Cooking device

Abstract

A cooking device (HC) is provided with: a burner (3) in which a plurality of flame holes (32) are opened in a tubular burner body (31) at intervals in the longitudinal direction of the burner body; an infrared radiation member (4) that is disposed so as to face the burner main body at a distance from the burner main body in the direction in which the gas is ejected from the flame hole, is long in the longitudinal direction of the burner main body, and radiates infrared rays by being heated; and a thermocouple (6) for detecting flames generated when fuel gas is supplied to the burner and the fuel gas ejected from the flame hole is burnt, in which the hydrogen flames can be reliably monitored without impairing the endurance even when the burner uses the fuel gas as hydrogen and the hydrogen ejected from the flame hole is diffused and burnt. The thermocouple is disposed such that a temperature measurement contact part (61) thereof is positioned on a surface on which a line (S1) connecting the peripheral edge of the flame hole and one end of the infrared radiation member in the width direction is projected in the longitudinal direction of the burner body at the shortest distance.

Description

Technical Field

[0001] The present invention relates to a heating cooking device for heating and cooking food by burning gas. Background Art

[0002] As such a heating cooking device, the following structure is known, which comprises: a burner having a plurality of flame holes spaced apart in a tubular burner body along the length direction of the burner body; and an infrared radiation component which is arranged opposite to the burner body at intervals in the direction in which the gas is ejected from each flame hole, is long in the length direction of the burner body, and radiates infrared rays by being heated (for example, refer to Patent Document 1). With regard to this structure, the fuel gas is set as natural gas or LP gas, and a mixed gas with an excess air ratio of about 1.0 to 1.2 is supplied to the burner to burn the gas ejected from the flame hole. At this time, an auxiliary flame hole is opened on the outer side of the flame hole located at one end in the length direction of the burner body, and a thermocouple is arranged in such a way that the temperature measuring contact portion protrudes into the flame generated by the combustion of the gas from the auxiliary flame hole, thereby detecting the flame.

[0003] However, in recent years, in order to prevent global warming, hydrogen that does not emit carbon dioxide has attracted attention as an alternative fuel to hydrocarbon gas. In addition, in order to efficiently heat infrared radiation components using the hydrogen flame generated when hydrogen is burned, it is considered to configure the burner so that the hydrogen ejected from the flame hole is diffusely burned. In this case, as in the above-mentioned conventional example, if the thermocouple is configured in a manner such that the temperature measuring contact portion protrudes into the hydrogen flame generated by hydrogen combustion, there is the following problem: the temperature of the temperature measuring contact portion becomes too high, resulting in a decrease in endurance. On the other hand, the hydrogen flame during diffusion combustion is easily affected by the secondary air and shakes, so if the temperature measuring contact portion is too far away from the hydrogen flame, it is sometimes impossible to monitor the hydrogen flame.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 6-229519 Summary of the invention

[0007] In view of the above problems, an object of the present invention is to provide a cooking device capable of reliably monitoring a hydrogen flame without deteriorating the durability even when a burner is configured to diffuse and burn hydrogen ejected from a flame hole.

[0008] In order to solve the above-mentioned problems, the heating and cooking device of the present invention heats and cooks food by burning gas, and comprises: a burner having a plurality of flame holes spaced apart in a tubular burner body along the length direction of the burner body; an infrared radiation component which is spaced apart and opposed to the burner body in the direction in which gas is ejected from the flame holes, is longer in the length direction of the burner body, and is heated to radiate infrared rays; and a thermocouple for detecting the flame generated when gas is supplied to the burner and the gas ejected from the flame hole is burned, and is characterized in that the burner sets the gas to hydrogen and causes the hydrogen ejected from the flame hole to diffusely burn, and the thermocouple is arranged so that its temperature measuring contact portion is located on a surface obtained by projecting a line connecting the periphery of the flame hole and one end in the width direction of the infrared radiation component at the shortest distance in the length direction of the burner body.

[0009] According to the present invention, the problem of the temperature of the temperature measuring contact portion becoming too high and causing the endurance to decrease does not occur, and the hydrogen flame can be always monitored even if the hydrogen flame fluctuates. In addition, the "temperature measuring contact portion is located on the plane obtained by projecting the line connecting the periphery of the flame hole and one end of the width direction of the infrared radiation component at the shortest distance in the longitudinal direction of the burner body" mentioned in the present invention includes not only the case where the temperature measuring contact portion is located at a position substantially tangent to the projected surface, but also the case where the temperature measuring contact portion is located at a position intersecting with the projected surface.

[0010] However, the flame hole closest to the end of the burner body in the longitudinal direction is particularly susceptible to the influence of secondary air and shakes. Therefore, in the present invention, preferably, when viewed from the infrared radiation component side, the temperature measuring contact portion is located at a position where the distance from the end of the burner body in the longitudinal direction reaches or exceeds the distance to the adjacent flame hole of the flame hole closest to the end. As a result, the temperature measuring contact portion is located at a position where the hydrogen flame is more stable, and the hydrogen flame can be monitored more reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view of the heating cooking device according to this embodiment.

[0012] Figure 2 It is along Figure 1 A partially omitted cross-sectional view of line II-II.

[0013] Figure 3 It is along Figure 1 Cross-sectional view along line III-III.

[0014] Figure 4 yes Figure 3 A partial enlarged view of . DETAILED DESCRIPTION

[0015] Hereinafter, an embodiment of the heating cooking device of the present invention will be described with reference to the accompanying drawings, wherein the fuel gas is hydrogen, and the hydrogen is burned to heat and cook the food such as meat and fish. In addition, the "hydrogen" mentioned in the present invention is not limited to pure hydrogen, and includes, for example, the case where a small amount of rancid agent for emitting odor is added.

[0016] Reference Figure 1 to Figure 3 The heating cooking device HC has a device body 1 that is long in a horizontal direction and in the shape of a rectangular parallelepiped. The device body 1 includes: a support frame 11 having a pair of inner plates 11a and 11b spaced apart in the length direction, and inner beam plates 11c respectively arranged between the inner plates 11a and 11b on both sides of the width direction of the two inner plates 11a and 11b; and a top plate 12 that covers the upper surface opening of the support frame 11, and a storage space 11d that passes through in the width direction is formed below the inner beam plate 11c. The juice receiving tray 2 is freely detachably stored in the storage space 11d, and a heat insulating member 11e is installed on the inner surface of the inner beam plate 11c. A box-shaped cover body 13 is installed on the outer surface of the inner plate 11a on one side in the length direction, and the surroundings of the support frame 11, the top plate 12 and the cover body 13 are covered by a decorative plate Vp.

[0017] Although not specifically illustrated, various components such as a control substrate that receives power from a battery and controls the operation of the heating cooking device HC, a gas pipe for supplying hydrogen to a gas nozzle inserted at one end of a burner to be described later, a gas cock and an electromagnetic opening and closing valve that are provided on the gas pipe and adjust the flow rate of hydrogen supplied to the gas nozzle are arranged in the cover 13. An operating knob 14 is provided on the front surface of the decorative plate Vp covering the cover 13, and the gas cock is operated in conjunction with the rotation operation of the operating knob 14 to adjust the flow rate of hydrogen supplied to the gas nozzle. In addition, the above-mentioned components required for the combustion of the burner can use a known structure, so the detailed description including the ignition and flameout operation of the burner is omitted here.

[0018] The top plate 12 held at both ends in the longitudinal direction is provided with a first rectangular opening 12a located above the juice receiving tray 2 and longer in the longitudinal direction, and a second opening Vp1 which is one circle larger than the first opening 12a is provided on the upper surface of the decorative plate Vp. A support frame 15 is erected on the top plate 12 so as to be located on both sides in the width direction of the second opening Vp1, and the support frame 15 supports a grilling net 16 on which a cooked object (not shown) is placed. The support frame 15 is provided with three upper and lower support parts 15a for supporting each crossbar part 16a of the grilling net 16. Thus, the height of the grilling net 16 can be switched to three levels. In addition, two first guide plates 12b extending obliquely downward are provided at two inner edges of the first opening 12a along the length direction, and the first guide plates 12b and the second and third guide plates 17a, 17b respectively provided outside the first guide plates 12b can guide the barbecue juice and oil generated when the food is heated and cooked to the juice receiving tray 2. Furthermore, the two burners 3, 3 are arranged side by side in the width direction with a gap between the first guide plates 12b, 12b on both sides.

[0019] Each burner 3 is configured as follows: Figure 2 The metal tubular burner body 31 is sealed (left end in the middle), and a plurality of flame holes 32 are provided at intervals along the length direction within the range facing the first opening 12a. In the present embodiment, the burner body 31 has a circular tubular profile, and each flame hole 32 is provided at the top. In this case, the aperture of each flame hole 32 is set to be less than 0.6 mm. In addition, from one side in the length direction ( Figure 2 The closed end of each burner 3 protruding from the inner plate 11b of the cover body 13 (left side in the middle) is supported by the inner surface of the decorative plate Vp, and the gas nozzle 33 provided in the cover body 13 is embedded in the cover body 13 from the other side in the length direction ( Figure 2 The open end of each burner 3 protrudes from the inner plate 11a (right side in the center).

[0020] In addition, an infrared radiation component 4 is arranged at a distance above the direction in which hydrogen is ejected from the flame hole 32 relative to the burner body 31. The infrared radiation component 4 is composed of a metal plate bent into a downward arc shape, and its size is specified to be a length that can cover all the flame holes 32 of the burner body 31. In this case, a pair of support plate portions 12c, 12c are installed on the two inner edge portions along the width direction of the first opening 12a, and the two ends of the infrared radiation component 4 are supported by the two support plate portions 12c, 12c, respectively. The inner diameter of the infrared radiation component 4 is set to be larger than the outer diameter of the burner body 31 to prevent barbecue juice and oil from dripping onto the surface of the burner body 31. At the other end in the length direction closest to the burner body 31 ( Figure 2A pair of rod-shaped electrodes 5a and 5b are provided near the flame holes 32 (hereinafter, the flame holes at both ends in the longitudinal direction are referred to as "flame holes 32a") at the right end in the middle. Then, by operating the operation knob 14, a high voltage is applied between the pair of rod-shaped electrodes 5a and 5b from the control substrate not shown in the figure, and ignition is performed by the spark discharge generated thereby. When ignition is performed, the hydrogen supplied to the burner 3 is ejected from each flame hole 32 and diffusely combusted, thereby generating a hydrogen flame Hf (see Figure 4 ). Then, the infrared radiation member 4 is heated by the hydrogen flame Hf to become red hot, and the infrared radiation radiated at this time is used to heat and cook the food placed on the grill 16 (cooking).

[0021] Here, regarding the hydrogen flame Hf during complete combustion generated by the combustion of hydrogen, there is no active species accompanied by chemiluminescence in the visible light region, so it is almost impossible to visually confirm. In this case, if the infrared radiation component 4 becomes red hot, it can be determined that the hydrogen flame Hf is normally formed, but it takes time until the infrared radiation component 4 becomes red hot. In this embodiment, Figure 4 As shown, the flame reaction agent Fc is applied to the surface of the flame hole opening portion of the burner body 31 and the surface of the two ends in the width direction of the infrared radiation component 4. Specifically, each flame hole 32 is set as the starting point, the surface of the burner body 31 that is larger than the range that the hydrogen flame Hf can contact is set as the flame hole opening portion Pv1, and the inner and outer surfaces of the specified range of the two ends in the width direction of the infrared radiation component 4 are set as the surface Pv2 of the two ends in the width direction of the infrared radiation component 4, thereby applying the flame reaction agent Fc. In this case, a known paint Pm with heat resistance is prepared, and a granular flame reaction agent Fc is added to the paint Pm at a specified weight ratio, and the paint Pm to which the flame reaction agent Fc is added is applied to the surface. As the flame reaction agent Fc, there is no problem in terms of hygiene for the cooked food. In addition, as long as chemiluminescence in the visible light region can be observed, there is no particular limitation. For example, compounds such as sodium chloride (yellow), sodium carbonate (yellow), and potassium chloride (purple) can be used.

[0022] As described above, the hydrogen flame generated by the combustion of hydrogen reacts with the flame reaction agent to cause a flame reaction (i.e., a colored flame), so that the presence of the hydrogen flame can be quickly judged by visual inspection from the beginning of the combustion without waiting for the red heat of the infrared radiation component 4. On this basis, the flame reaction agent is not mixed with the hydrogen ejected from the flame hole 32 in order to make the hydrogen flame visible, so that the unfavorable situation of reducing the calorific value has not yet occurred. In addition, it is easy to supply secondary air to the flame hole 32 along the surface of the flame hole opening part Pv1, and the secondary air is required to make the hydrogen flame Hf spread more significantly along the surface of the flame hole opening part Pv1, so the range of causing the flame reaction becomes larger and the presence of the hydrogen flame can be more reliably judged. In addition, even if the flame reaction agent Fc is only applied to the inner side surface of the infrared radiation component 4 in the width direction, the colored flame generated by the flame reaction also overflows to the outer side of the infrared radiation component 4 in the width direction, so the presence of the hydrogen flame Hf can be judged.

[0023] However, even when the burner 3 and the infrared radiation component 4 are configured in the above manner and the presence or absence of the hydrogen flame can be quickly determined from the beginning of combustion, when a fire occurs for some reason, it is necessary to stop the supply of hydrogen to the burner 3 as quickly as possible. In the present embodiment, known thermocouples 6 are provided on the support plate portions 12c, 12c in a manner so as to be located at both ends of the length direction of each burner 3. Furthermore, if the output from the thermocouple 6 is input to the control substrate (not shown) and reaches below a predetermined threshold value, the electromagnetic on-off valve is closed to stop the supply of hydrogen to the burner 3. Here, if the thermocouple 6 is configured in a manner such that the temperature measuring contact portion 61 at the end of the thermocouple 6 protrudes into the hydrogen flame Hf, the temperature of the temperature measuring contact portion 61 becomes too high and the endurance is reduced. On the other hand, when each burner 3 is diffusely burned, its hydrogen flame Hf is easily affected by the secondary air and shakes. Therefore, if the temperature measuring contact portion 61 is too far away from the hydrogen flame, it is sometimes impossible to monitor the hydrogen flame Hf. In the present embodiment, if Figure 2 and Figure 4 As shown, the temperature measuring contact portion 61 of the thermocouple 6 is located on the plane obtained by projecting the line S1 connecting the periphery of the flame hole 32 and one end of the infrared radiation component 4 in the width direction at the shortest distance in the length direction of the burner body 31, and is located at a position where the distance L1 from the end of the length direction of the burner body 31 reaches or exceeds the distance L2 to the adjacent flame hole 32 (referred to as "flame hole 32b") of the flame hole 32a closest to the end. In addition, when the temperature measuring contact portion 61 is located on the plane obtained by projecting in the length direction of the burner body 31, as shown in FIG. Figure 4 As shown, it includes not only the case where the temperature measuring contact portion 61 is located at a position substantially tangent to the projected surface, but also the case where the temperature measuring contact portion 61 is located at a position intersecting with the projected surface.

[0024] As described above, the problem of the temperature of the temperature measuring contact part 61 becoming too high and causing the endurance to decrease does not occur, and the hydrogen flame can be always monitored even if the hydrogen flame fluctuates. In addition, the flame hole 32a at the end portion on one side of the length direction closest to the burner body 31 is particularly susceptible to the influence of secondary air and fluctuates, but the temperature measuring contact part 61 is located at a position where the distance L1 from the end portion in the length direction of the burner body 31 reaches a distance L2 or more from the flame hole 32b, so the hydrogen flame Hf can be monitored more reliably.

[0025] The above is a description of the embodiment of the present invention, but various modifications are possible as long as they do not depart from the scope of the technical concept of the present invention. In the above embodiment, the burner 3 is set to two as an example, but the number is not particularly limited. In addition, the case where the burner body 31 has a circular tubular profile is described as an example, but if the cross-sectional shape of the surface of the flame hole opening portion Pv1 of the burner body 31 is an arc shape protruding in the direction of hydrogen ejection from the flame hole 32, the cross-sectional shape of the surface other than the flame hole opening portion can be other than the arc shape, such as a square.

[0026] In the above embodiment, the infrared radiation component 4 has an arc-shaped contour that is curved downward, but this is not limited to this if infrared radiation can be radiated to the cooked food in a larger range. For example, a flat plate-shaped structure may also be used.

[0027] Description of Reference Numerals

[0028] HC…heating cooking device; 3…burner; 31…burner body; 32, 32a, 32b…flame holes; 4…infrared radiation component; 6…thermocouple; 61…temperature measuring contact portion; Fc…flame color reaction agent; Sl…a line connecting the periphery of the flame hole and one end in the width direction of the infrared radiation component at the shortest distance.

Claims

1. A heating cooking device that burns gas to heat and cook food. The heating cooking device comprises: a burner having a plurality of flame holes spaced apart in a tubular burner body along the length direction of the burner body; an infrared radiation component which is disposed opposite to the burner body at intervals in the direction in which gas is ejected from the flame holes, is long in the length direction of the burner body, and radiates infrared rays by being heated; and a thermocouple for detecting a flame generated when gas is supplied to the burner and the gas ejected from the flame holes is burned. It is characterized in that The burner uses hydrogen as fuel and diffuses and burns the hydrogen ejected from the flame holes. The thermocouple is arranged so that its temperature measuring contact portion is located on a plane obtained by projecting a line connecting the periphery of the flame hole and one end of the infrared radiation component in the width direction at the shortest distance in the longitudinal direction of the burner body.

2. The heating cooking device according to claim 1, characterized in that: When viewed from the infrared radiation component side, the temperature measuring contact portion is located at a position where the distance from the end portion in the longitudinal direction of the burner body reaches or exceeds the distance to the adjacent flame hole of the flame hole closest to the end portion.

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