JPH0791667A - Heating cooker - Google Patents

Abstract

PURPOSE:To provide a heating cooker in which a temperature sensor is low cost and a maintenance is unnecessary. CONSTITUTION:A temperature measuring unit 14 has a thermistor 15 and a transparent glass 16 for enclosing the thermistor 15 to be integrated by a resin package 17. Terminals 18, 19 are led from the package 17. Further, a convex lens 20 is formed as a heat collector corresponding to the thermistor 15 in the glass 16. The unit 14 is surrounded by a heat insulator 21 except the lens 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker provided with a temperature sensor for measuring the temperature of an object to be cooked.

[0002]

2. Description of the Related Art Conventionally, heating cookers such as ovens and microwave ovens have been equipped with a temperature sensor, and the temperature of the food to be heated is measured by the temperature sensor and used as a standard for controlling the cooking.

[0003]

By the way, conventionally, a temperature probe or an infrared temperature sensor is used as the temperature sensor. However, in the case of using the temperature probe, the detection rod of the temperature probe has to be directly inserted into the food to be heated, which is troublesome and requires cleaning after use. On the other hand, in the case of using a lobe or an infrared temperature sensor, there is a problem that the sensor itself is expensive and the product cost is high.

The present invention has been made in view of the above circumstances, and an object thereof is as a temperature sensor, a heating cooker which is inexpensive and requires no maintenance, and can be manufactured at low cost and improved in usability. To provide.

[0005]

The cooking device according to the present invention comprises:
A heating device for heating a food to be heated contained in a heating cooking chamber, and a temperature sensor for directly or indirectly measuring the temperature of the food to be heated, wherein the temperature sensor is a thermistor. The present invention is characterized in that the temperature measuring device is provided with a heat collecting device (the invention of claim 1).

A heating cooker according to another invention comprises a heating means for heating an object to be heated housed in a heating cooking chamber and a temperature sensor for directly or indirectly measuring the temperature of the object to be heated. In the provided one, the temperature sensor,
The present invention is characterized in that the thermistor is constituted by a temperature measuring device provided with a heat collecting device, and the heating and cooking operation is controlled based on the output of the temperature measuring device (the invention of claim 2).

In this case, the temperature measuring device may be surrounded by a heat insulating material (invention of claim 3). Also,
The heat collecting device may be composed of a convex lens (the invention of claim 4). Furthermore, the heat collecting device may be composed of a concave mirror (the invention of claim 5). A plurality of thermistors and heat collecting devices in the temperature measuring device may be provided (the invention of claim 6). The temperature measuring device may be configured to be cooled by a cooling device (the invention of claim 7).

[0008]

In the above means, since the temperature measuring device in which the thermistor is provided with the heat collecting device is used as the temperature sensor, the heat of the food to be heated is collected while using the thermistor which is a low cost temperature detecting element. Since the temperature of the food to be cooked can be effectively measured by collecting it in the thermistor by the heat device, the cost of the temperature sensor can be reduced, and the non-contact type can be fixedly used, which is different from the case of the temperature probe. No need for maintenance.

In addition to the above-mentioned effects, the other invention means controls the heating and cooking operation based on the output of the temperature measuring device, so that automatic control operation according to the temperature of the food to be heated is possible. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 2 and FIG.
In the cooker body 1, the inner box 3 is arranged inside the outer box 2, and the inside of the inner box 3 serves as a heating and cooking chamber 4, and a space between the inner box 3 and the outer box 2 is provided. A machine room 5 is formed therein. In the machine room 5, a magnetron 6 as a heating means is arranged and a machine room fan 7 as a cooling device is arranged. This machine room fan 7 has blades 8
And a machine room fan motor 9 for rotating the same.

Further, a hot air generating device 12 as a heating means composed of an oven heater 10 and an oven fan 11 is arranged on the back surface side of the back plate 4a of the heating and cooking chamber 4. The oven fan 11 includes an oven fan motor 11a and blades 11b.

A side wall 3a of the inner box 3 on the machine room 5 side.
A hole 13 is formed in the hole 13, and a temperature measuring device 14 as a temperature sensor is arranged so as to face the hole 13 in an oblique direction. This temperature measuring device 14 is shown in FIG.
As shown in FIG. 3, the thermistor 15 and the transparent glass 16 surrounding the thermistor 15 are integrated in a resin package 17, and terminals 18 and 19 are led out from the package 17. Further, a convex lens 20 as a heat collecting device is formed on the transparent glass 16 corresponding to the thermistor 15. The temperature measuring device 14 has the convex lens 2
It is surrounded by a heat insulating material 21 except for the 0 portion.

An exhaust passage 22 communicating with the outside is formed in the side wall of the cooking chamber 4, and a vapor sensor 23 and an alcohol sensor 24 are provided in the exhaust passage 22. In addition, the panel 2 provided on the front surface of the cooker body 1
5 is provided with various switches 26 and a display 27. Further, a ventilation duct 28 communicating with the heating and cooking chamber 4 is provided in the magnetron 6 portion, and a damper 29 for opening and closing the ventilation duct 28 and a damper motor 30 (see FIG. 5) for controlling the opening and closing of the ventilation duct 28. It is provided.

FIG. 5 shows an electrical configuration, and the control circuit 31 is configured to include an A / D converter and a microcomputer, in which the temperature measuring device 1 is provided.
4, signals from the vapor sensor 23, the alcohol sensor 24, and the various switches 26 are given. Then, the control circuit 31 controls the magnetron 6, the machine room fan motor 9, the oven heater 10, the oven fan motor 11a, and the damper motor 30 via the drive circuit 32 according to the operation program stored therein, and the display unit It is designed to control 27.

Now, in the above configuration, when cooking is started by an appropriate cooking menu of range cooking, the control circuit 3
1 drives the magnetron 6 and the machine room fan motor 9 and drives and controls the damper motor 30 to control the damper 2
Open 9. As a result, the food to be heated in the cooking chamber 4 is heated by the microwave of the magnetron 6, and the magnetron 6 is cooled by the machine room fan 7.
In this case, the temperature measuring device 14 is also cooled by the machine room fan 7.

In the temperature measuring device 14, however, the heat rays from the food to be heated are collected by the convex lens 20 and reach the thermistor 15, whereby the temperature of the food to be heated is detected. The control circuit 31 measures a change in the detected temperature in a predetermined time from the start of the cooking, determines the end time of the cooking according to the degree of the change, and terminates the operation when the end time is completed. There is.

Further, when cooking is started by an appropriate menu of oven cooking, the control circuit 31 causes the machine room fan motor 9, the oven heater 10 and the oven fan motor 1 to operate.
While driving 1a, the damper motor 30 is drive-controlled to close the damper 29. As a result, the food to be heated in the cooking chamber 4 is heated by the hot air generated by the hot air generating device 12, and the temperature measuring device 14 causes the machine room fan 7 to operate.
Is cooled by.

In the temperature measuring device 14, however, the heat rays from the food to be heated are collected by the convex lens 20 and reach the thermistor 15, whereby the temperature of the food to be heated is detected. The control circuit 31 measures a change in the detected temperature in a predetermined time from the start of the cooking, determines the end time of the cooking according to the degree of the change, and terminates the operation when the end time is completed. There is.

According to this embodiment, the temperature sensor serves as a thermistor 15 and the convex lens 2 serves as a heat collecting device.
Since the temperature measuring device 14 provided with 0 is adopted, the temperature of the food to be heated is collected by collecting the heat of the food to be heated in the thermistor 15 by the convex lens 20 while using the thermistor 15 which is a low cost temperature detecting element. Can be measured effectively,
Therefore, the cost of the temperature sensor can be reduced, and the non-contact type can be fixedly used. Therefore, unlike the case of the temperature probe, maintenance is unnecessary. Further, according to the above-mentioned embodiment, since the heating and cooking operation is controlled based on the output of the temperature measuring device 14, the automatic control operation can be performed according to the temperature of the food to be heated.

By the way, there is a concern that the temperature measuring device 14 may be overheated by heat during cooking during range cooking or oven cooking. However, according to the present embodiment, the temperature measuring device 14 is provided with the heat insulating material 21. Since the temperature measuring device 14 is prevented from overheating, the reliability of the temperature sensing operation of the thermistor 15 can be improved and the service life can be extended. Further, according to this embodiment, since the temperature measuring device 14 is cooled by the machine room fan 7, overheating of the temperature measuring device 14 can be more effectively prevented, and the temperature of the heated air in the vicinity of the thermistor 15 can be prevented. Since it is possible to suppress as much as possible, the accuracy of the temperature measured by the thermistor 15 is improved.

Next, a second embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. In this embodiment, the structure of the temperature measuring device 41 is different from that of the first embodiment. In this temperature measuring device 41, a concave mirror 42 is provided as a heat collecting device, and a thermistor 43 is provided at the focal position of the concave mirror 42. Also in this embodiment, the same effect as that of the first embodiment can be obtained.

Further, a third embodiment of the present invention will be described with reference to FIGS. In this embodiment, the configuration of the temperature measuring device 51 and its arrangement position are the first.
Is different from the embodiment described above. That is, this temperature measuring device 51
Is, for example, three thermistors 52a, 52b, 52c.
And three convex lenses 53a, 53b, 5 corresponding to this
And a transparent glass 54 having 3c. In addition, each terminal 55a, 55b, 55c and 55d
Among them, the terminals 55a, 55b and 55c are the output terminals of the thermistors 52a, 52b and 52c, and the terminal 55.
d is a common terminal. The temperature measuring device 51 is arranged on the back side of the upper wall of the cooking chamber 4 so as to face the inside of the cooking chamber 4.

In this embodiment, it is possible to measure the temperatures at a plurality of locations (three locations) of the food to be cooked and to accurately detect the temperature of the food to be cooked.

The present invention is not limited to the above-mentioned embodiment, and it is possible to provide a filter for passing the heat ray on the side facing the food which is not covered with the heat insulating material. Since it becomes easier to detect the heat rays emitted from the food without being affected by the temperature in the vicinity of the thermistor, the temperature detection accuracy can be increased.

The present invention is clear from the above description.
The following effects can be obtained.

Since the temperature sensor is constituted by a temperature measuring device in which a thermistor is provided with a heat collecting device, the thermistor, which is an inexpensive temperature detecting element, can be used to collect the heat of the food to be heated by the heat collecting device. The temperature of the food to be cooked can be effectively measured by collecting the temperature sensor in the temperature sensor, and the cost of the temperature sensor can be reduced, and since it can be used non-contactly and fixedly, no maintenance is required unlike the temperature probe. It can be done.

Further, by controlling the heating and cooking operation based on the output of the temperature measuring device, it becomes possible to perform the automatic control operation according to the temperature of the food to be heated. Temperature measuring device,
With the structure in which the temperature measuring device is surrounded by the heat insulating material, overheating of the temperature measuring device can be prevented, the reliability of the temperature sensing operation of the thermistor can be improved, and the service life can be extended. By providing a plurality of thermistors and heat collecting devices in the temperature measuring device, it is possible to measure the temperature at a plurality of points of the cooked food and to accurately detect the temperature of the cooked food.
By configuring the temperature measuring device to be cooled by the cooling device, overheating of the temperature measuring device can be prevented and the temperature detection accuracy of the temperature measuring device can be improved.

[Brief description of drawings]

FIG. 1 is a vertical plan view of a temperature measuring device showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a heating cooker.

FIG. 3 is a cross-sectional plan view of the heating cooker.

FIG. 4 is a perspective view of the inside of the cooking chamber.

FIG. 5 is a block diagram of an electrical configuration.

FIG. 6 is a diagram equivalent to a diagram showing a second embodiment of the present invention.

FIG. 7 is a view corresponding to the drawing showing the third embodiment of the present invention.

FIG. 8 is a vertical cross-sectional front view of the cooking chamber showing the arrangement of the temperature measuring device.

[Explanation of symbols]

1 is a cooker main body, 4 is a heating cooking chamber, 6 is a magnet (heating means), 7 is a machine room fan (cooling device), 12 is a hot air generator, 14 is a temperature measuring device, 15 is a thermistor, 1
6 is transparent glass, 17 is a package, 20 is a convex lens (heat collecting device), 31 is a control circuit, 41 is a temperature measuring device,
42 is a concave mirror (heat collector), 43 is a thermistor, 51 is a temperature measuring device, 52a, 52b, 52c are thermistors,
Reference numerals 53a, 53b and 53c denote convex lenses.

Claims (7)

[Claims] 1. A temperature sensor comprising a heating means for heating an object to be cooked contained in a heating cooking chamber and a temperature sensor for directly or indirectly measuring the temperature of the object to be cooked. A heating cooker characterized in that the sensor is constituted by a temperature measuring device having a thermistor provided with a heat collecting device. 2. A temperature sensor comprising a heating means for heating an object to be cooked contained in a heating cooking chamber and a temperature sensor for directly or indirectly measuring the temperature of the object to be cooked. A heating cooker characterized in that the sensor is constituted by a temperature measuring device having a thermistor provided with a heat collecting device, and the heating and cooking operation is controlled based on the output of the temperature measuring device. 3. The heating cooker according to claim 1 or 2, wherein the temperature measuring device is surrounded by a heat insulating material. 4. The heating cooker according to claim 1 or 2, wherein the heat collecting device comprises a convex lens. 5. The heating cooker according to claim 1 or 2, wherein the heat collecting device comprises a concave mirror. 6. The cooking device according to claim 1, wherein a plurality of thermistors and heat collecting devices are provided in the temperature measuring device. 7. The cooking device according to claim 1, wherein the temperature measuring device is cooled by a cooling device.