JP6637584B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device, and more particularly to a cooking device provided with an infrared sensor for measuring the temperature of an object (food) to be heated in a heating chamber.

  According to the known technology disclosed in Patent Document 1 and Patent Document 2, an infrared sensor that detects the temperature of food in a heating chamber detects a plurality of infrared rays that are linearly arranged so as to detect the temperature of the entire area of the heating chamber. An infrared sensor having an element is provided at the inner wall surface of the heating chamber or at a corner between the top surface and the inner wall surface, and the infrared sensor is simultaneously arranged in the front-back direction of the heating chamber by the plurality of infrared detecting elements arranged in a straight line. Detecting the temperature of the location, the left and right direction of the heating chamber swings the infrared sensor left and right, swings the infrared sensor in the left and right direction and scans to measure a plurality of temperatures in the heating chamber. is there.

  Further, Patent Document 3 discloses an infrared sensor provided with a plurality of infrared detecting elements arranged in a straight line on a right side surface, and scans from the back of the heating chamber to the near side to measure a plurality of temperatures in the heating chamber. It is.

JP 2003-336849 A JP 2009-24915 A JP 2008-218319 A

  When detecting the temperature of an object to be heated placed on the bottom surface of the heating chamber, the infrared sensors disclosed in Patent Documents 1 and 2 swing the infrared sensor in the left-right direction from diagonally above the upper rear wall of the heating chamber. Temperature measurement.

In this case, the detection position of the infrared sensor is limited in the front-rear direction of the heating chamber because the detection angle of the infrared sensor that is detected obliquely from above by a plurality of linearly aligned infrared detection elements is limited. In the left-right direction, the infrared sensor provided with the plurality of infrared detection elements aligned in a straight line is swung right and left to sequentially measure the temperature at a plurality of locations in the heating chamber. Accordingly, the measurement point can be roughly or finely measured.

When detecting the temperature of an object to be heated placed on the bottom surface of the heating chamber, the infrared sensor disclosed in Patent Document 3 moves the infrared sensor forward and backward (front side and back side) from the upper side of the side of the heating chamber. ) To measure the temperature.

In that case, the detection position of the infrared sensor is limited in the left-right direction of the heating chamber, since the detection angle for obliquely detecting the infrared sensor by a plurality of linearly arranged infrared detection elements is fixed. In the front-back direction, the infrared sensor provided with the plurality of infrared detection elements aligned in a straight line swings back and forth to sequentially measure the temperature at a plurality of locations in the heating chamber. Accordingly, the measurement point can be roughly or finely measured.

Here, if it detects the temperature of the object to be heated placed in a cup placed on the central portion of the heating chamber (e.g. milk), the object to be heated which is placed on the cup enters the viewing angle of the infrared detection element As described above, it is necessary to point the infrared element in a direction in which the object to be heated is viewed from above the cup.

In the case of detecting the temperature of the heated object obliquely from above is to test knowledge the temperature of the object to be heated is placed in a different container heights, from the opening positioned at different heights in the respective container so as to detect the temperature of the heated object, should there be a configuration capable of measuring the temperature at the height of the container.

In the structure of the infrared sensor disclosed in each of the aforementioned patent documents, the temperature of the object to be heated may be affected by the temperature .

The present invention has been made to solve the above problems, as well as heat putting an object to be heated, a heating chamber having an upwardly observation window, a heating means for heating the object to be heated, before Symbol an infrared sensor for detecting the temperature of the heated object, together fit the infrared sensor, and a unit case having a window for exposing the infrared sensor, an arcuate portion outer shape other than the window portion is arcuate, the An observation section having an arc-shaped inner surface facing the arc-shaped portion of the unit case, the observation window having the observation window opened on the arc-shaped inner surface, and a control means for controlling the heating means based on a detection temperature of the infrared sensor, And rotating the unit case so that the window portion faces the observation window and the arc-shaped portion faces the observation window.

According to the present invention, excellent temperature detection of the object to be heated, further infrared sensor may be a heating cooker which is also considered for the effect of temperature.

The front perspective view of the heating cooker concerning the example of the present invention. The rear perspective view which removed the outer frame of the cooking device concerning the Example of this invention. AA sectional drawing of FIG. Operation | movement explanatory drawing of the infrared sensor which used FIG. 3 sectional drawing. FIG. 3 is an enlarged view for explaining an infrared sensor unit indicating a reference position. FIG. 3 is an enlarged view for explaining an infrared sensor showing an end point position. FIG. 2 is an enlarged view for explaining an infrared sensor showing a state in which an observation window is closed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3 show main parts of the present embodiment. FIG. 1 is a perspective view of a heating cooker main body viewed from the front side, and FIG. 2 is a rear view of the main body without the outer frame. FIG. 3 is a sectional view taken along line AA of FIG.

In the figure, a main body 1 of a heating cooker puts a food to be heated in a heating chamber 28 and heats and cooks the food using microwaves, the heat of a heater, and superheated steam.

The door 2 opens and closes to put food in and out of the heating chamber 28, and closes the door 2 to close the heating chamber 28 to prevent leakage of microwaves used when heating the food. The heat of the heater and the superheated steam are confined to enable efficient heating.

The handle 9 is attached to the door 2 to facilitate opening and closing of the door 2, and has a shape that is easy to grasp by hand.

The glass window 3 is attached to the door 2 so that the state of the food being cooked can be checked, and is made of glass that can withstand high temperatures due to heat generated by a heater or the like.

The input unit 71 is provided on the operation panel 4 on the lower front side of the door 2, and includes an operation unit 6 for inputting heating means such as microwave heating or heater heating, a heating time and the like, and a heating temperature. And a display unit 5 for displaying the contents input from the device and the progress of cooking. The outer frame 7 is a cabinet that covers the upper surface and the left and right side surfaces of the main body 1 of the cooking device.

The water tank 42 is a container for storing water necessary for producing steam to be heated. The water tank 42 is provided below the front surface of the main body 1 of the cooking device, and has a structure detachable from the front surface of the main body 1 to supply water. And drainage can be done easily.

The rear plate 10 forms the rear surface of the cabinet described above. An external exhaust duct 18 is attached to an upper portion of the rear plate 10, and cooling air (waste heat) after cooling steam discharged from food and internal components of the main body 1. 39 is discharged from the external exhaust port 8 of the external exhaust duct 18.

The machine room 20 is provided in a space between the heating chamber bottom surface 28 a and the bottom plate 21 of the main body 1. On the bottom plate 21, a magnetron 33 for heating food, a waveguide 47 connected to the magnetron 33, A control board 23, other various components described later, a fan device 15 for cooling these various components, and the like are attached. The heating chamber bottom surface 28a is substantially concave at the center, and the rotating antenna 26 is installed therein. The microwave energy radiated from the magnetron 33 passes through the waveguide 47 and the output shaft 46a of the rotating antenna 26 penetrates. The liquid flows into the lower surface of the rotating antenna 26 through the opening 47a, and is diffused by the rotating antenna 26 and radiated into the heating chamber 28. The output shaft 46a of the rotating antenna 26 is connected to the rotating antenna driving means 46.

The fan device 15 includes a cooling fan attached to a cooling motor attached to the bottom plate 21. The cooling air 39 generated by the fan device 15 cools the self-heating magnetron 33, the inverter board (not shown), the weight detecting means 25c, 25b, and the like in the machine room 20. In addition, the air flows between the outside of the heating chamber 28 and the outer frame 7 and between the hot air case 11a and the rear plate 10 as described above. Is more exhausted. Further, a duct 16a for cooling a hot air motor 13 described later and a duct 16b for cooling an infrared unit 50 housed in an infrared case 48 described later are provided. After being exhausted from the opposite side of the exhaust duct 28e for discarding exhaust heat (such as water vapor) in the heating chamber 28, the exhaust heat is exhausted from the external exhaust duct 18.

A hot air unit 11 is attached to the rear of the heating chamber 28, a hot air fan 32 for efficiently circulating the air in the heating chamber 28 is installed in the hot air unit 11, and an air passage is provided on the rear wall 28b of the heating chamber. A hot air intake hole 31 and a hot air outlet hole 30 are provided.

The hot air fan 32 is rotated by driving a hot air motor 13 attached to the outside of the hot air case 11a, and heats the air circulated by the hot air heater 14.

The hot air unit 11 is provided with a hot air case 11a on the rear side of the heating chamber inner wall surface 28b, and a hot air heater 32 between the heating chamber inner wall surface 28b and the hot air case 11a so as to be located on the outer peripheral side thereof. The hot air motor 13 is attached to the rear side of the hot air case 11a, and the motor shaft is connected to the hot air fan 32 through a hole provided in the hot air case 11a.

Since the temperature of the hot air motor 13 rises due to heat from the heating chamber 28 and the hot air heater 14, in order to prevent the temperature rise, the hot air motor 13 is surrounded by a hot air motor cover 17, and is formed in a substantially cylindrical shape. , The upper end opening of the duct 16a is connected to the lower surface of the hot air motor cover 17, the lower end opening is connected to the outlet of the fan device 15, and a part of the cooling air 39 from the fan device 15 is It is designed to be taken into the hot air motor cover 17.

On the back side of the heating chamber top surface 28c of the heating chamber 28, the grill heating means 12 including a heater is attached. The grill heating means 12 is formed by winding a heater wire around a mica plate to form a flat shape, pressing the mica plate against the back side of the top surface of the heating chamber 28 and fixing the same, and heating the top surface of the heating chamber 28 to feed the food in the heating chamber 28. It is baked by radiant heat.

Further, an infrared unit 50 to be described later is provided on the back side of the heating chamber top surface 28c of the heating chamber 28. The infrared unit 50 is covered with an infrared case 48 to cool the infrared unit 50, and is formed in a substantially cylindrical shape. Located between the hot air case 11a and the rear plate 10, the upper end opening of the duct 16b is connected to the side of the infrared case 48, the lower end opening is connected to the upper surface of the hot air motor cover 17, and the cooling air from the fan device 15 I am trying to incorporate a part of 39.

Further, a plurality of weight detecting means 25, for example, a right weight sensor 25b and a left weight sensor (not shown) are provided on the front left and right sides, and a rear weight sensor 25c is provided at the center of the rear side on the bottom surface 28a of the heating chamber. A table plate 24 is placed. The table plate 24 is for placing food thereon, and is formed of a material having heat resistance and good microwave permeability so that it can be used for both heater heating and microwave heating.

The boiler 43 is attached to the outer surface of the hot air case 11a of the hot air unit 11, makes the saturated steam face the hot air unit 11, and the saturated steam ejected into the hot air unit 11 is heated by the hot air heater 14 to become superheated steam.

The pump means 87 pumps the water in the water tank 42 to the boiler 43, and includes a pump and a motor for driving the pump. Adjustment of the amount of water supplied to the boiler 43 is determined by the ON / OFF ratio of the motor.

Next, the infrared unit will be described in detail with reference to FIGS.

A motor 51 is mounted so that the direction of the motor 51 is parallel to the rotating shaft 51a and the inner wall surface 28b of the heating chamber. The rotating shaft 51a rotates (drives) a cylindrical unit case 54 described later, thereby rotating the substrate 53 on which the infrared sensor 52 housed in the unit case 54 is mounted, and thereby rotating the lens unit 52a of the infrared sensor 52. Is rotated from the back side of the heating chamber bottom surface 28a (the side of the heating chamber inner wall surface 28b side) in the height direction of the heating chamber opening 28d to a range of about 30% from below so that the temperature can be detected. The motor 51 uses a stepping motor and can operate the rotation shaft 51a in the normal rotation, the reverse rotation, and the rotation angle as desired under the control of a control unit provided on the control board 23.

Reference numeral 52 denotes an infrared sensor provided with a plurality of infrared detecting elements (for example, thermopile), and here, an infrared sensor in which eight elements are arranged in a line in the vertical direction of the rotating shaft 51a is used. Therefore, in the left and right direction of the bottom surface 28a of the heating chamber, it is possible to detect the temperature at a plurality of places at a time, and an infrared sensor is provided from the back side (the wall surface 28b side of the heating chamber) to the front side (the door 2 side). By rotating 52, the temperature of the entire area of the heating chamber bottom surface 28a is detected.

Numeral 54 denotes a cylindrical unit case, in which a substrate 53 is disposed at the largest diameter portion, and a window 54a is provided to allow the lens 52a of the infrared sensor 52 to face. In addition, carbon is included in the material of the unit case 54 to make the characteristics of the unit case 54 a conductive material, thereby preventing external noise from entering the unit case 54.

Reference numeral 55 denotes a shutter made of a metal plate. The shutter 55 closes an observation window 44a described later when the infrared sensor 52 is not used (see FIG. 7). In order that the temperature of the heating chamber 28 is prevented from being transmitted to the unit case 54, to form air passages 55c provided with a gap along the outer periphery of the unit case 54 so as flown cooling air to the outer periphery of the unit case 54 And an opening 55a and an opening 55b serving as entrances and exits for flowing the cooling air 39 into the air passage 55c.

Reference numeral 56 denotes a positioning convex portion. When the control unit controls the rotation of the motor 51 so that the detection point of the infrared sensor 52 is set at the reference position (detection point a in FIG. 4), the reference position of the detection point of the infrared sensor 52 is set. When the observation window 44a is closed by the shutter 55, the rotation shaft 51a is slipped in a state where the positioning convex portion 56 is in contact with a stopper (not shown) provided on the infrared case 48 so that the shutter 55 can be corrected. The position of the detection point a serving as the reference position controlled by the control unit and the reference position detected by the infrared sensor 52 can be corrected.

Reference numeral 44 denotes an arc-shaped observation section that protrudes inward of the heating chamber 28 and is provided along the rotation center of the rotating shaft 51a, the center of the cylindrical unit case 54, and the outer periphery of the unit case 54, and is bent in an arc shape. The center of the arc of the shutter 55 and the center of the arc-shaped observation unit 44 are all the same. Reference numeral 44a denotes an observation window provided in the observation unit 44, and an opening is provided in a range to be a visual field range detected by the infrared sensor 52. In order to prevent microwave leakage from the observation window 44a during microwave heating, a rising wall (burring) 44b is provided about 2 mm outside the periphery of the observation window 44a.

By protruding the observation unit 44 into the inside of the heating chamber 28, a wide range of temperature detection can be performed in a minimum narrow observation window opening range.

Reference numeral 49 denotes a convex portion, which separates the infrared case 48 and the infrared unit 50 from the heating room top surface 28c, and makes contact with the heating room top surface 28c only by the convex portion 49 so that the grill heating means 12 and the hot air The temperature of the heating chamber top surface 28c heated by the heater of the unit 11 or the like is hardly transmitted to the infrared unit 50.

Next, the operation of detecting the temperature of the object to be heated will be described.

When the cup 60 is placed on the table plate 24 provided on the bottom surface 28a of the heating chamber and heating is started as an example of an open-ended container containing the object to be heated (milk) 60c, the magnetron 33 emits a stable signal. For one to two seconds, the observation window 44a is closed by the shutter 55 (see FIG. 7) to prevent noise due to unstable transmission at the start of transmission of the magnetron 33 from entering the infrared sensor 52.

After the transmission of the magnetron 33 is stabilized, the control means controls the rotation shaft 51a of the motor 51 to rotate to the reference position. When the rotation shaft 51a rotates to the reference position, the unit case 54 also rotates, and the direction of the lens portion 52a of the infrared sensor 52 also rotates to a position where the detection point a of the reference position can be detected (see FIGS. 4 and 5). . At this time, the cooling air 39 flows through the lens portion 52a of the infrared sensor 52 and flows from the observation window 44a to the heating chamber 28, thereby preventing dirt from adhering to the lens portion 52a.

By rotating the unit case 54, the detection of the temperature of the object to be heated 60c proceeds from the above-described reference position (detection point a) to the detection points b and c of the table plate 24, and when the unit case 54 further rotates, The temperature outside the cup 60 is detected in the height direction, and the temperature from the detection point d to the detection point e is detected. After the detection point reaches the vertex of the opening of the cup 60, the temperature of the surface of the object to be heated 60c is detected at the detection point f, and then the temperature inside the cup 60 is detected at the detection point g, The temperature of the table plate 24 is detected at a detection point h, and the temperature of the door 2 at the end point is detected at a detection point i.

The detection of the temperature in the temperature detection range from the detection point a to the detection point i may be performed during both reciprocating rotations of the unit case 54, or after the temperature is detected up to the end point, the temperature is returned to the reference position again. From the detection point a to the detection point i. The number of detected temperatures can be changed as desired, and the above-described detection points a to i are examples for explanation.

Further, the temperature may be detected while the motor 51 is rotating, or while the temperature is being detected, the rotation of the motor 51 may be stopped and detected, and the rotation may be performed after the detection. However, if you want to accurately detect the temperature, it is better to stop rotation and measure. For example, at the beginning of heating, the temperature is detected while rotating the unit case 54, and after the object to be heated 60c is heated and a rise in temperature is detected, a detection point near the temperature rise is detected by rotating the unit case 54. The temperature of the object to be heated 60c may be detected by detecting the temperature of the object to be heated 60c. By doing so, when detecting the temperature of the heated object 60c placed in the tall cup 60, the range in which the temperature of the heated object 60c can be directly detected is narrowed, which is effective for temperature detection in a narrow range. .

Further, the reason why the end point of the temperature detection point i is provided to the position where the temperature of the door 2 is detected is that even if the cup 60 containing the object to be heated 60c is placed in front of the heating chamber 28, This is because the area has been expanded from the upper opening of 60 to a position where the surface temperature of the object to be heated 60c can be detected.

Further, when the weight information is light from the weight information by the weight detecting means 25 and the temperature distribution information detected by the infrared sensor 52 and the temperature rise of the temperature distribution is recognized in a wide range, it can be determined that the object to be heated 60c is thin and light. When the weight information is heavy and the temperature rise of the temperature distribution is found only in a narrow range, it can be determined that the object to be heated 60c is placed in, for example, a tall cup 60.

In the present embodiment, the infrared unit 50 is provided on the top surface 28c of the heating chamber. However, the mounting position of the infrared unit 50 is mounted above any one of the inner wall surface 28b of the heating room, the left wall surface of the heating room, and the right wall surface of the heating room. When mounted on the inner wall surface 28b of the heating chamber, the motor 51 is mounted so that the direction of the motor 51 is parallel to the rotating shaft 51a and the inner wall surface 28b of the heating chamber, and the rotation of the unit case 54 is accommodated in the unit case 54. The direction of the lens portion 52a of the infrared sensor 52 is rotationally moved in a range from the lower side of the heating chamber bottom surface 28a (the side of the heating chamber inner wall surface 28b side) to the height direction of the heating chamber opening portion 28d from about 30% below. Can be detected. When mounted on the left wall of the heating chamber, the motor 51 is mounted so that the rotating shaft 51a is parallel to the left wall of the heating chamber, and the rotation of the unit case 54 is controlled by the infrared sensor 52 contained in the unit case 54. The direction of the lens portion 52a is rotated from the left side of the heating chamber bottom surface 28a (the left wall side of the heating chamber) to the right side of the heating chamber bottom surface 28a (the right wall surface of the heating chamber) in a range of about 30% from below in the height direction. To detect temperature. By doing so, the temperature of the heated object 60c placed in the cup 60 on the right side can be detected. When mounted on the right wall of the heating chamber, the temperature of the object to be heated can be detected in the same way.

Further, even when the infrared unit 50 is mounted on the left side, right side, or front side of the top surface 28c of the heating chamber, if the infrared unit 50 is installed based on the same idea, the temperature of the heated object 60c can be accurately detected.

Further, in the case of performing the temperature detection according to the present embodiment in the relationship between the length in the front-rear direction and the length in the left-right direction of the bottom surface 28a of the heating chamber on which the object to be heated 60c is placed, the infrared sensor 52 is moved in the short front-back direction. Is suitable for detecting the temperature of the heated object 60c placed in the cup 60.

Further, in this embodiment, the method of detecting the temperature of the heated object 60c placed in the cup 60 has been described in detail. However, even when the heated object 60c that does not use a container is a large block-shaped lump, Since the height direction of the side surface and the temperature of the upper surface of the object 60c can be detected, the temperature distribution of the object to be heated 60c can be detected in detail.

  According to the above-described embodiment, the temperature of an object to be heated is excellently detected without being affected by the height of the container, and the infrared sensor is a heating cooker that is also considered for the influence of temperature and radio wave leakage. be able to. In summary, the present invention relates to a heating chamber that heats the object to be heated, a heating unit that heats the object to be heated, and an infrared sensor that detects the surface temperature of the object to be heated obliquely from above the object to be heated. A motor that drives the infrared sensor to detect a temperature in a height direction of a side surface of the object to be heated, and a control unit that controls the heating unit based on a temperature detected by the infrared sensor. A characteristic heating cooker. " Further, in the present invention, "the infrared sensor detects the temperature of the object to be heated through an observation window, and includes a shutter for closing the observation window when the infrared sensor is not used. Heating cooker ". Further, the present invention provides a heating chamber for heating the object to be heated, a heating unit for heating the object to be heated, an infrared unit provided on the back side of the heating chamber, and housed in the infrared unit. An infrared sensor that detects a surface temperature of the object to be heated from obliquely above the object to be heated, a motor that drives the infrared sensor to detect a temperature in a height direction of a side surface of the object to be heated, and an infrared sensor. A cooking device comprising: a control unit that controls the heating unit based on a temperature detected by a sensor; and a cooling unit that guides cooling air to the infrared unit. " Further, in the present invention, "the infrared sensor detects the temperature of the object to be heated through an observation window, and includes a shutter that closes the observation window when the infrared sensor is not used; A heating cooker that forms an air passage for guiding the cooling air between the shutter and the infrared sensor when a sensor is not used.

1 Cooking device 44 Observation unit 48 Infrared case 49 Convex part 50 Infrared unit 51 Motor 52 Infrared sensor 54 Unit case 55 Shutter

Claims (6)

A heating chamber having an observation window above and heating the object to be heated,
Heating means for heating the object to be heated ,
An infrared sensor for detecting the temperature of the pre-Symbol object to be heated,
A unit case that accommodates the infrared sensor and has a window portion facing the infrared sensor and an arc-shaped portion having an outer shape other than the window portion.
An observation unit having an arc-shaped inner surface facing the arc-shaped portion of the unit case, and having the observation window opened in the arc-shaped inner surface;
Control means for controlling the heating means based on the temperature detected by the infrared sensor,
A heating cooker characterized by taking a state in which the unit case is rotated so that the window portion faces the observation window and a state in which the arc-shaped portion faces the observation window.   The cooking device according to claim 1, wherein the infrared sensor is disposed near an end of a top plate of the heating chamber.   3. The cooking device according to claim 2, wherein a rotation axis of rotation of the unit case is configured to be parallel to a surface of a top plate.   The heating cooker according to claim 1, wherein a fan is disposed at a rear portion of the heating chamber, and cooling air energized by the fan is supplied to the infrared sensor via a ventilation path.   2. The cooking device according to claim 1, further comprising a stepping motor for rotating the unit case.   2. The cooking device according to claim 1, wherein the infrared sensor detects the temperature of the object to be heated at a plurality of locations as the unit case rotates.

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