JP2011112328A - Cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooker capable of easily detecting at a start of heating cooking that a heating object that becomes a load is not inside a heating chamber by a simple structure. <P>SOLUTION: This cooker includes the heating chamber disposed in a casing, an exhaust passage for guiding exhaust from inside the heating chamber to the outside, a cooling fan 16 disposed inside the casing for feeding a portion of air into the exhaust passage, an interior temperature sensor 71 for detecting the atmospheric temperature inside the heating chamber, and an exhaust duct temperature sensor 70 for detecting the atmospheric temperature inside the exhaust passage. Whether or not the cooker is in a non-load state in which there is no heating object in the heating chamber is determined by a non-load determining part 100b, at the start of cooking in a state of the cooling fan 16 being stopped by a fan control part 100a, based on the atmospheric temperature inside the heating chamber detected by the interior temperature sensor 71 and the atmospheric temperature in the exhaust passage detected by the exhaust duct temperature sensor 70. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cooking device.

  Conventionally, as a cooking device, there is one that determines the amount of an object to be heated based on the amount of water vapor in a warehouse detected by a gas sensor and the shape of the object to be heated detected by a shape sensor (for example, JP, 6-229558, A (patent documents 1) reference). In the heating cooker, it is possible to accurately determine the amount of the object to be heated using the gas sensor and the shape sensor, and to perform favorable cooking control.

  However, in the above cooking device, the gas sensor for detecting water vapor and the shape sensor for detecting the shape of the object to be heated are complicated and costly. Therefore, the amount and presence of the object to be heated are detected. Most cookers do not have a function to do.

  For this reason, in a heating cooker that does not have the function of detecting the presence or absence of the object to be heated, if the object to be heated is not in the heating chamber at the start of cooking, the internal temperature rises too much due to no-load heating, and the heating chamber Internal paint surfaces and interior parts are damaged, or unnecessary power is consumed from the start of cooking until the temperature inside the cabinet rises abnormally and stops. Therefore, it is desired to provide a heating cooker at a low cost with a function of detecting whether or not an object to be heated that is a load at the start of cooking is in the heating chamber.

Japanese Patent Laid-Open No. 6-229558

  Then, the subject of this invention is providing the heating cooker which can detect easily that the to-be-heated material used as load at the time of the start of heating cooking is not in a heating chamber with simple structure.

In order to solve the above problems, the heating cooker of the present invention is:
A casing,
A heating chamber disposed in the casing;
An exhaust path for guiding the exhaust from the heating chamber to the outside;
A fan that is arranged in the casing and sends part or all of the wind into the exhaust path;
An internal temperature sensor for detecting the temperature of the atmosphere in the heating chamber;
An exhaust temperature sensor that is disposed in the exhaust path and detects the temperature of the atmosphere in the exhaust path;
A fan control unit for controlling the fan;
At the start of cooking, with the fan stopped by the fan control unit, the temperature of the atmosphere in the heating chamber detected by the internal temperature sensor and the exhaust path detected by the exhaust temperature sensor And a no-load determination unit that determines whether there is no object to be heated in the heating chamber based on the temperature of the atmosphere.

  According to the above configuration, at the start of cooking, the amount of increase in the temperature of the atmosphere in the heating chamber becomes smaller as the object to be heated in the heating chamber becomes larger while the fan is stopped by the fan control unit. The smaller the object to be heated is, the larger it is. And the unloading state without the to-be-heated object in a heating chamber has the largest raise amount of the temperature of the atmosphere in a heating chamber. In addition, at the start of cooking, with the fan controlled by the fan control unit, the larger the heated object in the heating chamber, the more steam is released from the heated object, and the exhaust from the heating chamber is externally discharged. The amount of increase in the temperature of the atmosphere in the exhaust path that guides the air increases. On the other hand, the smaller the object to be heated in the heating chamber, the smaller the amount of steam released from the object to be heated, and the smaller the increase in the temperature of the atmosphere in the exhaust path. In the no-load state where there is no object to be heated in the heating chamber, no steam is generated and the exhaust path is not exhausted, so there is almost no change in the temperature of the atmosphere in the exhaust path. Using the temperature characteristics of the atmosphere in the heating chamber and the temperature characteristics of the atmosphere in the exhaust path, the temperature of the atmosphere in the heating chamber detected by the temperature sensor in the chamber and the exhaust detected by the exhaust temperature sensor. Based on the temperature of the atmosphere in the path, the no-load determination unit can determine whether or not there is no object to be heated in the heating chamber. Therefore, it can be easily detected that there is no object to be heated in the heating chamber as a load at the start of cooking with a simple configuration.

Moreover, in the heating cooker of one embodiment,
In the state where the fan control unit stops the fan, the no-load determination unit has an increase amount per unit time of the temperature of the atmosphere in the heating chamber detected by the internal temperature sensor equal to or higher than a first threshold value. And when the amount of increase in the temperature of the atmosphere in the exhaust path detected by the exhaust temperature sensor per unit time is less than a second threshold value, there is no object to be heated in the heating chamber. It is determined that

  According to the above embodiment, when the fan control unit stops the fan and the increase amount per unit time of the temperature of the atmosphere in the heating chamber detected by the chamber temperature sensor is equal to or higher than the first threshold value, In addition, when the amount of increase in the temperature of the atmosphere in the exhaust path detected by the exhaust temperature sensor per unit time is less than the second threshold, the no-load determination unit is in the no-load state where there is no object to be heated in the heating chamber. Is determined. Thereby, it can be easily detected by simple condition determination that there is no object to be heated in the heating chamber at the start of cooking.

Moreover, in the heating cooker of one embodiment,
A steam generator disposed in the casing and generating steam to be supplied to the heating chamber;
A steam generation control unit for controlling the steam generator,
The steam generation control unit uses the steam generator to determine whether or not there is no object to be heated in the heating chamber by the no-load determination unit at the start of cooking using steam. Steam generation is stopped for a predetermined time from the start of the cooking.

  According to the above-described embodiment, at the start of cooking using steam, the steam generation control unit determines whether or not the unloaded determination unit determines whether there is no object to be heated in the heating chamber. By stopping the steam generation by the generator for a predetermined time from the start of cooking, the steam supplied from the steam generator to the heating chamber is discharged to the exhaust path, and the temperature of the atmosphere in the exhaust path rises. It can be prevented that the no-load determination by the load determination unit cannot be performed correctly.

Moreover, in the heating cooker of one embodiment,
A power shut-off unit that shuts off power input to the main unit
If the no-load determination unit determines that there is no object to be heated in the heating chamber after the start of cooking, the power cut-off unit cuts off the power input to the main body.

  According to the above embodiment, after the start of cooking, when the no-load determination unit determines that there is no object to be heated in the heating chamber, the power cutoff unit shuts off the power input to the main body. In addition, it is possible to prevent an abnormal increase in the internal temperature due to no-load heating and to save energy.

Moreover, in the heating cooker of one embodiment,
With a display,
If the said no-load determination part determines that it is the no-load state which does not have a to-be-heated object in the said heating chamber after the start of cooking, the said display part will be in the no-load state which has no to-be-heated object in the said heating chamber. Display that there is.

  According to the above embodiment, if the no-load determination unit determines that there is no object to be heated in the heating chamber after the start of cooking, the display unit indicates that there is no object to be heated in the heating chamber. Since the load status is displayed, the user can know that there is no object to be heated in the heating chamber, and can stop cooking or put a new object in the heating chamber. , Can respond quickly when there is no load.

  As is clear from the above, according to the cooking device of the present invention, a cooking device that can easily detect that there is no object to be heated in the heating chamber at the start of cooking with a simple configuration is realized. be able to.

FIG. 1 is a front view of a heating cooker according to an embodiment of the present invention. FIG. 2A is a perspective view of the heating cooker from which the top and both sides of the casing are removed, as viewed obliquely from the upper front. FIG. 2B is a perspective view of the cooking device with the handle door open. FIG. 3 is a perspective view of the cooking device as seen from the rear and obliquely above. FIG. 4 is a side view of the cooking device as seen from the right side. FIG. 5 is a sectional view taken along line VV in FIG. 2A. FIG. 6 is a schematic diagram of an enlarged cross section of the main part of the heating cooker viewed from the side. FIG. 7A is a top view of the exhaust duct. FIG. 7B is a sectional view taken along line VIIB-VIIB in FIG. 7A. FIG. 8 is a plan view of the dew receiver. 9 is a cross-sectional view taken along line IX-IX in FIG. FIG. 10 is a control block diagram of the cooking device. FIG. 11 is a diagram showing rising characteristics of the internal temperature of the heating cooker.

  Hereinafter, the cooking device of the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a front view of a heating cooker according to an embodiment of the present invention.

  The heating cooker includes a casing 1 and a sliding door 2 with a handle that is attached to the front side of the casing 1. An operation panel 3 is provided on the front side of the casing 1 so as to be adjacent to the door 2 with a handle when closed. A dew receiving device 4 is arranged below the door 2 with handle and the operation panel 3.

  A substantially cylindrical dial 5 is rotatably attached to the operation panel 3. Further, the operation panel 3 has a liquid crystal display unit 7, and the liquid crystal display unit 7 performs display according to the operation of the dial 5.

  The dew receptacle 4 is a container that can be attached to and detached from the two front legs 6, 6 provided on the front side of the bottom of the casing 1. When the dew receptacle 4 is inserted into the lower side of the casing 1 from the front to the rear and attached to the front legs 6, 6, a part of the dew receptacle 4 is the rear surface (rear surface) of the door 2 with the handle when closed. Located below. Thereby, when the door 2 with a handle is opened, the dew condensation water adhering to the rear surface of the door 2 with the handle is dripped into the dew receiver 4.

  FIG. 2A shows a perspective view of the heating cooker from which the top and both sides of the casing 1 have been removed as seen from the front obliquely upward, and FIG. 2B shows a perspective view of the heating cooker with the handle door 2 open. The figure is shown. Moreover, FIG. 3 is the perspective view which looked at the heating cooker of FIG. 2A from back diagonally upward. In FIG. 2A, FIG. 2B, and FIG. 3, the same reference numerals are assigned to the same components.

  In the casing 1, as shown in FIGS. 2A, 2B, and 3, a heating chamber 8 for heating the cooking object is installed (see FIG. 2B). In the casing 1, an electrical component chamber 9 is provided as an example of a cooling space at the side of the heating chamber 8 and behind the operation panel 3, and the intake space 10 is disposed behind the heating chamber 8 and behind the electrical component chamber 9. Provided. Further, heat shield plates 11, 11,... Are arranged above, below, behind and on both sides of the heating chamber 8. That is, the heat shield plates 11, 11,... Are arranged around the heating chamber 8 except for the opening 8 a. A space between the heat shield plate 11 and the heating chamber 8 is filled with a heat insulating material (not shown).

  Moreover, the heating chamber 8 has an opening 8a (shown in FIG. 2B) on the front side, and the door 2 with a handle slides back and forth by a pair of rail units 31 to open and close the opening 8a. The rail unit 31 includes a movable rail having one end fixed to the door 2 with a handle, and a fixed rail that is fixed to the casing 1 and supports the movable rail in a slidable manner. Further, the tray 32 is pulled out together with the door 2 with a handle. By opening and closing the door with handle 2, the food to be cooked placed on the tray 32 is taken out from the heating chamber 8 or put into the heating chamber 8.

  Below the tray 32 is a tray holder 33 that detachably holds the tray 32. The tray holder 33 is formed by bending a metal wire into a predetermined shape. And the front-end part of the tray holder 33 is attached to the rear surface of the door 2 with a handle so that attachment or detachment is possible. Thereby, the tray 32 can move in the front-rear direction together with the door 2 with the handle.

  The rail units 31 are connected to each other by a plate-like member 34. The plate-like member 34 faces the lower heater storage portion 27 in a state where the tray 32 is placed in the heating chamber 8, that is, in a state where the opening 8 a of the heating chamber 8 is closed.

  In the electrical component chamber 9, a steam generator 13 that generates steam to be supplied to the heating chamber 8, a water supply pump 14 connected to the steam generator 13 via a water supply tube 20, and the water pump 14 There is a tank storage portion 15 arranged in front of the tank. When the cooking object is heated, cooling air from the cooling fan 16 flows through the electrical component chamber 9 so that electrical components such as the water supply pump 14 can be cooled.

  As the cooling fan 16 is driven, air outside the casing 1 flows into the intake space 10 from the four intake ports 17, 17, 17, 17. The air in the intake space 10 is sent into the electrical component chamber 9 by the cooling fan 16. Each intake port 17 includes a plurality of slits provided at the rear portion of the casing 1.

  The upstream end of the exhaust tube 18 is connected to an exhaust port provided at the rear portion of the heating chamber 8 via a catalyst unit (not shown) installed above the rear portion of the heating chamber 8. The downstream end (exhaust port) of the exhaust tube 18 is connected to a synthetic resin exhaust duct 19 disposed on the side of the tank housing 15. The exhaust tube 18 is made of a synthetic resin having flexibility, and is installed from the upper rear side to the lower front side of the electrical component chamber 9.

  And the gas in the heating chamber 8 is guided from the rear part of the casing 1 to the front side by the exhaust tube 18 and the exhaust duct 19 so as to go out of the casing 1.

  2A, 2 </ b> B, and 3, reference numeral 21 denotes a partition wall that partitions the electrical component chamber 9 and the intake space 10. A cooling fan 16 is attached to the partition wall 21. Further, as shown in FIG. 3, the upper heater storage portion 25 is disposed above the heating chamber 8, and the upper heater 26 is disposed in the upper heater storage portion 25. The upper heater housing 25 and the upper heater 26 constitute a steam temperature raising device.

  FIG. 4 is a side view of the cooking device of FIG. 2A as viewed from the right side.

  The tank storage unit 15 stores a water supply tank 23. When the door 2 with handle is opened, the front surface of the water supply tank 23 is exposed and can be taken in and out of the tank storage portion 15 (see FIG. 2B). Further, the water in the water supply tank 23 is supplied to the steam generator 13 through the water supply tube 20 by driving the water supply pump 14. The steam generator 13 heats the water from the feed water pump 14 with a steam generating heater 24 to generate water vapor.

  FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. Note that in FIG. 5, illustration of some of the members and devices in the casing 1 is omitted.

  As shown in FIG. 5, while providing the upper heater accommodating part 25 which heats the inside of the heating chamber 8 from the upper side above the heating chamber 8, the inside of the heating chamber 8 is heated from the lower side below the heating chamber 8. For this purpose, a lower heater storage 27 is provided.

  An upper heater 26 made of, for example, a sheathed heater is accommodated in the upper heater accommodating portion 25. The saturated water vapor generated by the steam generator 13 is blown into the upper heater housing 25 and heated by the upper heater 26 to become superheated water vapor. The superheated steam is jetted downward into the heating chamber 8 from a plurality of steam outlets 111 provided on the top panel 110 of the heating chamber 8 to heat the objects to be heated on the tray 32. Further, when the saturated steam from the steam generator 13 is not heated by the upper heater 26, the saturated steam heats the object to be heated. Further, the object to be heated can be heated by the radiant heat of the upper heater 26. Here, the superheated steam means steam heated to a superheated state of 100 ° C. or higher.

  The top panel 110 functions as a partition wall that separates the space in the upper heater housing 25 and the space in the heating chamber 8 and is heated by the upper heater 26 to radiate heat to an object to be heated in the heating chamber 8. It also functions as a radiation plate for irradiation.

  A lower heater 28 made of, for example, a sheathed heater is accommodated in the lower heater accommodating portion 27. The lower heater 28 is completely covered with the bottom panel 120 of the heating chamber 8 and is not exposed to the space in the heating chamber 8. Thus, even when oil or the like coming out of the object to be heated drops, the oil or the like does not adhere to the lower heater 28 to prevent smoke and fire due to the adhesion, and the lower heater 28 It can be prevented from getting dirty.

  Further, the bottom panel 120 functions as a partition wall that separates the space in the lower heater housing portion 27 from the space in the heating chamber 8 and is heated by the lower heater 28 to irradiate the object to be heated in the heating chamber 8 with radiant heat. It also functions as a radiation plate.

  The rail units 31 and 31 are connected to each other by a plate-like member 34. The plate-like member 34 faces the lower heater storage portion 27 in a state where the tray 32 is placed in the heating chamber 8, that is, in a state where the opening 8 a of the heating chamber 8 is closed by the door 2 with a handle.

  Moreover, FIG. 6 has shown the schematic diagram of the expanded cross section of the principal part which looked at the said heating cooker from the side. As shown in FIG. 6, a discharge port 22 is provided at the bottom of the front side of the exhaust duct 19. The discharge port 22 passes through the bottom of the casing 1 and faces the dew receiver 4. Moreover, the nozzle part 61 to which the downstream end of the exhaust tube 18 is connected is contained in the exhaust duct 19, and the opening 61a at the tip of the nozzle part 61 faces the discharge port 22 side. The exhaust tube 18, the nozzle part 61 and the exhaust duct 19 constitute an exhaust path.

  7A shows the top surface of the exhaust duct 19, and FIG. 7B shows a cross-sectional view of the exhaust duct 19 as seen from the line VIIB-VIIB in FIG. 7A.

  As shown in FIGS. 7A and 7B, the exhaust duct 19 has a tapered shape from the blowing port 60 toward the discharging port 22, and the upper wall 19 a except the upper wall 19 a, the lower wall 19 b, and the blowing port 60. Side wall 19c provided so as to surround between the outer edge of the lower wall 19b and the outer edge of the lower wall 19b, a cylinder part 19d protruding downward from the outer periphery of the discharge port 22, and provided so as to protrude forward from the vicinity of the cylinder part 19d. The first fixing portion 19e and the second fixing portion 19f provided in the vicinity of the lower edge of the blowing port 60 of the lower wall 19b are provided. Further, the exhaust duct 19 is formed with a notch 19g at the upper edge of the air inlet 60 of the upper wall 19a.

  A substantially L-shaped nozzle portion 61 is attached to the notch 19g of the exhaust duct 19 from the blow port 60 side. And the nozzle part 61 is being fixed to the upper wall 19a of the exhaust duct 19 using the attachment flange 62 fixed to the upper end of the nozzle part 61. FIG. The downstream end of the exhaust tube 18 is connected to the upper end of the nozzle portion 61.

  In the exhaust duct 19, the cylinder portion 19d of the exhaust duct 19 is inserted into a hole 65a provided in the bottom plate 65, and the exhaust duct 19 is screwed (not shown) using a first fixing portion 19e and a second fixing portion 19f. Is fixed to the bottom plate 65. At this time, the upper surface of the lower wall 19b of the exhaust duct 19 is inclined so as to become lower toward the front with respect to the plane of the bottom plate 65. In this embodiment, the angle formed between the upper surface of the lower wall 19b of the exhaust duct 19 and the plane of the bottom plate 65 is set to 2 to 3 degrees. Thereby, the water in the exhaust duct 19 flows to the discharge port 22 side and falls, and does not flow out from the blow port 60 side.

  The exhaust duct 19 is tapered from the upstream inlet 60 toward the downstream outlet 22. With this tapered shape, the air flow in the exhaust duct 19 is made smooth, and the exhaust from the opening 61a at the tip of the nozzle portion 61 is drawn and guided to the discharge port 22 side.

  Further, as shown in FIGS. 7A and 7B, an opening 61a of the nozzle portion 61 is disposed in the wind path between the upstream inlet 60 and the downstream outlet 22 of the exhaust duct 19, and an exhaust temperature sensor. As an example, by disposing the exhaust duct temperature sensor 70 upstream of the opening 61a of the nozzle portion 61 in the exhaust duct 19, the high-temperature exhaust gas flowing from the opening 61a of the nozzle portion 61 when the cooling fan 16 is stopped. Moves to the upstream side of the opening 61a of the nozzle portion 61 in the exhaust duct 19, and the exhaust duct temperature sensor 70 detects high-temperature exhaust.

  FIG. 8 shows a plan view of the dew receiver 4 and FIG. 9 shows a cross-sectional view taken along line IX-IX in FIG. As shown in FIGS. 8 and 9, the dew receptacle 4 includes a horizontally elongated first dew receiving recess 41 and a second dew provided with a rib 42 in front of the first dew receiving recess 41. It has a receiving recess 43. Fitting recesses 45A and 45B that open on the rear surface side (upper side in FIG. 8) are provided at both ends of the first dew receiving recess 41, respectively, and curved arm portions 46A extending toward the rear surface in the fitting recesses 45A and 45B. , 46B are provided. Guide portions 47A and 47B are provided on the first dew receiving recess 41 side in the fitting recesses 45A and 45B, respectively.

  When the dew receptacle 4 is attached to the two front legs 6, 6 provided on the front side of the bottom of the casing 1, the fitting protrusions (not shown) of the front legs 6, 6 are the guide portions 47 </ b> A of the dew receptacle 4. , 47B, while being guided by the fitting recesses 45A, 45B. At this time, the curved arm portions 46A and 46B of the dew receiving device 4 are elastically deformed so that the fitting convex portions (not shown) of the front legs 6 and 6 are sandwiched in cooperation with the guide portions 47A and 47B. The container 4 is held on the front legs 6 and 6.

  A region S on the right side of the bottom surface of the first dew receiving recess 41 of the dew receiving device 4 faces the opening of the discharge port 22 of the upper exhaust duct 19. The exhaust from the discharge port 22 of the exhaust duct 19 is received in the region S of the first dew receiving recess 41 of the lower dew receiving device 4 and diffused outside the casing 1. At this time, the exhaust gas flows from the inside of the first dew receiving recess 41 of the dew receiving device 4 to the front side of the casing 1 from the gap between the dew receiving device 4 and the door 2 with handle and the gap between the dew receiving device 4 and the casing 1. It spreads over a wide external space.

  In addition, water drops dripping from the discharge port 22 of the exhaust duct 19 are received by the first dew receiving recess 41 of the dew receiver 4, and water drops falling along the rear surface of the door 2 with handle and the front surface of the casing 1 are received by the dew receiver. 4 first dew receiving recesses 41 and second dew receiving recesses 43.

  FIG. 10 shows a control block diagram of the cooking device. As shown in FIG. 10, the cooking device includes a control device 100 including a microcomputer and an input / output circuit. Based on the operation input signal from the operation panel 3 and the detection signals from the exhaust duct temperature sensor 70 and the internal temperature sensor 71, the control device 100 controls the liquid crystal display unit 7, the water supply pump 14, the cooling fan 16, and the steam generating heater 24. The upper heater 26 and the lower heater 28 are controlled.

  In addition, the control device 100 includes a fan control unit 100a that controls the cooling fan 16, a no-load determination unit 100b that determines whether or not there is no object to be heated in the heating chamber 8 at the start of cooking, It has the steam generation control part 100c which controls the steam generator 13, and the power-supply-cut-off part 100d which interrupts | blocks the power input to a main body.

  In the cooking device having the above configuration, with the door 2 with handle pulled out as shown in FIG. 2B, the water supply tank 23 containing the required amount of water is stored in the tank storage unit 15 and the door 2 with handle is closed. After that, the operation panel 3 is operated to start cooking using steam. Then, the upper heater 26 and the lower heater 28 arranged above and below the heating chamber 8 are turned on, and the water supply pump 14 is driven to supply water in the water supply tank 23 to the steam generator 13. The water supplied to is heated by the steam generating heater 24 to generate water vapor. And the water vapor | steam generate | occur | produced in the steam generation apparatus 13 blows off in the upper heater accommodating part 25 of the upper side of the heating chamber 8, is heated by the upper heater 26, and becomes 100 degreeC or more superheated steam. The superheated steam is supplied into the heating chamber 8 through a plurality of steam outlets 111 provided on the top panel 110 of the heating chamber 8. As a result, the food placed on the tray 32 in the heating chamber 8 is radiated from the top panel 110 of the heating chamber 8, the radiant heat from the bottom panel 120, and a plurality of steam outlets of the top panel 110. It is cooked by superheated steam at 100 ° C. or more blown out from 111. At this time, the superheated steam supplied and adhered to the food surface condenses on the food surface and gives a large amount of latent heat of condensation to the food, so that heat can be efficiently transmitted to the food.

  In this heating cooker, oven cooking using only the upper heater 26 and the lower heater 28 may be performed without using steam, or steam generated by the steam generator 13 without using the upper heater 26 and the lower heater 28. Steamed dishes using only bean may be performed.

  FIG. 11 shows rising characteristics of the inside temperature of the cooking device. In FIG. 11, the horizontal axis represents the time [minute] from the start of cooking, and the vertical axis represents the internal temperature (temperature in the heating chamber 8) [° C.]. Further, the thin solid line in FIG. 11 shows the rising temperature characteristic of the internal temperature when the load is large, the thick solid line shows the rising temperature characteristic of the internal temperature when the load is small, and the dotted line indicates no load with no object to be heated. The rise temperature characteristic at the time of is shown.

  As shown in FIG. 11, the amount of increase in the temperature of the atmosphere in the heating chamber 8 is large for the object to be heated in the heating chamber 8 with the cooling fan 16 stopped by the fan control unit 100a at the start of cooking. On the other hand, the smaller the material to be heated in the heating chamber 8, the larger the material. And the no-load state in which there is no to-be-heated object in the heating chamber 8 has the largest raise amount of the temperature of the atmosphere in the heating chamber 8. Moreover, in the state which stopped the cooling fan 16 by the fan control part 100a at the time of the start of cooking, the vapor | steam discharge | released from a to-be-heated object increases, so that the to-be-heated object in the heating chamber 8 is large, and the inside of the heating chamber 8 The amount of increase in the temperature of the atmosphere in the exhaust path (18, 61, 19) for guiding the exhaust from the outside to the outside increases. On the other hand, the smaller the object to be heated in the heating chamber 8, the smaller the amount of steam released from the object to be heated, and the smaller the increase in the temperature of the atmosphere in the exhaust path. In the unloaded state where there is no object to be heated in the heating chamber 8, no steam is generated and the exhaust path is not exhausted, so there is almost no change in the atmosphere temperature in the exhaust path.

  Using the temperature characteristics of the atmosphere in the heating chamber 8 and the temperature characteristics of the atmosphere in the exhaust path (18, 61, 19), the temperature of the atmosphere in the heating chamber 8 detected by the chamber temperature sensor 71 is used. Based on the temperature of the atmosphere in the exhaust duct 19 (a part of the exhaust path) detected by the exhaust duct temperature sensor 70, the no-load determination unit 100b determines whether there is no object to be heated in the heating chamber 8 or not. It becomes possible to determine. Therefore, it can be easily detected that there is no object to be heated in the heating chamber 8 as a load at the start of cooking with a simple configuration.

  In addition, when the cooling fan 16 is stopped by the fan controller 100a, the amount of increase per unit time (for example, 10 seconds) of the temperature of the atmosphere in the heating chamber 8 detected by the internal temperature sensor is the first threshold (for example, 20 ° C.) or more, and the amount of increase per unit time (for example, 10 seconds) of the temperature of the atmosphere in the exhaust path (18, 61, 19) detected by the exhaust duct temperature sensor 70 is the second threshold value. When it is less than (for example, 3 ° C.), the no-load determination unit 100b determines that there is no object to be heated in the heating chamber 8. Thereby, it can be easily detected by simple condition determination that there is no object to be heated in the heating chamber 8 at the start of cooking.

  In addition, at the start of cooking using steam, the steam generation control unit 100c determines whether or not there is no object to be heated in the heating chamber 8 by the no-load determination unit 100b. Is stopped for a predetermined time from the start of cooking, whereby the steam supplied from the steam generator 13 to the heating chamber 8 is discharged to the exhaust path (18, 61, 19) and the temperature of the atmosphere in the exhaust path Can be prevented from becoming uncorrectable by the no-load determination unit 100b.

  When the no-load determination unit 100b determines that there is no object to be heated in the heating chamber 8 after the start of cooking, the power cut-off unit 100d shuts off the power input to the main body. While preventing abnormal rise of the internal temperature due to load heating, energy saving can be achieved. The power shut-off unit 100d may shut off the power input to the heating means including the upper heater 26 and the lower heater 28 instead of shutting off the power input to the main body.

  Moreover, if the no-load determination part 100b determines that it is the no-load state in which the to-be-heated object does not exist in the heating chamber 8 after the start of cooking, the no-load to which there is no to-be-heated object in the heating chamber 8 by the control apparatus 100 Since the state is displayed on the liquid crystal display unit 7, the user knows that there is no object to be heated in the heating chamber 8, and stops cooking or newly adds the object to be heated in the heating chamber 8. It can be put in and can respond quickly when there is no load.

  In the above embodiment, the exhaust duct temperature sensor 70 as the exhaust temperature sensor is disposed in the exhaust duct 19, but this is not limiting, and the temperature of the atmosphere in the exhaust path is detected according to the configuration of the exhaust path. An exhaust temperature sensor may be disposed at an appropriate exhaust path.

  Moreover, although the said embodiment demonstrated the heating cooker using the exhaust path comprised by the exhaust tube 18, the nozzle part 61, and the exhaust duct 19, an exhaust path is not restricted to this, Exhaust from the inside of a heating chamber is carried out. What is necessary is just to guide outside, for example, the exhaust path which exhausts from an upper exhaust port via the duct extended upwards from the back side of a heating chamber may be sufficient.

  Moreover, although the said embodiment demonstrated the heating cooker using the cooling fan 16 as a fan which sends a part of wind to an exhaust path, the fan which sends a part or all of a wind to an exhaust path is not restricted to this, For example, the present invention may be applied to a heating cooker using an exhaust fan that sends air to the exhaust path.

  In the above embodiment, the cooking device using the dew receptacle 4 as the exhaust receiver has been described. However, the exhaust receiver is not limited to this, and may be a member other than the dew acceptor. What is necessary is just to receive the exhaust from a mouth and to diffuse it out of a casing.

  Moreover, in the said embodiment, although the opening part 8a of the heating chamber 8 was opened and closed by the door 2 with a handle which slides in the front-back direction with respect to the casing 1, for example, the opening portion of the heating chamber is formed by a pivotable opening / closing door. May be opened and closed. That is, the open / close door provided in the cooking device of the present invention may be a sliding type or a rotating type.

  Examples of the cooking device according to the present invention include not only an oven range using superheated steam but also an oven using superheated steam, an oven range not using superheated steam, and an oven not using superheated steam.

  In the cooking device of the present invention, healthy cooking can be performed by using superheated steam or saturated steam in a microwave oven or the like. For example, in the cooking device of the present invention, superheated steam or saturated steam having a temperature of 100 ° C. or higher is supplied to the food surface, and the superheated steam or saturated steam adhered to the food surface is condensed to give a large amount of condensation latent heat to the food. So it can efficiently transfer heat to food. Moreover, when condensed water adheres to the food surface and salt and oil are dropped together with condensed water, salt and oil in the food can be reduced. Further, the inside of the heating chamber is filled with superheated steam or saturated steam, and becomes anoxic state, thereby enabling cooking while suppressing oxidation of food.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Door with a handle 3 ... Operation panel 4 ... Dew receptacle 5 ... Dial 6, 6 ... Front leg 7 ... Liquid crystal display part 8 ... Heating chamber 9 ... Electrical component room 10 ... Intake space 11, 11 ... Heat shield DESCRIPTION OF SYMBOLS 13 ... Steam generator 14 ... Water supply pump 15 ... Tank storage part 16 ... Cooling fan 17 ... Intake port 18 ... Exhaust tube 19 ... Exhaust duct 20 ... Water supply tube 21 ... Partition wall 22 ... Discharge port 23 ... Supply water tank 24 ... Steam generation Heater 25 ... upper heater storage unit 26 ... upper heater 27 ... lower heater storage unit 28 ... lower heater 31 ... rail unit 32 ... tray 33 ... tray holder 34 ... plate member 70 ... exhaust duct temperature sensor 71 ... inside chamber temperature sensor DESCRIPTION OF SYMBOLS 100 ... Control apparatus 100a ... Fan control part 100b ... No-load determination part 100c ... Steam generation control part 100d ... Power supply cutoff part 110 ... Top panel 11 ... steam outlet 120 ... bottom panel

Claims (5)

A casing,
A heating chamber disposed in the casing;
An exhaust path for guiding the exhaust from the heating chamber to the outside;
A fan that is arranged in the casing and sends part or all of the wind into the exhaust path;
An internal temperature sensor for detecting the temperature of the atmosphere in the heating chamber;
An exhaust temperature sensor that is disposed in the exhaust path and detects the temperature of the atmosphere in the exhaust path;
A fan control unit for controlling the fan;
At the start of cooking, with the fan stopped by the fan control unit, the temperature of the atmosphere in the heating chamber detected by the internal temperature sensor and the exhaust path detected by the exhaust temperature sensor A heating cooker comprising: a no-load determination unit that determines whether there is no object to be heated in the heating chamber based on the temperature of the atmosphere. The heating cooker according to claim 1, wherein
In the state where the fan control unit stops the fan, the no-load determination unit has an increase amount per unit time of the temperature of the atmosphere in the heating chamber detected by the internal temperature sensor equal to or higher than a first threshold value. And when the amount of increase in the temperature of the atmosphere in the exhaust path detected by the exhaust temperature sensor per unit time is less than a second threshold value, there is no object to be heated in the heating chamber. It is determined that the heating cooker. The heating cooker according to claim 1 or 2,
A steam generator disposed in the casing and generating steam to be supplied to the heating chamber;
A steam generation control unit for controlling the steam generator,
The steam generation control unit uses the steam generator to determine whether or not there is no object to be heated in the heating chamber by the no-load determination unit at the start of cooking using steam. A cooking device, wherein steam generation is stopped for a predetermined time from the start of the cooking. In the heating cooker according to any one of claims 1 to 3,
A power shut-off unit that shuts off power input to the main unit
If the no-load determination unit determines that there is no object to be heated in the heating chamber after the start of cooking, the power shut-off unit shuts off the power input to the main body. Cooking cooker. In the heating cooker according to any one of claims 1 to 4,
With a display,
If the said no-load determination part determines that it is the no-load state which does not have a to-be-heated object in the said heating chamber after the start of cooking, the said display part will be in the no-load state which has no to-be-heated object in the said heating chamber. A cooking device characterized by displaying that there is.

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