JP2022186104A - Gas cooking stove - Google Patents

Abstract

To provide a gas cooking stove which can perform low temperature cooking without needing a user to repeat ignition and fire extinction of a cooking stove burner continually.SOLUTION: A burner head 22 of a cooking stove burner 2 is divided into multiple divided head areas 22a in a circumferential direction. An outer peripheral surface of each divided head area is formed with air outlets 232 located above flame holes 231. A gas cooking stove includes air supply means 26 each of which may separately supply air to the air outlet 232 of each divided head area 22a. In low temperature cooking control, switching control between air supply to the air outlet 232 by the air supply means 26 and stop of the supply is separately performed for each divided head area 22a. Specifically, each divided head area 22a, in which air is supplied to the air outlets 23a2 by the air supply means 26, is set as an air supplied divided head area, and the number of the air supplied divided head areas is changed with a fuel gas supply amount maintained at a predetermined amount.SELECTED DRAWING: Figure 3

Description

The present invention provides a gas stove comprising a stove burner having an annular burner head, gas amount adjusting means for adjusting the amount of fuel gas supplied to the stove burner, control means, and low temperature cooking instruction means for instructing a low temperature cooking mode. Regarding.

Conventionally, as this type of gas stove, for example, according to Patent Document 1, when a low-temperature cooking mode in which the object to be heated is heated to about 100 ° C. or lower than 100 ° C. is instructed by the low-temperature cooking instruction means, low-temperature cooking control is performed. It is known to configure the control means so as to Here, in the low-temperature cooking control, the ignition of the stove burner is frequently repeated.

However, if the stove burner is frequently turned off during low-temperature cooking, the user may feel uncomfortable.

JP 2019-90544 A

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a gas stove that enables low-temperature cooking to be performed without frequently repeating turning on and off the stove burner.

In order to solve the above problems, the present invention provides a stove burner having an annular burner head, gas amount adjusting means for adjusting the amount of fuel gas supplied to the stove burner, control means, and a low temperature cooking mode. and a low-temperature cooking instruction means, wherein the stove burner has a large number of first flame ports formed on the outer peripheral surface of the burner head, and a first mixing pipe continuing upstream of the first flame ports. In one burner section, the fuel gas is supplied from the gas amount adjusting means to the first burner section, wherein the burner head is divided into a plurality of sectioned head areas in the circumferential direction, and the outer circumference of each sectioned head area The surface is formed with an air outlet located above the first flame port, the gas stove includes an air supply means capable of separately supplying air to each head area divided into the air outlet, and the control means is configured to perform low temperature cooking. When a low-temperature cooking mode is instructed by the instruction means, low-temperature cooking control is executed, and in the low-temperature cooking control, air is supplied and stopped to the air outlets by the air supply means individually for each divided head area. or control to increase or decrease the amount of air supplied to the air outlet by the air supply means.

According to the present invention, in the low-temperature cooking control, the air from the air supply means is ejected through the air outlet above the combustion flame formed in the first flame port of the burner head, and the combustion flame is affected by the air. This air can reduce the amount of heat transmitted to the object to be heated. Accordingly, low-temperature cooking can be performed without frequently repeating the lighting and extinguishing of the stove burner (first burner section), and it is possible to prevent the user from feeling discomfort. Further, for each divided head region, switching control between supply and stop of supply of air to the air outlet by the air supply means, or increase/decrease control of the amount of air supplied to the air outlet by the air supply means is executed. Thus, the amount of heat transferred to the object to be heated can be finely adjusted.

For example, in the low temperature cooking control, while maintaining the fuel gas supply amount to the first burner portion at a predetermined amount, Varying the number of charge segmented head regions. According to this, it is possible to change the amount of heat transferred to the object to be heated in stages without changing the amount of fuel gas supplied to the first burner portion, thereby improving the cooking performance.

Further, in the low-temperature cooking control, in a state in which a part of the plurality of division head areas is used as the air supply division head area, it is desirable to change the circumferential position of the air supply division head area over time. According to this, even if the amount of heat transmitted to the object to be heated is reduced in the portion matching the air supply division head region and the heating distribution of the object to be heated at each time point becomes uneven, the amount of heat transferred to the object to be heated is reduced in the total time. The heating distribution of the object becomes uniform, and uneven heating can be eliminated.

Further, in the present invention, the stove burner includes, in addition to the first burner portion, a second flame port composed of an air outlet, and each second mixing pipe connected upstream of the second flame port in each sectioned head region. The second burner section may comprise a forced air supply type burner in which air from the air supply means is supplied as primary air to each of the second mixing tubes. In this case, there is a single combustion state in which the fuel gas is supplied only to the first burner portion to burn only the first burner portion, and a single combustion state in which the fuel gas is supplied to the second burner portion to burn both the first and second burner portions. A switching means may be provided for switching between the simultaneous combustion state and the low-temperature cooking control, and the switching means may be used to switch to the single combustion state. According to this, by setting the simultaneous combustion state, the heating amount of the object to be heated can be increased and the turndown ratio can be increased, thereby widening the range of feasible cooking.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the principal part of the gas stove of embodiment of this invention. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1; The perspective view of the stove burner provided in the gas stove of embodiment. 4 is a plan view of the stove burner cut along line IV-IV of FIG. 3; FIG. FIG. 5 is a cut front view of the stove burner cut along line VV in FIG. 4; (a) A perspective view of the stove burner from which the lower body member has been removed, viewed obliquely from below, (b) A perspective view of the lower body member viewed from obliquely above. The flow figure which shows the content of the low temperature cooking control performed with the gas stove of embodiment.

1 and 2, the gas stove according to the embodiment of the present invention includes a stove burner 2 facing a burner opening 11 formed in a top plate 1 covering the upper surface of a stove main body (not shown). The stove burner 2 has a burner body 21 whose upper part is inserted into the burner opening 11 and an annular burner head 22 on the burner body 21 . A trivet 12 is placed on the top plate 1 so as to surround the burner opening 11, and a cover covers from above the gap between the burner opening 11 and the portion of the burner body 21 inserted therein. A ring 13 is mounted.

3 to 6, the stove burner 2 includes a large number of _first flame ports 23-1 formed on the outer peripheral surface of the burner head 22, and a first mixing pipe connected to the upstream side of the _first flame ports 23-1. _{24-1 .} The burner head 22 is circumferentially divided into four divided head regions 22a of #1 to #4. A _second flame port 23-2 consisting of a plurality of openings located above the _first flame port 23-1 is formed on the outer peripheral surface of each division head region 22a. In addition to the _first burner portion 2-1, the stove burner 2 includes a _second flame port 23-2, and a #1 burner connected to the upstream side of the _second flame port 23-2 of each of the divided head regions 22a of #1 to #4. It is equipped with a _second burner section 22 having _second mixing tubes 242 of .about.#4.

More specifically, the burner body 21 includes an upper body member 211 having an outer cylindrical body 211a and an inner cylindrical body 211b which are inserted into the burner opening 11, and four second mixtures #1 to #4. The _lower body member 212 is integrally formed with the tube 242 , and the upper body member 211 is attached to the central portion of the upper surface of the lower body member 212 . The burner head 22 is formed with an annular lower head member 221 having a cylindrical portion 221a vertically provided on its inner circumference to fit the inner cylindrical body 211b of the upper body member 211, and a central portion of the lower body member 212 on its inner circumference. and an annular upper head member 222 vertically provided with a cylindrical portion 222a that fits into the through hole 212a.

A ring-shaped wall 221 b is vertically provided on the outer peripheral portion of the lower surface of the lower head member 221 and is seated on the upper end of the outer cylinder 211 a of the upper body member 211 . The annular wall 221b is provided with a number of grooves that are recessed upward from the lower end surface thereof and serve as the _first flame ports 231 at intervals in the circumferential direction. The _first flame port 231 communicates with a space defined between the tubular portion 221a of the lower head member 221, the inner tubular body 211b of the upper body member 211, and the outer tubular body 211a of the upper body member 211. A _first mixing pipe 241 integral with the upper body member 211 is provided so as to communicate with this space.

Further, an annular wall 222 b is vertically provided on the outer peripheral portion of the lower surface of the upper head member 222 so as to be seated on the outer peripheral portion of the upper surface of the lower head member 221 . The annular wall 222b is formed with a number of grooves which are recessed upward from the lower end surface thereof and serve as _second flame ports 232 at intervals in the circumferential direction. Furthermore, as shown in FIG. 6(a), on the lower surface of the upper head member 222, there is a cylindrical portion 222a of the upper head member 222 and a cylindrical portion 221a of the lower head member 221 which are connected to the _second flame port 232. Four radial partition walls 222c are vertically provided for partitioning the space into four portions in the circumferential direction corresponding to the four partitioning head regions 22a of #1 to #4. Further, as shown in FIG. 6(b), on the upper surface of the lower body member 212, arc-shaped pipes are formed so as to surround the through hole 212a and connected to the four _second mixing pipes 242 of #1 to #4, respectively. Four outlets 24 ₂ a are provided. Then, each outlet 24 ₂ a is fitted to the lower end of each space partitioned by the partition wall 222 c , and # 1 to # 4 are positioned upstream of the second flame ports 23 ₂ of the partitioned head regions 22 a of # 1 to # 4 . 1 to #4 of the _second mixing pipes 242 are connected.

A gas nozzle 25 for injecting fuel gas is provided in the middle of each _second mixing tube 242 . Fans 26 of #1 to #4 as air supply means are connected to the inlets of the upstream ends of the _second mixing pipes 242 of #1 to #4. The _second burner section 22 is composed of a forced air supply type burner that supplies air from each fan 26 to each _second mixing tube 242 as primary air. The gas nozzle 25 is held by a nozzle holder 251 attached to each _second mixing tube 242 from the outside. A fuel gas inlet 252 is opened at the outer end of the nozzle holder 251 exposed to the outer surface of each _second mixing tube 242 .

Referring to FIG. 4, a gas nozzle (not shown) facing the inlet at the upstream end of the _first mixing pipe 24-1, that is, the _first burner section 21, is provided with a first burner gas branched from the common gas supply path 3. Fuel gas is supplied through the supply path 31, and the second burner gas branched from the common gas supply path ₃ is supplied to the gas nozzle 25 in each _second mixing tube 242, that is, the _second burner section 22. Fuel gas is supplied via line ₃₂ . The common gas supply line 3 is provided with a safety valve 31 and a flow rate control valve 32 as gas amount control means. Further, in the second burner gas supply path 3 ₂ , a single combustion state in which fuel gas is supplied only to the first burner section 2 ₁ and only the first burner section 2 ₁ is burned, and a fuel gas to the second burner section 2 ₂ A second burner electromagnetic valve 33 is interposed as switching means for switching between a simultaneous combustion state in which both the first and second burner portions 2 ₁ and 2 ₂ are burned by supplying fuel gas.

The stove burner 2 is also provided with an ignition electrode 27 for igniting the _first burner portion 2-1 and a thermocouple 28 for detecting combustion flame of the _first burner portion 2-1. Furthermore, the burner head 22 has a pan bottom temperature sensor 29 as a temperature detecting means for detecting the temperature of the object to be heated placed above the stove burner 2, that is, the object to be heated (cooking vessel) placed on the trivet 12. It is provided to project upwardly through the enclosed space.

The safety valve 31, the flow control valve 32, the second burner solenoid valve 33, the fan 26, and the igniter (not shown) that applies a high voltage to the ignition electrode 27 are controlled by a controller 4 comprising a microcomputer as control means. In the controller 4, signals from the ignition extinguishing operation unit 41, the heating power adjustment operation unit 42, and the cooking mode selection unit 43 provided on the operation panel (not shown), the signal from the pot bottom temperature sensor 29, and the signal from the thermocouple 28 is entered. When the ignition command signal is input from the ignition/extinguishing operation unit 41 , the controller 4 opens the safety valve 31 and turns on the igniter to ignite the _first burner unit 21 . After that, when a misfire is detected based on the signal from the thermocouple 28 or when a fire extinguishing command signal is input from the ignition/extinguishing operation unit 41, the safety valve 31 is closed.

When the manual cooking mode is selected by the cooking mode selector 43 , the flow control valve 32 is controlled based on the signal from the heating power control operating section 42 . When a heating power of a predetermined intermediate heating power or higher is indicated by the heating power adjustment operating section 42, the solenoid valve 33 for the second burner is opened to burn both the _first and _second burner sections 21 and 22 at the same time. After switching to the combustion state, each fan 26 is driven to supply an amount of air corresponding to the amount of fuel gas supplied to the _second burner section 22 . Further, when an automatic cooking mode other than the low-temperature cooking mode, which will be described later, is selected by the cooking mode selection unit 43, the temperature of the object to be heated detected by the pan bottom temperature sensor 29 falls within a predetermined set temperature range corresponding to the cooking mode. The flow control valve 32, the second burner electromagnetic valve 33 and the fans 26 are controlled as follows.

Here, in the cooking mode selection unit 43, as one of the automatic cooking modes, it is possible to select a low temperature cooking mode in which the object to be heated is heated at a temperature of about 100°C or lower than 100°C. Therefore, the cooking mode selector 43 also functions as low temperature cooking instruction means for instructing the low temperature cooking mode. The controller 4 executes low-temperature cooking control when the low-temperature cooking mode is instructed by a signal from the cooking mode selection unit 43 . In the low-temperature cooking control, a single combustion state is set in which only the _first burner portion 21 is burned, and air supply to the _second flame port 232 by the fan 26 and supply stop are individually controlled for each divided head region 22a. Execute switching control. Here, when air is supplied to the _second flame port 23-2, the air is ejected from the _second flame port 23-2 above the combustion flame formed in the _first flame port 23-1, and the combustion flame is heated. This air can reduce the amount of heat transferred to the object. Therefore, low-temperature cooking can be performed without frequently repeating the lighting and extinguishing of the _first burner portion 21, and it is possible to prevent the user from feeling discomfort.

The low-temperature cooking control will be described in detail below with reference to FIG. In the low temperature cooking control, first, in STEP 1, the solenoid valve 33 for the second burner is closed, and the fuel gas is supplied only to the _first burner portion 21 to create a single combustion state in which only the _first burner portion 21 is burned. At the same time, in STEP 2, the flow control valve 32 is controlled so that the fuel gas supply amount Qg to the _first burner section 21 becomes a predetermined amount, for example, the minimum amount that does not cause misfire. Next, with the division head region 22a supplying air from the fan 26 to the _second flame port 232 as the air supply division head region, the indicated heating power (the object to be heated) is issued based on the temperature detected by the pot bottom temperature sensor 29. Control is performed to change the number of air supply division head regions according to the amount of heating. This control will be described in detail below.

The indicated heat power output in the low-temperature cooking control is divided into four stages from maximum "4" to minimum "1". Here, even if the amount of fuel gas supplied to the _first burner section 21 is maintained at the predetermined amount, the heating amount of the object to be heated increases or decreases according to the increase or decrease in the number of the air supply division head regions. If the indicated thermal power is "4", proceed to STEP 4 via STEP 3, and set the number of air supply division head areas to 1. If the indicated thermal power is "3", proceed to STEP 6 via STEPs 3 and 5. , If the number of air supply division head areas is 2 and the indicated thermal power is "2", proceed to STEP 8 via STEPs 3, 5 and 7, and set the number of air supply division head areas to 3 and the indicated thermal power is "1" , the process advances to STEP 9 via STEPs 3, 5, and 7, and sets the number of air supply division head areas to four.

Although not shown in FIG. 7, some of the four division head regions 22a #1 to #4 are used as air supply division head regions, that is, the number of air supply division head regions is three. The following conditions change the circumferential position of the air charge segmentation head region over time. Specifically, when the number of air supply division head regions is set to 1, the air supply division head regions are set to, for example, the #1 division head region 22a, the #2 division head region 22a, Setting the division head region 22a to #3, setting the division head region 22a to #4, and setting the division head region 22a to #1 again are repeated at regular time intervals. Further, when the number of the air supply division head regions is set to 2, the air supply division head regions are set to the division head regions 22a of #1 and #3 and the division head regions 22a of #2 and #4, for example. Repeat at regular intervals. Further, when the number of air supply division head areas is set to 3, the air supply division head areas are set to the division head areas 22a of #1, #2 and #3, and #2, #3 and #4. The division head regions 22a, the division head regions 22a of #3, #4, and #1, the division head regions 22a of #4, #1, and #2, and again #1, #. 2 and #3 divided head regions 22a are repeated. In this way, if the circumferential position of the air supply division head region is changed over time, even if the heating distribution of the object to be heated at each point becomes uneven, the heating distribution of the object to be heated over the total time can be improved. becomes uniform, and uneven heating can be eliminated.

After starting control to change the number of air supply division head regions as described above, it is determined in STEP 10 whether or not a fire extinguishing command has been issued. Control to change the number of regions is continuously performed. The fire extinguishing command is issued by operating the light extinguishing operation section 41 or by the elapse of the set time for low-temperature cooking. Then, when a fire extinguishing command is issued, the process proceeds to STEP 11, the safety valve 31 is closed, and the _first burner section 21 is extinguished.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above-described embodiment, in the low-temperature cooking control, switching control between supply and stop of supply of air to the _second flame port 232 by the fan 26 is individually performed for each division head region 22a. It is also possible to increase/decrease the amount of air supplied to the _second flame port 232 by . In the above-described embodiment, the four fans 26 #1 to #4 are used as the air supply means capable of individually supplying air to the _second flame port 232 for each of the divided head regions 22a of #1 to #4. The air supply means consists of one fan and valves such as butterfly valves interposed in the respective branch air passages on the downstream side of the fan connected to the _second mixing pipes 242 of #1 to #4. It is also possible to configure

Furthermore, in the above-described embodiment, the stove burner 2 includes the _second burner portion 2-2 in addition to the _first burner portion _2-1 . However, the _second burner portion ₂₂ is not provided, and the burner portion 241 is located above the _first flame port ₂₄₁ . It is also possible to use a stove burner that blows out only the air supplied by the fan 26 from the air outlet (corresponding to the _second flame port 242 in the above embodiment). However, if the stove burner 2 provided with both the first and second burner portions 2 ₁ and 2 ₂ is used as in the above embodiment, the simultaneous combustion state is achieved, thereby increasing the heating amount of the object to be heated and turning Down ratio can be increased. Therefore, the range of feasible cooking is expanded, which is advantageous.

In the above _- described embodiment, the common gas supply path ₃ is provided with the flow control valve 32 as the gas amount adjustment means. A gas amount adjusting means for adjusting the supply amount may be provided, and a gas amount adjusting means for adjusting the fuel gas supply amount to the _second burner section 22 may be provided in the _second burner gas supply path 32. Further, when a heating power lower than a predetermined intermediate heating power is instructed by the heating power adjusting operation section 42, it may be determined that the low temperature cooking mode has been instructed, and the low temperature cooking control described above may be performed. In this case, the thermal power adjustment operating section 42 functions as low temperature cooking instruction means. Moreover, in the above embodiment, the number of the divided head regions 22a of the burner head 22 is four, but the number may be other than four.

DESCRIPTION OF SYMBOLS 2 -- Stove burner 2 ₁ -- First burner section 2 ₂ -- Second burner section 22 -- Burner head 23 ₁ -- First flame port 23 ₂ -- Second flame port (air outlet) 24 ₁ -- First mixing pipe 24 ₂ Second mixing pipe 26 Fan (air supply means) 32 Flow control valve (gas amount control means) 33 Solenoid valve for second burner (switching means) 4 Controller (control means), 43 ... cooking mode selection section (low temperature cooking instruction means).

Claims (4)

A gas stove comprising a stove burner having an annular burner head, gas amount adjusting means for adjusting the amount of fuel gas supplied to the stove burner, control means, and low temperature cooking instruction means for instructing a low temperature cooking mode,
The stove burner includes a first burner portion having a number of first flame ports formed on the outer peripheral surface of the burner head and a first mixing pipe continuing upstream of the first flame ports. In the one in which the fuel gas is supplied from the amount adjusting means,
The burner head is divided into a plurality of sectioned head regions in the circumferential direction, and an air outlet located above the first flame port is formed on the outer peripheral surface of each sectioned head region,
The gas stove is equipped with an air supply means capable of supplying air to each divided head area individually at the air outlet,
The control means is configured to execute low-temperature cooking control when a low-temperature cooking mode is instructed by the low-temperature cooking instruction means. In the low-temperature cooking control, the air supply means supplies air to the air outlets individually for each of the divided head regions. What is claimed is: 1. A gas stove that performs switching control between supplying and stopping air supply, or increasing/decreasing control of the amount of air supplied to an air outlet by an air supplying means. In the low-temperature cooking control, the amount of fuel gas supplied to the first burner portion is maintained at a predetermined amount in the low-temperature cooking control, with the division head area supplying air from the air supply means to the air outlet as the air supply division head area. 2. The gas stove according to claim 1, wherein the number of the air supply division head regions is changed while the number of the air supply division head regions is changed. 3. The gas stove according to claim 2, wherein in the low-temperature cooking control, in a state in which a part of the plurality of division head areas is set as the air supply division head area, the circumferential position of the air supply division head area changes with time. A gas stove characterized by changing the The stove burner has, in addition to the first burner portion, a second flame port composed of the air outlet, and second mixing pipes connected to the upstream side of the second flame port of each of the sectioned head regions. Two burner sections are provided, and the second burner section is composed of a forced air supply type burner in which air from the air supply means is supplied as primary air to each of the second mixing tubes, and fuel is supplied only to the first burner section. Switching between a single combustion state in which gas is supplied to burn only the first burner section and a simultaneous combustion state in which fuel gas is also supplied to the second burner section and both the first and second burner sections are burned. 4. The gas stove according to any one of claims 1 to 3, further comprising switching means, wherein the switching means switches to a single combustion state in the low-temperature cooking control.

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