JP2008224081A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker enabling to keep a circuit board provided on a door at a certain temperature or lower. <P>SOLUTION: A cooling means 60 is provided on the door 20 for cooling the circuit board 27a provided on the door 20, thereby keeping the circuit board 27a provided on the door 20 at a certain temperature or lower to maintain initial performance for a long period. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cooking device having a high frequency generating means and a heating means.

2. Description of the Related Art Conventionally, there is known a high-frequency heating cooking apparatus that cools an air layer between a pair of glass plates constituting a double window so as not to burn even if a user touches a see-through window of a door (for example, see Patent Document 1) ).
FIG. 21 shows a door 101 of a high-frequency cooking device 100 described in Patent Document 1. The door 101 includes an outer glass plate 103 a attached to the door casing 102, a metal plate door radio wave seal portion 104 having a plurality of punching holes, and an inner glass plate 103 b attached to the door radio wave seal portion 104. And a door casing cover 105. An air layer 106 is provided between the glass plates 103 a and 103 b, and an air inflow portion 107 a and an outflow portion 107 b communicating with the air layer 106 are provided. The door 101 has a cooling means 110, a cooling fan 111, a duct 113 a that guides cooling air generated by the cooling fan 111 to the cooling fin portion 112 b of the magnetron 112 a, and a duct that further guides the inflow portion 107 a of the door 101. 113b. The cooling fan 111 is controlled by the air volume control means 114.

As a result, the temperature of the glass plates 103a and 103b of the door 101 can be kept low, and even if the user touches the glass plate 103a unexpectedly, it can be safely used without being burned.
Japanese Patent Laying-Open No. 2005-273933 (FIG. 3)

  By the way, in recent years, a heating cooker in which a circuit board operated by an operation unit or an operation unit is provided on a door has been proposed. In such a heating cooker, since the circuit board is vulnerable to heat, there is a need for a heating cooker that can maintain the circuit board below a certain temperature.

  The present invention has been made to solve the conventional problems, and an object thereof is to provide a cooking device capable of maintaining a circuit board provided on a door at a predetermined temperature or lower.

  The heating cooker of the present invention has a main body including a heating chamber that accommodates an object to be heated, a door that closes the opening of the heating chamber, and circulates cooling air and a circuit board provided on the door. Accordingly, a cooling means for cooling the circuit board is provided.

  With this configuration, the cooling means is provided on the door that opens and closes the opening of the heating chamber of the main body, and the cooling air is circulated. Therefore, the circuit board provided on the door is maintained at a predetermined temperature or less to maintain the initial performance. It can be maintained for a long time.

  The present invention provides a cooking device having an effect that the circuit board provided on the door can be maintained at a constant temperature or lower by providing the door with cooling means for cooling the circuit board provided on the door. It is something that can be done.

Hereinafter, the heating cooker of embodiment of this invention is demonstrated using drawing.
FIG. 1 is a perspective view of a heating cooker according to an embodiment of the present invention, FIG. 2 is a perspective view showing the inside of the heating cooker, FIG. 3 is a cross-sectional view showing the inside of the heating cooker, and FIG. FIG. 5 is a front view of the infrared sensor viewed from the direction V in FIG. 4, FIG. 6 is a perspective view showing one form of the high-frequency radiation part, FIG. 7 is an enlarged perspective view of the reflector, and FIG. FIG. 9 is an exploded perspective view of the door viewed from the front, FIG. 10 is an exploded perspective view of the door handle, and FIG. 11 is an exploded perspective view of the door viewed from the rear. 12 (A) and 12 (B) are cross-sectional views of the lower portion of the door, FIG. 13 is a perspective view of the back side decorative cover as seen from the back side, FIG. 14 is a perspective view of the cooling means provided in the main body, and FIG. FIG. 16 is a sectional view showing the flow of cooling air in the air blowing section and the duct. 17A is a perspective view of the grill pan, FIG. 17B is a sectional view, FIG. 18A is a perspective view of the water tank, FIG. 18B is an exploded perspective view of the water tank, FIG. (C) is a perspective view seen from the direction C in FIG. 18 (A), FIG. 19 is a perspective view of a water tank and a saucer, and FIG. 20 is a perspective view of a water tank to which the saucer is attached.

  As shown in FIGS. 1-3, the steam generator additional heat cooker 10 as a heating cooker has a rectangular box-shaped main body 12 having a heating chamber 11 in which a front surface is opened and an object to be heated M is accommodated. The door 20 opens and closes the opening of the main body 12. As shown in FIGS. 2 and 3, the heating chamber 11 includes a circulation fan 13 that stirs and circulates the air in the heating chamber 11, a convection heater 14 that heats the air circulated in the heating chamber 11, and a heating chamber. An infrared sensor 15 that is provided on the side wall 11c of the eleventh and detects the temperature in the heating chamber 11 is provided. A concave portion 11b is provided at the center of the bottom plate 11a of the heating chamber 11, and a high frequency radiation portion 30 that radiates a high frequency (microwave) is provided in the concave portion 11b. Since the concave portion 11b is usually covered with a plate, the high-frequency radiation portion 30 is hidden. Moreover, the steam generation part 40 is provided in the back | inner side of the recessed part 11b in the baseplate 11a.

  The heating chamber 11 is partitioned by a partition plate 16 provided at the back of the heating chamber 11, and a space 17 is provided between the rear wall 12 a of the main body 12, and the circulation fan 13 and the space 17 are provided in the space 17. A convection heater 14 is provided. The partition plate 16 is provided with a plurality of intake vent holes 16 a in the center, and a plurality of ventilation vent holes 16 b are provided at the peripheral edge of the partition plate 16. Therefore, the circulation fan 13 sucks the air in the heating chamber 11 from the intake vent hole 16a and heats it by the convection heater 14, and sends the heated air to the heating chamber 11 from the ventilating vent hole 16b. The inside can be heated.

  As shown in FIGS. 2 and 4, a triangular prism-shaped projection 11d is provided to protrude into the heating chamber 11 on the right side wall 11c of the heating chamber 11, and an infrared sensor 15 is provided inside the projection 11d. Is provided. A window 11e is cut out on the lower surface of the protrusion 11d, and the measurement light from the infrared sensor 15 is projected into the heating chamber 11. The infrared sensor 15 can be swung by a swing mechanism 15a and, as shown in FIG. 5, is directed to the heating chamber 11 through the window 11e during cooking (indicated by a solid line in FIG. 5). Thereafter, the head is shaken so that the lens of the infrared sensor 15 is detached from the window 11e (indicated by a dotted line in FIG. 5). In addition, as shown in FIG. 2, the left and right side walls 11c, 11c of the heating chamber 11 are provided with a plurality of horizontally extending support protrusions 11f in the front-rear direction in order to support the grill pan 50 for a high-frequency cooker. (In FIG. 2, for example, three stages) are provided.

  As shown in FIG. 5, the infrared sensor 15 is mounted eccentrically from the center of the window 11e. By swinging the infrared sensor 15, the lens can be completely removed from the window 11e. This is because the steam S in the heating chamber 11 is condensed on the lens of the infrared sensor 15 when cooking by using the steam S by removing it from the window 11e except during temperature measurement, and the subsequent cooking. This is to prevent the occurrence of a deviation in temperature detection at the time.

  As shown in FIGS. 2, 3, and 6, the high-frequency radiation unit 30 includes a magnetron 31 that generates a high frequency in a machine room below the bottom plate 11 a of the heating chamber 11, and the high frequency from the magnetron 31 is A waveguide 31a leading to the first and second rotating antennas 32 and 33 is provided. In addition, the first rotating antenna 32 that radiates a high frequency from the magnetron 31 and the second rotating antenna 33 that emits a higher frequency than the first rotating antenna 32 are provided in the recess 11b on the upper surface of the bottom plate 11a. Further, an evaporating dish 41 of the steam generating unit 40 is provided on the back side of the recess 11b in the bottom plate 11a, and an evaporating dish heater 42 (see FIG. 3) is provided on the lower side of the evaporating dish 41. . As shown in FIG. 6, a second rotating antenna 33 having a large output is provided on the side close to the evaporating dish 41, and a first rotating antenna 32 having a low output is provided on the side far from the evaporating dish 41. . The first rotating antenna 32 and the second rotating antenna 33 are arranged along the left-right direction (left-right direction in FIG. 6) that intersects the depth direction of the heating chamber 11.

  As described above, since the two rotating antennas of the first rotating antenna 32 and the second rotating antenna 33 are arranged along the direction intersecting the depth direction of the heating chamber 11, the heating chamber is a horizontally long heating chamber. Also, the high frequency can be radiated uniformly to the entire heating chamber 11, and the heating efficiency is improved. Further, since the evaporating dish 41 is disposed near the second rotating antenna 33, which is a high-power antenna, the water for evaporation boils quickly due to the high frequency, and the time until the generation of the steam S is shortened to reduce the cooking time. Shortening can be achieved.

  In addition, the output of the rotating antennas 32 and 33 is larger as the size of the antenna is larger. Further, the longer the shaft length of the rotary shafts 32a and 33a, the larger the output. Reflecting plates 34a and 34b are provided in the vicinity of the front (downward in FIG. 6) of the first rotating antenna 32 and the second rotating antenna 33 in the recess 11b. As shown in FIG. 7, the reflecting plates 34a and 34b can be provided by cutting and raising the concave portion 11b. Alternatively, the reflecting plates 34a and 34b can be attached by screwing or the like. As described above, since the reflecting plates 34a and 34b are provided in front of the rotating antennas 32 and 33, the high frequency waves that hit the rotating antennas 32 and 33 and go to the front of the heating chamber 11 are reflected by the reflecting plates 34a and 34b. I try to go inside. Thereby, heating efficiency can be improved and cooking time can be shortened.

  Alternatively, as shown in FIG. 8, the first rotating antenna 32 having a small output can be disposed on the side close to the evaporating dish 41, and the second rotating antenna 33 having a large output can be disposed on the side far from the evaporating dish 41. In this case, when cooking using only the microwave oven or only the microwave oven and when it is not desired to generate steam, the output from the high-power second rotating antenna 33 is not used for heating the evaporating dish 41. It can be used effectively for cooking, and the cooking time can be shortened. As in the case described above with reference to FIG. 6, reflectors 34a and 34b are provided in the vicinity of the front of the first rotating antenna 32 and the second rotating antenna 33 (downward in FIG. 8) in the recess 11b. .

  A door 20 is shown in FIGS. 1 and 9 to 12. As shown in FIG. 1, the door 20 closes the opening of the heating chamber 11 of the heating cooker body 12, and the entire front surface of the door 20 is covered with a glass plate 21. 12A is a cross-sectional view at a position where the heat radiating plate 27c is divided, and FIG. 12B is a cross-sectional view at a position where the heat radiating plate 27a is connected.

  As shown in FIG. 9, the door 20 has a door casing 22 that is a metal rectangular frame member. On the front side (left side in FIG. 9) of the door casing 22, a door decoration 23 and a rectangular plate shape are provided. The glass plate 21 and the decorative plate 24 are provided. The door housing 22 has an opening 22a at the center, and an operation portion 22b below the opening 22a. Further, the operation portion 22b is provided with a notch 22d for the liquid crystal display portion 22c and a hole 22e for the dial 26, and a hole 22f for attaching the handle 25 is provided at the upper portion. The door decoration 23 is a rectangular frame member, and is provided with a notch 23a for the display unit and a hole 23b for the dial 26 on the lower side. The glass plate 21 is a single transparent glass plate and covers the entire front surface of the door 20. One hole 21a for the dial 26 is provided in the lower part of the glass plate 21, and a plurality of holes 21b for attaching the handle 25 are provided in the upper part. In addition, the decorative plate 24 covers the peripheral edge and the lower side of the glass plate 21, and reinforces the glass plate 21 and improves the appearance.

  As shown in FIG. 10, the handle 25 has a base member 25a attached to the upper part of the door 20, a gripping bar 25b to be gripped by a user by hand, and a stop member 25c for mounting the gripping bar 25b to the base member 25a. is doing. The base member 25a has a pair of left and right blocks 25d and a connecting member 25e that connects both the blocks 25d. The block 25d is provided with a plurality of (for example, two) projections 25f each having a pair of columnar shapes for attachment, and passes through the hole 21b of the glass plate 21 and the hole 23c of the door decoration 23 to form a door housing. 22 is inserted into the hole 22f and screwed from the back of the door housing 22. The block 25d is provided with a circular protrusion 25g for attaching the gripping rod 25b. The block 25d is inserted into the mounting hole 25h provided in the gripping rod 25b for positioning, and the stop member 25c is positioned at the end of the gripping rod 25b. The gripping rod 25b is fixed to the block 25d by being inserted from the portion and locking the protrusion 25g.

  Thus, since the front surface of the door 20 that opens and closes the opening of the heating chamber 11 of the main body 12 is covered with the single glass plate 21 over substantially the entire area, the glass plate 21 serves as a reinforcing plate. For this reason, the twist strength and bending strength of the door 20 can be improved, the adhesion of the door 20 to the main body 12 is improved, and the heating efficiency is improved. Further, since the front surface is covered with one glass plate 21, the design is neat and the liquid crystal display portion 22c is viewed through the glass plate 21, so that a sense of depth is obtained and the design is improved. Moreover, since it can operate with one dial 26, while processing of the glass plate 21 grade | etc., Becomes easy, the fall of heat insulation efficiency can be decreased. The dial 26 has a function of setting manual heating selection, automatic heating selection, manual heating time setting, steam supply time setting, automatic heating finish adjustment, and the like. As disclosed in Japanese Patent No. 50539, the front surface of the door 20 is covered with a single glass plate, and this is combined with a single dial having such a function, so that various settings can be made. It is possible with a simple appearance without dropping.

  FIG. 11 shows a structure inside the door 20. As shown in FIG. 11, an operation board 27a which is a circuit board provided on the door 20 and a cooling means 60 (see FIG. 12) for cooling the operation board 27a by circulating cooling air are provided.

  That is, as shown in FIGS. 11 and 12, on the rear side (right side in FIG. 11) of the operation portion 22b at the bottom of the door housing 22, there are an operation board 27a, a resin board lid 27b, and an aluminum heat sink 27c. Are provided sequentially. In addition, on the rear side of the entire door housing 22, a radio side sealing plate 28 and a back side decorative cover 29 that makes up the inner surface of the door 20 are provided. The radio wave seal plate 28 has a heat resistant glass 28b attached to an opening of a rectangular metal frame 28a, and is screwed to the rear surface of the door casing 22.

  Therefore, the operation board 27 a, the board lid 27 b, and the heat radiating plate 27 c are attached between the door casing 22, the radio wave seal plate 28, and the back side decorative cover 29. A space 28 d for cooling is formed between the heat radiating plate 27 c and the back decorative cover 29, and an air flow path is formed along the width direction of the door 20.

  As shown in FIG. 13, the back decorative cover 29 is a resin member having a rectangular frame shape, and the space 28d described above is formed between the lower side 29a and the heat radiating plate 27c. Further, both end portions of the lower side 29a are notched, and air holes 29b continuing to the space 28d are provided at both end portions. Therefore, one air hole 29b acts as a suction port for taking in cooling air from the duct 62 (see FIG. 15) of the main body 12, and the other air hole 29b is an exhaust port through which the air that has cooled the operation board 27a exits. Will act as.

  As shown in FIG. 16, the cooling means 60 guides the blower 61 having a fan 61 a and the like provided in the space below the bottom plate 11 a of the main body 12 and the cooling air from the blower 61 to the front surface of the main body 12. A duct 62 is provided. The air blowing port 62a of the duct 62 faces the air hole 29b as the suction port of the back side decorative cover 29 when the door 20 is closed, and sends cooling air into the space 28d inside the door 20. The cooling air thus sent cools the heat radiating plate 27c, the operation board 27a, and the like, and is then discharged to the outside through an air hole 29b as an exhaust port at the downstream end of the space 28d of the back side decorative cover 29.

  With this configuration, the cooling means 60 is provided in the door 20 that opens and closes the opening of the heating chamber 11 of the main body 12 so that the cooling air is circulated, so that the operation board 27a provided in the door 20 is kept below a certain temperature. Thus, the initial performance can be maintained for a long time.

  As shown in FIGS. 17A and 17B, the high-frequency cooking grill pan 50 collects oil and the like without contacting the object to be heated M, and the peak portion 51a that is supported by contacting the object to be heated M. A dish main body 51 having a trough part 51 b and a radio wave absorption heating element (ferrite) 52 provided in a region corresponding to the peak part 51 a and the trough part 51 b on the back side of the dish main body 51 are provided. As shown in FIG. 17B, the radio wave absorption heating element 52 has a configuration in which the thickness dimension T1 of the region corresponding to the valley 51b is thinner than the thickness dimension T2 of the region corresponding to the peak 51a. Yes. For example, the thickness dimension T1 of the region corresponding to the valley 51b can be about 0.8 mm, and the thickness dimension T2 of the region corresponding to the peak 51a can be about 1.4 mm. That is, T1: T2 = 1: 1.5.

  With this configuration, in the high-frequency cooking grill pan 50 having the crest 51a that contacts the object to be heated M and the trough 51b that does not contact the object to be heated M, the radio wave absorption heat that generates heat by contacting the back surface of the crest 51a. The thickness T2 of the body 52 is set to be larger than the thickness T1 of the radio wave absorption heating element 52 that generates heat by contacting the back surface of the valley portion 51b that does not contact the object to be heated M. For this reason, the peak part 51a with the large thickness of the electromagnetic wave absorption heat generating body 52 can be heated intensively, and cooking time can be shortened.

  Moreover, as for the high frequency cooking grill pan 50, it is preferable that the pan body 51 is made of aluminum. Thus, by forming the plate body 51 with aluminum having a high thermal conductivity, the heating efficiency is improved and the cooking time can be shortened.

  Furthermore, the high-frequency cooking grill pan 50 preferably has an unpainted region in contact with the radio wave absorption heating element 52 on the back surface of the pan body 51. Thus, by making the pan body 51 in contact with the radio wave absorption heating element 52 unpainted, the thermal conductivity is improved and the cooking time can be shortened.

  The high frequency cooking grill pan 50 is slid on the support protrusions 11f provided on the left and right side walls 11c of the heating chamber 11 and puts in and out of the heating chamber 11. The slide member 53 which is easy to slide and rich in heat resistance is screwed.

  As shown in FIG. 18, the water tank 70 stores water for generating steam S and is detachably provided below the front surface of the main body 12 of the high-frequency cooker 10. That is, as shown in FIG. 19, a rectangular tank-shaped water tank storage portion 72 having a front opening and an insertion port 72a is attached to the lower front portion of the main body 12, so that the water tank 70 can be inserted. ing. The water tank storage portion 72 protrudes forward from the front surface of the main body 12, but is retracted rearward from the front surface of the door 20.

  Further, as shown in FIG. 18, a gripping portion 71 is provided on the front surface of the water tank 70, and the gripping portion 71 intersects with the attachment / detachment direction (front-rear direction) of the water tank 70 (FIG. 18 ( B) is detachable along the left-right direction). That is, a guide rail 73b is provided on the front surface of the tank body 73 along the sliding direction of the gripping portion 71, and a slide guide 71a that is slidable along the guide rail 73b is provided on the back surface of the gripping portion 71. It has been.

  Therefore, it is possible to easily clean the grip 71 and the attachment position of the grip 71 (that is, the front surface of the tank body 73). Further, since the grip portion 71 can be slid along the direction intersecting the attaching / detaching direction of the water tank 70 with respect to the main body 12, the water tank 70 can be attached to and detached from the main body 12. In addition, it is possible to prevent the gripping portion 71 from unintentionally dropping from the water tank 70.

  As shown in FIG. 18, the water tank 70 is provided at a bottomed frame-shaped tank body 73, a lid 74 having a covering surface that covers the opening surface (upper surface) of the tank body 73, and an edge of the opening. A first protrusion 73a that protrudes in a direction away from the tank body 73 along the opening surface, and a second protrusion 74a that is provided at the periphery of the lid 74 and protrudes in a direction away from the lid 74 along the covering surface. The first protrusion 73a and the second protrusion 74a have a configuration in which the phases are arranged along the same surface of the opening surface and the closing surface.

  As shown in FIG. 18B, the bottom plate 73c of the tank main body 73 has the lowest central portion, and collects in the central portion when the amount of stored water becomes small. A water absorption pipe 75 for sucking out the stored water is attached to the inner surface of the rear wall 73d of the tank body 73, and the opening at the tip is located slightly above the center of the bottom plate 73c. The other end of the water absorption pipe 75 is opened (75a) on the back surface of the rear wall 73d of the tank body 73 (see FIG. 18C). When the water tank 70 is accommodated in the main body 12, the opening 75 a is connected to a water absorption device (not shown) provided in the main body 12 so that the water accommodated in the water tank 70 is supplied to the evaporating dish 41. It has become. The lid 74 is provided with a small lid 74b for replenishing water to the water tank 70, and the user replenishes the water by removing the small lid 74b.

  Accordingly, since the first protrusion 73a and the second protrusion 74a are phase-arranged along the same surface of the opening surface and the closing surface, the lid 74 can be reliably closed and the tank body 73 and the lid 74 can be closed. The lid 74 can be easily removed by twisting.

  The grip portion 71 is made of a coloring member similar to a water drop tray described later, and the width of the display portion 76 for displaying the water level is made part of the front width of the water tank 70 so that the full width is transparent. The water level in the inside can be clearly discriminated compared with the case where it is set, and the appearance when set in the main body 10 is made good. In addition, it is preferable that the inner surface of the display unit 76 that displays the water level in the water tank 70 is subjected to a graining process. Thereby, the water level of the transparent water accommodated in the water tank 70 can be visually recognized reliably.

  Further, as shown in FIG. 20, on the front upper part of the water tank 70 and on both the left and right sides of the water tank 70, receiving trays 77 are provided for receiving water drops that are dropped when the door 20 is closed after cooking using the steam S. ing. The tray 77 is positioned below the boundary between the door 20 and the main body 12 when the water tank 70 is stored in the water tank storage portion 72 of the main body 12. In the region 77b above the water tank 70 in the tray 77, the received water droplets are distributed to the left and right and stored in the left and right water storage portions 77a.

  In addition, the cooking device of this invention is not limited to embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.

  As mentioned above, the heating cooker concerning this invention can maintain the circuit board provided in the door below a fixed temperature by providing the door with the cooling means which cools the circuit board provided in the door. It is useful as a cooking device having high-frequency generating means and heating means.

The perspective view of the heating cooker concerning embodiment of this invention The perspective view which shows the inside of a heating cooker Sectional view showing the inside of the heating cooker Sectional view showing the mounting part of the infrared sensor Front view of infrared sensor viewed from direction V in FIG. The perspective view which shows one form of a high frequency radiation | emission part Enlarged perspective view of reflector The perspective view which shows another form of a high frequency radiation | emission part The exploded perspective view which looked at the door from the front Exploded perspective view of door handle Exploded perspective view of the door as seen from the rear (A) and (B) are sectional views of the lower part of the door The perspective view which looked at the back side cosmetic cover from the back side The perspective view which shows the cooling means provided in the main body Perspective view of duct provided on the front of the main unit Sectional drawing which shows the flow of the cooling air in a ventilation part and a duct (A) is a perspective view of the grill pan, (B) is a cross-sectional view of the grill pan. (A) is a perspective view of a water tank, (B) is an exploded perspective view of the water tank, (C) is a perspective view seen from the direction C in FIG. 18 (A), Perspective view of the main body with a water tank storage part at the lower front Perspective view of water tank and saucer Sectional drawing which shows the cooling means of the door of the conventional heating cooker

Explanation of symbols

11 Heating chamber 12 Body 20 Door 27a Operation board (circuit board)
60 Cooling means M Object to be heated

Claims (1)

A main body provided with a heating chamber for accommodating an object to be heated;
A door for closing the opening of the heating chamber;
A circuit board provided on the door;
A heating cooker comprising cooling means for cooling the circuit board by circulating cooling air.

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