CN109869749B

CN109869749B - Stove and accessory

Info

Publication number: CN109869749B
Application number: CN201811305258.7A
Authority: CN
Inventors: 竹本安伸
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2017-12-01
Filing date: 2018-11-05
Publication date: 2022-07-05
Anticipated expiration: 2038-11-05
Also published as: JP2019100622A; KR20190065120A; CN109869749A; KR102413998B1; JP6954818B2

Abstract

The invention provides a stove, which can obtain stable ignition performance without causing the operator to be scared even if the primary gas pressure is changed. The stove is provided with: a burner (13); an ignition electrode (7) attached to the burner and igniters (81, 82) for applying a high voltage to the ignition electrode; a gas supply path (3) for supplying gas to the burner; an electric flow rate regulating valve (6) which is provided in the gas supply path and increases or decreases the amount of gas supplied to the burner by increasing or decreasing the opening degree; and a controller (C) for controlling the igniter and the flow rate adjustment valve, wherein when the ignition control of the burner is performed, after the igniter is energized, the controller increases the opening degree of the flow rate adjustment valve so that the amount of gas supplied to the burner is gradually increased.

Description

Stove and accessory

Technical Field

The present invention relates to a stove, comprising: a burner; an ignition electrode attached to the burner and an igniter for applying a high voltage to the ignition electrode; a gas supply path for supplying gas to the burner; an electrically-operated flow rate regulating valve provided in the gas supply path and configured to increase or decrease the amount of gas supplied to the burner by increasing or decreasing the opening degree; and a controller for controlling the igniter and the flow regulating valve.

Background

Conventionally, when ignition control of a burner of such a stove is performed, an igniter is energized and ignited while maintaining an opening degree of a flow rate adjustment valve at an opening degree at which an amount of gas supplied to the burner reaches a predetermined ignition gas amount (see, for example, patent document 1).

In the burner, since the electric flow rate regulating valve is used, the gas amount increases and decreases with the variation of the primary gas pressure, unlike a gas appliance using a proportional valve with a regulator in which the gas amount does not vary even if the primary gas pressure varies. Therefore, the opening degree of the flow rate adjustment valve at the time of ignition control is set to: however, when the primary gas pressure is high, the amount of gas during ignition control increases, and a large flame is generated at the moment of ignition and a large ignition sound is generated, which may lead to a user being scared.

Patent literature

Patent document 1: japanese patent laid-open publication No. 2013-204846

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a burner that can obtain stable ignition performance without causing a user to be startled even when primary gas pressure varies.

In order to solve the above problems, the oven of the present invention includes: a burner; an ignition electrode attached to the burner and an igniter for applying a high voltage to the ignition electrode; a gas supply path for supplying gas to the burner; an electrically-operated flow rate regulating valve provided in the gas supply path and configured to increase or decrease the amount of gas supplied to the burner by increasing or decreasing the opening degree; and a controller for controlling the igniter and the flow control valve, wherein the furnace is characterized in that: when ignition control of the burner is performed, after the igniter is energized, the controller increases the opening degree of the flow rate adjustment valve so that the amount of gas supplied to the burner is gradually increased.

According to the present invention, since the opening degree of the flow rate adjustment valve is gradually increased when the ignition control of the burner is performed, the amount of gas supplied to the burner is gradually increased. Therefore, even when the primary gas pressure fluctuates, the burner is ignited when the amount of gas supplied to the burner reaches a predetermined amount that enables ignition. Therefore, it is possible to suppress the generation of a large flame accompanied by a large ignition sound as in the conventional art, and to obtain a stable ignition performance without causing a user to be scared.

In the present invention, it is preferable that, when the ignition control of the burner is performed, the controller maintains the opening degree of the flow rate adjustment valve at a predetermined opening degree at which a predetermined amount of gas that can achieve ignition is obtained even under a condition that the burner is difficult to ignite, after increasing the opening degree of the flow rate adjustment valve to the predetermined opening degree. In this case, it is possible to suppress an unexpected increase in flame after ignition until the normal combustion control is switched.

In the present invention, it is preferable that the controller increases the opening degree of the flow rate adjustment valve from an opening degree corresponding to a lower limit gas amount that enables stable combustion by the burner, when ignition control of the burner is performed. At this time, it is possible to achieve pre-ignition and reduce the time lag from the start of the ignition operation until the ignition of the burner, as compared with when the flow rate adjustment valve is gradually opened from the fully closed state.

Drawings

Fig. 1 is a schematic perspective view showing one embodiment of a oven according to the present invention.

Fig. 2 is a circuit diagram showing a gas circuit of the furnace shown in fig. 1.

Fig. 3 is a graph showing a relationship between an opening degree of the flow rate adjustment valve and time in association with ignition control by the controller shown in fig. 2.

Description of the reference numerals

1 … stove, 13 … burner, 3 … gas supply circuit, 6 … flow control valve, 7 … ignition electrode, 81, 82 … igniter, C … controller, theta_H、θ_L… the opening degree of the flow regulating valve 6.

Detailed Description

The oven 1 shown in fig. 1 is a built-in oven incorporated in an integral kitchen, not shown. The oven 1 includes: a stove body 11 which is arranged in a manner of being embedded into an opening arranged on the top surface of a cooking bench of the integral kitchen; a top plate 12 mounted on the top surface of the cooktop so as to cover the upper surface of the cooktop main body 11; a total of 3 burners 13, each of which is a front left burner #1, a front right burner #2, and a center rear burner #3, exposed to the top plate 12; and a grill (grill)14 assembled in the oven main body 11. The burner 13 heats an object to be cooked (not shown) in a pot or the like in which the firebar 2 placed on the top plate 12 so as to surround the burner 13 is placed.

As shown in fig. 2, the gas supply path 3 for the burner 1 supplies gas to 3 burners 13, which are #1 to #3 burners shown in fig. 1, and a #4 burner 13, which is provided in the grill 14 and heats an object to be cooked in the grill 14. The main valve 4 is provided on the upstream side of the gas supply path 3, and the gas supply path 3 is branched into 4 branch paths 3a on the downstream side of the main valve 4, and each branch path 3a is connected to 1 of the 4 burners 13. Each branch line 3a is provided with an electromagnetic relief valve 5 and an electric flow rate control valve 6. The flow rate control valve 6 is disposed downstream of the branch line 3a with respect to the electromagnetic relief valve 5. Each flow rate adjustment valve 6 is an electric adjustment valve that is driven by the motor M and adjusts the opening degree. The amount of gas supplied to the combustor 13 through the branch passage 3a is increased or decreased by increasing or decreasing the opening degree of the valve body of the flow rate adjustment valve 6. As the flow rate adjustment valve 6, there can be used: a control valve having a needle valve body which is advanced and retracted in an axial direction by rotation of a motor M via a screw mechanism; or a regulator valve having a disk-shaped rotary valve body rotated by the rotation of the motor M.

Each burner 13 is provided with an ignition electrode 7 and a thermocouple for detecting flame, which is not shown. Further, the oven 1 is provided with: an igniter 81 for applying a high voltage to the ignition electrodes 7 attached to the #1 to #3 burners 13; and an igniter 82 for applying a high voltage to the ignition electrode 7 attached to the #4 burner 13. In the oven 1, the main valve 4, the electromagnetic safety valve 5, the motor M of the flow rate adjustment valve 6, and the

igniters

81 and 82 are controlled by the controller C. For example, a microcomputer or the like can be applied to the controller C.

As shown in fig. 1, the front surface plate 11a of the oven main body 11 includes: a power switch 9; and ignition key-off buttons 100(#1 to #4) that perform ignition and ignition key-off one by one for each of #1 to #4 burners of the burners 13 and that also serve as a fire power adjustment knob. The ignition/flame-off button 100 is a push-type button, and the user pushes the ignition/flame-off button 100 from the flame-off position in which the ignition/flame-off button is retracted into the front panel 11a to release the retracted state, so that the ignition/flame-off button 100 is projected forward of the front panel 11a to be located at the combustion position. In the combustion position, the ignition key-off button 100 is rotatable, and the fire power can be adjusted within a range from a large fire to a small fire by rotating the ignition key-off button 100. Both the pressing operation and the turning operation of the ignition key off button 100 are detected by an operation detection switch D shown in fig. 2. The detection signal output from the operation detection switch D is input to the controller C.

When the power switch 9 is turned on, an on signal is inputted to the controller C, and the oven 1 starts to operate. When the user presses the ignition key-off button 100 existing at the key-off position to perform an ignition operation, a detection signal output from the operation detection switch D is input to the controller C, so that the controller C performs ignition control of the burner 13. In this ignition control, the igniter 81 is energized to apply a high voltage to the ignition electrode 7, and the ignition electrode 7 is caused to continuously generate a spark. When the ignition key-off button 100 for the grill 14 is pressed, the igniter 82 is energized. Next, the controller C outputs an opening signal to the electromagnetic relief valve 5, thereby causing the electromagnetic relief valve 5 to open. In addition, when the ignition control of any one of the burners 13 is performed in a state where any one of the burners 13 is not burned, the main valve 4 is also opened. Then, as shown in fig. 3, the controller C gradually increases the opening degree of the flow rate adjustment valve 6 to gradually increase the amount of gas supplied to the burner 13.

In this way, in the ignition control of the combustor 13 by the controller C, the opening degree of the flow rate adjustment valve 6 is gradually increased at the time of the ignition control of the combustor 13, and therefore, the amount of gas supplied to the combustor 13 is gradually increased. Therefore, even when the primary gas pressure fluctuates, the burner 13 is ignited when the amount of gas supplied to the burner 13 reaches a predetermined amount that enables ignition. Therefore, it is possible to suppress the generation of a large flame accompanied by a large ignition sound as in the conventional art, and to obtain a stable ignition performance without causing a user to be scared. At this time, it is preferable that the opening degree of the flow rate adjustment valve 6 is increased by a certain ratio after the valve is opened. When the thermocouple is heated by ignition and the electromotive force thereof is increased to a predetermined level, the ignition control is terminated, and the operation is switched to normal combustion control in which the heating power of the combustor 13 is adjusted in accordance with the turning operation of the ignition key-off button 100.

Further, when the ignition control of the burner 13 is performed, the controller C increases the opening degree of the flow rate adjustment valve 6 to a predetermined opening degree θ_HThereafter, the opening degree of the flow rate adjusting valve 6 is maintained at a predetermined opening degree θ_HIs controlled on the basis of a program, whereinThe predetermined opening degree theta_HThe opening degree is an opening degree at which a predetermined amount of gas can be obtained even under the condition that the ignition of the burner 13 is difficult. Therefore, it is possible to suppress an unexpected increase in flame after ignition until the shift to the normal combustion control is made. Further, as the condition that ignition is difficult, for example, there can be exemplified: air movement such as an updraft is generated around the range 1 by operating the range hood of the whole kitchen; and turbulence of gas discharged from the flame holes of the burner 13 due to wind pressure when wind is generated.

Further, when performing ignition control of the combustor 13, the controller C performs control based on a program as follows: the opening degree of the flow rate adjustment valve 6 is adjusted from an opening degree θ corresponding to a lower limit gas amount enabling the burner 13 to burn stably_LBegins to increase. Therefore, it is possible to achieve pre-ignition and reduce the time lag from the start of the ignition operation until the ignition of the burner 13, as compared to when the flow rate adjustment valve 6 is made to gradually open from the fully closed state. The opening degree of the flow rate control valve 6 is formed to θ_H＞θ_LThe above-mentioned "lower limit gas amount capable of stably combusting the burner 13" means: the amount of gas supplied is such that the gas is not extinguished by the breeze of such a degree that the gas is not disturbed. In addition, the opening degree theta_H、θ_LCan be set appropriately according to the heating performance of the burner 13, and the opening degree theta_H、θ_LThe relationship with the gas amount may be set as appropriate based on a conventional empirical value.

In consideration of the occurrence of gas leakage or the like, it is preferable that the ignition failure is determined when the ignition control by the controller C is not switched to the normal combustion control within about 10 seconds after the ignition operation is started. When it is determined that the ignition is failed, the controller C closes the electromagnetic safety valve 5 and notifies the trouble by a notifier, not shown, provided in the oven 1. The ignition control by the controller C is generally applied to the #1 to #3 burners 13, but can be similarly applied to the #4 burner 13 as a grill burner.

Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the above embodiments. The structure and structure of the burner, the type, structure and structure of the flow rate control valve, the structure and structure of the controller, and the like may be variously modified.

Claims

1. A stove having:

a burner;

an ignition electrode attached to the burner and an igniter for applying a high voltage to the ignition electrode;

a gas supply path for supplying gas to the burner;

an electrically-operated flow rate regulating valve provided in the gas supply path and configured to increase or decrease the amount of gas supplied to the burner by increasing or decreasing the opening degree; and

a controller for controlling the igniter and the flow regulating valve,

the oven is characterized in that,

when ignition control of the burner is performed, after the igniter is energized, the controller increases the opening degree of the flow rate adjustment valve so that the amount of gas supplied to the burner is gradually increased,

in the ignition control of the burner, the controller maintains the opening degree of the flow rate adjustment valve at a predetermined opening degree at which a predetermined amount of gas that can achieve ignition is obtained even under conditions in which the burner is difficult to ignite, after increasing the opening degree of the flow rate adjustment valve to the predetermined opening degree.

2. A stove having:

a burner;

a gas supply path for supplying gas to the burner;

a controller for controlling the igniter and the flow regulating valve,

the oven is characterized in that,

when ignition control of the burner is performed, the controller increases the opening degree of the flow rate adjustment valve from an opening degree corresponding to a lower limit gas amount that enables stable combustion by the burner.