Cooker

Abstract

To improve cleanliness of a heating chamber while ensuring high firepower.SOLUTION: A cooker 10 comprises: a heating chamber 28 that stores food products inside a body 11; a plurality of tube heaters 31 that passes through the heating chamber 28 and irradiates the heating chamber 28; two or more protective glasses 33 that protect the respective tube heaters 31; and a reflective plate 34 that reflects radiant heat T31 from the tube heaters 31. In the cooker 10, the reflective plate 34, the tube heaters 31 and the protective glasses 33 are provided in order from the outside of the heating chamber 28.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a cooking device. [Background technology]

[0002] Examples of documents that describe the configuration of the vicinity of the heater of a cooking device include those described in Patent Documents 1 to 5. Patent Document 1 describes a configuration in which a perforated metal is provided on part of the wall surface of a heating chamber, and a spacer, a transparent plate (glass), a heat source (halogen lamp), and a reflector are arranged on the perforated metal. Furthermore, Patent Document 2 describes a configuration in which chokes are placed around a heater to suppress leakage of radio waves from the heater to the outside of the refrigerator. Furthermore, Patent Document 3 describes a configuration in which a drawn-out portion is provided on the wall of a heating chamber, and at least one turn of a coil of a coil-shaped heater wire is accommodated within the drawn-out portion. Furthermore, Patent Document 4 describes a configuration in which a heater with a surface coated with a heat-activated deodorizing catalyst is placed on top of a perforated metal, and air is passed from inside the container to outside the container via the perforated metal by an ascending air current, thereby deodorizing the container. Furthermore, Patent Document 5 describes a configuration in which a protective plate is disposed so as to cover the underside of a heater housed in a heater housing chamber, and any object that falls into the heater housing chamber is received by the protective plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-295522 [Patent Document 2] Japanese Patent Application Publication No. 59-150221 [Patent Document 3] Publication No. 5-30315 [Patent Document 4] Japanese Patent Application Publication No. 5-157252 [Patent Document 5] JP 2010-112578 A Summary of the Invention [Problem to be solved by the invention]

[0004] In all of the conventional cooking devices described in the above Patent Documents 1 to 5, it is desired to improve the ease of cleaning the heating chamber while ensuring high heating power.

[0005] The present invention has been made to solve the above-mentioned problems, and has as its main object to provide a cooking device that ensures high heating power while improving the ease of cleaning the heating chamber. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention provides a cooking device comprising a heating chamber for storing food inside a main body, a plurality of tube heaters which penetrate the heating chamber and irradiate the heating chamber, two or more protective glasses for protecting each of the tube heaters, and a reflector for reflecting radiant heat from the tube heaters, the reflector, the tube heaters, and the protective glass being arranged in this order from the outside of the heating chamber. Other means will be described later. Effect of the Invention

[0007] According to the present invention, it is possible to improve the cleaning ability of the heating chamber while ensuring high heating power. [Brief description of the drawings]

[0008] [Figure 1] 1 is an external perspective view of a cooking device according to an embodiment; [Diagram 2] 2 is a cross-sectional view taken along the line X1-X1 of FIG. 1. [Diagram 3] FIG. 4 is a cross-sectional view of the heating unit as viewed from the side. [Figure 4] 13 is a cross-sectional view of a heating unit according to a modified example, as viewed from the side. FIG. [Diagram 5] 4 is a cross-sectional view of an upper portion of a heating chamber of the cooking device as viewed from the side. FIG. [Figure 6] 4 is a cross-sectional view of an upper portion of a heating chamber of the cooking device as viewed from above. FIG. [Figure 7A] FIG. [Figure 7B] This is an exploded view of the chalk. [Figure 7C] FIG. [Figure 7D] FIG. 2 is a bottom view of the choke. [Figure 8] FIG. 13 is a side view showing the state in which the tube heater is held by the choke. [Figure 9] FIG. 4 is a schematic explanatory diagram of an example of the arrangement of heating parts in a cooking device of a first comparative example. [Figure 10] FIG. 13 is a schematic explanatory diagram of an example of an arrangement of a heating unit according to another modified example. [Figure 11] FIG. 11 is a cross-sectional view of a heating unit according to another modified example, as viewed from the side. [Figure 12] FIG. 11 is an explanatory diagram of a problem in a cooking device of a second comparative example that uses a planar heater in a heating section. [Figure 13] 13 is a cross-sectional view of a heating portion of a cooking device according to a modified example using a flat heater, as viewed from the side. FIG. [Figure 14] FIG. 11 is a three-dimensional assembly diagram of a heating unit attachment according to a reference embodiment of the present invention. [Figure 15a] FIG. 13 is a diagram showing an example of screw fastening. [Figure 15b] FIG. 13 is a diagram showing an example of adhesive fixation. [Figure 15c] FIG. 13 is a diagram showing an example of inlay adhesive fixation. [Figure 16a] FIG. 13 is a diagram showing an example of screw fastening with punching metal installed. [Figure 16b] FIG. 13 is a diagram showing an example of adhesive fixation in which punching metal is provided. [Figure 16c] FIG. 13 is a diagram showing an example of fitting adhesive fixation in which punching metal is installed. [Figure 17a] 13A and 13B are diagrams showing an example of screw fastening in which a positioning portion is provided. [Figure 17b] 13A and 13B are diagrams showing an example of adhesive fixation in which a positioning portion is provided. [Figure 17c] 13A and 13B are diagrams showing an example of fitting adhesive fixation in which a positioning portion is provided. [Figure 18a] FIG. 13 is a diagram showing an example of screw fastening in which punching metal and a positioning portion are installed. [Figure 18b] FIG. 13 is a diagram showing an example of adhesive fixation in which a punched metal and a positioning portion are provided. [Figure 18c] FIG. 13 is a diagram showing an example of a fitting adhesive fixation in which punching metal and a positioning portion are provided. [Figure 19] FIG. 13 is a diagram showing how positioning is performed using a recess in a wall surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings. Note that each drawing is merely a schematic illustration to allow a sufficient understanding of the present invention. Therefore, the present invention is not limited to only the illustrated examples. In addition, in each drawing, common or similar components are given the same reference numerals, and duplicated explanations thereof will be omitted.

[0010] The present embodiment is also intended to provide a cooking device that can solve the following problems.

[0011] <(1) First issue> The above-mentioned Patent Document 1 has the following problems. (1a) In Patent Document 1, a transparent plate (glass) is placed between the heat source and the punched metal, and the radiant heat reflected by the non-openings in the punched metal and then reflected by the reflector repeatedly passes through the transparent plate, which reduces the heating performance. In other words, Patent Document 1 has the problem that the amount of heat that should heat the food is absorbed and attenuated by the transparent plate as the radiant heat repeatedly passes through the transparent plate, making it impossible to use the heat effectively.

[0012] <(2) Second issue> The above-mentioned Patent Documents 2 and 3 have the following problems. (2a) Patent Document 2 has the problem that the temperature of the choke is likely to rise because the choke is configured on the wall surface of the heating chamber inside the heating chamber, and the wall of the heating chamber is close to the heater, so the choke is likely to be thermally deformed, changing the choke depth and reducing the electromagnetic wave shielding effect. (2b) In addition, in Patent Document 3, a squeezed portion (positioning portion) is configured on the heating chamber wall, and the relative positions of the heater and the squeezed portion can be determined. However, since the heating chamber wall is close to the heater, the squeezed portion is easily deformed, and the relative positions of the heater and the choke are shifted, resulting in a problem that the electromagnetic wave shielding effect is reduced.

[0013] <(3) Third issue> The above-mentioned Patent Documents 1 and 4 have the following problems. (3a) Patent Document 1 has a problem in that only the radiant heat that passes through the openings (holes) of the punched metal contributes to heating food, resulting in poor heating performance. (3b) Furthermore, Patent Document 4 has the problem that dirt (parts of food) passes through the holes in the perforated metal and penetrates into the heater side, and the invaded dirt cannot be cleaned and removed. In this regard, dirt that adheres to the cooking chamber side of the perforated metal can be removed by wiping it off, but dirt that adheres to the heater side of the perforated metal cannot be removed because it is impossible to insert a hand into the hole and wipe it off.

[0014] <Fourth issue> The above-mentioned Patent Document 5 has the following problems. (4a) Patent Document 5 has a problem in that an air layer formed between the planar heater serving as a heat source and the protective plate may reduce heating performance.

[0015] <Configuration of cooking device> Fig. 1 is an external perspective view of a cooking device 10 according to this embodiment, showing the configuration of a main body 11 of the cooking device 10 as viewed from the front side. In Fig. 1, the main body 11 of the cooking device 10 places food to be heated in a heating chamber 28, and cooks the food using microwaves, heat from a heater, or even superheated steam.

[0016] The outer frame 18 is a cabinet that covers the top surface and the left and right side surfaces of the main body 11 of the cooking device 10. The door 12 opens and closes to put food in and take food out of the heating chamber 28. Closing the door 12 seals the heating chamber 28, preventing leakage of microwaves used to heat food, and sealing in the heat of the heater and superheated steam, enabling efficient heating.

[0017] Handle 19 is attached to door 12 to facilitate opening and closing door 12 and is shaped to be easy to grip with the hand. Glass window 13 is attached to door 12 so that the state of food being cooked can be checked, and is made of glass that can withstand high temperatures caused by heat generated by a heater, etc.

[0018] The input unit 15 is provided on the operation panel 14 on the lower front side of the door 12, and is composed of a display unit 16 that displays the contents input from the operation unit 17 and the progress of cooking, and an operation unit 17 for inputting the heating unit such as microwave heating or heater heating, the heating time, etc., and the heating temperature.

[0019] Fig. 2 is a cross-sectional view taken along the line X1-X1 of Fig. 1. In Fig. 2, machine chamber 20 is provided in the space between heating chamber bottom surface 28a and bottom plate 21 of main body 11, and on bottom plate 21 are mounted magnetron 45 for heating food, a control board on which waveguide 47 connected to magnetron 45 and the like are mounted, various other components, and a fan device for cooling these various components.

[0020] Heating chamber bottom surface 28a has a concave shape approximately in the center, within which rotating antenna 26 is installed, and microwave energy radiated from magnetron 45 flows into the underside of rotating antenna 26 through waveguide 47 and opening 47a through which output shaft 46a of rotating antenna 26 passes, and is diffused by rotating antenna 26 before being radiated into heating chamber 28. Output shaft 46a of rotating antenna 26 is connected to rotating antenna driver 46.

[0021] A heating unit 30 made of a heater is attached to the rear side of the heating chamber top surface 28c of the heating chamber 28.

[0022] The heating chamber 28 has a plurality of weight sensors SN1 provided on its bottom surface 28a, for example, a left weight sensor SN1a and a right weight sensor (not shown) on the left and right sides of the front, and a rear weight sensor SN1b provided in the center of the rear, on which the table plate 24 is placed.

[0023] An infrared sensor SN2 that detects the surface temperature of food materials and a temperature sensor SN3 that detects the internal temperature of heating chamber are provided on the left rear side of heating chamber top surface c of heating chamber .

[0024] The table plate 24 is used for placing food thereon, and is made of a material that is heat resistant so that it can be used for both heater heating and microwave heating, and has good microwave permeability.

[0025] <Heating section configuration> FIG. 3 is a cross-sectional view of the heating unit 30 seen from the side. As shown in FIG. 3, the cooking device 10 includes a plurality of heating units 30 above the top wall 29 of the heating chamber 28. In the example shown in FIG. 3, each heating unit 30 includes a tube heater 31 that irradiates the heating chamber 28 as a heat source, a protective glass 33 that protects the tube heater 31, a reflector 34 that reflects radiant heat T31 from the tube heater 31, and a metal plate 35 with a plurality of through holes 35h. Each heating unit 30 is provided in the order of the protective glass 33, the metal plate 35, the tube heater 31, and the reflector 34 from the inside to the outside of the heating chamber 28. In other words, the cooking device 10 includes a plurality of heating units 30 that are arranged in the order of the reflector 34, the tube heater 31, the metal plate 35, and the protective glass 33 from the outside to the inside of the heating chamber 28. The tube heater 31 may be referred to as a glass tube heater.

[0026] The protective glass 33 is made of a heat-resistant transparent glass material and has a rectangular flat plate shape. The metal plate 35 is a punched metal, a metal mesh, or the like. The metal plate 35 blocks microwaves during microwave heating and suppresses electromagnetic wave leakage to the outside of the oven. The metal plate 35 is arranged to face the upper surface of the protective glass 33. The metal plate 35 is arranged to be in contact (close contact) with or close to the upper surface of the protective glass 33. The end of the metal plate 35 is bent so as to rest on the bent part of the top wall 29. The metal plate 35 has a plurality of through holes 35h in a direction perpendicular to the plate surface of the metal plate 35. The radiant heat irradiated from the tube heater 31 and the radiant heat T31 reflected by the reflector 34 reach the heating chamber 28 through the through holes 35h and the protective glass 33 and the top wall 29, and heats the food stored in the heating chamber 28.

[0027] The reflector 34 is disposed so as to face the top wall 29. The protective glass 33, the metal plate 35, and the tube heater 31 are disposed between the top wall 29 and the reflector 34. The reflector 34 has a bent or curved shape so as to surround the upper side of each tube heater 31. The reflector 34 is fixed to the top wall 29 by screws 36 at any multiple points. However, the reflector 34 may be fixed to the top wall 29 by adhesive instead of the screws 36. The reflector 34 is disposed so as to contact (adhere) or be close to the upper surface of the middle part 29a of the top wall 29. In the example shown in FIG. 3, the reflector 34 is disposed so as to contact (adhere) with the middle part 29a and is fixed by the screws 36. This allows the heating unit 30 to efficiently transfer heat from the reflector 34 to the heating chamber 28 by thermal conduction T11. The intermediate portion 29a is a portion of the top wall 29 between the tube heaters 31.

[0028] The top wall 29 has the above-mentioned intermediate portion 29a and the folded portion 29b. The folded portion 29b is a portion on which the protective glass 33 is placed, and has a folded shape. The top wall 29 has a protrusion 29p near the end of the folded portion, and the protrusion 29p is fitted into the through hole 35h of the metal plate 35 above the protective glass 33 to fix the metal plate 35. The fitting between the protrusion 29p of the top wall 29 and the through hole 35h of the metal plate 35 is preferably provided at intervals of about 20 mm or less along the edges of the four sides of the protective glass 33 for electromagnetic wave shielding. In addition, the wall surface of the top wall 29 on the heating chamber 28 side is painted with a high radiation paint. Therefore, the heat of the top wall 29 can be efficiently sent to the heating chamber 28.

[0029] Cooking device 10 including such heating unit 30 can be easily cleaned because the underside of metal plate 35 (punched metal, metal mesh, or the like) is covered with protective glass 33.

[0030] In addition, the cooking device 10 is configured such that a plurality of protective glasses 33 are arranged in a divided manner on the top wall 29 of the heating chamber 28, and the reflector 34 is arranged so as to be in contact (close contact) or close to the middle portion 29a of the top wall 29. Therefore, the cooking device 10 can efficiently transmit the heat of the reflector 34 to the heating chamber 28 via the middle portion 29a. Since the cooking device 10 can effectively use the heat of the reflector 34 for cooking food, the heating performance can be improved. Furthermore, since the plurality of protective glasses 33 are arranged in a divided manner, the volume of the protective glasses, and therefore the heat capacity, can be reduced, and the amount of heat absorbed by the protective glasses 33 is reduced, so the heating performance can be improved.

[0031] In addition, the cooking device 10 is configured to include a plurality of heating units 30 arranged in the order of a reflector 34, a tube heater 31 (heat source), a metal plate 35 (punched metal, metal mesh, etc.), and a protective glass 33 from the outside to the inside of the heating chamber 28. In this regard, if the positions of the metal plate 35 and the protective glass 33 are reversed, that is, if the protective glass 33 is provided between the tube heater 31 (heat source) and the metal plate 35, the re-reflected wave (radiant heat T31) reflected by the non-opening portion (a portion other than the through hole 35h) of the metal plate 35 and then reflected by the reflector 34 repeatedly passes through the protective glass 33. Therefore, in this configuration, as in Patent Document 1, for example, the amount of heat to heat the food is absorbed and attenuated by the protective glass 33, making it impossible to effectively utilize the heat, thereby reducing the heating performance. In contrast, in the cooking device 10, the protective glass 33 is not provided between the tube heater 31 (heat source) and the metal plate 35 (punched metal, metal mesh, etc.), but is provided below the metal plate 35. Such a cooking device 10 can prevent the re-reflected wave (radiant heat T31) reflected by the non-opening portion (part other than the through-hole 35h) of the metal plate 35 and then reflected by the reflector 34 from repeatedly passing through the protective glass 33. Therefore, the cooking device 10 can efficiently send the re-reflected wave (radiant heat T31) to the heating chamber 28, and can improve the heating performance.

[0032] Moreover, the cooking device 10 is configured such that the top wall 29 of the heating chamber 28 is folded back to contact the protective glass 33. Such a cooking device 10 can be prevented from being a hindrance even if the edge of the top wall 29 hits the user's fingers during cleaning.

[0033] Moreover, in the cooking device 10, the metal plate 35 is fixed to the top wall 29 by fitting the protrusion 29p of the top wall 29 into the through hole 35h of the metal plate 35 above the protective glass 33. In the cooking device 10, the fitting portion between the protrusion 29p of the top wall 29 and the through hole 35h of the metal plate 35 can be arranged in a location hidden from the heating chamber 28. In such a cooking device 10, the fitting portion can be prevented from interfering with cleaning during cleaning. Therefore, the cooking device 10 can make it easy to clean the heating chamber 28.

[0034] Moreover, the cooking device 10 is disposed so that the metal plate 35 is in contact (close contact) with or in close proximity to the protective glass 33. Therefore, the cooking device 10 can efficiently transmit the heat of the metal plate 35 to the heating chamber 28 through the protective glass 33, thereby improving the heating performance.

[0035] Due to these factors, the cooking device 10 can improve the cleaning properties of the heating chamber 28 while ensuring high heating power.

[0036] <Configuration of heating unit according to modified example> The heating unit 30 shown in Fig. 3 can be modified to become a heating unit 30A shown in Fig. 4. Fig. 4 is a cross-sectional view of the heating unit 30A according to the modified example, as viewed from the side.

[0037] As shown in Fig. 4, the heating unit 30A according to the modified example differs from the heating unit 30 shown in Fig. 3 in that the reflecting plate 34 is composed of a reflecting surface portion 34a and a strength portion 34b. The reflecting surface portion 34a is a member that reflects the radiant heat T31 from the tube heater 31. The strength portion 34b is a member that holds the reflecting surface portion 34a.

[0038] The reflecting surface portion 34a is made of a metal material having a high reflectance, such as an aluminum alloy. The strength portion 34b is made of a metal material having a higher strength than the reflecting surface portion 34a. The reflecting surface portion 34a has a high reflectance and excellent plasticity, but is easily deformed. Therefore, the heating portion 30A according to the modified example is configured to hold the reflecting surface portion 34a with the strength portion 34b.

[0039] In the example shown in FIG. 4, the reflecting surface portion 34a is attached to the strength portion 34b by hook-shaped fixing portions 34ba, 34bb, and 34bc provided on the reflecting surface portion 34a.

[0040] Such a heating section 30A can easily form the reflecting surface section 34a into any shape, and can also be supported by the strength section 34b so that the reflecting surface section 34a does not deform.

[0041] As shown in Fig. 4, the cooking device 10 is provided with a heat insulating material 38 above the reflecting plate 34. This allows the cooking device 10 to reduce the amount of heat transferred from the reflecting plate 34 side to the housing outer frame 37 side and to increase the amount of heat transferred from the reflecting plate 34 side to the heating chamber 28 side. Therefore, the cooking device 10 can improve the heating performance.

[0042] <Modifications of the tube heater support structure and electromagnetic wave shielding structure> Cooking device 10 may be configured to include a choke 40 (FIG. 5) for blocking electromagnetic waves according to another modification, instead of metal plate 35 (FIGS. 3 and 4). FIG. 5 is a cross-sectional view of the upper part of the heating chamber of the cooking device as viewed from the side, and FIG. 6 is a cross-sectional view of the upper part of the heating chamber of the cooking device as viewed from the top.

[0043] As shown in Figures 5 and 6, the cooking device 10 is configured to include a heating chamber 28 that stores food, a tube heater 31 that heats the inside of the heating chamber 28, and a choke 40 that blocks electromagnetic waves.

[0044] The heating chamber 28 has a top wall 29 that constitutes the top surface (upper surface). The top wall 29 is configured to include a plate portion 291 extending horizontally, a plate portion 293 extending horizontally at a position higher than the plate portion 291, and a plate portion 292 that connects the plate portions 291 and 293 and extends vertically (up and down). As a result, a step is formed between the plate portions 291 and 293. The lower side in the figure partitioned by the plate portions 291 to 293 is the inside of the heating chamber 28, and the upper side in the figure is the outside of the heating chamber 28.

[0045] The tube heater 31 has a heating element provided in a tube portion 31a formed in a cylindrical shape. An insulating portion 31b is provided at the end of the tube heater 31, and an electric wire (lead wire) 31c is drawn out from the insulating portion 31b. For example, the tube heater 31 may be a quartz tube heater, a halogen heater, a carbon heater, or the like. Note that, although the present embodiment will be described taking as an example a tube heater 31 arranged to extend in the left-right direction, the tube heater may also be arranged to extend in the front-rear direction.

[0046] The plate portion 292 is formed with a through hole 28f through which the tube heater 31 passes in the left-right direction. The through hole 28f is circular and formed to be larger than the outer diameter of the tube heater 31, and is configured so that a gap (space) 29s is formed between the tube heater 31 and the through hole 28f. In other words, the tube heater 31 does not contact the edge of the through hole 28f.

[0047] Choke 40 is formed by bending and cutting a steel plate, and is installed on plate portion 291 located outside heating chamber 28. In other words, choke 40 is fixed to the surface of the heating chamber wall parallel to tube heater 31 (the upper surface of plate portion 291). Note that the electromagnetic waves that go out to the outside of heating chamber 28 through conductor 31d of tube heater 31 and the electromagnetic waves reflected inside choke 40 cancel each other out, thereby suppressing leakage of electromagnetic waves to the outside of heating chamber 28.

[0048] The pipe heater 31 passes through the choke 40, and the insulating portion 31b of the pipe heater 31 is fitted into the hole 41h for support. Since the electric wire 31c extends from the inside of the insulating portion 31b, the electric wire 31c does not come into contact with the hole 41h.

[0049] FIG. 7A is a perspective view showing the choke, FIG. 7B is a development view of the choke, FIG. 7C is a rear view of the choke, and FIG. 7D is a bottom view of the choke. As shown in FIG. 7A, choke 40 is configured by combining plate member 41 provided on the outside and plate member 42 provided on the inside.

[0050] The plate member 41 has an upper surface portion 41a located on the upper surface, a side surface portion 41b extending downward from one opposing edge portion of the upper surface portion 41a, a bottom surface portion 41c extending outward from the lower edge portion of the side surface portion 41b, and a side surface portion 41d (one side of the choke) extending downward from one of the other opposing edges of the upper surface portion 41a.

[0051] As shown in FIG. 7B, each of the plate members 41 and 42 is made of a single plate material. In FIG. 7B, the folding lines when the plate members 41 and 42 are folded are indicated by broken lines. The plate member 41 has side portions 41b, 41b located on one opposing side of the upper surface portion 41a, and a bottom surface portion 41c located on the opposite side of the upper surface portion 41a of the side portion 41b. In addition, the plate member 41 has a side portion 41d located on the other side of the upper surface portion 41a. In addition, the upper surface portion 41a and the side portion 41d are formed to have approximately the same width. The bottom surface portion 41c is formed with a screw insertion hole 41e through which the screw 43 (see FIG. 6) is inserted. In addition, the side surface portion 41d is formed with a substantially semicircular hole 41h penetrating therethrough. As described above, this hole 41h holds the tube heater 31.

[0052] The plate member 42 is disposed inside the plate member 41, and has an upper surface portion 42a, side surfaces 42b, 42b, and bottom surfaces 42c, 42c. The upper surface portion 42a is formed narrower than the upper surface portion 41a and is located in the center. The side surfaces 42b, 42b are located on one opposing side of the upper surface portion 42a. The side surface portion 42b is formed narrower than the side surface portion 41b. The bottom surface portion 42c is located on the opposite side of the side surface portion 42b from the upper surface portion 42a. The bottom surface portion 42c is formed wider than the bottom surface portion 41c. In addition, a screw insertion hole 42d is formed in the bottom surface portion 42c, through which a screw 43 (see FIG. 6) is inserted.

[0053] In the plate member 41, a mountain fold is formed between the top surface portion 41a and the side surface portion 41b, and between the top surface portion 41a and the side surface portion 41d. In the plate member 41, a valley fold is formed between the side surface portion 41b and the bottom surface portion 41c. In the plate member 42, a mountain fold is formed between the top surface portion 42a and the side surface portion 42b, and a valley fold is formed between the side surface portion 42b and the bottom surface portion 42c.

[0054] As shown in Fig. 7C, when viewed from the opposite side to side portion 41d, gate-shaped spaces 41s are formed between upper surface portion 41a and upper surface portion 42a and between side surface portion 41b and side surface portion 42b of choke 40. Bottom surface portion 41c is superimposed on the upper surface of bottom surface portion 42c. Hole 41h is formed to be located within space 42s surrounded by upper surface portion 42a and side surface portions 42b, 42b.

[0055] As shown in FIG. 7D, the choke 40 is assembled by combining the plate members 41 and 42 such that the screw insertion hole 42d of the bottom surface portion 42c and the screw insertion hole 41e (see FIG. 7B) of the bottom surface portion 41c are vertically overlapped. The length of the short side direction (vertical direction in the figure) of the plate member 42 is formed shorter than the length of the short side direction (vertical direction in the figure) of the plate member 41. The bottom surface portion 42c of the plate member 42 is arranged so as to be in surface contact with the upper surface of the plate portion 291 (see FIG. 5), and the screw 43 (see FIG. 6) is inserted from above into the screw insertion holes 41e and 42d and screwed into the plate portion 291, thereby fixing the choke 40 to the plate portion 291. The method of fixing the choke 40 to the plate portion 291 is not limited to screw fixing, and other fixing methods such as welding may be used.

[0056] FIG. 8 is a side view showing the state in which the tube heater is held by the choke. As shown in FIG. 8, a hole 41h is formed in the side surface portion 41d of the plate member 41. The hole 41h is substantially semicircular, and is formed so that the straight portion faces upward and the curved portion faces downward. The insulating portion 31b of the tube heater 31 is fitted into the hole 41h. The electric wire 31c is drawn out from the inside of the insulating portion 31b. By forming the hole 41h substantially semicircular in this way, the tube heater 31 does not rotate around the axial direction of the tube heater 31 in the hole 41h. This prevents the relative position between the tube heater 31 and the choke 40 from changing. The shape of the hole 41h is not limited to a substantially semicircular shape, and may be any other shape such as a square, a triangle, a polygon, or an ellipse, as long as the tube heater 31 does not rotate in the hole 41h.

[0057] 5 and 6, when choke 40 is fixed to plate portion 291, top surface portion 41a and side surface portions 41b, 41b are in approximate contact with plate portion 292. Note that "approximate contact" may mean either contact or no contact, but when no contact is present, it means that the electromagnetic waves do not leak out from the gap between top surface portion 41a and side surface portion 41b and plate portion 292 (for example, 1 mm).

[0058] Furthermore, the tube heater 31 passing through the through hole 28f is disposed in a space 42s (see FIG. 7C) surrounded by the upper surface 42a and the side surfaces 42b, 42b of the choke 40. Furthermore, the tube heater 31 is not in contact with the upper surface 42a and the side surfaces 42b, 42b.

[0059] Furthermore, the top surface portion 42a and the side surface portions 42b, 42b of the plate member 42 are not in contact with the plate portion 292, and a gap 29s is formed. This gap 29s is located on the opposite side (the through-hole 28f side) to the hole 41h (see FIG. 7A).

[0060] Additionally, insulating portion 31b at the end of tube heater 31 is fitted and held in hole 41h formed in choke 40. In this manner, tube heater 31 is not supported by top wall 29, but is supported by hole 41h in choke 40. In other words, tube heater 31 is supported only by choke 40. Note that in this embodiment, only one side of tube heater 31 has been illustrated and described, but the other side has a similar structure, a choke is provided, and tube heater 31 is supported only by the choke.

[0061] Furthermore, when the heating chamber 28 is heated, the top wall 29 becomes hot because the plate portions 292 and 293 are positioned close to the tube heater 31. On the other hand, the plate portion 291 becomes cold because it is positioned away from the tube heater 31. In this embodiment, the choke 40 is disposed outside the heating chamber 28, so the choke 40 is less susceptible to the heat from the tube heater 31. Furthermore, since the choke 40 is disposed on the plate portion 291, which becomes cold, the choke 40 is less susceptible to the heat from the tube heater 31. Furthermore, since the choke 40 also serves to position the tube heater 31, even if the top wall 29 is deformed by the heat from the tube heater 31 and the position of the choke 40 is shifted, the relative positions of the choke 40 and the tube heater 31 do not change.

[0062] <Another Modification of the Heating Section> The cooking device 10 may be configured to include a heating section 30B (FIGS. 10 and 11) according to another modification, instead of the heating section 30 (FIG. 3) or the heating section 30A (FIG. 3). Here, in order to easily explain the configuration of the heating section 30B, first, the configuration of the heating section 30Za in the cooking device 10Za of the first comparative example will be explained using FIG. 9, and then the configuration of the heating section 30B will be explained using FIG. 10 and FIG. 11. FIG. 9 is a schematic explanatory diagram of an example of the arrangement of the heating section 30Za in the cooking device 10Za of the first comparative example. FIG. 10 is a schematic explanatory diagram of an example of the arrangement of the heating section 30B according to another modification. FIG. 11 is a cross-sectional view of the heating section 30B according to another modification, seen from the side.

[0063] 9, the cooking device 10Za of the first comparative example is configured to include a heating chamber 28 below the inside of the housing outer frame 37, a heating unit 30Za above the heating chamber 28, and a heating chamber top surface 28c separating the heating unit 30Za from the heating chamber 28. The heating unit 30Za is disposed in a space above the heating chamber top surface 28c, includes a tube heater 31 as a heat source, and sends heat to the heating chamber 28 via a through hole 28h provided in the heating chamber top surface 28c.

[0064] In contrast, as shown in Fig. 10, the cooking device 10 includes a heating chamber 28 below the inside of the housing outer frame 37, a heating chamber top surface 28c above the heating chamber 28, and a pipe heater 31 of the heating unit 30B is incorporated into the heating chamber top surface 28c. The pipe heater 31 of the heating unit 30B is configured to be recessed into the heating chamber 28 side from the lower surface of the heating chamber top surface 28c. Therefore, the heating unit 30B can send heat to the heating chamber 28 more efficiently than the heating unit 30Za of the cooking device 10Za of the first comparative example shown in Fig. 9, and can improve heating performance.

[0065] Fig. 11 shows an enlarged view of the configuration of region R11 shown in Fig. 10. As shown in Fig. 11, the heating unit 30B has a tube heater 31 as a heat source. A heater guard 51 and a reflector 52 are provided around the tube heater 31. The heater guard 51 is disposed on the lower surface side of the tube heater 31, and is a guard member that protects at least the heating chamber 28 side of the tube heater 31. The reflector 52 is disposed on the upper surface side of the tube heater 31, and is a member that reflects the radiant wave irradiated from the tube heater 31.

[0066] The heater guard 51 has a rounded portion 51a that is rounded (curved) concentrically with the tube heater 31 in a side view. The rounded portion 51a is an area that is arranged so as to be in contact (close contact) with or close to the surface of the tube heater 31. A plurality of through holes 51h are provided in the rounded portion 51a of the heater guard 51. The through holes 51h are arranged so as to radiate from the center of the tube heater 31, and block microwaves during microwave heating and suppress electromagnetic wave leakage to the outside of the oven.

[0067] The heater guard 51 and the reflector 52 have a rounded shape concentric with the tube heater 31, and each end extends horizontally. The horizontally extending parts are fixed to the top wall 29 of the heating chamber 28 by screws 36.

[0068] The cooking device 10B is configured such that the pipe heater 31 of the heating section 30B is inserted into the heating chamber inner space 28in side from the lower surface of the top wall 29. Therefore, the cooking device 10B can efficiently send radiant heat irradiated from the pipe heater 31 to the heating chamber inner space 28in side, thereby improving heating performance.

[0069] The cooking device 10B is provided with a reflector 52 arranged on the upper surface side of the tube heater 31 so as to be in contact (close contact) with or close to the tube heater 31. The cooking device 10B is further provided with a heater guard 51 arranged on the lower surface side of the tube heater 31 so as to be in contact (close contact) with or close to the tube heater 31, and the heater guard 51 is arranged so as to be in partial contact (close contact) with the top wall 29 or close to the top wall 29. This allows the cooking device 10B to reduce the amount of heat transferred from the reflector 52 side to the heating chamber outer space 28out side and to increase the amount of heat transferred from the heater guard 51 side to the heating chamber inner space 28in side.

[0070] In addition, in the cooking device 10B, the heater guard 51 is configured as a perforated member having through holes 51h, and the top wall 29 is configured as a non-perforated member having no through holes 51h, and the heater guard 51 and the top wall 29 are configured as separate parts. In this cooking device 10B, the heater guard 51, which is a perforated member, is the only highly heat-resistant part, thereby reducing the cost of parts.

[0071] Moreover, a high radiation paint 29c is provided on the lower surface side of the top wall 29. This allows the cooking device 10B to further improve the heating performance. Also, the cooking device 10B can apply the high radiation paint 29c, which is weak against heat, to the top wall 29, which is a non-porous member. Such a cooking device 10B can prevent the top wall 29 from receiving the direct waves of the tube heater 31, thereby suppressing local temperature rise. Also, the cooking device 10B can improve the heating performance because the high radiation paint 29c can highly efficiently reflect the heat waves of the tube heater 31.

[0072] <Yet another modified example of the heating section> The cooking device 10 may be configured to include a heating section 30C (FIG. 13) according to another modified example instead of the heating section 30 (FIG. 3) or the heating section 30A (FIG. 3). Here, in order to easily explain the configuration of the heating section 30C, the configuration of the heating section 30Zb in the cooking device 10Zb of the second comparative example will be explained using FIG. 12, and then the configuration of the heating section 30C will be explained using FIG. 13. The heating section 30Zb (FIG. 12) and the heating section 30C (FIG. 13) each use a planar heater as a heat source. FIG. 12 is an explanatory diagram of a problem in the cooking device 10Zb of the second comparative example in which the heating section 30Zb uses a planar heater. FIG. 13 is a cross-sectional view of the heating section 30C of the cooking device 10 according to the modified example using a planar heater, viewed from the side. The cooking device 10Zb of the second comparative example using a planar heater and the cooking device 10 according to the modified example both heat food by radiant heating from the planar heater from above the food.

[0073] As shown in FIG. 12, the cooking device 10Zb of the second comparative example includes a planar heater 32, a heat insulating material 63, and a heater presser 64 on the top wall 29. The planar heater 32, the heat insulating material 63, and the heater presser 64 are fixed to the upper wall 294a of the top wall 29 with screws 65. The planar heater 32 is configured such that a nichrome wire 62 is sandwiched between mica (mica) 61 and mica (mica) 61, and generates heat when power is supplied from a power source 66 to the nichrome wire 62. In the heating unit 30Zb of the cooking device 10Zb, the upper wall 294a of the top wall 29 is deformed in the thermal deformation direction F11 (downward) by the heating of the planar heater 32, and an air layer 67 may be formed between the top wall 29 and the planar heater 32. When the upper wall 294a of the top wall 29 is deformed in the thermal deformation direction F11 (downward), the planar heater 32 is separated from the top wall 29. Therefore, the heating performance of the cooking device 10Zb may be reduced, as in Patent Document 5, for example.

[0074] As shown in FIG. 13, a heating section 30C of a cooking device 10 differs from a heating section 30Zb of such a cooking device 10Zb in that the top wall 29 is composed of an upper wall 295a and a side wall 295b.

[0075] That is, the heating section 30C of the cooking device 10 is configured such that the upper wall 295a and the side wall 295b are separate bodies. Also, the heating section 30C of the cooking device 10 is configured such that the upper wall 295a and the planar heater 32 are in close contact with each other.

[0076] In the heating unit 30C, the upper wall 295a and the planar heater 32 are in close contact with each other, but a gap may be formed between the upper wall 295a and the planar heater 32, and an air layer 67 may be formed in the gap. However, even if the air layer 67 is formed, the heating unit 30C has the upper wall 295a and the side wall 295b separately configured, and the portion shown as the region R21 is divided, so that the thermal deformation of the upper wall 295a caused by the heating of the planar heater 32 can be released in the thermal deformation direction F12 (horizontal direction). Therefore, the heating unit 30C can maintain the distance between the upper wall 295a and the planar heater 32, and can maintain the heating efficiency.

[0077] In addition, the heating unit 30C can improve the heating performance because the upper wall 295a and the planar heater 32 are in close contact with each other, and thus the radiant heat can be efficiently sent from the upper wall 295a to the heating chamber 28. In addition, the heating unit 30C can improve the cleaning performance because the upper wall 295a does not have a through hole.

[0078] The cooking device 10 including such a heating section 30C can improve the cleaning properties of the heating chamber 28 while ensuring high heating power.

[0079] The cooking device 10 according to the present embodiment is intended to ensure high heating power while improving the ease of cleaning the heating chamber 28. The cooking device 10 according to the present embodiment has the following features.

[0080] <Main features of the cooking device to solve the first problem> (1) As shown in Fig. 3, the cooking device 10 according to this embodiment includes a heating chamber 28 that stores food inside a main body 11, a plurality of tube heaters 31 that penetrate the heating chamber 28 and irradiate the heating chamber 28, two or more protective glasses 33 that protect each of the tube heaters 31, and a reflector 34 that reflects radiant heat T31 from the tube heaters 31. In the cooking device 10, the reflector 34, the tube heaters 31, and the protective glasses 33 are arranged in this order from the outside of the heating chamber 28.

[0081] In the heating cooker 10 according to this embodiment, multiple protective glasses 33 are arranged in a divided manner, so that the volume of the protective glass and therefore the heat capacity can be reduced, and the amount of heat absorbed by the protective glass 33 is reduced, thereby improving heating performance.

[0082] (2) As shown in FIG. 3, in the cooking device 10 according to this embodiment, the reflecting plate 34 is configured to come into contact with the top wall 29 at the intermediate portion 29a between adjacent tube heaters 31.

[0083] The cooking device 10 according to this embodiment can efficiently transmit heat from the reflector 34 to the heating chamber 28 via the intermediate portion 29a. Therefore, the cooking device 10 can improve the cleaning ability of the heating chamber 28 while ensuring high heating power.

[0084] (3) As shown in FIG. 3, in the cooking device 10 according to this embodiment, the top wall 29 is folded back at the folding back portion 29b and comes into contact with the protective glass 33.

[0085] The cooking device 10 according to this embodiment can be prevented from being a hindrance even if the edge of the top wall 29 hits the user's fingers during cleaning.

[0086] (4) As shown in FIG. 3, the cooking device 10 according to this embodiment further includes a metal plate 35 having a through hole 35h, and is arranged in the following order from the outside to the inside of the heating chamber 28: a reflector 34, a tube heater 31, the metal plate 35, and a protective glass 33.

[0087] The cooking device 10 according to this embodiment can prevent the re-reflected wave (radiant heat T31) from repeatedly passing through the protective glass 33. Therefore, the cooking device 10 can efficiently send the re-reflected wave (radiant heat T31) to the heating chamber 28, improving the heating performance. In addition, the cooking device 10 can easily be cleaned because the underside of the metal plate 35 (punched metal, metal mesh, etc.) is covered with the protective glass 33.

[0088] (5) As shown in FIG. 3, in the cooking device 10 according to this embodiment, the metal plate 35 is fitted into the top wall 29 above the protective glass 33 and is positioned so as to be in contact (close contact) with or adjacent to the protective glass 33.

[0089] In the cooking device 10 according to this embodiment, the fitting portion between the metal plate 35 and the top wall 29 does not get in the way of cleaning. This makes it easy to clean the cooking device 10. In addition, in the cooking device 10, the metal plate 35 comes into contact with the protective glass 33, so that the heat of the metal plate 35 can be efficiently sent to the heating chamber 28 through the protective glass 33, improving the heating performance.

[0090] (6) As shown in FIG. 4, in the cooking device 10 according to this embodiment, the reflecting plate 34 may be configured to have a reflecting surface portion 34a that reflects radiant heat T31 from the tube heater 31, and a strength portion 34b that holds the reflecting surface portion 34a.

[0091] In the cooking device 10 according to this embodiment, the reflecting surface portion 34a can be easily formed into any shape, and the reflecting surface portion 34a can be held by the strength portion 34b so as not to be deformed.

[0092] (7) As shown in FIG. 4, the cooking device 10 according to this embodiment has a heat insulating material 38 above the reflecting plate 34.

[0093] The cooking device 10 according to this embodiment can reduce the amount of heat transferred from the reflecting plate 34 to the housing outer frame 37 and increase the amount of heat transferred from the reflecting plate 34 to the heating chamber 28. Therefore, the cooking device 10 can improve the heating performance.

[0094] <Main features of the cooking device to solve the second problem> (1) As shown in Figures 5 and 6, the cooking device 10 of this embodiment includes a heating chamber 28 for storing food inside the main body 11, a tube heater 31 arranged to penetrate a top wall 29 (heating chamber wall) and heat the inside of the heating chamber 28, and a choke 40 for blocking electromagnetic waves leaking from a through hole 28f penetrating the top wall 29 (heating chamber wall). The choke 40 is installed on a plate portion 291 (surface of the heating chamber wall) parallel to the tube heater 31 outside the heating chamber 28, and holds the tube heater 31 on a side portion 41d (one surface) of the choke 40.

[0095] In the cooking device 10 according to the present embodiment, the choke 40 is disposed outside the heating chamber 28, so that the choke 40 is less susceptible to the effects of heat within the heating chamber 28. Furthermore, since the choke 40 also serves to position the tube heater 31, even if the position of the choke 40 shifts due to the effect of thermal deformation of the plate portion 291 (wall surface) of the heating chamber 28, the relative positions of the tube heater 31 and the choke 40 do not change, so that it is possible to maintain the electromagnetic wave shielding effect. Furthermore, since the choke 40 is installed on the plate portion 291 (wall surface) of the heating chamber 28 parallel to the tube heater 31, the plate portion 291 (wall surface) is installed on the plate portion 291 (wall surface) that is at a low temperature and away from the tube heater 31, so that the plate portion 291 (wall surface) is less susceptible to thermal deformation, and it is possible to obtain the electromagnetic wave shielding effect.

[0096] (2) As shown in FIG. 8, in the cooking device 10 of this embodiment, the end of the tube heater 31 is held in a hole 41h formed through the choke 40, and the hole 41h has a shape (e.g., an approximately semicircular shape) that prevents the tube heater 31 from rotating.

[0097] In the cooking device 10 according to this embodiment, the position of the pipe heater 31 relative to the choke 40 does not change, so that the radio wave shielding effect can be obtained.

[0098] (3) As shown in Figs. 5 and 6, in the cooking device 10 according to this embodiment, the pipe heater 31 is disposed with a gap 29s between it and the through-hole 28f.

[0099] The cooking device 10 according to this embodiment can prevent the heat from the pipe heater 31 from being transmitted to the top wall 29 (heating chamber wall).

[0100] <Main features of the cooking device to solve the third problem> (1) As shown in Fig. 11, the cooking device 10B according to this embodiment includes a heating chamber 28 that stores food inside a main body 11, a heating section 30B that irradiates the heating chamber 28, and a heater guard 51 that is disposed between a wall surface of the heating chamber 28 (a top wall 29 in the illustrated example) and a pipe heater 31 that is a heat source of the heating section 30B and serves as a guard member that protects at least the heating chamber 28 side of the pipe heater 31. The heater guard 51 has a plurality of through holes 51h, and is in partial contact with the wall surface of the heating chamber 28 or is disposed close to the wall surface of the heating chamber 28.

[0101] In the cooking device 10B according to the present embodiment, the heater guard 51 is disposed in partial contact with the wall surface of the heating chamber 28 or in close proximity to the wall surface of the heating chamber 28. In the cooking device 10B, the amount of heat transferred from the heater guard 51 to the wall surface of the heating chamber 28 can be increased. Therefore, the cooking device 10B can efficiently send heat to the heating chamber 28. Furthermore, even if food adheres to the through hole 51h of the heater guard 51 and causes clogging, the cooking device 10B can cook the food to completion. This eliminates the need for cleaning to remove dirt from the food. Therefore, the cooking device 10B can improve the cleanability of the heating chamber 28 while ensuring high heat. Furthermore, the cooking device 10B can protect the tube heater 31 with the heater guard 51.

[0102] (2) As shown in FIG. 11, in a cooking device 10B according to this embodiment, a heater guard 51 has through holes 51h only in an area close to the surface of the tube heater 31.

[0103] In the cooking device 10B according to the present embodiment, the area where the through-hole 51h becomes clogged due to adhesion of food can be limited, and therefore cleaning properties can be improved.

[0104] (3) As shown in FIG. 11, in the heating cooker 10B of this embodiment, the heater guard 51 is configured as a perforated member having through holes 51h, and the wall surface of the heating chamber 28 (the top wall 29 in the illustrated example) is configured as a non-perforated member not having through holes 51h, and the heater guard 51 and the wall surface of the heating chamber 28 are configured as separate parts.

[0105] In the cooking device 10B according to the present embodiment, only the heater guard 51, which is a perforated member, is a high heat-resistant component, thereby reducing the cost of the components. In addition, the cooking device 10B can apply high radiation paint 29c, which is weak against heat, to the wall surface of the heating chamber 28, which is a non-perforated member. Since the cooking device 10B can prevent the wall surface of the heating chamber 28 from receiving the direct waves of the tube heater 31, it can suppress local temperature rise. Furthermore, the cooking device 10B can improve heating performance since the high radiation paint 29c can reflect the radiant heat of the tube heater 31 with high efficiency.

[0106] (4) As shown in FIG. 11, a cooking device 10B according to this embodiment includes a reflecting plate 52 at a position where the tube heater 31 is sandwiched between the heating chamber .

[0107] The heating cooker 10B of this embodiment can improve heating performance by reflecting the radiant heat radiated from the tube heater 31 to the heating chamber outer space 28out side by the reflecting plate 52 to the heating chamber inner space 28in side.

[0108] (5) As shown in Fig. 11, in the cooking device 10B according to the present embodiment, the pipe heater 31 has a substantially circular cross-sectional shape in side view. The heater guard 51 has a rounded portion 51a that is rounded (curved) concentrically with the pipe heater 31 in side view, and through holes 51h arranged radially from the center of the pipe heater 31 are provided in the rounded portion 51a.

[0109] The cooking device 10B according to this embodiment is configured to have through holes 51h provided along the radiation direction of radiant heat emitted from the tube heater 31. The cooking device 10B can reduce the amount of radiant waves reflected by the inner wall of the heater guard 51 and efficiently send the radiant waves to the heating chamber side space 28in, thereby improving the heating performance.

[0110] <Main features of the cooking device to solve the fourth problem> (1) As shown in Fig. 13, the cooking device 10 according to this embodiment includes a heating chamber 28 that stores food inside a main body 11, and a planar heater 32 that irradiates the heating chamber 28. The heating chamber 28 has an upper wall 295a and a side wall 295b that are configured as separate bodies, and the upper wall 295a and the planar heater 32 are in close contact with each other.

[0111] The cooking device 10 according to this embodiment can release the thermal deformation of the upper wall 295a caused by the heating of the planar heater 32 in the thermal deformation direction F12 (horizontal direction). Therefore, the cooking device 10 can maintain the distance between the upper wall 295a and the planar heater 32, and can maintain the heating efficiency. In addition, the cooking device 10 does not have a through hole in the upper wall 295a, and therefore can improve the cleaning property. Therefore, the cooking device 10 can improve the cleaning property of the heating chamber 28 while ensuring high heating power.

[0112] (2) As shown in Fig. 13, the cooking device 10 according to this embodiment further includes a heater presser 64 that presses down and fixes the planar heater 32 from above. The heater presser 64 is configured to surround the side and top surfaces of the planar heater 32.

[0113] In the cooking device 10 according to this embodiment, the heater presser 64 can prevent leakage of electromagnetic waves.

[0114] (3) As shown in FIG. 13, in the cooking device 10 according to the present embodiment, the heater presser 64 is fixed to the side wall 295b.

[0115] In the cooking device 10 according to this embodiment, the planar heater 32 can be firmly fixed.

[0116] <Example 1 of Heating Section Variation (Reference Example 1)> Below, a modified example of the heating unit will be described as a reference embodiment. Fig. 14 shows a three-dimensional assembly diagram of the heating unit attachment of a cooking device according to a reference embodiment 1 of the present invention. The lower side of Fig. 14 shows the heating chamber upper wall surface 29 (heating chamber top surface: hereinafter simply referred to as the wall surface) which forms the heating chamber 28 of the cooking device 1, and an opening 296c1 is formed in the wall surface 29. Protective glass 331 is positioned above the position of opening 296c1 to cover it. Also, mounting holes 296c2 and 296c3 are provided around opening 296c1.

[0117] Two sets of fasteners 361b are arranged on the upper surface of the protective glass 331 at the left and right positions in the figure, and the protective glass 331 is sandwiched between the wall surface 29 and the fasteners 361b, and the protective glass 331 is fixed to the wall surface 29 by using the holes of the fasteners 361b1 and the mounting holes 296c2 around the opening 296c1. Also, a reflective box 341 that houses the heater 31 is positioned on the upper part of the protective glass 1a, and the reflective box 341 is fixed to the wall surface 29 by using the holes of the reflective box 341 formed in the mounting portion 341a of the reflective box 341 and other mounting holes 296c3 around the opening 296c1.

[0118] In the example of Figure 14, mounting holes are provided and fastened with bolts and nuts, but it is also possible to fasten them directly with screws. In this article, these are collectively referred to as screw fastening.

[0119] With this configuration, the protective glass 331, the heater 31, and the reflector box 341 are arranged in this order on the wall surface 29 of the heating chamber 28 outside the heating chamber. Fig. 14 shows one example of attachment, and the attachment method of the protective glass 331 and the reflector 341 is not limited to that shown in Fig. 14. What is important is that they can be arranged in this order, and for example, they can be arranged as shown in Fig. 15a, Fig. 15b, and Fig. 15c.

[0120] Fig. 15a shows an example of screw fastening as in Fig. 14, in which protective glass 331 is fixed to wall surface 29 by screwing with bolts and nuts using hole 361b of fastener 361 and mounting hole 296c2 around opening 291, and reflective box 341 is fixed to wall surface 29 by screwing with bolts and nuts using hole 341b of reflective box 341 and other mounting holes 296c3 around opening 296c2. It is preferable that reflector 341 be formed in advance as a unit (reflective box) incorporating heater 31.

[0121] In Figures 15b and 15c, fixed portion 361c between wall surface 29 and protective glass 341 is adhesively fixed with silicone, while in Figure 4c, protective glass 331 is fitted into opening 296c1 and fixed portion 361c is adhesively fixed with silicone.

[0122] According to the first embodiment of the present invention, protective glass 331 is provided on a part of wall surface 29 of heating chamber 28 to prevent moisture, oil or seasonings from food from contaminating the heater, and even if protective glass 331 is contaminated, it can be cleaned with a cloth or the like from inside heating chamber 28. In addition, since there are few projections and recesses, cleaning is easy, and the transparent plate can be cleaned from the inside of the heating chamber, providing excellent cleanability.

[0123] <Example 2 of changes in heating section (Reference Example 2)> In the first reference embodiment, a method in which no punching metal is provided has been described. However, depending on the heater 31, it may be better to provide a punching metal function. In the cooking device, a microwave power source is provided on the underside of the heating chamber, but some heaters generate heat by microwaves, so in this case it is better to provide a punching metal function. Specifically, in the case of a carbon heater, a halogen heater, a graphite heater, or a quartz tube heater, it is better to provide a punching metal function.

[0124] 16a, 16b, and 16c show the configurations of Fig. 15a, 15b, and 15c in which a punched metal 351 is provided, and in each case, the punched metal 351 is disposed between the protective glass 331 and the heater 31. According to the reference embodiment 2 of the present invention, it is possible to prevent the heater from being heated by microwaves while maintaining the cleaning property.

[0125] <Example 3 of changes in heating section (Reference Example 3)> In the third embodiment, the positioning when performing the three-dimensional assembly of FIG. 14 will be described. In some cases, it may be preferable to additionally provide a positioning portion for the protective glass on the wall surface 29 of the heating chamber. In FIG. 17a, FIG. 17b, and FIG. 17c, the positioning portion 361d is provided on the wall surface 29 in each of the configurations of FIG. 15a, FIG. 15b, and FIG. 15c. In addition, in FIG. 18a, FIG. 18b, and FIG. 18c, the positioning portion 361d is provided on the wall surface 29 in each of the configurations of FIG. 16a, FIG. 16b, and FIG. 16c. For example, by providing the convex positioning portion 361d on the wall surface 29 so as to surround the outer periphery of the fixing portion 361c, the positioning of the protective glass 331 is facilitated, and the assembly of the heating portion is improved.

[0126] <Change Example 4 of Heating Section (Reference Example 4)> Reference Example 4 is also a device for facilitating positioning when performing the three-dimensional assembly of FIG. 14. In Reference Example 4, a convex positioning portion 361d is provided on the wall surface 29, but in Reference Example 4, as shown in FIG. 19, a recess 29t is provided on the wall surface 29 of the heating chamber. The wall surface 29 of the heating chamber may be provided with a recess 29t into which protective glass is fitted. By fitting the protective glass into this recess 29t, the positioning of the protective glass is made easy and the assembly of the heating unit is improved. The protective glass fitted into the recess 29t can be fixed by screwing or adhesive.

[0127] The present invention is not limited to the above-described embodiment, and includes various modified examples. For example, the above-described embodiment has been described in detail to easily explain the present invention, and is not necessarily limited to having all of the configurations described. In addition, it is possible to replace a part of the configuration of the embodiment with another configuration, and it is also possible to add another configuration to the configuration of the embodiment. In addition, it is possible to add, delete, or replace a part of each configuration with another configuration. [Explanation of symbols]

[0128] 10,10Za,10Zb Heating cooker 11 Main unit 28 Heating chamber 28f,28h,35h,51h through hole 28in heating chamber inner space 28out Space outside heating chamber 29 Top wall 29a middle part 29b Folded part 29c high radiation paint 29p protrusion 29s Gap (space) 291,292,293 Board part 294a,295a Upper wall 295b side wall 30,30A,30B,30C,30Za,30Zb Heating section 31 Tube heater (heat source) 31a pipe section 31b Insulation part 31c Electric wire (lead wire) 32 Planar heater (heat source) 33 Protective Glass 34,52 Reflector 34a Reflective surface section 34b Strength section 34ba,34bb,34bc fixed part 35 Metal plate 36,43 Screw 37 Outer frame of the housing 38 Insulation 40 Chalk 41,42 Plate members 41a, 42a Top part 41b,42b Side part 41c,42c Bottom part 41d Side part (one side of the chalk) 41e Screw insertion hole 41h hole 41s space 42d Screw insertion hole 42s space 51 Heater guard (guard material) 51a Round section 61 Mica 62 Nichrome Wire 63 Insulation 64 Heater holder 65 Screw 66 Power supply 67 Air Layer T11 Thermal Conduction T31 radiant heat

Claims

1. A heating chamber for storing food inside the main body; A plurality of tube heaters that penetrate the heating chamber and irradiate the heating chamber; Two or more protective glasses for protecting each of the tube heaters; A reflector that reflects radiant heat from the tube heater, The reflector, the tube heater, and the protective glass are provided in this order from the outside of the heating chamber. A heating cooker characterized by the above.

2. The cooking device according to claim 1, The reflector is in contact with a top wall of the heating chamber between adjacent tube heaters. A heating cooker characterized by the above.

3. The cooking device according to claim 1, The top wall is folded back to contact the protective glass. A heating cooker characterized by the above.

4. The cooking device according to claim 1, Further comprising a metal plate having a through hole; The reflector, the tube heater, the metal plate, and the protective glass are provided in this order from the outside to the inside of the heating chamber. A heating cooker characterized by the above.

5. The cooking device according to claim 1, Further comprising a metal plate having a through hole; The metal plate is fitted to the top wall above the protective glass and is disposed so as to be in contact with or adjacent to the protective glass. A heating cooker characterized by the above.

6. The cooking device according to claim 1, The reflector has a reflecting surface that reflects radiant heat from the tube heater and a strength portion that holds the reflecting surface. A heating cooker characterized by the above.

7. The cooking device according to claim 1, A heat insulating material is provided above the reflector. A heating cooker characterized by the above.

Images