Heating cooker

Abstract

Provided is a heating cooker. A heating cooker according to the present disclosure includes a main body, a heating chamber, a magnetron, a control board, a blower fan, and an exhaust duct. The heating chamber is provided inside the main body and can accommodate an object to be heated. The magnetron supplies microwaves to be supplied to the heating chamber. The control substrate controls driving of the magnetron. The air supply fan cools the magnetron and the control substrate. The exhaust duct is provided at the rear of the heating chamber and has an exhaust port for discharging the exhaust air from the heating chamber and the cooling air generated by the blower fan. The interior of the exhaust duct is provided with a metal heat dissipation part.

Description

Technical Field

[0001] This invention relates to heating cookers, and more particularly to the exhaust structure of heating cookers. Background Technology

[0002] Previously, there was a type of heating cooker that discharged cooling air, which cooled components such as the control board, from an exhaust pipe located at the rear of the main body (for example, see Japanese Patent Application Publication No. 2009-8297). Summary of the Invention

[0003] In the aforementioned prior art, there is room for improvement in the structure of the exhaust pipe. The purpose of this disclosure is to provide a heating cooker capable of reducing the temperature of exhaust gas in the exhaust pipe before it is discharged from the exhaust pipe.

[0004] The heating cooker disclosed herein has a main body, a heating chamber, a magnetron, a control board, a blower fan, and an exhaust pipe.

[0005] The heating chamber is located inside the main body and can accommodate the object to be heated. A magnetron generates microwaves to supply the heating chamber. A control board controls the magnetron's operation. A fan cools the magnetron and the control board.

[0006] The exhaust duct is located at the rear of the heating chamber and has an outlet for discharging exhaust air from the heating chamber and cooling air generated by the blower fan. The exhaust duct has a metal heat dissipation section disposed inside the exhaust duct.

[0007] The heating cooker disclosed herein is capable of reducing the temperature of the exhaust gas from the main body in the exhaust pipe before the exhaust gas from the heating chamber is discharged outside the device. Attached Figure Description

[0008] Figure 1 This is a front perspective view showing the appearance of a heating cooker according to an embodiment of the present disclosure.

[0009] Figure 2 This is a perspective view of the heated cooker with the door open according to the embodiment.

[0010] Figure 3 This is a rear perspective view showing the appearance of the heating cooker according to the embodiment.

[0011] Figure 4 This is a rear perspective view of the heating cooker in the embodiment with the exhaust pipe removed.

[0012] Figure 5 This is a front perspective view showing the heating cooker in the embodiment with its outer cover removed.

[0013] Figure 6 This is a partial cross-sectional view of the heating cooker as seen from the rear in the embodiment.

[0014] Figure 7 This is a partial longitudinal sectional view of the heating cooker as seen from the right side of the embodiment.

[0015] Figure 8A This is a perspective view of the exhaust pipe of the heating cooker according to the embodiment.

[0016] Figure 8B This is a perspective view of the internal exhaust pipe of the heating cooker according to the embodiment.

[0017] Figure 9 This is a circuit diagram related to the control of the heating source in the heating cooker of the embodiment. Detailed Implementation

[0018] The heating cooker of the first aspect disclosed herein has a main body, a heating chamber, a magnetron, a control board, a blower fan, and an exhaust duct.

[0019] The heating chamber is located inside the main body and can accommodate the object to be heated. A magnetron generates microwaves to supply the heating chamber. A control board controls the magnetron's operation. A fan cools the magnetron and the control board.

[0020] The exhaust duct is located at the rear of the heating chamber and has an outlet for discharging exhaust gas from the heating chamber and cooling air generated by the blower fan. The exhaust duct has a metal heat dissipation section disposed inside the exhaust duct.

[0021] According to this method, the temperature of the exhaust from the main body can be reduced in the exhaust pipe before the exhaust from the heating chamber is discharged outside the equipment.

[0022] In the second aspect of the heating cooker disclosed herein, based on the first aspect, the main body has: a back side disposed behind the heating chamber; and a first exhaust port disposed on the back side for discharging exhaust gas from the heating chamber. A heat dissipation section has a through hole opposite to the first exhaust port. According to this approach, the temperature of the exhaust gas from the main body can be reduced in the exhaust pipe before it is discharged outside the appliance from the exhaust pipe.

[0023] In the third-party heating cooker disclosed herein, based on the second method, the main body further has a second exhaust port located on the back of the main body for discharging cooling air. The second exhaust port is located inside the exhaust duct. According to this method, the temperature of the exhaust from the main body can be reduced in the exhaust duct before it is discharged from the heating chamber to the outside of the device.

[0024] In the heating cooker of the fourth aspect of this disclosure, based on the second aspect, the first exhaust port includes a plurality of holes disposed on an inclined portion at the rear of the main body. The heat dissipation portion has a protrusion disposed substantially parallel to the inclined portion and protruding forward from the heat dissipation portion. The through-hole includes a plurality of holes disposed on the protrusion. According to this aspect, the temperature of the exhaust from the main body can be reduced in the exhaust pipe before it is discharged outside the appliance from the exhaust pipe.

[0025] In the fifth aspect of the heating cooker disclosed herein, based on the first or second aspect, the heat dissipation section is made of aluminum. According to this aspect, the temperature of the exhaust gas from the main body can be reduced in the exhaust pipe before it is discharged outside the device from the exhaust pipe.

[0026] (Implementation Method)

[0027] [Structure of the main body and heating source of the heating cooker]

[0028] Hereinafter, the heating cooker 100 according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. Figure 1 This is a perspective view showing the appearance of the heating cooker 100. Figure 2 This is a perspective view of the heating cooker 100 with door 2 open.

[0029] In this embodiment, as shown in the accompanying drawings, the door 2 side of the main body 1 of the heating cooker 100 is defined as the front of the heating cooker 100, and the opposite side is defined as the rear. The left and right sides when viewing the heating cooker 100 from the front are defined as the left and right sides of the heating cooker 100, respectively.

[0030] like Figure 1 and Figure 2 As shown, the heating cooker 100 includes a heating chamber 4 disposed inside the main body 1. The main body of the heating cooker 100 has a door 2 that can be opened and closed to cover the front surface opening 4b of the heating chamber 4.

[0031] In this embodiment, door 2 is a so-called longitudinally opening door with a handle 3 provided on its upper part. The interior of heating chamber 4 is substantially sealed due to the closure of door 2, and the food being heated is heated and cooked inside heating chamber 4.

[0032] like Figure 1 As shown, a setting section 5 is provided on the front surface of the heating cooker 100, i.e., the front surface of the door 2. The setting section 5 has a rotary knob and buttons for setting various cooking conditions such as temperature and time. Furthermore, the setting section 5 has a display section that displays the set cooking conditions and the status of the heated object during cooking.

[0033] Figure 5 This is a perspective view of the heating cooker 100 with the outer cover of the main body 1 removed. Figure 6 This is a partial cross-sectional view of the heating cooker 100 as viewed from the rear. The heating cooker 100, as a heat source, includes... Figure 5 The upper heater 8 shown (in this embodiment, it is a planar heater unit) Figure 6 The lower heater 21 shown is a (e.g., a sheath heater) and a microwave heating unit that uses microwaves to heat the object being heated.

[0034] Additionally, the heating cooker 100 may have one or both of the following: a steam heating unit (not shown) that uses steam to heat the object being heated, and a hot air circulation unit (not shown) that uses hot air circulating in the heating chamber 4 to heat the object being heated.

[0035] The lower heater 21 is a sheathed heater in which a coil-shaped nickel-chromium alloy wire serving as the heating element passes through a metal tube, and is located below the bottom wall 4a of the heating chamber 4. The lower heater can be a tubular lamp heater that emits infrared rays.

[0036] like Figure 6 As shown, a mechanical chamber 29 is provided in the space between the bottom wall 4a of the heating chamber 4 and the bottom plate 10 of the main body 1. The mechanical chamber 29 is equipped with a control board 30, a magnetron 31, an inverter board 32, a blower fan 33, etc.

[0037] The magnetron 31 is a key component of the microwave heating unit. The inverter board 32 includes an inverter circuit that drives the magnetron 31. In addition to the inverter board 32, the control board 30 also includes a control unit for controlling the upper heater, lower heater, etc. A fan 33 generates cooling air to cool the machine compartment 29. The machine compartment 29 also functions as an insulated space.

[0038] Furthermore, the microwave heating unit has a radiating antenna (not shown) below the bottom wall 4a of the heating chamber 4 for radiating microwaves into the heating chamber 4.

[0039] The steam heating unit has a water tank and a boiler that heats the water from the water tank to generate steam, which is then injected into the heating chamber 4. The hot air circulation unit has a rear heater and a circulating fan located behind the heating chamber 4, which draws air from the heating chamber 4 and supplies hot air generated by heating the air to the heating chamber 4.

[0040] As described above, the heating cooker 100 has multiple heating sources. By selecting a desired heating source or desired cooking content, the user selects at least one suitable heating source from the multiple heating sources. The user places the object to be heated into the heating chamber 4 and closes the door 2, sets the heating source, cooking content, etc. in the setting unit 5, and presses the start button to begin the cooking operation.

[0041] like Figure 2 As shown, the heating cooker 100 houses a heating plate 6, which is used to heat a placed object, inside a heating chamber 4. The heating plate 6 is disposed inside the heating chamber 4, and its left and right edges are supported on either of a multi-layered support frame respectively provided on the left and right side walls of the heating chamber 4. The heating plate 6 has a heating element (not shown) disposed on its mounting surface. The heating element is, for example, made of ferrite, and heats up by absorbing microwaves.

[0042] Furthermore, the heating element can be any structure that absorbs microwaves to generate heat, and is not limited to ferrite. The heating element can be coated on the back of the heating plate 6. The main material of the heating plate 6 can be any material with excellent thermal conductivity, and can be metal or ceramic. The heating plate 6 can be suspended from the top wall of the heating chamber 4 and disposed inside the heating chamber 4. The heating plate 6 can also have four feet located at the four corners of the heating plate 6 and protruding downwards, and be placed on the bottom wall 4a of the heating chamber 4.

[0043] A radiating antenna (not shown) is positioned approximately below the center of the bottom wall 4a of the heating chamber 4. The radiating antenna is directional in the direction of microwave radiation. The microwave heating unit has a rotating mechanism (not shown) that enables the radiating antenna to rotate so that its radiating aperture faces a desired direction on the horizontal plane.

[0044] In addition, the radiating antenna has a radiating port on its upper part for radiating circularly polarized microwaves upwards. The object to be heated, placed on the bottom wall 4a of the heating chamber 4, is uniformly heated by microwaves radiated from the radiating antenna and supplied to the heating chamber 4 via the bottom wall 4a.

[0045] The bottom wall 4a of the heating chamber 4 is made of a material (e.g., ceramic) that allows microwaves from the radiating antenna to pass through. The side walls, back wall 4c, and top wall of the heating chamber 4 are made of aluminized steel sheets made of steel or stainless steel (SUS).

[0046] Each wall surface of the heating chamber 4 may have a non-adhesive coating layer, such as fluororesin or silicone resin. This coating layer prevents the adhesion of grease, cooking residue, and other contaminants that splatter during cooking. Furthermore, even if contaminants do adhere, they can be easily wiped away. Additionally, each wall surface of the heating chamber 4 may have a covering layer that has a self-cleaning function, utilizing the heat during cooking to break down and automatically clean away any grease that splatters during cooking.

[0047] To enable the coating layer to have self-cleaning properties, catalysts such as manganese oxide-based catalysts that promote oxidative decomposition can be incorporated into the coating layer. Platinum, which exhibits significant effects on oxidative decomposition at low temperatures, or palladium, which has high activity in the medium to high temperature range, can be added to the coating layer. Additionally, cerium, which has adsorption properties, can be added to the coating layer.

[0048] In this embodiment, the object to be heated, placed inside the heating plate 6 housed within the heating chamber 4, is heated by receiving microwaves through the heating element of the heating plate 6. Furthermore, the upper heater 8 heats the object placed on the heating plate 6 from above. And, the lower heater 21 heats the object placed on the bottom wall 4a from below.

[0049] [Structure of the exhaust path]

[0050] Figure 3 This is a rear perspective view showing the appearance of the heating cooker 100. (Example) Figure 3 As shown, a back plate 22 is disposed on the back of the main body 1. The back plate 22 has a shape that protrudes rearward for most of its portion except for its periphery. Above the back plate 22, a resin exhaust pipe 23 is mounted in close contact with the back plate 22.

[0051] An exhaust port 23a is provided at the upper part of the exhaust duct 23. Exhaust from the main body 1 is discharged from the exhaust port 23a. This exhaust includes exhaust from the heating chamber 4 and cooling air after cooling the mechanical chamber 29.

[0052] A rear protrusion 24 is provided at the lower part of the back plate 22. The rear protrusion 24 has a shape that protrudes further rearward from the back plate 22. An exhaust port 24a, different from the exhaust port 23a, is provided at the upper edge of the rear protrusion 24. Cooling air after cooling the machine chamber 29 is discharged from the exhaust port 24a.

[0053] According to this structure, when the heating cooker 100 is installed in close contact with the wall of the room, the back panel 22 can form a gap between the back panel 22 and the wall of the room through the back protrusion 2. Therefore, exhaust from the exhaust port 24a can rise along this gap.

[0054] Figure 4This is a rear perspective view of the heating cooker 100 with the exhaust pipe 23 removed. (See image below.) Figure 4 As shown, the back plate 22 has an inclined portion 22a disposed on the upper part of the back plate 22. The inclined portion 22a has a surface parallel to a plane having a normal line pointing obliquely upward toward the rear of the main body 1. A first exhaust port 25 is provided in the inclined portion 22a. The first exhaust port 25 has a plurality of through holes for allowing exhaust from the heating chamber 4 to pass through.

[0055] In this embodiment, the first vent 25 has five through holes on the left side (three above and two below) and five through holes on the right side (three above and two below). However, the number of through holes included in the first vent 25 is not limited to this embodiment.

[0056] Furthermore, a second vent 26 is provided to the left and right of the first vent 25 on the inclined portion 22a of the back plate 22. Each second vent 26 has an elliptical through hole. The number and shape of the second vent 26 are not limited to this embodiment.

[0057] By fixing the exhaust pipe 23 to the back plate 22 with screws or the like, the first exhaust port 25 and the second exhaust port 26 are normally covered by the exhaust pipe 23. Therefore, exhaust from the heating chamber 4 is discharged from the first exhaust port 25 to the exhaust pipe 23 (see reference). Figure 3 The cooling air, after cooling the machine room 29, flows from the second exhaust port 26 to the exhaust pipe 23 (see reference). Figure 3 (The contents of the container) are discharged from the inside.

[0058] like Figure 5 As shown, the upper heater 8 is disposed on the top wall side of the main body 1, which includes the top wall of the heating chamber 4.

[0059] The heating cooker 100 also includes an indoor temperature detection unit 9 for detecting the internal temperature (hereinafter referred to as indoor temperature) of the heating chamber 4. The indoor temperature detection unit 9 is, for example, a thermistor, and is disposed near the upper right corner of the heating chamber 4. The indoor temperature information detected by the indoor temperature detection unit 9 is transmitted to the control unit of the control board 30.

[0060] In addition, the indoor temperature detection unit 9 is not limited to being located near the upper right corner of the heating chamber 4; it can be installed in any location where the indoor temperature can be detected.

[0061] like Figure 5As shown, the heating cooker 100 includes an infrared sensor 28 for detecting the temperature of an object to be heated, which is placed in the heating chamber 4. The infrared sensor 28 is disposed on the outer surface of the side wall of the heating chamber 4. The infrared sensor 28 is arranged such that its lens faces the heating chamber 4 through a through hole provided in the side wall of the heating chamber 4.

[0062] Furthermore, the heating cooker 100 includes a ventilation duct 27 for supplying air to the infrared sensor 28. The ventilation duct 27 is configured to guide air from below to the infrared sensor 28 along the side wall of the heating chamber 4. Cooling air after cooling the mechanical chamber 29 ( Figure 5 The solid arrow indicates that the air is delivered to the infrared sensor 28 via the ventilation pipe 27.

[0063] Air entering the heating chamber 4 through a through hole provided in the side wall of the heating chamber 4 for the configuration of the infrared sensor 28 flows at the rear of the heating chamber 4 and is discharged from the first exhaust port 25.

[0064] The control board 30, magnetron 31, inverter board 32, and fan 33 are arranged as described above. The fan 33 is driven by the control unit of the control board 30 to generate cooling air. This cooling air cools the magnetron 31 located in front of the fan 33, and the inverter board 32 and control board 30 located to the right of the fan 33.

[0065] Figure 7 This is a partial longitudinal sectional view of the heating cooker 100 as viewed from the right side. (See image below.) Figure 7 As shown, the cooling air after cooling the machine chamber 29, as indicated by arrow Q, flows from the machine chamber 29 through the lower part of the main body 1 and the gap between the back plate 22 and the back wall 4c of the heating chamber 4. Then, the cooling air is discharged from the second exhaust port 26 into the interior of the exhaust pipe 23. The exhaust from the heating chamber 4 flows as indicated by arrow P, and is discharged from the first exhaust port 25 into the interior of the exhaust pipe 23.

[0066] [Structure of the exhaust pipe]

[0067] Figure 8A and Figure 8B These are, respectively, an external perspective view and an internal perspective view of the exhaust pipe 23 of the heating cooker 100. For example... Figure 8A As shown, the exhaust duct 23 has an exhaust port 23a located at the upper part of the exhaust duct 23. Exhaust from the main body 1 is discharged to the outside of the equipment through the exhaust port 23a. Cooling air after cooling the mechanical chamber 29 and exhaust from the heating chamber 4 are mixed inside the exhaust duct 23 and then discharged through the exhaust port 23a.

[0068] like Figure 8BAs shown, the exhaust pipe 23 has a resin pipe body, an exhaust port 23a disposed at the upper part of the pipe body, a louver 23b disposed inside the pipe body, and a metal heat dissipation part 23c disposed on the inner surface of the pipe body.

[0069] The heat dissipation section 23c has a heat dissipation plate 23c1, a through hole 23c2, a protrusion 23c3, and a vertical surface 23c4. The heat dissipation section 23c is preferably made of aluminum or stainless steel, which are not prone to rust. Aluminum, in particular, has high heat dissipation properties and is inexpensive.

[0070] The vertical surface 23c4 serves as the base for the heat dissipation unit 23c, and is vertically disposed along the inner surface of the main body of the exhaust duct 23. The protrusion 23c3 is a dam-like component provided on the vertical surface 23c4, protruding forward from the vertical surface 23c4. The protrusion 23c3 cools the exhaust gas from the main body 1 by increasing the strength of the heat dissipation unit 23c and increasing the surface area of ​​the heat dissipation unit 23c when air comes into contact with it.

[0071] The heat sink 23c1 is located below the protrusion 23c3 at the vertical plane 23c4 and extends obliquely upward and forward. Through holes 23c2 are multiple through holes provided in the heat sink 23c1. The heat sink 23c1 and the inclined portion 22a of the back plate 22 (see reference) Figure 4 Parallel to the first vent 25 (see reference) provided in the inclined portion 22a, through the hole 23c2. Figure 4 Opposite.

[0072] Furthermore, in this embodiment, "parallel" can include "approximately parallel" in addition to being strictly parallel. Specifically, two surfaces or two lines can be arranged with a maximum offset of 10 degrees from their parallel configuration. In this embodiment, the through hole 23c2 has a plurality (15) of through holes arranged in the left-right direction. However, the number of through holes can also be around 10 to 20. The air discharge rate can be adjusted according to the number of through holes.

[0073] As described above, in this embodiment, the heat sink 23c1 is positioned opposite the first vent 25. On the other hand, the heat sink 23c1 is not positioned opposite the second vent 26 (see reference 25) provided on the inclined portion 22a of the back plate 22. Figure 4 ( ) Opposite. However, this disclosure is not limited thereto. The width of the heat sink 23c1, that is, the dimension of the heat sink 23c1 in the left-right direction, can also be such that the heat sink 23c1 is opposite to the second exhaust hole 26.

[0074] The louvers 23b of the exhaust duct 23 are arranged so that when viewed from the front, the exhaust flows obliquely upwards and to the right from the bottom of the exhaust duct 23. As a result, the exhaust from the exhaust duct 23 does not directly contact the room wall behind the heating cooker 100 or the top wall above the heating cooker 100, which can inhibit corrosion of the room wall.

[0075] During the operation of the heating cooker 100, the air flowing into the interior of the exhaust pipe 23 from the first exhaust port 25 comes into contact with the heat dissipation plate 23c1 of the exhaust pipe 23 and is cooled, and then passes through the through port 23c2. The air passing through the through port 23c2 comes into contact with the protrusion 23c3 and is cooled, and then mixes with the air flowing into the exhaust pipe 23 from the second exhaust port 26.

[0076] In many cases, the air flowing into the exhaust duct 23 from the second exhaust port 26 is at a lower temperature than the air flowing into the exhaust duct 23 from the first exhaust port 25. Therefore, the air discharged from the exhaust port 23a to the outside of the exhaust duct 23 is discharged at a lower temperature than the air flowing into the exhaust duct 23 from the first exhaust port 25. This results in improved user safety.

[0077] [Heating Control]

[0078] As described above, the heating cooker 100 includes an upper heater 8, a lower heater 21, and a microwave heating unit as a heating source. Additionally, the heating cooker 100 may include both or one of a steam heating unit and a hot air circulation unit. The user selects at least one suitable heating source from among the multiple heating sources by choosing the desired heating source or the desired cooking content.

[0079] The heating cooker 100 also includes a heater temperature detection unit (not shown), which is respectively disposed in the heating area heated by the upper heater and the heating area directly heated by the lower heater 21.

[0080] The heater temperature detection unit detects the temperature of the space heated by the upper heater 8 and the lower heater 21, and sends the detected temperature as heater temperature information to the control board 30 (see below). Figure 9 The control unit controls the heating source based on heater temperature information and indoor temperature information from indoor temperature detection unit 9, according to the cooking content set by the user.

[0081] In this embodiment, the heater temperature detection unit detects the temperature of the heating area directly heated by the upper heater 8 and the lower heater 21. Therefore, the control unit can control the upper heater 8 and the lower heater 21 based on high-precision heater temperature information. In this embodiment, the heating cooker 100 performs rapid heating by rapidly increasing the temperature of the heating chamber 4 through the upper heater with a large output. Therefore, high-precision heater temperature information is useful in rapid heating.

[0082] [Heating and cooking action]

[0083] Figure 9 This is a circuit diagram related to the control of the heating source in the heating cooker 100. (Example) Figure 9 As shown, the upper heater 8 and the lower heater 21 are respectively connected to their corresponding switching elements. The magnetron 31 is connected to the inverter circuit of the inverter substrate 32.

[0084] In the heating cooker 100, power exceeding the specified rated power cannot be used. On the other hand, multiple heating sources can be used in the heating cooker 100. The control unit of the control board 30 controls the multiple heating sources so that the total power consumption of the heating sources to be activated is always within the rated power.

[0085] In this embodiment, for example, the maximum output of the upper heater 8 is 900W and the maximum output of the lower heater 21 is 700W. Therefore, the combined maximum output of the upper heater 8 and the lower heater 21 exceeds the rated power of a typical household (1500W = 15A (rated current) × 100V).

[0086] The heating cooker 100 incorporates a three-terminal bidirectional thyristor switch as its switching element. The upper heater 8 is driven and controlled by the three-terminal bidirectional thyristor switch. With this configuration, the output of the upper heater 8 can be steplessly varied within the range of 300W to 900W by means of a control signal input to the three-terminal bidirectional thyristor switch. On the other hand, the lower heater 21 is controlled to turn on and off by switching the switching element. However, the lower heater 21 can also be steplessly controlled using a three-terminal bidirectional thyristor switch, similar to the upper heater 8.

[0087] The heating and cooking operation of the heating cooker 100 of this embodiment will be described below. When using the upper heater 8 and the lower heater 21, the control unit of the control board 30 sets the output of the upper heater 8 to 700W, turns on the lower heater 21 (700W), and heats the heating chamber 4 from above and below with a total output of 1400W.

[0088] When using the upper heater 8 and the microwave heating unit, the control unit, for example, sets the output of the upper heater 8 to 900W as the maximum output, disconnects the lower heater 21 (0W), and heats the heating chamber 4 from above.

[0089] Regarding the microwave heating unit, the control unit sets the output power of the magnetron to, for example, 450W, and supplies microwaves to the heating chamber 4. As a result, the heating plate 6 housed in the heating chamber 4 heats up, heating the food placed on the heating plate 6.

[0090] As another example, the control unit can also disconnect the lower heater 21 (0W), set the output of the upper heater 8 to 430W, and set the output power of the magnetron to, for example, 550W.

[0091] As described above, according to this embodiment, even when using the upper heater 8 and the microwave heating unit, it is possible to perform the desired cooking with a power consumption of less than the rated power (1500W).

[0092] As described above, according to this disclosure, the heated air can be discharged from the exhaust pipe after its temperature has decreased in the exhaust pipe. This disclosure is applicable to heating cookers such as microwave ovens and ovens.

Claims

1. A heating cooker, wherein, The heating cooker includes: main body; A heating chamber, located inside the main body, is capable of housing the object to be heated; A magnetron configured to generate microwaves for supplying to the heating chamber; A control board configured to control the drive of the magnetron; An air supply fan is configured to cool the magnetron and the control board. as well as An exhaust duct is provided at the rear of the heating chamber and has an exhaust port configured to discharge exhaust air from the heating chamber and cooling air generated by the blower fan. The exhaust pipe has a metal heat dissipation section disposed inside the exhaust pipe.

2. The heating cooker according to claim 1, wherein, The main body has: a back surface disposed behind the heating chamber; and a first exhaust port disposed on the back surface, configured to exhaust the exhaust gas from the heating chamber. The heat dissipation section has a through hole opposite to the first exhaust hole.

3. The heating cooker according to claim 2, wherein, The main body also has a second exhaust port, which is disposed on the back side and configured to discharge the cooling air. The second exhaust port is located inside the exhaust pipe.

4. The heating cooker according to claim 2, wherein, The first vent includes a plurality of holes disposed on the inclined portion of the back side of the main body. The heat dissipation section has a protrusion that is arranged substantially parallel to the inclined section and protrudes forward from the heat dissipation section. The through hole includes a plurality of holes disposed on the protrusion.

5. The heating cooker according to claim 1 or 2, wherein, The heat dissipation section is made of aluminum.

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