Heating cooker

Abstract

To provide a heating cooker having shielding performance and transmission performance.SOLUTION: A heating cooker comprises: a heating chamber; an infrared heater that emits infrared radiation directed inward from the outside of the heating chamber; a microwave generation part that emits a microwave directed inward from the outside of the heating chamber; a first plate-like member with a plurality of through-holes, which is positioned between the infrared heater and the heating chamber; and a second plate-like member with a plurality of through-holes, which is positioned away from the first plate-like member between the first plate-like member and the infrared heater.SELECTED DRAWING: Figure 10

Description

[Technical field]

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

[0002] In Patent Document 1, the cooking device heats an object to be heated in a heating chamber with high frequency waves generated by a high frequency oscillator or infrared rays generated by an infrared heater. Some infrared heaters are easily affected by high frequency waves. Therefore, in Patent Document 1, the infrared heater is shielded from the heating chamber by a reflector when heating with high frequency waves. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-215778 A Summary of the Invention [Problem to be solved by the invention]

[0004] In some cooking appliances, a metal plate member with holes is fixed between the infrared heater and the heating chamber. This type of plate member is required to have the ability to block high frequency waves during high frequency heating and the ability to transmit infrared rays during infrared heating.

[0005] An object of the present invention is to provide a cooking device that has high frequency shielding properties and infrared transmission properties even when using an infrared heater that is susceptible to the effects of high frequency waves. [Means for solving the problem]

[0006] According to one aspect of the present invention, a cooking device includes a heating chamber, an infrared heater, a microwave generating unit, a first plate-shaped member, and a second plate-shaped member. The infrared heater radiates infrared rays from the outside of the heating chamber to the inside. The microwave generating unit radiates microwaves from the outside of the heating chamber to the inside. The first plate-shaped member is located between the infrared heater and the heating chamber, and has a plurality of through holes. The second plate-shaped member is located between the first plate-shaped member and the infrared heater, away from the first plate-shaped member, and has a plurality of through holes. Effect of the Invention

[0007] According to the cooking device of the present invention, even when an infrared heater that is easily affected by high frequency waves is used, it is possible to provide a cooking device that has high frequency shielding properties and infrared transmission properties. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a cooking device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a perspective view showing the cooking device with the housing removed according to the embodiment. [Diagram 3] FIG. 2 is a perspective view showing the cooking device with the housing removed according to the embodiment. [Figure 4] FIG. 2 is a perspective view showing a door according to the embodiment. [Diagram 5] 1 is a diagram showing a schematic cross section of a cooking device according to an embodiment of the present invention; [Figure 6] FIG. 2 is a schematic cross-sectional view of a blower unit according to the embodiment. [Figure 7] FIG. 2 is a perspective view showing the cooking device with the housing removed according to the embodiment. [Figure 8] FIG. 2 is a perspective view showing the cooking device with the housing removed according to the embodiment. [Figure 9] 1 is a block diagram showing a configuration of a cooking device according to an embodiment of the present invention; [Figure 10]6 is an enlarged cross-sectional view of a first heater and a heat shielding / transmitting portion shown in FIG. 5. FIG. [Figure 11] 11 is a perspective view of the heat shielding / transmitting portion shown in FIG. 10 as viewed diagonally from above front right. [Figure 12] 11 is a bottom view of the heat shielding / transmitting part shown in FIG. 10. FIG. [Figure 13] 11 is a graph showing wavelength characteristics of a first heater section having a metal film and a first heater section having no metal film. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of a cooking device according to the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0010] A cooking device 100 according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a perspective view showing the cooking device 100. Fig. 1 also shows the appearance of the cooking device 100 as seen from above, diagonally forward and to the right. As shown in Fig. 1, the cooking device 100 cooks an object to be heated. The object to be heated is, for example, food. The cooking device 100 includes a housing 10, a door 20, and an operation panel 30.

[0011] The operation panel 30 is a substantially rectangular plate-like member. The operation panel 30 receives operations from a user. The operations include, for example, a cooking method for cooking an object to be heated. Specifically, the operation panel 30 has a display unit. The display unit displays various types of information. Specifically, the display unit includes a liquid crystal panel.

[0012] In this embodiment, the side where the operation panel 30 of the cooking device 100 is arranged is defined as the front side of the cooking device 100, and the opposite side (back side) is defined as the rear side of the cooking device 100. In addition, the right side when the cooking device 100 is viewed from the front side is defined as the right side of the cooking device 100, and the opposite side is defined as the left side of the cooking device 100. In addition, in a direction perpendicular to the front-rear direction and left-right direction of the cooking device 100, the side where the operation panel 30 is arranged is defined as the upper side of the cooking device 100, and the opposite side (bottom side) is defined as the lower side of the cooking device 100. Note that these directions do not limit the direction of the cooking device 100 of the present invention when used. In this embodiment, the first direction D1 is the upward direction. The second direction D2 is the forward direction. The third direction D3 is the leftward direction.

[0013] The housing 10 is a box-shaped member. Specifically, the housing 10 has a right outer wall 11, a left outer wall 12, an upper outer wall 13, a lower outer wall 14, and a rear outer wall 15. The rear outer wall 15 intersects with the second direction D2. The right outer wall 11 and the left outer wall 12 face each other in the third direction D3. The upper outer wall 13 and the lower outer wall 14 face each other in the first direction D1.

[0014] Next, the cooking chamber 50 will be described with reference to Figs. 2 and 3. Figs. 2 and 3 are perspective views showing the cooking device 100 with the housing 10 removed. Fig. 2 shows the appearance of the cooking device 100 viewed from above and diagonally to the front right. Fig. 3 shows the appearance of the cooking device 100 viewed from below and diagonally to the front right. As shown in Figs. 2 and 3, the cooking device 100 further includes the cooking chamber 50, a front wall 60, and a placement portion 70. The cooking chamber 50 is an example of the "heating chamber" of the present invention.

[0015] The cooking chamber 50 is accommodated in the housing 10. The cooking chamber 50 accommodates an object to be heated. The shape of the cooking chamber 50 is, for example, a substantially rectangular parallelepiped. Specifically, the cooking chamber 50 has a right wall 51, a left wall 52, an upper wall 53, a lower wall 54, and a rear wall 55. The rear wall 55 intersects with the second direction D2. The right wall 51 and the left wall 52 face the third direction D3. The upper wall 53 and the lower wall 54 face the first direction D1. The material of each of the right wall 51, the left wall 52, the upper wall 53, the lower wall 54, and the rear wall 55 is, for example, a metal.

[0016] The placement portion 70 is a dish-shaped member. The placement portion 70 is accommodated in the cooking chamber 50. An object to be heated can be placed on the placement portion 70. In detail, the placement portion 70 can rotate about a rotation axis along the first direction D1.

[0017] The cooking device 100 further includes a first space R1, a second space R2, a third space R3, a fourth space R4, and a fifth space R5. The first space R1 is disposed between the upper outer wall 13 and the upper wall 53. The second space R2 is disposed between the lower outer wall 14 and the lower wall 54. The third space R3 is disposed between the rear outer wall 15 and the rear wall 55. The fourth space R4 is disposed between the right outer wall 11 and the right wall 51. The fifth space R5 is disposed between the left outer wall 12 and the left wall 52.

[0018] The front wall 60 is a plate-like member having an opening 61 that is substantially rectangular in front view. The front wall 60 faces the rear wall 55. The front wall 60 also faces the rear outer wall 15. The front wall 60 further has a plurality of through-holes 62. The opening 61 communicates between the inside and the outside of the cooking chamber 50.

[0019] The multiple through-hole portions 62 are located above the opening 61. Each of the multiple through-hole portions 62 communicates between the inside and outside of the first space R1. The multiple through-hole portions 62 form eight rows. Each of the eight through-hole portions 62 is formed by three through-holes arranged in a row along the up-down direction.

[0020] Continuing with the above, the door 20 will be described with reference to Fig. 1 to Fig. 4. Fig. 4 is a perspective view showing the door 20. As shown in Figs. 1 to 4, the door 20 has a substantially rectangular plate-shaped member 21 and a rotating shaft portion 22.

[0021] The rotating shaft portion 22 is located near the lower end of the plate-shaped member 21. The plate-shaped member 21 opens and closes the opening 61. Specifically, the plate-shaped member 21 rotates on a rotating shaft along the third direction D3. The plate-shaped member 21 opens the opening 61 in a state perpendicular to the first direction D1. On the other hand, the plate-shaped member 21 closes the opening 61 in a state perpendicular to the second direction D2.

[0022] In detail, the door 20 has a first connecting member 23 and a second connecting member 24. Each of the first connecting member 23 and the second connecting member 24 connects the cooking chamber 50 and the door 20 when the door 20 is located in the closed position.

[0023] The first connection member 23 and the second connection member 24 are attached to the plate-shaped member 21. The first connection member 23 and the second connection member 24 face each other in the left-right direction. The first connection member 23 is attached to the left edge of the rear surface of the plate-shaped member 21. The second connection member 24 is attached to the right edge of the rear surface of the plate-shaped member 21.

[0024] For example, each of the first connecting member 23 and the second connecting member 24 has a hook member. The hook member is a plate-shaped member whose longitudinal direction is the front-rear direction. The hook member has a claw portion and a rotating pin portion. The rotating pin portion is located at one end of the hook member. The rotating pin portion rotates about a rotation axis extending along the third direction D3. Meanwhile, the claw portion has a protrusion that protrudes downward. The claw portion is located at the other end of the hook member. As a result, the claw portion is rotatable around the rotating pin portion.

[0025] Next, the cooking device 100 will be further described with reference to Fig. 5 to Fig. 7. Fig. 5 is a diagram showing a schematic cross section of the cooking device 100. Specifically, Fig. 5 is a cross section showing the cooking device 100 cut along a plane perpendicular to the third direction D3. Fig. 6 is a diagram showing a schematic cross section of the blower section 140 according to this embodiment. Furthermore, Fig. 7 is a perspective view showing the cooking device 100. Specifically, Fig. 7 shows the external appearance of the cooking device 100 as viewed from above diagonally rear left.

[0026] 5 to 7, the cooking device 100 includes a microwave supplying unit 110, a first heater unit 120, a second heater unit 130, and a blower unit 140. Each of the microwave supplying unit 110, the first heater unit 120, the second heater unit 130, and the blower unit 140 heats an object to be heated.

[0027] First, a description will be given of the microwave supply unit 110. The microwave supply unit 110 supplies microwaves to the inside of the cooking chamber 50.

[0028] The microwave supplying unit 110 is disposed on the upper wall 53 of the cooking chamber 50. Specifically, the microwave supplying unit 110 is located above the cooking chamber 50 via the upper wall 53. The microwave supplying unit 110 has a partition member 111 (see FIG. 3), a radiation chamber, a magnetron 113, and a waveguide 114.

[0029] The magnetron 113 is disposed closer to the front wall 60 than the first heater section 120. The magnetron 113 generates microwaves. The waveguide 114 propagates the microwaves generated by the magnetron to the radiation chamber.

[0030] The partition member 111 is disposed between the radiation chamber and the upper wall 53 of the cooking chamber 50. The material of the partition member 111 is non-metallic and includes, for example, ceramics or mica. As a result, the material of the partition member 111 includes ceramics or mica, so that the partition member 111 transmits microwaves. On the other hand, the material of the radiation chamber and the waveguide 114 includes metal.

[0031] Next, the first heater section 120 will be described. The first heater section 120 is disposed on the upper wall 53 of the cooking chamber 50. The first heater section 120 is, for example, a carbon heater. The carbon heater increases the temperature rise time, so that the heated object can be cooked in a short time. Although the halogen heater also increases the temperature rise time, the carbon heater radiates a larger amount of far infrared rays compared to the halogen heater, so that the heated object can be cooked in a shorter time. Specifically, the first heater section 120 has a first heater 121, a first tube 123, a heat reflector 124, a heat shielding plate 122, and a glass plate 125.

[0032] In detail, the first heater 121 has a resistive heating element inside a glass tube, and generates heat by passing electricity through the resistive heating element. In this embodiment, the resistive heating element is carbon.

[0033] The first tube 123 is made of glass. The first tube 123 houses the first heater 121. The first tube 123 extends along the third direction D3.

[0034] The heat reflecting plate 124 covers the upper part of the first tube 123. The heat reflecting plate 124 covers the upper part, front part, and rear part of the first heater 121. The heat reflecting plate 124 reflects heat toward the cooking chamber 50.

[0035] The heat shielding plate 122 covers the upper side of the heat reflecting plate 124. An air layer 126 is provided between the heat reflecting plate 124 and the heat shielding plate 122. The heat shielding plate 122 covers the upper side, front, and rear of the heat reflecting plate 124.

[0036] The glass plate 125 is a substantially rectangular plate-like member. The glass plate 125 is disposed between the lower portion of the first tube 123 and the cooking chamber 50. In other words, the glass plate 125 separates the first tube 123 from the cooking chamber 50. As a result, the glass plate 125 transmits heat rays from the first heater 121 to the cooking chamber 50. On the other hand, the glass plate 125 prevents moisture and salt from moving from the cooking chamber 50 to the first tube 123. Therefore, the devitrification phenomenon of the first tube 123 can be prevented.

[0037] Next, the second heater section 130 will be described. The second heater section 130 is disposed on the lower wall 54 of the cooking chamber 50. The second heater section 130 has a second heater 131 and a second heater case 132. The second heater 131 is, for example, a glass tube heater, and the resistance heating element is a nichrome wire. When energized, the second heater 131 generates heat. The output of the second heater 131 is lower than the output of the first heater 121. The second heater case 132 covers the lower, front, and rear of the second heater 131. The material of the second heater case 132 includes metal. When energized, the second heater 131 generates heat.

[0038] Next, a description will be given of the air blowing section 140. The air blowing section 140 supplies hot air to the inside of the cooking chamber 50. The air blowing section 140 is disposed on the rear wall 55. Specifically, the air blowing section 140 is located behind the cooking chamber 50 with the rear wall 55 interposed therebetween.

[0039] Specifically, the blower 140 has a blower chamber 141, a third heater 142, a centrifugal fan 143, a drive unit 144, a partition member 145, and a heat shield plate 146. The blower chamber 141 is, for example, a box-shaped member made of metal. The centrifugal fan 143 has a plurality of blades.

[0040] The third heater 142 and the centrifugal fan 143 are housed inside the blower chamber 141. The third heater 142 heats the air inside the blower chamber 141 to generate hot air. Specifically, the shape of the third heater 142 is a ring when viewed from the front to the rear. The third heater 142 is disposed along the outer periphery of the centrifugal fan 143.

[0041] The rear wall 55 has an inlet hole portion and an outlet hole portion. In detail, the inlet hole portion is, for example, a collection of a plurality of punch holes. Similarly, the outlet hole portion is, for example, a collection of a plurality of punch holes. The punch holes are, for example, circular. The diameter of each punch hole of the inlet hole portion and the outlet hole portion is, for example, 3.4 mm to prevent microwave leakage.

[0042] The partition member 145 is, for example, a plate-like member made of metal. The shape of the partition member 145 is, for example, rectangular when viewed from the front side to the rear side. The partition member 145 is disposed on substantially the entire surface of the rear wall 55. Specifically, the partition member 145 is located on the outer side of the rear wall 55.

[0043] The heat shield 146 is, for example, a metal plate-like member. The heat shield 146 has, for example, a rectangular ring-shaped plate-like member when viewed from the front side to the rear side. The heat shield 146 is located outside the partition member 145.

[0044] Drive unit 144 is located outside blower chamber 141. Specifically, drive unit 144 is located outside heat shielding plate 146, and a shaft portion of drive unit 144 penetrates partition member 145 and heat shielding plate 146 and is connected to centrifugal fan 143. Drive unit 144 drives centrifugal fan 143. Drive unit 144 includes, for example, a motor.

[0045] The blower 140 draws in hot air from inside the cooking chamber 50 through the suction holes, and blows the hot air into the cooking chamber 50 through the blowing holes. More specifically, the blower 140 draws in hot air from the center of the inside of the cooking chamber 50, and blows the hot air to the periphery of the inside of the cooking chamber 50. As a result, the entire inside of the cooking chamber 50 can be heated by driving the blower 140.

[0046] As shown again in FIGS. 3 and 5 to 8, cooking chamber 50 further has air intake hole portion 81, air exhaust hole portion 82, air intake damper portion 83, and air exhaust damper portion .

[0047] Air intake hole portion 81 communicates between the inside and outside of cooking chamber 50. Specifically, air intake hole portion 81 is disposed in left wall 52. The shape of air intake hole portion 81 is, for example, rectangular. Specifically, air intake hole portion 81 has, for example, a plurality of punch holes. The punch holes are, for example, circular. The diameter of the punch holes of air intake hole portion 81 is, for example, 3.4 mm to prevent microwaves from leaking.

[0048] Air intake damper section 83 opens and closes air intake hole section 81. Air intake damper section 83 is attached to the outside of left wall 52. For example, when air intake damper section 83 opens air intake hole section 81, the inside and outside of cooking chamber 50 are connected to each other. As a result, air is guided to air intake hole section 81. On the other hand, when air intake damper section 83 closes air intake hole section 81, the inside and outside of cooking chamber 50 are not connected to each other. As a result, air is not guided to air intake hole section 81.

[0049] Moreover, exhaust hole portion 82 communicates between the inside and outside of cooking chamber 50. Specifically, exhaust hole portion 82 is disposed in right wall 51. The shape of exhaust hole portion 82 is, for example, rectangular. Specifically, exhaust hole portion 82 has, for example, a plurality of punched holes. The punched holes are, for example, circular. The diameter of the punched holes of exhaust hole portion 82 is, for example, 3.4 mm to prevent microwaves from leaking.

[0050] The exhaust damper section 84 opens and closes the exhaust hole section 82. The exhaust damper section 84 is attached to the outside of the right wall 51. For example, when the exhaust damper section 84 opens the exhaust hole section 82, the inside and outside of the cooking chamber 50 are communicated with each other. On the other hand, when the exhaust damper section 84 closes the exhaust hole section 82, the inside and outside of the cooking chamber 50 are not communicated with each other.

[0051] Next, the air flow will be described in detail. First, the intake damper section 83 opens the intake hole section 81, and the exhaust damper section 84 opens the exhaust hole section 82. As a result, air is guided to the intake hole section 81. The air is blown out into the cooking chamber 50 through the intake hole section 81. The air blown out from the intake hole section 81 into the cooking chamber 50 moves in the opposite direction to the third direction D3. The air is then exhausted out of the cooking chamber 50 from the exhaust hole section 82.

[0052] As shown in Figs. 5 to 7 again, the cooking device 100 further includes a first fan 210, a first airflow direction plate 500, and a first guide section 550. For example, the first fan 210 is a sirocco fan. The first fan 210 is disposed on the upper wall 53 of the cooking chamber 50. The first fan 210 is also disposed between the rear wall 55 of the cooking chamber 50 and the rear outer wall 15 of the housing 10. Specifically, the first fan 210 is disposed in an overlapping region of the first space R1 and the third space R3.

[0053] Specifically, the first fan 210 is located at the same height as the plurality of through-holes 62. The first fan 210 generates an airflow between the upper wall 53 of the cooking chamber 50 and the upper outer wall 13 of the housing 10. The first fan 210 takes in air from outside the cooking device 100 into the first space R1. The first fan 210 also generates an airflow between the rear wall 55 of the cooking chamber 50 and the rear outer wall 15 of the housing 10. The first fan 210 exhausts the air in the first space R1 into the third space R3.

[0054] The first airflow direction plate 500 has a first slanted plate 501 , a second slanted plate 503 , and a horizontal plate 502 .

[0055] The first swash plate 501 guides a part of the airflow into the first guide portion 550 toward the intake hole portion 81, and guides the remaining part of the airflow to the outside of the first guide portion 550. Specifically, the first swash plate 501 is disposed on the heat shield plate 146. The first swash plate 501 stands on the heat shield plate 146. The first swash plate 501 extends from below the first fan 210 toward the left wall 52.

[0056] The second swash plate 503 guides a part of the airflow into the first guiding section 550 toward the first heater section 120, and guides the remaining part of the airflow out of the first guiding section 550. Specifically, the second swash plate 503 is disposed on the heat shield plate 146. The second swash plate 503 stands on the heat shield plate 146. The second swash plate 503 is located above the first swash plate 501. The second swash plate 503 extends from below the first fan 210 toward the left wall 52.

[0057] The first induction section 550 induces the airflow toward the first heater section 120 and the air intake hole section 81. The first induction section 550 induces the airflow from the first fan 210 toward the first heater section 120 and the air intake hole section 81. Specifically, the first induction section 550 is a cylindrical body. The cylindrical body has an intake port and an exhaust port. The cylindrical body is disposed on the left wall 52. The intake port opens toward the opposite direction to the second direction D2. The exhaust port opens toward the first heater section 120 and the air intake hole section 81.

[0058] The horizontal plate 502 is disposed on the left wall 52. The horizontal plate 502 stands on the left wall 52. The horizontal plate 502 extends from the rear wall 55, passing below the intake damper portion 83, toward the front wall 60.

[0059] Here, the air flow generated by driving the first fan 210 will be described. When the first fan 210 is driven, it generates an intake airflow AF. The intake airflow AF flows from the outside of the cooking device 100 through the multiple through-holes 62, circulates through the first space R1 between the microwave supply unit 110 and the upper outer wall 13 in the opposite direction to the second direction D2, and heads toward the first heater unit 120. At this time, the intake airflow AF cools the magnetron 113 of the microwave supply unit 110. The intake airflow AF that has cooled the magnetron 113 flows through the first space R1 between the first heater unit 120 and the upper outer wall 13 in the opposite direction to the second direction D2, and heads toward the first fan 210. At this time, the intake airflow AF cools the heat shielding plate 122 of the first heater unit 120. In other words, the first fan 210 generates an air current that flows through the magnetron 113 and the first heater section 120 in that order.

[0060] Moreover, when the first fan 210 is driven, it generates the blown airflow BF1, the blown airflow BF2, and the blown airflow BF3. The blown airflow BF1 is blown out in a downward direction. The blown airflow BF1 flows in a downward direction through the third space R3 between the blower unit 140 and the rear outer wall 15. At this time, the blown airflow BF1 cools the drive unit 144 of the blower unit 140.

[0061] The blown airflow BF1 that has reached the lower outer wall 14 flows in the second direction D2 through the second space R2 between the lower outer wall 14 and the second heater section 130. At this time, the blown airflow BF1 cools the second heater case 132 of the second heater section 130. In other words, the first fan 210 generates an airflow that flows through the magnetron 113, the first heater section 120, and the second heater section 130 in this order. The blown airflow BF1 that has cooled the second heater section 130 is discharged to the outside of the cooking appliance 100.

[0062] The discharge airflow BF2 also reaches the first swash plate 501. The discharge airflow BF2 that has reached the first swash plate 501 is guided along the first swash plate 501 to the left wall 52. A part of the discharge airflow BF2 guided to the left wall 52 is led into the first guide portion 550 toward the air intake hole 81. A remaining part of the discharge airflow BF2 is guided out of the first guide portion 550 and flows along the horizontal plate 502 in the second direction D2.

[0063] Further, the discharge airflow BF3 reaches the second swash plate 503. The discharge airflow BF3 that reaches the second swash plate 503 is guided along the second swash plate 503 to the left wall 52. A part of the discharge airflow BF3 guided to the left wall 52 flows through the first guide section 550. The discharge airflow BF3 that has flowed through the first guide section 550 flows through the first heater section 120 in the opposite direction to the third direction D3. At this time, the discharge airflow BF3 cools the first heater section 120. The discharge airflow BF3 that has cooled the first heater section 120 is guided to the right wall 51. The remaining part of the discharge airflow BF2 guided to the left wall 52 flows along the horizontal plate 502 in the second direction D2.

[0064] As described above with reference to Figures 1 to 5, the first fan 210 generates an airflow that flows through the magnetron 113 and the first heater section 120 in that order, thereby efficiently cooling the magnetron 113 arranged on the upper wall 53 of the cooking chamber 50.

[0065] In addition, the first fan 210 generates an airflow between the upper wall 53 of the cooking chamber 50 and the upper outer wall 13 of the housing 10, thereby enabling the magnetron 113 arranged on the upper wall 53 of the cooking chamber 50 to be cooled more efficiently.

[0066] And, since first fan 210 is disposed between rear wall 55 of cooking chamber 50 and rear outer wall 15 of housing 10, it is possible to suppress the transmission of the driving sound of first fan 210 to the user. Furthermore, by disposing magnetron 113 and heat shielding plate 122 between first fan 210 and through-hole portion 62, it is possible to shield a part of the driving sound of first fan 210, and it is possible to further suppress the transmission of the driving sound of first fan 210 to the user.

[0067] Furthermore, since the first fan 210 generates an air current that flows through the magnetron 113, the first heater section 120, and the second heater section 130 in that order, the magnetron 113 arranged on the upper wall 53 of the cooking chamber 50 can be efficiently cooled.

[0068] Next, the second fan 220 will be described with reference to Fig. 7 to Fig. 9. Fig. 8 is a perspective view showing the cooking device 100. In detail, Fig. 8 shows the external appearance of the cooking device 100 as seen from above diagonally rear right. Fig. 9 is a block diagram showing the configuration of the cooking device 100. As shown in Figs. 6 to 9, the cooking device 100 further includes the second fan 220, a second airflow direction plate 600, a control board 300, a high-voltage capacitor 330, and a high-voltage transformer 340.

[0069] The control board 300 includes a storage unit 310 and a control unit 320. The storage unit 310 is configured with a RAM (Random Access Memory) and a ROM (Read Only Memory). The storage unit 310 stores a control program for controlling the operation of each unit of the cooking appliance 100.

[0070] The control unit 320 is a hardware circuit including a processor such as a CPU (Central Processing Unit). The control unit 320 executes a control program stored in the storage unit 310.

[0071] The high-voltage capacitor 330 is disposed between the first fan 210 and the second fan 220 and the through-hole portion 62 .

[0072] The high-voltage transformer 340 is disposed between the second fan 220 and the through-hole portion 62 .

[0073] The second fan 220 is, for example, a sirocco fan. The first fan 210 and the second fan 220 are arranged side by side in the left-right direction. The second fan 220 is arranged on the upper wall 53 of the cooking chamber 50. The second fan 220 is also arranged between the rear wall 55 of the cooking chamber 50 and the rear outer wall 15 of the housing 10. Specifically, the second fan 220 is arranged in the area where the first space R1 and the third space R3 overlap.

[0074] In detail, the second fan 220 is located at the same height as the plurality of through-hole portions 62. The second fan 220 generates an airflow between the upper wall 53 of the cooking chamber 50 and the upper outer wall 13 of the housing 10. The second fan 220 takes in air outside the cooking device 100 into the first space R1. The second fan 220 also generates an airflow between the rear wall 55 of the cooking chamber 50 and the rear outer wall 15 of the housing 10. The second fan 220 exhausts the air in the first space R1 into the third space R3.

[0075] The second airflow direction plate 600 guides the airflow to the exhaust damper portion 84. Specifically, the second airflow direction plate 600 has a slanted plate 601 and a horizontal plate 602.

[0076] The swash plate 601 is disposed on the rear wall 55. The swash plate 601 stands on the heat shield 146. The swash plate 601 extends from below the second fan 220 toward the right wall 51.

[0077] The horizontal plate 602 is disposed on the right wall 51. The horizontal plate 602 stands on the right wall 51. The horizontal plate 602 extends from the rear wall 55, passing below the exhaust damper portion 84, toward the front wall 60.

[0078] Here, the air flow generated by driving the second fan 220 will be described. When the second fan 220 is driven, it generates an intake airflow CF. The intake airflow CF flows from the outside of the cooking device 100 through the multiple through-holes 62, flows through the first space R1 between the control board 300 and the upper outer wall 13 in the opposite direction to the second direction D2, and heads toward the first heater unit 120. At this time, the intake airflow CF cools the control board 300. The intake airflow CF that has cooled the control board 300 flows through the first space R1 between the first heater unit 120 and the upper outer wall 13 in the opposite direction to the second direction D2, and heads toward the second fan 220. At this time, the intake airflow CF cools the heat shield plate 122 of the first heater unit 120. In other words, the second fan 220 generates an airflow that flows through the control board 300 and the first heater unit 120 in this order.

[0079] Moreover, when the second fan 220 is driven, it generates the blown airflow DF1 and the blown airflow DF2. The blown airflow DF1 is blown out in a downward direction. The blown airflow DF1 flows downward through the third space R3 between the blower unit 140 and the rear outer wall 15. At this time, the blown airflow DF1 cools the drive unit 144 of the blower unit 140.

[0080] The blown airflow DF1 that has reached the lower outer wall 14 flows in the second direction D2 through the second space R2 between the lower outer wall 14 and the second heater section 130. At this time, the blown airflow DF1 cools the second heater case 132 of the second heater section 130. In other words, the second fan 220 generates an airflow that flows through the control board 300, the first heater section 120, and the second heater section 130 in this order. The blown airflow DF1 that has cooled the second heater section 130 is discharged to the outside of the cooking appliance 100.

[0081] The discharge airflow DF2 also reaches the slanting plate 601. The discharge airflow DF2 that has reached the slanting plate 601 is guided along the slanting plate 601 to the right wall 51. The discharge airflow DF2 guided to the right wall 51 flows in the second direction D2 along the horizontal plate 602. At this time, the discharge airflow DF2 cools the exhaust damper portion 84. The discharge airflow DF2 that has cooled the exhaust damper portion 84 is discharged to the outside of the cooking appliance 100.

[0082] 7 to 9, by arranging magnetron 113, high-voltage capacitor 330, and control board 300 between first fan 210 and through-hole portion 62, it is possible to block part of the driving sound of first fan 210, and further prevent the driving sound of first fan 210 from being transmitted to the user. Also, by arranging high-voltage transformer 340, high-voltage capacitor 330, and control board 300 between second fan 220 and through-hole portion 62, it is possible to block part of the driving sound of second fan 220, and further prevent the driving sound of second fan 220 from being transmitted to the user.

[0083] As shown in FIGS. 7 and 8 again, the cooking device 100 further includes a front duct member 234 and a rear duct member 230.

[0084] The front duct member 234 extends from the front wall 60 toward the magnetron 113. Specifically, the front duct member 234 is a groove-like member having a generally U-shaped cross section and a longitudinal direction in the second direction D2. The front duct member 234 is disposed in the first space R1. The front duct member 234 faces the upper wall 53.

[0085] In detail, the front duct member 234 has an inlet 235 and an outlet 236. The inlet 235 opens toward the second direction D2. The outlet 236 opens toward the opposite direction to the second direction D2. The size of the inlet 235 is smaller than the size of the outlet 236. The outlet 236 is located in front of the magnetron 113. The outlet 236 is close to the magnetron 113.

[0086] The rear duct member 230 extends from the magnetron 113 toward the first fan 210 .

[0087] Specifically, the rear duct member 230 is a groove-like member having a generally U-shaped cross section and a longitudinal direction in the second direction D2. The rear duct member 230 is disposed in the first space R1. The rear duct member 230 faces the upper wall 53.

[0088] In detail, the rear duct member 230 has an inlet 231 and an outlet 232. The inlet 231 opens toward the second direction D2. The outlet 232 opens toward the opposite direction to the second direction D2. The size of the inlet 231 is smaller than the size of the outlet 232. The outlet 232 is located in front of the first fan 210. The outlet 232 is close to the first fan 210.

[0089] Here, the air flow generated by driving the first fan 210 will be described. When the first fan 210 is driven, it generates an intake airflow AF. The intake airflow AF flows from the outside of the cooking device 100 through the multiple through-holes 62, flows through the front duct member 234 in the opposite direction to the second direction D2, and heads toward the rear duct member 230. At this time, the intake airflow AF cools the magnetron 113 of the microwave supply unit 110. The intake airflow AF that has cooled the magnetron 113 flows through the rear duct member 230 in the opposite direction to the second direction D2, and heads toward the first fan 210. At this time, the intake airflow AF cools the heat shield plate 122. In other words, the first fan 210 generates an airflow that flows through the magnetron 113 and the first heater unit 120 in this order.

[0090] As described above with reference to Fig. 7 and Fig. 8, the cooking device 100 further includes the front duct member 234 and the rear duct member 230, and therefore can more efficiently cool the magnetron 113 disposed on the upper wall 53 of the cooking chamber 50. Furthermore, by disposing the magnetron 113, the high-voltage capacitor 330, the front duct member 234, and the rear duct member 230 between the first fan 210 and the through-hole portion 62, it is possible to block out part of the driving sound of the first fan 210, and further suppress the driving sound of the first fan 210 from being transmitted to the user.

[0091] Referring again to FIG. 9, the configuration of the cooking device 100 will be described in detail. In this embodiment, the cooking device 100 has a "microwave heating mode", a "hot air circulation heating mode", and a "grill heating mode" as cooking modes. The "microwave heating mode" is a mode in which an object to be heated is cooked by radiating microwaves into the cooking chamber 50. The "grill heating mode" is a mode in which an object to be heated is cooked by radiating heat generated by the first heater section 120 and the second heater section 130 to the object to be heated. The "hot air circulation heating mode" is a mode in which an object to be heated is cooked by circulating hot air throughout the cooking chamber 50 to uniform the temperature in the cooking chamber 50.

[0092] The control unit 320 executes a control program stored in the memory unit 310 to control the operation of the microwave supply unit 110, the blower unit 140, the first heater unit 120, the second heater unit 130, the first fan 210, and the second fan 220.

[0093] In detail, the control unit 320 controls the operation panel 30, the magnetron 113, the first heater 121, the second heater 131, the third heater 142, the drive unit 144, the first fan 210, the second fan 220, the intake damper unit 83, and the exhaust damper unit 84. For example, when the "microwave heating mode" is selected, the control unit 320 drives the magnetron 113, the first fan 210, the second fan 220, the intake damper unit 83, and the exhaust damper unit 84. When the "grill heating mode" is selected, the control unit 320 drives the first heater 121, the second heater 131, the first fan 210, and the second fan 220. Furthermore, when the “hot air circulation heating mode” is selected, the control unit 320 drives the drive unit 144, the first fan 210, and the second fan 220, and drives at least one of the first heater 121, the second heater 131, and the third heater 142.

[0094] The cooking device 100 further has a "high-speed cooking mode." For example, when the "high-speed cooking mode" is selected, the control unit 320 drives the magnetron 113, the first fan 210, the second fan 220, the first heater 121, the second heater 131, the drive unit 144, and the third heater 142.

[0095] Although the heating cooking modes have been described above, the heating cooking modes are not limited to these, and the magnetron 113, the first fan 210, the second fan 220, the first heater 121, the second heater 131, the drive unit 144 and the third heater 142 can be freely combined.

[0096] As is clear from the above, the cooking device 100 is capable of heating an object to be heated by microwave heating or infrared heating.

[0097] In microwave heating, microwave supply unit 110 generates microwaves directed from the outside to the inside of cooking chamber 50. Magnetron 113 is an example of the "microwave generation unit" of the present invention. The microwaves heat the object to be heated.

[0098] On the other hand, in infrared heating, the first heater section 120 radiates infrared rays that travel from the outside to the inside of the cooking chamber 50. The first heater section 120 is an example of the "infrared heater" of the present invention. The object to be heated is heated by the infrared rays.

[0099] In this embodiment, the first heater 121 is a carbon heater and is therefore susceptible to the effects of microwaves from the magnetron 113. Therefore, the cooking device 100 is provided with a shielding / transmitting section 150 as shown in Fig. 6. The shielding / transmitting section 150 can transmit infrared rays while blocking microwaves, so that heating with microwaves and infrared rays can be performed simultaneously.

[0100] Hereinafter, the shielding / transmitting portion 150 will be described with reference to Figs. 10 to 12. Fig. 10 is an enlarged view of the cross section of the first heater 121 and the shielding / transmitting portion 150 shown in Fig. 5. Fig. 11 is a perspective view of the shielding / transmitting portion 150 shown in Fig. 10 as viewed diagonally from above the front right. Fig. 12 is a view of the shielding / transmitting portion 150 shown in Fig. 10 as viewed from below. As shown in Figs. 10 to 12, the shielding / transmitting portion 150 has at least a first plate-shaped member 151 and a second plate-shaped member 152. That is, the cooking device 100 includes the first plate-shaped member 151 and the second plate-shaped member 152.

[0101] The first plate-shaped member 151 and the second plate-shaped member 152 are, for example, punched metal, and are produced by performing a hole-making process (punching process) on a metal plate. Therefore, the first plate-shaped member 151 and the second plate-shaped member 152 have a plurality of through holes 151A and a plurality of through holes 152A. For convenience of illustration, in Figs. 10 to 12, the reference symbols "151A" and "152A" are given to two through holes in each of the first plate-shaped member 151 and the second plate-shaped member 152.

[0102] Each of the first plate-shaped member 151 and the second plate-shaped member 152 is located between the first heater section 120 and the cooking chamber 50, and extends in the second direction D2 and the third direction D3 at each position. The first plate-shaped member 151 extends substantially parallel to the glass plate 125 at a position spaced downward from the glass plate 125. The second plate-shaped member 152 is located below the first heater 121 and the glass plate 125, and above the first plate-shaped member 151. According to this embodiment, it is possible to provide a cooking device 100 having shielding and transmission properties. In detail, the first plate-shaped member 151 and the second plate-shaped member 152 are located at a distance G11 from each other. Therefore, during microwave heating, leakage of microwaves from the inside to the outside of the cooking chamber 50 is suppressed. In addition, since the first plate-shaped member 151 and the second plate-shaped member 152 have a plurality of through holes 151A, 152A, during infrared heating, infrared rays from the first heater section 120 are radiated to the cooking chamber 50. That is, according to this embodiment, it is possible to provide a cooking device 100 having both shielding and transmitting properties.

[0103] The second plate-shaped member 152 is preferably positioned along the glass plate 125. The second plate-shaped member 152 may be in direct contact with the glass plate 125 or may be separated from the glass plate 125. Since the glass plate 125 is provided so as to close the through hole 152A of the second plate-shaped member 152, it is possible to prevent moisture and salt from moving from the cooking chamber 50 to the first tube 123. Therefore, it is possible to prevent the devitrification phenomenon of the first tube 123. Specifically, the glass plate 125 is fixed so as to be sandwiched between the glass plate pressing portion formed on the heat reflecting plate 124 and the second plate-shaped member 152. According to this embodiment, since the glass plate 125 is fixed without using an adhesive, it is not necessary to consider the heat resistance temperature of the adhesive, and the first heater 121 can be made to have an even higher temperature. As a result, it is possible to shorten the time required for cooking the heated object.

[0104] The through hole 151A of the first plate-like member 151 overlaps with the through hole 152A of the second plate-like member 152. In detail, in this embodiment, the through hole 151A overlaps with the through hole 152A in the first direction D1. According to this embodiment, it is easier to radiate infrared rays from the first heater section 120 to the cooking chamber 50 than when the through holes 151A and 152A do not overlap. Note that the direction of one of the through holes 151A and 152A relative to the other is not limited to the first direction D1, but depends on the direction of the cooking chamber 50 of the first heater section 120. That is, the through hole 151A may overlap with the through hole 152A in a direction other than the first direction D1.

[0105] It is preferable that central axis 151B of through hole 151A is aligned on the same line as central axis 152B of through hole 152A. This configuration makes it easier to radiate infrared rays from first heater section 120 to cooking chamber 50 than when central axes 151B and 152B are not aligned on the same line.

[0106] In order to suppress uneven heating during infrared heating and to improve heating efficiency, it is preferable that the pitch P01 of the through holes 151A and the pitch P02 of the through holes 152A are the same. The pitch P01 of the through holes 151A is the center-to-center distance between two adjacent through holes 151A. The pitch P02 of the through holes 152A is the center-to-center distance between two adjacent through holes 152A.

[0107] The diameter φ2A of the through hole 152A is smaller than the diameter φ1A of the through hole 151A. This configuration suppresses the leakage of microwaves from the through hole 152A, compared to when the diameter φ2A is not smaller than the diameter φ1A. The diameters φ1A and φ2A are far shorter than the wavelength of microwaves (about 12 cm). Normally, the diameters φ1A and φ2A are preferably less than 4 mm, but according to this embodiment, the leakage of microwaves can be suppressed well even if the diameters φ1A and φ2A are slightly larger. For example, the diameter φ1A can be 6 mm and the diameter φ2A can be 5.2 mm. As a result, not only can a carbon heater that is easily affected by microwaves be used, but also infrared rays radiated from the carbon heater can be more easily transmitted.

[0108] Next, a modified example of the first heater section 120 will be described with reference to FIG.

[0109] 10, the first heater section 120 preferably has a metal film 127 on the outer circumferential surface of the first tube 123. The metal film 127 is formed, for example, by evaporating a specific metal and depositing it on the surface of the first tube 123. A typical example of the specific metal is gold (Au).

[0110] The inventors of the present application obtained wavelength characteristics of a carbon heater having a metal film 127 and a carbon heater without a metal film 127. Fig. 13 is a graph showing the respective wavelength characteristic curves. In Fig. 13, the horizontal axis indicates wavelength, and the vertical axis indicates relative radiant energy. The relative radiant energy is obtained by dividing the radiant energy for each wavelength by the maximum radiant energy.

[0111] 13 further shows curves C01 and C02. Curve C01 is a wavelength characteristic curve of relative radiant energy E01 of a carbon heater having a metal film 127. Curve C02 is a wavelength characteristic curve of relative radiant energy E02 of a carbon heater without a metal film 127.

[0112] 13, in most of the wavelength range from about 4.5 μm to about 10 μm (the wavelength range surrounded by the dashed line), the relative radiant energy E01 exceeds the relative radiant energy E02. In detail, the relative radiant energy E01 exceeds the relative radiant energy E02 within a range from about 1.2 times to about 2.0 times. Therefore, the first heater section 120 has the metal film 127, thereby improving the far-infrared effect. In other words, the surface of the heated object can be heated in a short time.

[0113] The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the scope of the present invention. The drawings are mainly schematic illustrations of each component for ease of understanding, and the thickness, length, number, etc. of each component shown in the drawings are different from the actual ones due to the convenience of drawing. In addition, the materials, shapes, dimensions, etc. of each component shown in the above embodiments are merely examples, and are not particularly limited, and various modifications are possible within a scope that does not substantially deviate from the effects of the present invention.

[0114] (1) In the present embodiment, the shielding / transmitting section 150 is disposed between the first heater section 120 and the cooking chamber 50. However, this is not limiting, and the shielding / transmitting section 150 may also be disposed between at least one of the second heater section 130 and the third heater 142 and the cooking chamber 50. In this case, at least one of the second heater section 130 and the third heater 142 is another example of the "first heater section" of the present invention. [Industrial Applicability]

[0115] INDUSTRIAL APPLICABILITY The present invention provides a cooking device and has industrial applicability. [Explanation of symbols]

[0116] 100 Cooker 110 Microwave supply unit 113 Magnetron 120 First heater section 150 Shielding / transmission part 151 First plate-shaped member 152 Second plate-shaped member 210 1st Fan AF Airflow

Claims

1. A heating chamber; an infrared heater that radiates infrared rays from the outside of the heating chamber toward the inside of the heating chamber; A microwave generating unit that radiates microwaves from the outside to the inside of the heating chamber; a first plate-like member located between the infrared heater and the heating chamber and having a plurality of through holes; a second plate member having a plurality of through holes, the second plate member being positioned between the first plate member and the infrared heater and spaced apart from the first plate member; A heating cooker comprising:

2. The cooking device according to claim 1 , wherein the through hole of the first plate-like member overlaps with the through hole of the second plate-like member.

3. 3. The cooking device according to claim 1, wherein a central axis of the through hole of the first plate-like member is aligned on the same line as a central axis of the through hole of the second plate-like member.

4. The cooking device according to claim 1 or 2, wherein a diameter of the through hole of the second plate-like member is smaller than a diameter of the through hole of the first plate-like member.

5. The cooking device according to claim 1 or 2, wherein the infrared heater is a carbon heater.

Images