflows ultraviolet from cooking-vessel Wb (referring to Fig. 2) periphery on the second furnace combustor 2b Line is hardly detected by the first UV sensor 18a, and is held with flame from the cooking on the first furnace combustor 2a The ultraviolet light that the periphery (referring to Fig. 2) device Wa is overflowed also hardly is detected by the second UV sensor 18b.

Then, control unit 23a is illustrated the control of the first furnace combustor 2a when just overflowing fiery.As shown in fig. 7, control After device 9 carries out ignition operation in STEP1, STEP2 is subsequently entered, control unit 23a starts to carry out fire control system of overflowing when overflowing fiery.By This, control unit 23a is started by overflowing fire test section 24a via the first UV sensor 18a and impulse generator 26a when overflowing fiery Monitor that whether there is or not excessive fire at the first furnace combustor 2a.

Then in STEP3, STEP4 is entered when excessive fire test section 24a detects the fire that overflows (fire that overflows occurs in judgement), such as Fruit enters STEP5 when not detecting the fire that overflows (fire that overflows occurs in judgement).Specifically, in STEP3, when in three seconds from arteries and veins Umber of pulse obtained by generator 26a sampling is rushed when being counted 10 or more, fire test section 24a judgement of overflowing occurs overflowing fiery.In addition, above-mentioned Umber of pulse is to be placed into the different pot of outer diameter on the first furnace combustor 2a visually to be arrived from the periphery of the pot with each outer diameter There is the umber of pulse being counted when overflowing fiery, and uses count value 10 as threshold value.Therefore, it in STEP3, detects and makees when overflowing fire Setting appropriate is carried out according to ability of the first furnace combustor 2a etc. for the count value of threshold value.

The fire that overflows (fire that overflows occurs in judgement) is detected by the fire test section 24a that overflows in STEP3 and is entered in STEP4, overflow fire When control unit 23a by firepower adjustment portion 25a reduce the first furnace combustor 2a firepower.In STEP4, firepower adjustment portion 25a reduces the firepower of the first furnace combustor 2a, until the umber of pulse being sampled in three seconds from impulse generator 26a is less than 10.

By executing STEP4, the excessive fire of the periphery cooking-vessel Wa on the first furnace combustor 2a is eliminated.As a result, can The cooking of thermal energy is not enough wasted by the first furnace combustor 2a.

Moreover, the first UV sensor 18a configuration leaves rule in the position directly above of opposite first furnace combustor 2a On the front position of set a distance, therefore opposite with user side in the outer peripheral surface of cooking-vessel Wa is reliably accommodated in In the Xa of the visual field.Thus it is possible to reliably detect out the excessive fire of user side generation, by executing STEP4, use can be avoided Person touches the states of affairs such as flame, coat-sleeve kindling, allows user to experience heat to reliably prevent.

In addition, controller 9 enters STEP5, corresponding when not detecting the fire that overflows (fire that overflows occurs in judgement) in STEP3 Judge whether the first furnace combustor 2a has stopped working in end of cooking etc..Also, judge to return to when not stopped working in STEP5 STEP3, it is judged as then entering STEP6 when stopping working, the fire control unit 23a that overflows terminates fire control system of overflowing.In addition, control unit when overflowing fiery 23b is also same as described above to the control of the second furnace combustor 2b.

The gas furnace 1 of the present embodiment has the function that ease of use is improved when fire is overflow in detection.That is, as shown in Fig. 2, The straight fire cooking test section that each Combustion System portion 15a of controller 9,15b as function there is detection to cook in the straight fire of progress 27a, 27b and the control for stopping the control of control unit 23a, 23b when excessive fire stop instruction unit 28a, 28b.When passing through operating surface When selecting " high temperature mode " on furnace combustor 2a, the furnace combustor of at least one party of 2b, straight fire is cooked for the switch operation of plate 4 Test section 27a, 27b is adjusted to stop instruction unit 28a to control, 28b, which is sent, indicates to detect the signal that straight fire is cooked.

Although the visual field Xa of each UV sensor 18a, 18b, Xb is configured to form shown in fig. 6, when by first When the straight fire such as barbecue of furnace combustor 2a progress " high temperature mode " is cooked, without carrying out fiery inspection of overflowing to the first furnace combustor 2a It surveys.Therefore, when straight fire, which cooks test section 27a, to be detected to have carried out the selection of " high temperature mode " to the first furnace combustor 2a, Control stops control of the control unit 23a to the first furnace combustor 2a when instruction unit 28a stops overflowing fiery.

In addition, the excessive fire test section 24a of control unit 23a is to the cooking-vessel on the first furnace combustor 2a when by overflowing fiery In the case that the excessive fire of the periphery Wa is monitored, when being cooked by the straight fire that the second furnace combustor 2b carries out " high temperature mode ", by In without the cooking-vessel etc. on the second furnace combustor 2b, the amount of the ultraviolet light released is more, thus causes first ultraviolet Line sensor 18a detects the ultraviolet light of the second furnace combustor 2b release.Therefore, test section 27a is cooked when straight fire to detect When having selected " high temperature mode " to the second furnace combustor 2b, control stop instruction unit 28a stop overflowing fire when control unit 23a to the The control of one furnace combustor 2a.

That is, according to the flow chart of Fig. 8, as under type illustrates the control that the first furnace combustor 2a cooks straight fire.Such as Shown in Fig. 8, after the first furnace combustor 2a is ignited, straight fire cooks test section 27a in STEP7, detects to the first furnace When at least one party's furnace combustor in tool burner 2a and the second furnace combustor 2b has selected " high temperature mode ", enter STEP8, control of the control unit 23a to the first furnace combustor 2a when stopping overflowing fiery.Then, into STEP9, straight fire cooks detection Portion 27a maintains the halted state of STEP8 until the selection of " high temperature mode " is released from；When the selection of " high temperature mode " is released from When, into STEP10, control unit 23a starts fire control system of overflowing when overflowing fiery.

Although not shown, identical control is also executed to the second furnace combustor 2b.That is, being executed by the second furnace combustor 2b When the straight fire of " high temperature mode " is cooked, detected without the excessive fire to the second furnace combustor 2b.Therefore, when straight fire cooks inspection Survey portion 27b is detected when having selected " high temperature mode " to the second furnace combustor 2b, control stop instruction unit 28b stop overflowing fire when Control of the control unit 23b to the second furnace combustor 2b.

Meanwhile by overflow fire when control unit 23b excessive fire test section 24b to the cooking-vessel on the second furnace combustor 2b It, can when being cooked by the straight fire that the first furnace combustor 2a carries out " high temperature mode " in the case that the excessive fire of the periphery Wb is monitored The second UV sensor 18b can be caused to detect the ultraviolet light of the first furnace combustor 2a release.Therefore, when straight fire cooks inspection Survey portion 27b is detected when having selected " high temperature mode " to the first furnace combustor 2a, control stop instruction unit 28b stop overflowing fire when Control of the control unit 23b to the second furnace combustor 2b.

As noted previously, as there is controller 9 straight fire to cook test section 27a, 27b and control stop instruction unit 28a, 28b Function, under the situation that the fire that overflows is measured in the situation unrelated with excessive fire or UV sensor 18a, 18b erroneous detection, The control of control unit 23a, 23b cause unnecessary firepower to reduce when the gas furnace 1 of embodiment can prevent from overflowing fiery, Neng Goujin One step improves ease of use.

In addition, in the present embodiment, showing each UV sensor 18a, 18b setting to the example on range hood 17 Son.But the setting position of each UV sensor 18a, 18b are not limited only to above-mentioned position, as long as can set shown in fig. 6 The visual field Xa, Xb, such as above-mentioned UV sensor can also be arranged to can look down each furnace combustor 2a, the kitchen of 2b On ceiling etc..

In addition, showing both sides' progress to the first furnace combustor 2a and the second furnace combustor 2b in the present embodiment The example that the fire that overflows detects, can also be using the composition for only carrying out excessive fire detection to the furnace combustor of a wherein side.

Claims

1. a kind of gas furnace, has:

Two adjacent furnace combustors；The UV sensor configured in a manner of the furnace combustor for looking down at least one party； And control unit when overflowing fiery is monitored based on the output of the UV sensor from the cooking on the furnace combustor of a side Whether there is flame spilling around container, when having detected flame spilling, reduction firepower is carried out to the furnace combustor of a side Control, which is characterized in that,

The UV sensor has the outer cover and baffle of tubular, and the top end opening directed downwardly of the outer cover is as ultraviolet The entrance port of line sets the visual field around the furnace combustor and the furnace combustor to a side, and the baffle passes through covering The side half portion of the top end opening of the outer cover is in the furnace combustor of another party outside the visual field, the side half of the top end opening The furnace combustor side of described another party is leaned in portion,

Moreover, UV sensor configuration the position directly above of the furnace combustor of opposite the party leave regulation away from From front position at, thus the front side of the furnace combustor is in the visual field and the rear side of the furnace combustor is in Outside the visual field.

2. gas furnace according to claim 1, which is characterized in that be provided with straight fire cooking test section and control stops referring to Show portion, the straight fire cooks test section and detects not used for each furnace combustor of described two furnace combustors The straight fire of cooking-vessel is cooked, and cooks the both sides or in which one that test section detects described two furnace combustors in the straight fire When carrying out the straight fire cooking, the control stops the control that instruction unit stops control unit when the excessive fire for side.