JP2017026233A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker which cools an operation part with high efficiency and prevents failure caused by heat.SOLUTION: A heating cooker comprises: a body casing; a heating chamber disposed in the body casing and having an opening at a front side; and a door (3) for opening and closing the heating chamber. The door (3) has: an operation part which is disposed on the front side so as to overlap with the opening when the heating chamber is closed; an air passage (92) which is provided in the door (3) and used to supply and discharge external air to the back side of the operation part (9); and a blower fan (95) arranged in an intermediate portion of the air passage (92).SELECTED DRAWING: Figure 9

Description

  The present invention relates to a cooking device.

  Conventionally, as a heating cooker, there exists a thing described in patent document 1, for example. This cooking device includes a main body casing, a heating chamber disposed in the main body casing, and a door for opening and closing the heating chamber. An operation unit is provided on the door of the cooking device. This operation part is arranged so that a part thereof overlaps the heating chamber with the door closed.

  Moreover, the said cooking-by-heating machine has the flow path along the support plate which supports an operation part in the inside of a door, and the ventilation fan is arrange | positioned in this flow path. The air flow is generated in the flow path by the blower fan to cool the support plate, thereby preventing the heat in the heating chamber from being transmitted to the operation unit via the support plate.

JP 2013-164237 A

  However, in the heating cooker, the blower fan is provided in the vicinity of the air inlet of the flow path, and the support plate is cooled only by the exhaust of the blower fan, so that the exhaust of the blower fan is discharged outside the door. The path to pass through is long and the cooling efficiency is poor. For this reason, the support plate cannot be sufficiently cooled, and heat in the heating chamber is transmitted to the operation unit, which may cause failure of the operation unit.

  Then, the subject of this invention is providing the cooking device which can cool the operation part highly efficiently and can prevent generation | occurrence | production of the malfunction by heat.

In order to solve the above problems, the heating cooker of the present invention is
A body casing;
A heating chamber disposed within the main casing and having an opening on the front side;
A door for opening and closing the heating chamber;
With
The door
An operation unit arranged on the front surface side so as to overlap the opening when the heating chamber is closed,
An air flow path provided inside the door for supplying and discharging external air to the back side of the operation unit;
A blower fan disposed in an intermediate portion of the air flow path;
It is characterized by having.

  According to the present invention, since the blower fan is disposed in the middle portion of the air flow path provided inside the door, the upstream air flow path by the intake of the blower fan and the downstream by the exhaust of the blower fan The air flow path is substantially the same length. Thereby, since the pressure loss of the air flow which flows through a flow path is reduced, an operation part can be cooled efficiently and generation | occurrence | production of the malfunction by heat can be prevented.

  Further, for example, by providing the exhaust port of the flow path above the air supply port, heat conducted from the heating chamber to the upper side of the door can be efficiently discharged to the outside of the door. Thereby, especially the heat from the heating chamber in which the upper region becomes high temperature can be surely cut off.

It is a schematic front view at the time of door closing of the heating cooker of 1st Embodiment of this invention. It is a schematic front view at the time of door opening of the heating cooker of FIG. It is a schematic diagram for demonstrating the structure of the principal part of the heating cooker of FIG. It is a perspective view which shows the state which removed a part of main body casing of the heating cooker of FIG. It is a control block diagram of the heating cooker of FIG. It is a front view of the door of the heating cooker of FIG. It is a rear view of the door of the heating cooker of FIG. It is a right view of the door of the heating cooker of FIG. It is a figure for demonstrating the flow path inside the door of the heating cooker of FIG. It is sectional drawing in alignment with the XX line shown in FIG. 6 of the door of the heating cooker of FIG. It is the elements on larger scale of FIG. It is sectional drawing along the XI-XI line shown in FIG. 6 of the door of the heating cooker of FIG. It is the schematic which shows the structure of the control apparatus of the heating cooker of 3rd Embodiment of this invention.

(First embodiment)
FIG. 1 is a schematic front view of the heating cooker according to the first embodiment of the present invention when the door is closed. FIG. 2 is a schematic front view of the cooking device of FIG. 1 when the door is opened.

  As shown in FIGS. 1 and 2, the heating cooker according to the first embodiment includes a rectangular parallelepiped main body casing 1 and a heating chamber 2 provided in the main body casing 1 and having an opening 2 a on the front surface side. And a door 3 for opening and closing the opening 2a of the heating chamber 2.

  The main body casing 1 is provided with an exhaust duct 5, a dew acceptor 6, and a water supply tank 26. The exhaust duct 5 is attached to the rear part of the upper surface of the main casing 1. The dew receiving device 6 is detachably attached to the lower part of the front surface of the main casing 1 so as to receive water droplets from the rear surface of the door 3 (the surface on the heating chamber 2 side). The water supply tank 26 is detachably attached to the lower part of the front surface of the main casing 1.

  The heating chamber 2 has a substantially rectangular parallelepiped shape, the object to be heated 15 is accommodated therein, and a metal cooking tray (not shown) can be placed in and out freely. A pair of upper shelf receivers 16A and 16B and a pair of lower shelf receivers 17A and 17B disposed below the upper shelf receivers 16A and 16B are provided on the left side surface portion 2b and the right side surface portion 2c of the heating chamber 2. Yes. The pair of upper shelf receivers 16A and 16B and the pair of lower shelf receivers 17A and 17B are formed so as to support the cooking tray.

  In addition, a contact portion (not shown) is provided at the rear end of each of the upper shelf receivers 16A and 16B and the lower shelf receivers 17A and 17B. The abutting portion is formed so as to abut on the cooking tray before the cooking tray contacts the rear surface portion 2 d of the heating chamber 2 when the cooking tray is disposed in the heating chamber 2. By this contact portion, a gap of 3 mm, for example, is formed between the cooking tray and the rear surface portion 2d of the heating chamber 2.

  The door 3 has a shape capable of opening and closing the opening 2 a of the heating chamber 2, and is attached to the front surface of the main body casing 1 so as to be rotatable about a lower end side.

  FIG. 3 is a schematic diagram for explaining a configuration of a main part of the heating cooker in FIG. 1.

  The structure of the main part of the said heating cooker is demonstrated using FIG. 2, FIG. FIG. 3 shows the heating chamber 2 as viewed from the left side.

  As shown in FIG. 3, the heating cooker includes a circulation duct 18, a circulation fan 19, an upper heater 20, an intermediate heater 21, a lower heater 22, a circulation damper 23, a steam generator 70, a tube pump 25, and a water supply tank 26. It consists of Each of the upper heater 20, the middle heater 21, and the lower heater 22 includes, for example, a sheathed heater. The tube pump 25 may be any pump as long as it can switch between a water supply operation and a water discharge operation depending on the driving direction.

  As shown in FIGS. 2 and 3, the circulation duct 18 includes a suction port 27 provided in the inclined surface portion 2 f of the heating chamber 2, an upper air outlet 28 provided in the upper surface portion 2 e of the heating chamber 2, and a heating It communicates with the inside of the heating chamber 2 through first to third rear outlets 29 to 31 provided on the rear surface portion 2 d of the chamber 2. The circulation duct 18 is provided from the upper side to the rear side of the heating chamber 2 and extends so as to exhibit an inverted L shape. The width of the circulation duct 18 in the left-right direction is set to be narrower than the width of the heating chamber 2 in the left-right direction.

  The circulation fan 19 is a centrifugal fan and is driven by a circulation fan motor 56. When the circulation fan motor 56 drives the circulation fan 19, gas such as air or saturated steam (hereinafter referred to as “air”) in the heating chamber 2 is sucked into the circulation duct 18 from the suction port 27, and the circulation fan 19. 19 is flowed outward in the radial direction. More specifically, on the upper side of the circulation fan 19, the gas flows obliquely upward from the circulation fan 19 and then flows from the rear toward the front. On the other hand, on the lower side of the circulation fan 19, the gas flows obliquely downward from the circulation fan 19 and then flows downward from above.

  A plurality of steam supply ports 37 are provided around the suction port 27 of the inclined surface portion 2 f of the heating chamber 2. A plurality of forced exhaust ports 48 are provided at one end (right side in FIG. 2) of the inclined surface portion 2f, and a plurality of air supply ports 50 are provided at the other end (left side in FIG. 2) of the inclined surface portion 2f. ing.

  The upper heater 20 is provided in the circulation duct 18 and is disposed so as to face the upper surface portion 2 e of the heating chamber 2. The upper heater 20 heats the gas flowing to the upper outlet 28.

  The middle heater 21 is provided in the circulation duct 18 and is disposed so as to surround the circulation fan 19. The middle heater 21 heats the gas from the circulation fan 19 toward the upper heater 20 or heats the gas from the circulation fan 19 toward the lower heater 22.

  The lower heater 22 is provided in the circulation duct 18 and is disposed so as to face the rear surface portion 2 d of the heating chamber 2. The lower heater 22 heats the gas flowing to the second and third rear outlets 30 and 31.

  The circulation damper 23 is rotatably provided in the circulation duct 18 and is disposed between the middle heater 21 and the lower heater 22. The circulation damper 23 is rotated by a circulation damper motor 59 (shown in FIG. 5) to open and close the first rear outlet 29.

  The steam generator 70 includes a metal steam generating container 71 having an upper opening, a lid portion 72 made of a heat-resistant resin (for example, PPS (polyphenylene sulfide) resin) covering the upper opening of the steam generating container 71, steam, And a steam generating heater 73 formed of a sheathed heater cast into the bottom 71a of the generating container 71.

  On the bottom 71 a of the steam generation container 71, water from the water supply tank 26 is accumulated. The water accumulated in the steam generation container 71 is heated by the steam generation heater 73 to become saturated steam, and is heated through the resin steam tube 35, the metal steam pipe 36, and the plurality of steam supply ports 37. It is supplied into the chamber 2. In FIG. 3, only one of the plurality of steam supply ports 37 is shown. The saturated steam supplied into the heating chamber 2 through the plurality of steam supply ports 37 is sucked into the circulation duct 18 from the plurality of suction ports 27 by the function of the circulation fan 19, and the middle heater 21 and the upper heater 20 or the lower heater 22 is heated to 100 ° C. or more to become superheated steam, and enters the heating chamber 2 from the upper outlet 28, the first rear outlet 29, the second rear outlet 30, and the third rear outlet 31. Blown out. Thus, the superheated steam circulates in the heating chamber 2 and the circulation duct 18 together with the air, and cooking is performed.

  A water level sensor 75 comprising a pair of electrode rods 75a and 75b is attached to the lid portion 72. Whether or not the water level on the bottom 71a of the steam generation container 71 has reached a predetermined level is determined based on whether or not the electrode rods 75a and 75b are in a conductive state.

  The tube pump 25 includes a rotatable roller (not shown) and an elastically deformable water supply / drainage tube 40 made of silicon rubber or the like that is squeezed by the roller. The tube pump 25 causes the water in the water supply tank 26 to flow to the steam generation device 70 and the water in the steam generation device 70 to flow to the water supply tank 26 depending on the driving direction of the rollers.

  The water supply tank 26 has a water supply tank body 41 and a communication pipe 42 and is accommodated in a tank cover 43. In the water supply tank 26, one end portion of the communication pipe 42 is disposed in the water supply tank main body 41, and the other end portion of the communication pipe 42 is connected to the water supply / drainage tube 40 via the tank joint portion 44. That is, the inside of the water supply tank main body 41 and the inside of the steam generator 24 communicate with each other through the communication pipe 42 and the like.

  FIG. 4 is a perspective view of the heating cooker of FIG. 1 with the top plate 1a and the back plate (not shown) covering the top surface and both side surfaces of the main body casing 1 removed, as viewed from the rear and obliquely upward.

  As shown in FIG. 4, an air supply unit 100 is provided on the rear side and the left side (right side in FIG. 4) of the heating chamber 2. The air supply unit 100 includes an air supply fan 54 disposed on the lower side, an air supply passage 101 extending upward from the air supply fan 54, and a branch from the upper side of the air supply passage 101. And a first cooling passage 102 extending toward the circulation fan motor 56 located in the upper center of the rear side of the chamber 2. That is, the air supply unit 100 extends upward from the air supply fan 54 so as to exhibit an inverted L shape.

  An exhaust unit 200 is provided on the rear side and the right side (left side in FIG. 4) of the heating chamber 2. The exhaust unit 200 includes a housing 210 including an exhaust unit cover 220 and an exhaust fan 47 disposed on the lower side of the housing 210. An exhaust damper motor 60 is disposed above the right side surface (the left side surface in FIG. 4) of the exhaust unit 200. An exhaust damper (not shown) provided in the upper part of the exhaust unit 200 is opened and closed by the exhaust damper motor 60.

  A concave portion 310 is provided at the left end (the right end in FIG. 4) of the upper surface portion 2e of the heating chamber 2. An infrared sensor unit 300 including the infrared sensor 77 is disposed in the recess 310. Moreover, the partition plate 312 extended in the front-back direction of a heating cooker is provided in the left side (right side in FIG. 4) of the infrared sensor unit 300. As shown in FIG.

  FIG. 5 is a control block diagram of the cooking device of FIG.

  As shown in FIG. 5, the cooking device includes a control device 80 including a microcomputer and an input / output circuit.

  The control device 80 includes an upper heater 20, an intermediate heater 21, a lower heater 22, a steam generation heater 73, a circulation fan motor 56, an exhaust fan motor 57, an air supply fan motor 58, a circulation damper motor 59, Exhaust damper motor 60, supply damper motor 61, cooling damper motor 62, infrared sensor motor 63, blower fan motor 64, operation unit 9, humidity sensor 53, internal temperature sensor 76, water level sensor 75, tube A pump 25, a magnetron 4, an infrared sensor 77, and the like are connected.

  Further, the control device 80 is based on signals from the operation unit 9, the humidity sensor 53, the internal temperature sensor 76, the water level sensor 75, the infrared sensor 303, etc., the upper heater 20, the middle heater 21, the lower heater 22, steam. Generation heater 73, circulation fan motor 56, exhaust fan motor 57, supply fan motor 58, circulation damper motor 59, exhaust damper motor 60, supply damper motor 61, cooling damper motor 62, infrared ray The object to be heated 15 is cooked by controlling the sensor motor 63, the fan fan motor 64, the tube pump 25, the magnetron 4, and the like.

  Next, the door 3 of the cooking device will be described in more detail with reference to FIGS.

  FIG. 6 is a front view of the door 3 of the cooking device of FIG.

  As shown in FIG. 6, the door 3 has a heat-resistant glass 7, a heat-resistant resin handle 8, and an operation unit 9 on the front surface 3 a.

  The heat-resistant glass 7 has a transparent inside confirmation window 7 a disposed in the center of the front surface 3 a of the door 3. The heat-resistant glass 7 includes a glass stopper 96 (shown in FIG. 12) provided at the upper portion of the front surface 3a of the door 3, and a locking portion 97 (shown in FIG. 12) provided at the lower end of the front surface 3a of the door 3. Is held by. In addition, the periphery of the inside confirmation window 7a is colored and opaque.

  The handle 8 has a substantially U shape and is disposed on the upper side of the heat-resistant glass 7 (see FIG. 2). The handle 8 has left and right connecting portions 8a and 8b (shown in FIG. 2) connected to a glass stopper 96, and is fixed to the front surface 3a of the door 3 via the glass stopper 96 (see FIG. 10). . The handle 8 and the glass stopper 96 (that is, the front surface 3a of the door 3) form a handle opening 8c that is a finger insertion space.

  The operation unit 9 is disposed on the right side of the heat-resistant glass 7 so as to overlap the opening 2a when the heating chamber 2 is closed by the door 3 (see FIG. 1). The operation unit 9 includes a substrate 91 (shown in FIG. 10) disposed inside the door 3, a color liquid crystal display unit 10 and a button group 11 provided on the substrate 91.

  The button group 11 includes an operation key 12 for setting a finishing temperature or a cooking menu, and a warm start key 13 for starting heating.

  FIG. 7 is a rear view of the door 3 of the cooking device of FIG. FIG. 8 is a right side view of the cooking device of FIG. FIG. 9 is a view for explaining a flow path inside the door 3.

  As shown in FIG. 9, an air flow path 92 for supplying and discharging external air to the back side of the substrate 91 of the operation unit 9 is formed inside the door 3. As shown in FIGS. 7 and 8, the air flow path 92 includes an air supply port 93 provided in the lower left portion of the rear surface 3 b of the door 3, and an exhaust port 94 provided in the upper portion of the right side surface of the door 3. have.

  A blower fan 95 is provided at an intermediate portion of the air flow path 92. The blower fan 95 is a centrifugal fan, and is provided on the back side of the substrate 91 of the operation unit 9 and is arranged so that a part of the blower fan 95 on the side of the air outlet 95b overlaps the color liquid crystal display unit 10 ( FIG. 11). That is, the blower fan 95 is disposed upstream of the color liquid crystal display unit 10 in the air flow path 92.

  Note that a ground pattern 91a is provided in a portion (indicated by a dotted line in FIG. 9) of the substrate 91 where the blower fan 95 is provided. Thereby, the malfunctioning of the operation part 9 by the noise of the ventilation fan 95 is prevented.

  10 is a cross-sectional view taken along line XX shown in FIG.

  As shown in FIG. 10, a cover 85 that covers the blower fan 95 is provided on the back side of the substrate 91. An air flow path 92 is formed by the cover 85 and the substrate 91. A partition plate 86 that divides the air flow path 92 in the front-rear direction of the door 3 is provided on the downstream side of the air flow fan 92 in the air flow path 92. The partition plate 86 forms two flow paths (first flow path 92 a and second flow path 92 b) stacked in the front-rear direction of the door 3 on the downstream side of the blower fan 95 in the air flow path 92. .

  The first flow path 92 a is formed on the front surface 3 a side of the door 3 from the partition plate 66, and the air blown from the blower outlet 95 b of the blower fan 95 flows along the back side of the substrate 91 and is exhausted from the exhaust port 94. It has come to be. The second flow path 92 b is formed on the rear surface 3 b side of the door 3 from the partition plate 66, and the air blown from the outlet 95 b of the blower fan 95 flows along the partition plate 86 and is exhausted from the exhaust port 94. It has become so. That is, the air flow path 92 includes two flow paths in which at least a part on the downstream side of the blower fan 95 is stacked in the front-rear direction of the door 3.

  FIG. 11 is a partially enlarged view of FIG.

  As shown in FIG. 11, the color liquid crystal display unit 10 is composed of a display glass 10a mounted on a substrate 91, liquid crystal substrates 10b and 10c, and a backlight 10d in order from the front surface 3a side of the door 3. Yes.

  Further, the second flow path 92b has a larger inlet than the first flow path 92a, and the air blown from the air outlet 95b of the blower fan 95 enters the second flow path 92b rather than the first flow path 92a. It is formed to flow in a lot.

  12 is a cross-sectional view taken along the line XII-XII shown in FIG.

  In addition, as shown in FIG. 12, an air layer forming unit 400 that forms a sealed air layer 401 is provided inside the door 3. The air layer forming portion 400 has a cylindrical shape with both ends closed, and is disposed on the upper side of the heat-resistant glass 7 and on the lower side of the glass stopper 96, and is connected to the left connecting portion 8a of the handle 8 (shown in FIG. 2). ) To the right connecting portion 8b (shown in FIG. 2). By providing the air layer 401 in this way, the heat conducted from the heating chamber 2 to the door 3 is blocked, and the heat conducted to the glass stopper 96 located on the upper side portion of the air layer 401 on the front surface 3a of the door 3 is conducted. Reduced. For this reason, the glass stopper 8b that may be touched by a hand or a finger when the handle 8 is gripped does not become hot, and the user is not uncomfortable.

  Next, the flow of air flowing through the air flow path 92 will be described with reference to FIGS.

  When the blower fan motor 64 (shown in FIG. 5) is controlled by the control device 80 (shown in FIG. 5) and the blower fan 95 is driven, as shown in FIGS. Air flows in, rises along the back side of the substrate 91, and is sucked into a suction port 95 a of a blower fan 95 provided in an intermediate portion of the air flow path 92.

  The external air sucked into the suction port 95a of the blower fan 95 is blown out from the blower outlet 95b of the blower fan 95, and flows into the first and second flow paths 92a and 92b as shown in FIG. The air flowing into the first flow path 92a flows along the back side of the substrate 91, passes through the back side of the portion of the substrate 91 where the color liquid crystal display unit 10 is disposed, and is exhausted from the exhaust port 94. The air flowing into the second flow path 92b flows along the first flow path 92a on the rear surface 3b side of the door 3 of the first flow path 92a and is exhausted from the exhaust port 94.

  At this time, the air blown out from the air outlet 95b of the blower fan 95 mainly flows into the second flow path 92b. That is, the second flow path 92b mainly functions as an air flow path for discharging the heat from the heating chamber 2 to the outside of the door 3, and the first flow path 92a blocks the heat conducted from the second flow path 92b. Functions as an air insulation layer.

  Thus, since the blower fan 95 is disposed in the middle portion of the air flow path 92 provided inside the door 3, the distance from the air supply port 93 to the blower fan 95 and the blower fan 95 to the exhaust port 94. The distance to is approximately equal. Thereby, since the pressure loss of the air flow which flows through a flow path is reduced, an operation part can be cooled efficiently and generation | occurrence | production of the malfunction by heat can be prevented.

  For example, since the exhaust port 94 of the air flow path 92 is provided above the air supply port 93, the heat conducted from the heating chamber 2 to the upper side of the door 3 can be efficiently discharged to the outside of the door 3. Thereby, especially the heat from the heating chamber 2 in which the upper region reaches a high temperature can be reliably cut off.

  Further, since the blower fan 95 is disposed in the middle portion of the air flow path 92 and upstream of the color liquid crystal display unit 10, the air blown from the blower outlet 95 b of the blower fan 95 is used as the color liquid crystal display unit of the substrate 91. It can supply to the back side of the part in which 10 is arrange | positioned. For this reason, it is possible to prevent the heat from the heating chamber 2 from being conducted to the color liquid crystal display unit 10 that is relatively weak to heat, and to suppress the temperature rise of the liquid crystal.

  In addition, since at least a part of the air flow path 92 on the downstream side of the blower fan 95 is configured by two first and second flow paths 92a and 92b stacked in the front-rear direction of the door 3, for example, heating By configuring the flow path on the rear surface 3b side of the door 3 close to the chamber 2 to function as a main air flow path, and the flow path on the front surface 3a side of the door 3 close to the operation unit 9 to function as an air heat insulation layer. The heat from the heating chamber 2 can be reliably cut off.

  In addition, since the board | substrate 91 of the operation part 9 can be efficiently cooled by arrange | positioning the ventilation fan 95 in the intermediate part of the air flow path 92 provided in the inside of the door 3 as mentioned above, for example, a ventilation fan Compared with the case where 95 is provided in the vicinity of the air supply port 93, a small blower fan 95 can be used. For this reason, the area of the inside confirmation window 7a of the heat-resistant glass 7 can be maximized.

  Further, when cooking is performed with superheated steam, condensation may occur inside the door 3. Since heat from the heating chamber 2 increases from the lower side of the door 3 toward the upper side, dew condensation is likely to occur on the lower side of the door 3 where the air supply port 93 is provided. If the blower fan 95 is provided near 93, the blower fan 95 must be waterproofed. However, in the heating cooker, since the blower fan 95 is provided in the middle portion of the air flow path 92, it is difficult to be affected by dew condensation and there is no need for waterproofing measures.

(Second Embodiment)
The cooking device of the second embodiment of the present invention is different from the first embodiment in which the operation inspection of the blower fan 95 inside the door 3 is performed during the manufacturing process of the product, that is, when it is attached to the back side of the substrate 91. This is different from the first embodiment in that it is performed in a completed state.

  In the heating cooker according to the second embodiment, an inspection apparatus mainly composed of a heating element and a thermistor is used. In this inspection device, the thermistor is always heated by the heating element. The inspection device in this state is brought close to the air supply port 93 to detect a temperature change (voltage change) of the thermistor. When the blower fan 95 is operating, the thermistor is cooled by the intake air of the blower fan 95 and its temperature is lowered. However, when the blower fan 95 is not operating, the temperature of the thermistor is not changed. That is, when the temperature of the thermistor decreases, it is determined that the blower fan 95 is operating normally.

  In this inspection method, since there is no electrical connection between the blower fan 95 and the inspection device, it is possible to inspect in the finished product state. Moreover, in the inspection method in which electrical connection is made, only the motor drive can be inspected. In other words, the case where the motor is driven but the blower fan 95 is not operating due to a malfunction cannot be detected. However, in the above inspection method, the operation of the blower fan 95 can be detected, so that the reliability of the product is improved. Can do.

(Third embodiment)
The cooking device according to the third embodiment of the present invention is different from the cooking device according to the first embodiment in that a plurality of output resistors are provided on the output side of the microcomputer of the control device 80.

  As shown in FIG. 13, the control device 80 for the heating cooker according to the third embodiment includes a microcomputer 81, a regulator 82 connected to the microcomputer 81, an input resistor R <b> 1 provided on the input side of the regulator 82, and a microcomputer A plurality of output resistors R2, R3, and R4 having different resistance values are connected to the output side of 81. In this control device 80, output resistors R2, R3, and R4 through which current flows are determined in advance so that the input current of the regulator 82 becomes constant according to the control state of the microcomputer 81. Since the input current of the regulator 82 fluctuates under the control of the microcomputer 81, output resistors R2, R3, and R4 through which current flows are determined in advance so that the input current of the regulator 82 becomes constant according to the control state of the microcomputer 81. By setting it, heat generation of the regulator 82 can be suppressed.

The regulator 82 is used to create a low voltage used by the microcomputer 81 or the like from a high voltage. However, the regulator 82 consumes power determined by the lowered voltage and the amount of current used by the microcomputer 81 or the like, causing heat generation. . For example, in the case of the control device 80 configured as shown in FIG. 13, if the amount of current used by the microcomputer 81 or the like is 50 mA, the power consumption of the regulator 82 is
(24V-3.3V) x 50mA = 1035mW
It becomes.

In order to suppress the heat generation of the regulator 82, there is a method of providing an input resistor R1 on the input side of the regulator 82. For example, when an input resistance R1 of 300Ω is provided, the power consumption of the regulator 82 is
(24V-3.3V- (300Ω × 50 mA)) × 50 mA = 285 mW
It becomes.

  However, since the amount of current used in the microcomputer 81 or the like varies depending on the operation of the circuit, when the input resistor R1 is provided, the amount of voltage drop due to the input resistor R1 varies due to the variation in the amount of current used in the microcomputer 81 or the like. 82 input current fluctuates. In particular, the regulator 82 tends to increase the power consumption when the input current decreases, so that the problem of heat generation of the regulator 82 remains even if the input resistor R1 is provided.

  In the control device 80 having the above-described configuration, a plurality of output resistors R2, R3, and R4 having different resistance values are provided on the output side of the microcomputer 81, and the output resistors R2 that flow the current amount so that the input current of the regulator 82 is constant. Since R3 and R4 are determined, heat generation of the regulator 82 can be suppressed with a simple configuration and low cost.

  Note that the output resistors R2, R3, and R4 through which the current flows are not limited to being determined in advance according to the control state of the microcomputer 81. For example, the output resistance voltage may be determined by measuring the voltage of the input resistance and determining the input current of the regulator to be constant from the measured voltage of the input resistance.

(Fourth embodiment)
In the heating cooker according to the fourth embodiment of the present invention, the position of the blower fan 95 only needs to be an intermediate portion of the air flow path 92, and the heat resistant temperature of the blower fan 95 to be used or the substrate 91 of the operation unit 9. It can be changed as appropriate according to the layout.

  The blower fan 95 is not limited to being provided on the substrate 91 of the operation unit 9, and may be provided on the cover 91, for example.

  If possible, the air supply port 93 and the exhaust port 94 of the air flow path 92 are not limited to the right side surface of the door 3 and can be provided at any position of the door.

  The present invention and the embodiments are summarized as follows.

The heating cooker of the present invention is
A body casing 1;
A heating chamber 2 disposed in the main casing 1 and having an opening 2a on the front side;
A door 3 for opening and closing the heating chamber 2;
With
The door 3 is
An operation unit 9 disposed on the front surface 3a so as to overlap the opening 2a when the heating chamber 2 is closed;
An air flow path 92 provided inside the door 3 for supplying and discharging external air to the back side of the operation unit 9;
A blower fan 95 disposed in an intermediate portion of the air flow path 92;
It is characterized by having.

  According to the heating cooker of the present invention, since the blower fan 95 is disposed in the middle portion of the air flow path 92 provided inside the door 3, the upstream air flow path 92 by the intake of the blower fan 95. And the downstream air flow path 92 by the exhaust of the ventilation fan 95 becomes substantially the same length. For this reason, the operation unit 9 can be efficiently cooled, and the occurrence of problems due to heat can be prevented.

In the heating cooker of one embodiment,
The operation unit 9 includes a liquid crystal display unit 10 to which external air is supplied to the back side through the air flow path 92.
The blower fan 95 is disposed upstream of the liquid crystal display unit 10 in the air flow path 92.

  According to the embodiment, since the blower fan 95 is disposed on the upstream side of the liquid crystal display unit 10, the air blown from the blower fan 95 can be supplied to the back side of the liquid crystal display unit 10. For this reason, the heat from the heating chamber 2 can be prevented from conducting to the liquid crystal display unit 10, and the temperature rise of the liquid crystal can be suppressed.

In the heating cooker of one embodiment,
At least a part of the air flow path 92 on the downstream side of the blower fan 95 includes two flow paths 92 a and 93 b stacked in the front-rear direction of the door 3.

  According to the above-described embodiment, at least a part of the air flow path 92 on the downstream side of the blower fan 95 is configured by the two flow paths 92a and 92b stacked in the front-rear direction of the door 3. By configuring the flow path on the rear surface 3b side of the door 3 close to the chamber 2 to function as a main air flow path, and the flow path on the front surface 3a side of the door 3 close to the operation unit 9 to function as an air heat insulation layer. The heat from the heating chamber 2 can be reliably cut off.

In the heating cooker of one embodiment,
The operation unit 9 has a substrate 91 on which the blower fan 95 is disposed on the back side,
A ground pattern 91 a is provided on a portion of the substrate 91 that faces the blower fan 95.

  According to the embodiment, malfunction of the operation unit 9 due to noise of the blower fan 95 can be prevented.

In the heating cooker of one embodiment,
The door 3 is
Heat-resistant glass 7 provided on the front surface 3a of the door 3,
An air layer forming part 400 provided above the heat-resistant glass 7 and forming a sealed air layer 401;
Have

  According to the embodiment, by providing the air layer 401, heat conducted from the heating chamber 2 to the door 3 can be cut off, and heat conducted to the upper portion of the front surface 3a of the door 3 from the air layer 401 can be reduced. .

In the heating cooker of one embodiment,
The door 3 is provided above the air layer 401 and has a handle 8 that forms a finger insertion space 8 c together with the front surface 3 a of the door 3.

  According to the above embodiment, since the handle 8 is provided above the air layer 401, when the handle 8 is gripped, a part above the air layer 401 on the front surface 3a of the door 3 that may be touched by a hand or a finger. Does not become hot and does not cause discomfort to the user

  Of course, the constituent elements described in the above embodiments may be combined as appropriate, and may be appropriately selected, replaced, or deleted.

DESCRIPTION OF SYMBOLS 1 Main body casing 1a Upper surface plate 2 Heating chamber 2a Opening part 2b Left side surface part 2c Right side surface part 2d Rear surface part 2e Upper surface part 2f Inclined surface part 3 Door 3a Front surface 3b Rear surface 4 Magnetron 5 Exhaust duct 6 Dew receptor 7 Heat-resistant glass 7a Confirmation window in a warehouse 8 Handle 8a Connection portion 8b Connection portion 8c Handle opening 9 Operation portion 10 Color liquid crystal display portion 11 Button group 12 Operation key 13 Start key 15 Heated object 16A, 16B Upper shelf receiver 17A, 17B Lower shelf receiver 18 Circulation duct 19 Circulation fan 20 Upper heater 21 Middle heater 22 Lower heater 23 Circulation damper 25 Tube pump 26 Water supply tank 27 Suction port 28 Upper outlet 29 First rear outlet 30 Second rear outlet 31 Third rear outlet 36 Steam pipe 37 Steam supply port 40 Water supply / drainage tube 41 Water supply tank body 42 Communication pipe 43 Tank cover 44 Tank joy Port 45 Natural exhaust port 46 First exhaust passage 47 Exhaust fan 48 Forced exhaust port 49 Exhaust damper 50 Inlet port 51 Inlet damper 52 Second exhaust passage 53 Humidity sensor 54 Inlet fan 56 Circulating fan motor 57 Exhaust fan Motor 58 Air supply fan motor 59 Circulation damper motor 60 Exhaust damper motor 61 Air supply damper motor 62 Cooling damper motor 63 Infrared sensor motor 64 Blower fan motor 70 Steam generation device 71 Steam generation container 71a Bottom portion 72 Lid Unit 73 Steam generating heater 75 Water level sensors 75a, 75b Electrode rod 76 Internal temperature sensor 77 Infrared sensor 80 Controller 81 Microcomputer 82 Regulator 85 Cover 86 Partition plate 91 Substrate 92 Air flow path 92a First flow path 92b Second flow path 93 Air supply port 94 Exhaust port 95 Blower fan 95a Suction port 5b outlet 96 glass stopper 97 locking portion 100 supply unit 101 supply passage 102 first cooling passage 200 exhaust unit 210 housing 220 exhaust unit cover 300 infrared sensor unit 310 recess 312 partition plate 400 air layer forming unit 401 air layer

Claims (6)

A body casing;
A heating chamber disposed within the main casing and having an opening on the front side;
A door for opening and closing the heating chamber;
With
The door
An operation unit arranged on the front surface so as to overlap the opening when the heating chamber is closed;
An air flow path provided inside the door for supplying and discharging external air to the back side of the operation unit;
A blower fan disposed in an intermediate portion of the air flow path;
A cooking device characterized by comprising: The heating cooker according to claim 1, wherein
The operation unit has a liquid crystal display unit to which external air is supplied to the back side through the air flow path,
The heating cooker, wherein the blower fan is disposed upstream of the liquid crystal display unit in the air flow path. The heating cooker according to claim 1 or 2,
At least a part of the air flow path on the downstream side of the blower fan is configured by two flow paths stacked in the front-rear direction of the door. In the heating cooker according to any one of claims 1 to 3,
The operation unit has a substrate on which the blower fan is arranged on the back side,
A cooking device, wherein a ground pattern is provided on a portion of the substrate corresponding to the blower fan. In the heating cooker according to any one of claims 1 to 4,
The door
Heat-resistant glass provided in front of the door;
An air layer forming part that is provided above the heat resistant glass and forms a sealed air layer;
A cooking device characterized by comprising: The cooking device according to claim 5,
The heating cooker, wherein the door is provided above the air layer, and has a handle that forms a finger insertion space together with the front surface of the door.

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