JP2019066177A - Heating cooker - Google Patents

Abstract

To provide a heating cooker excellent in temperature detection of an object to be heated without depending on a height of a container, and further having an infrared sensor in which influence of temperature and radio wave leakage are taken into consideration.SOLUTION: A heating cooker comprises: a heating chamber 28 configured to put an object to be heated 60c into a body 1 and then heat it; heating means of heating the object to be heated 60c; an infrared sensor 52 configured to detect a surface temperature of the object to be heated 60c obliquely above from the object to be heated 60c; a motor 51 configured to drive the infrared sensor 52 so as to detect a temperature in a height direction of a side surface of the object to be heated 60c; and control means of controlling the heating means based on the detected temperature in the infrared sensor 52.SELECTED DRAWING: Figure 4

Description

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

  In the known techniques disclosed in Patent Document 1 and Patent Document 2, infrared sensors for detecting the temperature of food in the heating chamber detect a plurality of infrared rays aligned in a straight line so that the temperature of the entire region of the heating chamber can be detected. An infrared sensor having an element is provided at the back wall surface of the heating chamber or at a corner between the top surface and the back wall surface, and the infrared sensors are simultaneously arranged by the plurality of linearly arranged infrared detection elements in the front-rear direction of the heating chamber The temperature of the location is detected, the infrared sensor is swung left and right in the left and right direction of the heating chamber, and the infrared sensor is swung in the left and right direction to measure a plurality of temperatures in the heating chamber by scanning. is there.

  Further, in Patent Document 3, an infrared sensor provided with a plurality of linearly arranged infrared detection elements is attached to the right side, and scanning is performed from the back side to the front side of the heating chamber to measure a plurality of temperatures in the heating chamber It is.

Unexamined-Japanese-Patent No. 2003-336849 JP, 2009-24915, A JP, 2008-218319, A

  When the temperature of the object to be heated placed on the bottom of the heating chamber is detected, the infrared sensors shown in Patent Documents 1 and 2 swing the infrared sensor in the left-right direction from diagonally above the back wall of the heating chamber. Temperature will be measured.

In that case, since the detection angle detected from the obliquely upper side is fixed by the plurality of infrared detection elements linearly aligned in the front-rear direction of the heating chamber, the detection location of the infrared sensor is limited. In the horizontal direction, the infrared sensor provided with the plurality of linearly arranged infrared detection elements is swung to the left and right to sequentially measure temperatures at a plurality of locations in the heating chamber. Accordingly, the measurement points can be measured roughly or finely.

Further, when detecting the temperature of the object to be heated placed on the bottom surface of the heating chamber, the infrared sensor shown in the above-mentioned Patent Document 3 measures the infrared sensor from diagonally above the side top of the heating chamber (front side and back side) Swing in the direction) to measure temperature.

In that case, the detection position is limited because the detection angle at which the infrared sensor is detected from the obliquely upper side is fixed by the plurality of infrared detection elements linearly aligned in the left-right direction of the heating chamber. In order to sequentially measure the temperature at a plurality of locations in the heating chamber by swinging back and forth the infrared sensor provided with the plurality of linearly arranged infrared detection elements in the front and back direction, the measurement point is preferred in the front and back direction Accordingly, the measurement points can be measured roughly or finely.

However, in the case of directly detecting the temperature of the object to be heated (for example, milk) placed in the cup placed in the central part of the heating chamber, the object placed in the cup should be within the viewing angle of the infrared detection element. In addition, it is necessary to orient the infrared element in the direction to look at the object to be heated from above the cup.

Therefore, in the case of detecting the temperature of the object to be heated from diagonally above, in order to directly detect the temperature of the object to be heated placed in the containers having different heights, the openings located at different heights for each of the containers In order to be able to detect the temperature of the object to be heated, it is necessary to be able to finely measure the temperature in the height direction of the container.

In the structure of the infrared sensor shown in each of the patent documents mentioned above, the detection angle detected from diagonally above by the plurality of infrared detecting elements provided is fixed, so the container placed in the central part of the heating chamber Since the detection position of the temperature in the height direction is fixed, there are cases where the temperature of the object to be heated can not be detected from the openings located at different heights for each container.

The present invention has been made to solve the above-described problems, and includes a heating chamber for inserting and heating an object to be heated, a heating means for heating the object to be heated, and the object to be heated from above the object to be heated. An infrared sensor for detecting a surface temperature of a heating object, a motor for driving the infrared sensor to detect a temperature in the height direction of the side surface of the object to be heated, and the heating means based on the detection temperature of the infrared sensor And control means for controlling.

According to the present invention, the temperature of the object to be heated is excellently detected regardless of the height of the container, and the infrared sensor is a heating cooker that is also considered against the influence of temperature and radio wave leakage. it can.

The front perspective view of the cooking-by-heating machine concerning the example of the present invention. The back perspective view which removed the outer frame of the heating cooker which concerns on the Example of this invention. AA sectional drawing of FIG. Operation explanatory drawing of the infrared sensor which used FIG. 3 sectional drawing. The enlarged view for description of the infrared sensor part which shows a reference (standard) position. The enlarged view for description of the infrared sensor which shows an end point position. The enlarged view for description of the infrared sensor which shows the state which closed the observation window.

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 attached drawings.

1 to 3 show the main parts of this embodiment, and FIG. 1 is a perspective view of the heating cooker main body as viewed from the front side, and FIG. 2 is from the rear side with the outer frame of the main body removed. FIG. 3 is a cross-sectional view taken along the line A-A of FIG.

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

The door 2 is opened and closed in order to put food in and out of the heating chamber 28, and by closing the door 2, the heating chamber 28 is sealed to prevent leakage of microwaves used when heating the food. Containing the heat of the heater and the superheated steam, it is possible to heat efficiently.

The handle 9 is attached to the door 2 to facilitate opening and closing of the door 2 and has a shape that can be easily grasped by hand.

The glass window 3 is attached to the door 2 so that the state of the food being cooked can be confirmed, and glass that withstands high temperature due to heat generation such as a heater is used.

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 temperature such as heating unit such as microwave heating and heater heating and heating time, and operation unit 6 And the display unit 5 for displaying the progress of the cooking and the contents input from the display unit 5. The outer frame 7 is a cabinet that covers the upper surface and the left and right sides of the main body 1 of the heating cooker.

The water tank 42 is a container for storing water necessary for producing heating steam, is provided on the lower front side of the main body 1 of the heating cooker, and is configured to be removable from the front surface of the main body 1 And drainage is easy to be able to do.

The back plate 10 forms the back face of the cabinet described above, has an external exhaust duct 18 attached to the top, and cools air after exhausting the food or cooling the parts inside the main body 1 (waste heat) 39 is discharged from the external exhaust port 8 of the external exhaust duct 18.

The machine room 20 is provided in the space between the heating room bottom surface 28 a and the bottom plate 21 of the main body 1, and on the bottom plate 21 is a waveguide 33 connected to a magnetron 33 and a magnetron 33 for heating food. A control board 23, various components to be described later, and a fan device 15 for cooling the various components are attached. The heating chamber bottom surface 28a has a substantially central portion recessed and the rotary antenna 26 is installed therein, and the microwave energy radiated from the magnetron 33 passes through the waveguide 47 and the output shaft 46a of the rotary antenna 26 The light flows into the lower surface of the rotary antenna 26 through the opening 47 a and is diffused by the rotary antenna 26 and radiated into the heating chamber 28. The output shaft 46 a of the rotary antenna 26 is connected to the rotary antenna driving means 46.

The fan unit 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 magnetron 33, the inverter substrate (not shown) generating heat in the machine room 20, the weight detection means 25c, 25b and the like. Further, while flowing 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 and cooling the outer frame 7 and the rear plate 10, the outer exhaust port 8 of the outer exhaust duct 18 It is discharged more. Furthermore, a duct 16a for cooling the hot air motor 13 described later and a duct 16b for cooling the infrared unit 50 housed in the infrared case 48 described later are provided, and the cooling air 39 which has cooled the infrared unit 50 is The exhaust heat (such as water vapor) in the heating chamber 28 is discharged from the opposite side of the exhaust duct 28 e and then discharged out of the external exhaust duct 18.

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

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

Further, the hot air unit 11 is provided with the hot air case 11a on the rear side of the heating chamber inner wall surface 28b, and the hot air heater 14 is positioned between the heating chamber inner wall surface 28b and the hot air case 11a on the outer peripheral side of the hot air fan 32 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.

The hot air motor 13 is raised in temperature by heat from the heating chamber 28 and the hot air heater 14 and is enclosed by a hot air motor cover 17 to form a substantially cylindrical shape and the duct 16a is formed into a hot air case 11a and a rear plate 10 in order to prevent it. And 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 unit 15, and a part of the cooling air 39 from the fan unit 15 is The hot air motor cover 17 is incorporated.

The grill heating means 12 which consists of a heater is attached to the back side of the heating chamber top surface 28c of the heating chamber 28. As shown in FIG. The grill heating means 12 forms a planar shape by winding a heater wire around a mica plate, pressing it against the top back side of the heating chamber 28 and fixing it, heating the top surface of the heating chamber 28 to store the food in the heating chamber 28 It is baked by radiant heat.

Further, an infrared ray unit 50 described later is provided on the back side of the heating chamber top surface 28c of the heating chamber 28, and is covered with an infrared ray case 48 to cool the infrared ray unit 50. The upper end opening of the duct 16b is connected to the side surface of the infrared case 48 while the lower end opening is connected to the upper surface of the heat motor cover 17, and the cooling air from the fan unit 15 is located between the hot air case 11a and the rear plate 10. I try to incorporate part of 39.

Further, on the heating chamber bottom surface 28a, a plurality of weight detection means 25, for example, a right side weight sensor 25b, a left side weight sensor (not shown) on the front left and right, and a back side weight sensor 25c on the rear center, The table plate 24 is placed. The table plate 24 is for placing a food, and is formed of a material having heat resistance so as to be used for both heater heating and microwave heating, and having good microwave permeability.

The boiler 43 is attached to the outer surface of the hot air case 11 a of the hot air unit 11 and makes saturated water vapor in the hot air unit 11, and the saturated water vapor jetted into the hot air unit 11 is heated by the hot air heater 14 and becomes superheated water vapor.

The pump means 87 is for pumping up the water in the water tank 42 to the boiler 43, and comprises 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.

Reference numeral 51 denotes a motor, and the direction of the motor 51 is mounted parallel to the rotating shaft 51a and the heating chamber inner wall surface 28b. Then, the rotation shaft 51a rotates (drives) a cylindrical unit case 54 described later, thereby rotating the substrate 53 mounted with the infrared sensor 52 housed in the unit case 54, thereby setting the direction of the lens portion 52a of the infrared sensor 52 The temperature can be detected by rotational movement in a range from about 30% from the lower side in the height direction of the heating chamber opening 28d from the back side (the heating chamber rear wall surface 28b side) of the heating chamber bottom surface 28a. The motor 51 uses a stepping motor, and can be operated in forward rotation, reverse rotation, and a rotation angle according to control of a control unit provided on the control board 23.

An infrared sensor 52 is provided with a plurality of infrared detection elements (for example, thermopiles). Here, an infrared sensor in which eight elements are aligned in a line in the vertical direction of the rotation shaft 51a is used. Therefore, the temperature of the plurality of locations can be detected at one time in the left-right direction of the heating chamber bottom surface 28a, and an infrared ray sensor from the back side (heating chamber back wall surface 28b side) to the front side (door 2 side) of the heating chamber 28 By rotating 52, the temperature of the entire area of the bottom surface 28a of the heating chamber is detected.

Reference numeral 54 denotes a cylindrical unit case, in which a substrate 53 is disposed at the maximum diameter portion, and a window 54a is provided to allow the lens 52a of the infrared sensor 52 to face. Further, carbon is included in the material of the unit case 54 to prevent the external noise from entering the unit case 54 by making the characteristics of the unit case 54 a conductive material.

55 is 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). Further, in order to prevent the temperature of the heating chamber 28 from being transmitted to the unit case 53, an air passage 55c having a gap along the outer periphery of the unit case 53 is formed to allow the cooling air to flow to the outer periphery of the unit case 53. The shutter 55 is disposed in the air passage 55c, and the air passage 55c is provided with an opening 55a and an opening 55b serving as an inlet and outlet for flowing the cooling air 39.

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

An arc-shaped observation portion 44 discharged inward of the heating chamber 28 is provided along the center of rotation of the rotation 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 position of the arc-shaped observation unit 44 are all the same. An observation window 44 a is provided in the observation unit 44 and opens a range serving as a visual field range detected by the infrared sensor 52. Further, in order to prevent microwave leakage from the observation window 44a at the time of microwave heating, a rising wall (burring) 44b of about 2 mm is provided on the outer periphery of the observation window 44a.

By projecting the observation part 44 inside the heating chamber 28, it is possible to detect a wide range of temperatures with a minimum narrow observation window opening range.

A convex portion 49 separates the infrared case 48 and the infrared unit 50 from the heating chamber top surface 28c, and only the convex portion 49 makes contact with the heating chamber top surface 28c at the time of heating. The temperature of the heating chamber top surface 28 c heated by the heater of the unit 11 or the like is not easily transmitted to the infrared unit 50.

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

When the glass 60 is placed on the table plate 24 provided on the bottom surface 28a of the heating chamber as an example of a container opened at the upper side containing the object to be heated (milk) 60c and heating is started, the magnetron 33 stably emits light The observation window 44a is closed by the shutter 55 for 1 to 2 seconds (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. The rotation of the rotation shaft 51a to the reference position causes the unit case 54 to rotate, and the orientation 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, since the cooling air 39 flows through the lens portion 52a of the infrared sensor 52 and flows from the sensor window portion 44a to the heating chamber 28, the adhesion of dirt to the lens portion 52a is prevented.

By rotating the unit case 54, detection of the temperature of the object to be heated 60c proceeds from the reference position (detection point a) described above to the detection point b and detection point c of the table plate 24, and further when the unit case 54 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 top of the opening of the glass 60, the temperature of the surface of the object 60c is detected at the detection point f, and then the temperature inside the glass 60 is detected at the detection point g, and then The temperature of the table plate 24 is detected at the detection point h, and the temperature of the end door 2 is detected at the detection point i.

The detection of the temperature in the temperature detection range of the detection point a to the detection point i may be performed in both of the reciprocation of rotating the unit case 54, or after the temperature detection is once performed to the end point, return to the reference position again. From the detection point a to the detection point i again. The number of detected temperatures is changed to preference, and the above-described detection point a to detection point i are illustrative examples.

The temperature may be detected in a state where the motor 51 is rotated, or while the temperature is detected, the rotation of the motor 51 may be stopped and detected, and then the rotation may be performed. However, if you want to accurately detect the temperature, it is better to stop the rotation and measure. For example, at the beginning of heating, the temperature is detected while rotating the unit case 54, the object 60c is heated, and the temperature rise is detected, and then the detection point in the vicinity where the temperature is rising is used to rotate the unit case 54. It may be stopped finely and a large amount of temperature of the object to be heated 60c may be detected. By doing so, when the temperature of the object to be heated 60c placed in the tall cup 60 is detected, the range in which the temperature of the object to be heated 60c can be directly detected becomes narrow, which is effective for temperature detection in a narrow range. .

Further, the end point of the temperature detection point i is provided up to the position where the temperature of the door 2 is detected even when the cup 60 containing the object to be heated 60c is placed on the front side of the heating chamber 28 This is because the surface 60 of the object 60c is expanded from the upper opening 60 to a position where the surface temperature of the object 60c can be detected.

Further, when the weight information is light and the temperature rise of the temperature distribution is widely recognized from the weight information by the weight detection means 25 and the temperature distribution information detected by the infrared sensor 52, it can be judged that the object 60c is thin and light. Further, when the weight information is heavy and the temperature rise of the temperature distribution is recognized only in the narrow range, it can be judged that the object 60c is put in the tall cup 60, for example.

In the present embodiment, the infrared unit 50 is provided on the heating chamber top surface 28c, but the infrared unit 50 is attached to any of the heating chamber back wall surface 28b, the heating chamber left wall surface, and the heating chamber right wall surface. When attached to the heating chamber inner wall surface 28b, the motor 51 is installed parallel to the rotating shaft 51a and the heating chamber inner wall surface 28b, and the rotation of the unit case 54 is accommodated in the unit case 54 The direction of the lens part 52a of the infrared sensor 52 is rotationally moved in the range from about 30% from the bottom in the height direction of the heating chamber opening 28d from the back side (the heating chamber back wall surface 28b side) of the heating chamber bottom 28a Make it possible to detect When attached to the left side of the heating chamber, the motor 51 is installed parallel to the rotating shaft 51a and the left side of the heating chamber, and the rotation of the unit case 54 is the infrared sensor 52 housed in the unit case 54. The direction of the lens part 52a is rotationally moved in the range of about 30% from the lower side in the height direction of the right side of the heating chamber bottom surface 28a (right side of the heating chamber bottom surface) from the left side of the heating chamber bottom surface 28a Temperature to be detected. By doing so, it is possible to detect the temperature of the object to be heated 60c placed in the cup 60 placed on the right side. Even when attached to 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 attached to the left side, the right side, and the front side of the heating chamber top surface 28c, if it is installed based on the same idea, the temperature of the object 60c can be accurately detected.

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

Furthermore, in the present embodiment, the method of detecting the temperature of the object 60c placed in the cup 60 has been described in detail, but even if the object 60c without a container is a block-like large block, the block-like object is heated. Since the temperature in the height direction and the upper surface of the side 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 detection of the object to be heated is excellent regardless of the height of the container, and the infrared sensor is a heating cooker that is also considered against the influence of temperature and radio wave leakage. be able to. In summary, the present invention provides “a heating chamber for heating and heating the object to be heated, heating means for heating the object to be heated, and an infrared sensor for detecting the surface temperature of the object to be heated from diagonally above the object to be heated” A motor for driving the infrared sensor to detect temperature in the height direction of the side surface of the object to be heated, and control means for controlling the heating means based on the detected temperature of the infrared sensor A cooking device characterized by the above. Furthermore, according to the present invention, “the infrared sensor is for detecting the temperature of the object to be heated through the observation window, and the shutter has a shutter that closes the observation window when the infrared sensor is not used. It is constituted like "heating cooker". According to the present invention, “a heating chamber for putting and heating a heating object, a heating means for heating the object to be heated, an infrared ray unit provided on the back side of the heating chamber, and the infrared unit are housed An infrared sensor for detecting the surface temperature of the object from above the object to be heated, a motor for driving the infrared sensor to detect the temperature in the height direction of the side surface of the object, and the infrared ray A heating cooker characterized by comprising: control means for controlling the heating means based on a temperature detected by a sensor; and cooling means for guiding a cooling air to the infrared unit. Furthermore, in the present invention, “the infrared sensor is for detecting the temperature of the object to be heated through the observation window, and includes a shutter that closes the observation window when the infrared sensor is not used, and The heating cooker is configured to form an air path for guiding the cooling air between the shutter and the infrared sensor when the sensor is not used.

Reference Signs List 1 heating cooker 44 arc portion 48 infrared case 49 convex portion 50 infrared unit 51 motor 52 infrared sensor 54 unit case 55 shutter

Claims (1)

A heating chamber for placing and heating an object to be heated;
Heating means for heating the object to be heated;
An infrared unit provided on the far side of the heating chamber,
An infrared sensor which is accommodated in the infrared unit and detects the surface temperature of the heating object from an upper side of the heating object;
A motor that rotationally drives the infrared sensor to detect temperature in the height direction of the side surface of the object to be heated;
Control means for controlling the heating means based on the temperature detected by the infrared sensor;
And cooling means for guiding a cooling air to the infrared unit;
The infrared sensor detects the temperature of the object to be heated through an arc-shaped observation window discharged inward of the heating chamber, and the arc sensor closes the observation window when the infrared sensor is not used. And a wind path for guiding the cooling air between the shutter and the infrared sensor when the infrared sensor is not used.
A heating cooker characterized in that the rotation center of the infrared sensor and the center of the arc of the arc-shaped shutter and the center positions of the arc-shaped observation window are at the same position.

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