JP2011089743A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker capable of saving power by increasing a temperature rising speed and ensuring strength of a chamber wall in a heating chamber. <P>SOLUTION: This heating cooker is provided with a plurality of non-penetrating recessed sections 27 on an outdoor-side surface 25b of the chamber wall 14d of the heating chamber. A heat capacity of the chamber wall 14d of the heating chamber can be reduced by the recessed sections 27, and the temperature rising speed in the heating chamber can be increased. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention includes a heating chamber in which food is stored, microwave supply means for supplying microwaves to the heating chamber, and heating means for oven cooking for heating the food stored in the heating chamber. It relates to a cooking device.

  Conventionally, in a heating cooker, for example, a food cooked in a heating chamber can be cooked using microwaves from the microwave supply means, or cooked in ovens heated by hot air from the heating means. It is widely used in general households. In this type of cooking device, if the amount of heat released from the heating chamber is large, the heating efficiency by the heating means is reduced and more energy is consumed, so various measures are taken to improve the heat insulation of the heating chamber. Has been proposed.

  For example, the cooking device (heating cooker) of Patent Document 1 includes heat insulating members that cover the outer surfaces of the heating chamber on both the left and right sides of the heating chamber, and reduces the amount of heat released from the heating chamber by the heat insulating member. Yes. On the other hand, in the heating cooker of Patent Document 2, both the left and right chamber walls in the heating chamber have a double structure of an inner wall and an outer wall, and air is sealed between the inner wall and the outer wall, thereby Increases thermal insulation performance.

JP 2001-147021 A JP 2008-107070 A

By the way, in a heating cooker, when raising from normal temperature to predetermined temperature, for example, power consumption can be reduced and power saving can be achieved by increasing the temperature rising rate as much as possible. In this respect, according to the heat insulating structure of Patent Document 1 or Patent Document 2, the input power to the heating means can be reduced by the amount of heat leakage in the side wall of the heating chamber, but the heating time is shortened. It does not contribute directly to That is, even if a conventional heat insulating wall is used in the structure of the heating chamber, the heating time is only slightly shortened, and how to increase the heating rate is a problem.
In addition, in the cooking device capable of cooking in the range, it is necessary to ensure the strength of the chamber wall in the heating chamber and prevent leakage of microwaves, and there are specific restrictions on the structure of the heating chamber. It becomes.

  The present invention has been made in view of the above-described problems, and an object of the present invention is heating that can increase the rate of temperature rise to save power and secure the strength of the chamber wall in the heating chamber. The purpose is to provide a cooker.

  In order to achieve the above object, a heating cooker according to the present invention comprises a heating chamber in which food is stored, microwave supply means for supplying microwaves to the heating chamber, and heating the food stored in the heating chamber. Heating means for cooking the oven, and a plurality of non-penetrating recesses are provided on the outer surface of the chamber wall of the heating chamber.

  In oven cooking, as the temperature in the heating chamber is increased by the heating means, the temperature of the chamber wall of the heating chamber also increases. In this case, since the plurality of recesses are provided in the chamber wall of the heating chamber, the heat capacity of the chamber wall of the heating chamber can be reduced correspondingly, and the temperature increase rate in the heating chamber can be increased.

  And since the several recessed part was formed in the outdoor side surface non-penetrating with respect to the said chamber wall, the leakage of the microwave in a range cooking can be prevented, and it does not affect the heating performance of a microwave Can be. In addition, this makes it possible to reduce the weight of the heating chamber while securing its strength, and as a whole, it is possible to make the structure suitable for power saving by minimizing the heat capacity.

The front view of the state which shows the 1st Embodiment of this invention and opened the door of the heating cooker Vertical side view schematically showing the overall configuration It is a figure for demonstrating the chamber wall of a heating chamber, (a) is a side view from the outdoor side of a chamber wall, (b) is an expanded sectional view of a shelf board support part vicinity part. The figure which shows the temperature change in a heating chamber about the conventional product A and the product B of this invention FIGS. 2A and 2B show a second embodiment of the present invention, in which FIG. 1A is an external perspective view before assembling an inner wall member and an outer wall member that constitute a chamber wall, and FIG. 2B is a joint by caulking the inner wall member and the outer wall member to each other. The external appearance perspective view of the state which carried out, (c) is an expanded sectional view of the chamber wall which consists of an inner wall member and an outer wall member FIG. 5C equivalent view showing the third embodiment of the present invention. FIG. 3A shows a fourth embodiment of the present invention. FIG. 3 (a) equivalent view showing the fifth embodiment of the present invention. FIG. 3A shows a sixth embodiment of the present invention.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1 and FIG. 2, the main body 12 of the heating cooker 11 includes a rectangular box-shaped casing 13 that forms an outer shell, and a heating chamber 14 that is open in the front and disposed in the casing 13. I have. The casing 13 is provided with a door 13a for opening and closing the front surface of the heating chamber 14 so as to be openable and closable, and an operation unit (not shown) for setting a cooking menu and the like.

  The chamber wall that is the peripheral wall of the heating chamber 14 includes a ceiling wall 14a, a bottom wall 14b, a left side wall 14c, a right side wall 14d, and a back wall 14e. A space 15 is formed between the housing 13 as the outer box and the heating chamber 14 as the inner box as shown in FIGS. 1 and 2, and the area around the heating chamber 14 is an upper space. 15a, a lower space 15b, a left space 15c, and a right space 15d. In the following description, the left and right side walls 14c, 14d may be referred to as chamber walls 14c, 14d, but they are the same as indicated by the same reference numerals.

  A hot air casing 16 is provided on the back side of the back wall 14 e of the heating chamber 14. In the hot air casing 16, a hot air heater 17 having a rectangular frame shape (or a circular frame shape) made of an electric heater (seeds heater) is disposed. A fan 18 a of the circulation fan device 18 is disposed in the frame-shaped inner region of the hot air heater 17. The back wall 14e has a suction port 19a formed at the center corresponding to the fan 18a, and an air outlet 19b formed at the upper and lower portions so as to correspond to the hot air heater 17. The suction inlet 19a and the blower outlet 19b are each comprised from many punching holes.

  Here, when the circulation fan device 18 is driven and the fan 18a is rotated, the air in the heating chamber 14 is sucked into the fan 18a side from the suction port 19a at the center, and the air around the fan 18a is It blows out in the heating chamber 14 from the lower blower outlet 19b, and what is called circulation ventilation is performed. At this time, when the hot air heater 17 is energized and generates heat, the hot air heated by the hot air heater 17 is blown into the heating chamber 14 from the blowout port 19b. As described above, the hot air heater 17, the circulation fan device 18, and the air outlet 19 b constitute an oven cooking heating means (hot air circulation unit 20) that supplies hot air into the heating chamber 14. In addition, although illustration is abbreviate | omitted, as a heating means for oven cooking, you may make it each provide the heater which consists of a planar electric heater in the upper surface of the ceiling wall 14a of the heating chamber 14, or the lower surface of the bottom wall 14b.

  As shown in FIG. 2, a magnetron 21 is provided on the lower rear side of the outside (outside) of the heating chamber 14 so as to be positioned below the hot air casing 16. The magnetron 21 is a heating means for cooking by microwave (high frequency), and the microwave emitted from the magnetron 21 passes through the waveguide 22 and from an opening (not shown) of the bottom wall 14b. It is supplied into the heating chamber 14. These magnetron 21, waveguide 22, opening and the like constitute microwave supply means 24.

  Further, shelf support parts 23 that protrude inwardly in a plurality of steps (for example, two steps in the upper and lower directions) are extended in the horizontal direction along the wall surface on the left and right side walls 14c and 14d of the heating chamber 14. Yes. As will be described in detail later, the shelf board support portion 23 is formed by drawing the left side wall 14c and the right side wall 14d. The shelf support portion 23 supports both the left and right sides of a shelf plate (square plate) that is not shown, and the square plate is easily attached to and detached from the heating chamber 14 from the front opening. .

  Although not shown, the heating cooker 11 includes a control device mainly including a microcomputer including a CPU and a storage unit. By this control device, the magnetron 21, the circulation fan device 18, and hot air are provided. The heater 17 and the like are controlled. Further, the control device is configured to perform heating cooking such as “range cooking” and “oven cooking”, which will be described later, based on a control program stored in advance in the storage unit.

  Now, the said heating chamber 14 is comprised so that the whole heat capacity may become small in the chamber walls 14a-14e, ensuring the intensity | strength. Among the chamber walls 14a to 14e, the structure of the left side wall 14c and the right side wall 14d will be described with reference to FIG. Here, FIGS. 3A and 3B show a side view of the side wall 14d from the right space 15d side and an enlarged cross-sectional view of the vicinity of the shelf support 23. FIG.

  The chamber walls 14a to 14e of the heating chamber 14 are, for example, conductors capable of reflecting the microwave, and are made of an aluminum-plated steel plate as a metal material having a relatively high surface electrical conductivity. That is, the surface of the chamber walls 14a to 14e can be made of a material having a relatively low electrical resistance such as aluminum or zinc. In this embodiment, a steel material subjected to an aluminum plating process is used. Each of the chamber walls 14a to 14e has a plate thickness L1 set to 0.4 mm, for example, and is formed in a rectangular plate shape in which the indoor side surface 25a has a flat (planar) shape. For example, among the chamber walls 14a to 14e, the left side wall 14c and the right side wall 14d are each formed with a plurality of non-penetrating recesses 27 on the outdoor side surface 25b opposite to the indoor side surface 25a. Yes. As shown in FIG. 3, the plurality of recesses 27 in the right side wall 14d have, for example, a circular shape when viewed from the right side (viewed from the right space 15d side), and are recessed at a depth L2 of, for example, 0.3 mm on the indoor side. Is formed. The left side wall 14c and the right side wall 14d of the present embodiment have a symmetrical structure in the front view of the heating chamber 14 (see FIG. 1), and the left side wall 14c has a plurality of the same size and shape as the right side wall 14d. The concave portions 27 are formed symmetrically.

  For example, a plurality of the recesses 27 are arranged side by side so as to form a row in the front-rear direction, and a plurality of rows of the recesses 27 (see symbol X in FIG. 3A) are arranged in the vertical direction. In this case, in the row X of the recesses 27, the recesses 27 adjacent in the vertical direction are displaced from each other in the front-rear direction. This shift amount is set to a value (P / 2) that is approximately half of the pitch P in the front-rear direction, and the plurality of recesses 27 are arranged in a staggered manner with respect to the left side wall 14c and the right side wall 14d. Become. As a result, the plurality of recesses 27 are arranged at a relatively dense pitch P. For example, the area of the left side wall 14c and the right side wall 14d on the outdoor side surface 25b is approximately ½ of the area (that is, about 50 of the outdoor side surface 25b). %). Therefore, the side walls 14c and 14d are lighter than the simple plate material (chamber wall) in which the plurality of recesses 27 are not formed, so that the heat capacity is reduced.

The diameter dimension of the concave portion 27 (the maximum length dimension L3 as a diameter) is set to, for example, ¼ or less (about 30 mm or less) of the wavelength of the microwave. This is because, in both side walls 14c and 14d, the thickness of the concave portion 27 is reduced, so that even if damage or the like occurs in the thin-walled portion 28, the leakage microwave is a safety standard value (specified value of JIS standard (C9250)). : 5 mW / cm ² ), the size of the recess 27 is formed to be relatively small in diameter so as to ensure safety. Further, in the left side wall 14c and the right side wall 14d, a plurality of concave portions 27 are not provided in a portion where the shelf board support portion 23 is formed. That is, when the recess 27 is pressed (molded), a non-formed portion 26 for the shelf support 23 is provided on both side walls 14c and 14d in advance, and the shelf support 23 is drawn (formed) on the non-formed portion 26. ), The die and the thin portion 28 do not come into contact with each other, and the occurrence of cracks in the thin portion 28 during molding can be prevented.

  Then, the effect | action of the heating cooker 11 is demonstrated. In the present embodiment, “range cooking” that performs microwave cooking by the microwave supply means 24 on the food in the heating chamber 14 and “oven cooking that performs heating cooking by the hot air circulation unit 20”. ”As an example.

  Before starting the “range cooking”, the user accommodates food (for example, rice or milk) as an object to be heated in the heating chamber 14. When range cooking is selected by the operation unit, the magnetron 21 is driven based on the selection operation, and the microwave emitted from the magnetron 21 passes through the waveguide 22 and is heated from the opening of the bottom wall 14b to the heating chamber. 14 is supplied. In this case, the chamber walls 14a to 14e of the heating chamber 14 have a flat indoor surface 25a except for the shelf support 23, which causes a reduction in heating efficiency and sparks due to microwaves (that is, concentration of microwaves). Since there are no edges or protrusions, the food can be efficiently heated. Moreover, since the chamber walls 14a to 14e are made of an aluminum-plated steel plate, they have the strength, wear resistance, and heat resistance of the steel (stainless steel), and also have the electrical conductivity of aluminum on the surface thereof. A structure suitable for heating food by waves. That is, when microwaves are irradiated into the heating chamber 14, heat is generated due to so-called radio wave loss (reflection loss) in which current flows on the indoor side surfaces 25a of the chamber walls 14a to 14e, which are metal materials. Since the surface 25a is plated with aluminum, the reflection loss is reduced and the heating efficiency for the food is increased.

  Before starting “oven cooking”, the user places, for example, the square dish on the upper (or lower) shelf support 23 in the heating chamber 14. Moreover, food (for example, meat and bread) is previously placed on a square plate. When oven cooking is selected in the operation unit, energization of the hot air heater 17 is started based on the selection operation, and the circulation fan device 18 is driven. In this case, as indicated by arrows in FIG. 2, the hot air blown into the heating chamber 14 from the upper and lower outlets 19b flows forward, hits the door 13a, and the hot air hits the door 13a. The central portion in the vertical direction flows in the opposite direction and is sucked into the suction port 19a. The hot air circulating at this time raises the room temperature of the heating chamber 14 and flows along the square plate to heat the food. In the oven cooking, as the room temperature rises, the temperature of the chamber walls 14a to 14e also rises. However, among the chamber walls 14a to 14e, the heat capacity of both side walls 14c and 14d is particularly small, so the rate of temperature increase is fast. In other words, it is possible to save power in heating food. In other words, the time from the start of energization to the hot air heater 17 until the temperature in the heating chamber 14 reaches a predetermined cooking temperature (or preheating temperature) is shortened.

  In order to verify this effect, the inventor has a heating cooker having a conventional configuration (the concave wall 27 is not formed on the wall of the heating chamber and is referred to as a conventional product A), both side walls 14c of the heating chamber 14, An experiment was performed comparing the cooking device 11 (product B of the present invention) having a plurality of recesses 27 in 14d. In this experiment, the target temperature in the heating chamber was set constant in advance, and hot air was circulated by each of the hot air circulation units, and the temperature of the heating chamber was measured. Here, FIG. 4 shows the temperature change in the heating chamber of the conventional product A and the product B of the present invention. As is clear from the figure, the product B of the present invention is heated more than the conventional product A. It can be seen that the temperature rise rate in the room is fast, and the temperature rise time from room temperature to the target temperature can be shortened. Such a difference is considered to occur for the following reason.

  That is, in the product B of the present invention, the side walls 14c and 14d having a thickness of 0.4 mm are provided so that the plurality of recesses 27 having a depth of 0.3 mm occupy approximately 50% of the outdoor surface 25b. It has been. For this reason, the weights of the side walls 14c and 14d correspond to the weight of a normal plate member having a plate thickness of 0.25 mm without the recess 27 (note that the plate thickness is 0.4 mm × 0.5 + (0 4 mm−0.3 mm) × 0.5 = 0.25 mm)). Here, it is difficult to ensure the structural strength of a normal plate material having a thickness of 0.25 mm as the chamber wall of the heating chamber. However, in the present invention, the concave portions 27 are formed to form the side walls 14c and 14d. While ensuring the strength, it was possible to reduce the heat capacity by reducing the weight by the plurality of recesses 27.

  As described above, the heating cooker 11 of the present embodiment is for the microwave cooking means 24 for supplying the microwave into the heating chamber 14 and the oven cooking for heating the food stored in the heating chamber 14. And a plurality of non-penetrating recesses 27 are provided on the outer surface 25b of the chamber walls 14c and 14d of the heating chamber 14. According to this, in oven cooking, the temperature of the chamber walls 14a to 14e of the heating chamber 14 increases as the temperature in the heating chamber is increased by the hot air circulation unit 20, but as described above, the plurality of recesses 27 Therefore, the heat capacity of the chamber walls 14c and 14d of the heating chamber 14 can be reduced correspondingly, and the temperature increase rate in the heating chamber 14 can be increased. In addition, since the plurality of concave portions 27 are formed in the outdoor surface 25b in a non-penetrating manner with respect to the chamber walls 14c and 14d, it is possible to prevent leakage of microwaves in the range cooking and to influence microwave heating performance. Can not come. In addition, this makes it possible to reduce the weight of the chamber walls 14a to 14e of the heating chamber 14 while ensuring a predetermined strength (plate thickness), and as a whole, a structure suitable for power saving by reducing the heat capacity as much as possible. It can be.

  The indoor side surfaces 25a of the chamber walls 14a to 14e of the heating chamber 14 are flat, and a plurality of recesses 27 are provided only on the outdoor surface 25b of the chamber walls 14a to 14e. According to this, since the indoor side surface 25a of the heating chamber 14 is flat, the chamber walls 14a to 14e can be easily cleaned, and the heating efficiency is reduced by the microwave and sparks are generated (that is, Since there are no edges or protrusions that cause microwaves to concentrate, food can be efficiently heated. Accordingly, it is possible to ensure the heating performance by the microwave equivalent to that of the chamber wall without the recess 27, while the configuration in which the plurality of recesses 27 are provided in the chamber walls 14 c and 14 d of the heating chamber 14.

  The indoor side surface 25a in the chamber walls 14a to 14e of the heating chamber 14 has an electric conductivity equal to or higher than the electric conductivity of the remaining portion. According to this, the reflection loss in the indoor side surface 25a of the chamber walls 14a to 14e when the microwave is irradiated into the heating chamber 14 can be reduced, and the heating efficiency of the food by the microwave can be improved. it can. Moreover, according to this, it can be set as a comparatively cheap structure by the aluminum plating process with respect to steel materials like a present Example, for example. In addition, by using the steel material (stainless steel), the heat resistance of the surface portions of the chamber walls 14a to 14e and the wear resistance of the sliding portion of the square plate in the shelf support portion 23 can be complemented. It can be set as the structure which has heat resistance required for cooking, and the heating performance (electrical conductivity of aluminum) in range cooking.

  The chamber walls 14a to 14e of the heating chamber 14 are integrally provided with a shelf board support portion 23 that supports a shelf board on which food is placed, and the shelf board support portions 23 in the chamber walls 14a to 14e are provided with a plurality of recesses 27. Was not provided. According to this, at the time of press molding of the shelf board support portion 23, the die and the thin wall portion 28 of the chamber walls 14 a to 14 e do not come into contact with each other, and the occurrence of cracks or the like in the thin wall portion 28 during molding is prevented. be able to.

  The diameter L3 or the maximum length of each recess 27 in the chamber walls 14c and 14d of the heating chamber 14 was set to a dimension equal to or less than ¼ of the wavelength of the microwave. According to this, even if breakage or the like occurs in the concave portion 27 (thin wall portion 28) due to, for example, exceeding the product life, since the concave portion 27 has a relatively small size and shape, the leakage microwave has the above specified value. It is possible to ensure that safety is not exceeded.

  The plurality of recesses 27 are arranged in a staggered pattern on the chamber walls 14c and 14d. According to this, when the concave portion 27 is made circular as in the present embodiment, for example, the plurality of concave portions 27 can be arranged with a pitch as dense as possible with respect to the chamber walls 14c and 14d. It becomes possible to reduce the heat capacities of 14c and 14d as much as possible.

<Other embodiments>
5 to 9 show the second to sixth embodiments. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted, and different points will be described.

  FIG. 5 shows a second embodiment of the present invention. The left and right side walls 31c and 31d of the present embodiment are different from the side walls 14c and 14d of the first embodiment in the following points. That is, as shown in FIG. 5A, the right side wall 31d (and the left side wall 31c) includes an inner wall member 32 having a flat plate shape and an outer wall member 34 having a plurality of through holes 33. . The inner wall member 32 and the outer wall member 34 are made of, for example, different metal materials. The inner wall member 32 is formed of an aluminum plate having a thickness of 0.1 mm, and the outer wall member 34 is formed of a stainless steel plate having a thickness of 0.3 mm. ing. The inner wall member 32 can be made of a material having a relatively low electrical resistance, such as zinc, in addition to aluminum, and the outer wall member 34 can be made of stainless steel, as well as the heat resistance and wear resistance of the inner wall member 32. What has the material characteristic which complements property can be used.

  The plurality of hole portions 33 are formed with the same diameter L3 as the plurality of recesses 27 with respect to the outer wall member 34 and are arranged at the same pitch P as the plurality of recesses 27. Here, FIGS. 5A and 5B are schematic views in which the shelf board support portion 23 (or the non-formation portion 26) is omitted for convenience of explanation. The rows X of the holes 33 have the same arrangement structure as the rows X of the recesses 27, and the plurality of holes 33 are also arranged in a staggered pattern on the outer wall member 34. And in both side walls 31c and 31d, the inner wall member 32 is arrange | positioned so that the some hole part 33 may be obstruct | occluded from the room inner side with respect to the outer wall member 34, and the some hole part 33 comprises a some recessed part.

  FIG. 5B shows an external perspective view of the state in which the inner wall member 32 and the outer wall member 34 of the right side wall 31d are joined together by caulking. That is, the inner wall member 32 and the outer wall member 34 are formed with a plurality of insertion holes (not shown) penetrating the both members 32 and 34, for example, and a fixing member 35 as a rivet inserted into each of the insertion holes. It is arranged. The fixing member 35 is inserted into the insertion holes of the inner wall member 32 and the outer wall member 34, and has a locking end portion that is caulked and widened at the end portions thereof. As shown in FIG. 5B, the locking end portion of the fixing member 35 is formed in a rectangular flat shape (or a round shape or the like), and has excellent appearance design. The right wall 31d is configured by joining the inner wall member 32 and the outer wall member 34 to each other by the fixing member 35. In this case, the outer wall member 34 is positioned on the outdoor side of the right side wall 31d, and the inner wall member 32 is positioned on the indoor side. Further, the indoor side of the plurality of holes 33 is closed by the inner wall member 32 on the outdoor surface 25b of the right side wall 31d (see FIG. 5C), and the plurality of holes 33 constitute a plurality of recesses. is doing. The left side wall 31c and the right side wall 31d of the present embodiment have a symmetrical structure in the front view of the heating chamber 14, and the left side wall 31c has a plurality of concave portions having the same size and shape as the right side wall 31d symmetrically. Will be placed.

  In the above configuration, the chamber walls 31c and 31d of the heating chamber 14 include a flat inner wall member 32 and an outer wall member 34 having a plurality of through holes 33, and the inner walls 31 and 31d have inner walls. The member 32 is arrange | positioned so that the several hole 33 may be obstruct | occluded from the room inner side with respect to the outer wall member 34, and the several hole 33 comprises the said several recessed part. Therefore, unlike the first embodiment in which a plurality of recesses 27 are press-formed with respect to one plate material 14c, 14d, according to this embodiment, the outer wall in which the flat inner wall member 32 and the hole 33 are formed. It is sufficient to join the member 34. For this reason, the finished dimensional accuracy of the product (the chamber walls 31, 31d) can be increased, and a stable heat capacity reduction effect (and thus an energy saving effect) can be obtained.

  The inner wall member 32 and the outer wall member 34 are made of different metal materials. According to this, aluminum having a relatively high electrical conductivity can be used as the inner wall member 32, and a material that complements material properties such as strength of the inner wall member 32 can be appropriately selected as the outer wall member. Therefore, it is possible to selectively use a plurality of suitable materials for the chamber wall of the heating chamber 14, and to have a structure having both the above-described performances in oven cooking and range cooking. can do.

  The inner wall member 32 is made of a material having higher electrical conductivity than the material constituting the outer wall member 34. According to this, the reflection loss in the indoor side surface 25a of the chamber walls 31 and 31d when the microwave is irradiated into the heating chamber 14 can be reduced, and the heating efficiency of the food by the microwave can be improved. it can.

  Unlike the present embodiment, when the inner wall member 32 and the outer wall member 34 are joined by spot welding, both the members 32 and 34 are relatively thin and have different electrical characteristics. There is a risk of holes. In this respect, in the present embodiment, since the inner wall member 32 and the outer wall member 34 are joined by caulking, manufacturing management can be facilitated, and both the members 32 and 34 can be securely fixed to each other. Moreover, according to the fixing member 35, since it can be set as the design suitable shape mentioned above in the latching end part, an external appearance design property can be improved.

  FIG. 6 is a view corresponding to FIG. 5C, showing a third embodiment of the present invention. As shown in the figure, a heat insulating member 37 is disposed on the right side wall 31d to cover the outdoor side surface 25b. The heat insulating member 37 is made of, for example, glass wool, and is disposed as if the plurality of concave portions (the plurality of hole portions 33) are covered from the outdoor side, and is provided so as to be in close contact with the outer wall member 34 of the right side wall 31d. It has been. Although illustration is omitted, a heat insulating member 37 is disposed on the left side wall 31c similarly to the right side wall 31d, and the heat insulating member 37 is in close contact with the outer wall member 34 of the left side wall 31c from the outdoor side. It is provided as follows.

  According to the above configuration, since the heat insulating member 37 is provided outside the chamber walls 31c and 31d of the heating chamber 14, the heat insulating performance of the heating chamber 14 can be enhanced. Therefore, the amount of heat released from the heating chamber 14 can be reduced, and power saving can be achieved. Further, since the heat insulating member 37 is in close contact with the outside of the chamber walls 31c and 31d so as to form a closed space in the plurality of recesses, the closed space functions as an air heat insulating layer. Therefore, in the case of oven cooking, an energy saving effect can be further enhanced in combination with the effect of reducing the heat capacity.

  FIG. 7 is a view corresponding to FIG. 3A showing the fourth embodiment of the present invention. As shown in FIG. 7, the plurality of recesses 40 in the right side wall 14d (or the left side wall 14c) are square. It differs from the recessed part 27 of 1st Embodiment by the point which makes a shape. The plurality of recesses 40 have a pitch P1 in the front-rear direction shorter than the pitch P in the front-rear direction of the plurality of recesses 27, and the interval between the rows X1 of the recesses 40 is wider than the interval between the rows X of the recesses 27. It is a staggered arrangement.

FIG. 8 is a view corresponding to FIG. 3 (a), showing a fifth embodiment of the present invention. As shown in FIG. 8, the plurality of recesses 41 are formed in a rectangular shape that is long in the front-rear direction. It differs from the recess 40 in that the pitch P2 in the direction is set longer than the pitch P1 of the plurality of recesses 40.
FIG. 9 is a view corresponding to FIG. 3 (a), showing a sixth embodiment of the present invention. As shown in FIG. 9, a plurality of recesses 42 are provided in the recesses 42 adjacent in the vertical direction in the front-rear direction. There is no deviation and it is different from the concave portion 40 in that it is arranged in a lattice pattern on the outdoor surface 25b.

  As described above, the shape, pitch, arrangement, and the like of the plurality of recesses can be changed as appropriate, and any of the recesses 40 to 42 has the maximum length L3 as in the case of the recesses 27 and the holes 33. The dimension is set to 1/4 or less. Therefore, in the chamber wall of the present invention, safety can be ensured as described above even if the thin wall portion corresponding to the concave portions 27 and 40 to 42 (or the hole portion 33) is damaged. Moreover, these recessed parts 40-42 can be applied as a structure of the both-side walls 31c and 31d in 2nd Embodiment, ie, the hole part of the outer wall member 34, and all can obtain a desired heat capacity reduction effect.

  In addition, this invention is not limited to each above-mentioned embodiment, It can apply to general cooking-by-heating machines, such as what the ceiling wall of a heating chamber forms arch shape. In addition, although the plurality of recesses are formed in the side walls 14c, 14d, 31c, 31d, the present invention is not limited to this, and the plurality of recesses are formed in the ceiling wall 14a, the bottom wall 14b, and the back of the heating chamber 14. It can also be formed on the wall 14e to reduce the heat capacity. In the heating chamber 14 of the first embodiment, a heat insulating member 37 may be provided on the outdoor surface 25b of each of the side walls 14c and 14d. The inner wall member 32 of the second embodiment may be made of a conductor capable of reflecting microwaves, and the outer wall member 34 may be made of a material other than the conductor. In addition, the present invention can be modified as appropriate, such as heating food using the above-mentioned planar heaters provided on the upper surface of the ceiling wall 14a and the lower surface of the bottom wall 14b as other heating means during oven cooking. It can be implemented.

  In the drawing, 14 is a heating chamber, 14a to 14e are chamber walls, 20 is a hot air circulation unit (heating means for oven cooking), 23 is a shelf support section, 24 is a microwave supply means, 25a is an indoor surface, 25b Is an outdoor surface, 27, 40, 41 and 42 are recesses, 32 is an inner wall member, 33 is a hole, 34 is an outer wall member, and 37 is a heat insulating member.

Claims (11)

A heating chamber in which food is stored;
Microwave supply means for supplying microwaves to the heating chamber;
Heating means for cooking the oven for heating the food stored in the heating chamber,
A heating cooker, wherein a plurality of non-penetrating recesses are provided on an outer surface of a chamber wall of the heating chamber.   2. The cooking device according to claim 1, wherein an indoor-side surface of the chamber wall of the heating chamber has a flat shape, and the plurality of concave portions are provided only on an outdoor surface of the chamber wall.   3. The cooking device according to claim 1, wherein an indoor surface of the chamber wall of the heating chamber has an electrical conductivity equal to or higher than an electrical conductivity of the remaining portion. 4. The chamber wall of the heating chamber includes a flat inner wall member and an outer wall member having a plurality of through holes,
In the chamber wall, the inner wall member is disposed so as to block the plurality of holes from the indoor side with respect to the outer wall member, and the plurality of holes configure the plurality of recesses. The cooking device according to any one of claims 1 to 3.   The cooking device according to claim 4, wherein the inner wall member and the outer wall member are made of different metal materials.   The cooking device according to claim 4 or 5, wherein the material constituting the inner wall member has a higher electrical conductivity than the material constituting the outer wall member.   The cooking device according to any one of claims 4 to 6, wherein the inner wall member and the outer wall member are joined by caulking.   The heating cooker according to any one of claims 1 to 7, wherein a heat insulating member is provided outside the chamber wall of the heating chamber. In the chamber wall of the heating chamber, integrally having a shelf support portion for supporting a shelf on which food is placed,
The cooking device according to any one of claims 1 to 8, wherein the plurality of concave portions are not provided in the shelf board support portion of the chamber wall.   The cooking according to any one of claims 1 to 9, wherein the diameter or maximum length of each recess in the chamber wall of the heating chamber is set to a dimension equal to or less than ¼ of the wavelength of the microwave. vessel.   The cooking device according to any one of claims 1 to 10, wherein the plurality of recesses are arranged in a staggered pattern or a lattice pattern on the chamber wall.

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