JPS6162728A - Electric oven - Google Patents

Abstract

PURPOSE:To enable each of foodstuff materials to be cooked at the most suitable finished state by a method wherein a position of converging plate for converging steam generated from the heated material being heated toward an absolute temperature sensor is changed over in correspondence with the type of the foodstuff material. CONSTITUTION:A discharged steam converging part B for deciding an amount of the discharged steam air flowing toward a temperature detecting sensor is changed over and a sensitivity of the temperature detecting sensor is varied in correspondence with the type of heated material. That is, when the desired one of a group of cooking menu switches 31 in the operation panel 30 corresponding to the heated material and the heating switch 32 are turned ON, an electrical signal is sent to the solenoid 8 in correspondence with the selected cooking menu, a position of the variable part 33 of the discharging steam converging plate is defined as a position X, and then the heating of the heated material is started by the magnetron 4, the steam generated by the heated material is brought by air passed through the punched holes I7 with a high frequendcy fan 6, then passed through the punched holes II2 and a proper amount of steam is abutted against the absolute temperature sensor 1 which is applied in recognition by sensor 1 with the discharged steam converging plate B.

Description

Detailed Description of the Invention (a) Purpose of the Invention [Field of Industrial Application] This invention relates to a microwave oven, and in particular to a microwave oven that uses a humidity sensor to optimally control the finish of a heated object. Regarding.

(Prior Art) In terms of its functionality, it is extremely important for a microwave oven to accurately detect the cooking state of the object being heated.For example, in Fig. 6, the conventional microwave oven (Ra) As a method of detecting the cooking state of the heated object in the air during heating operation, an absolute concentration sensor (1a) is provided in the exhaust duct (Da) through which steam generated from the heated object is exhausted, and this sensor (1a) At this time, the convergence plate (Ba) that brings the exhaust steam into contact with the absolute humidity sensor (1a) is fixed inside the exhaust duct (Da), and the area near this sensor (1a) is The mouth of the flowing exhaust steam wind was always constant.

[Problem that the invention seeks to solve]

By the way, when cooking an object to be heated, for example, as shown in FIG. 4, the sensor output P with respect to the heating time T of the object is
The type of object to be heated is recognized based on the difference in the pattern, and based on this, the heating time is determined so that heating is completed in an optimal finished state.

Furthermore, the group of exhaust vapor pressure flowing near the sensor (1a) is determined by the position of the focusing plate (Ba), as shown in FIG. In other words, the exhaust steam pressure from the heating point (Ca) passes through the punching part II (2a) and into the exhaust duct (Da
), but the punching part If (2a) is divided into area ■ (36a) and area ■ (37
a), it is divided into flow A and flow B, of which flow A flows near the sensor (1a). The sensitivity of the sensor (1a) is determined by the exhaust steam wind of m, which is the flow A.

Now, the flow A of the exhaust steam wind that determines the sensor sensitivity depends on the position of the convergence plate (Ba).
For example, as shown in Figure 5, the position of a) does not always provide a pattern with good sensitivity that makes it easy to recognize the type of object to be heated, but rather is determined to reduce sensitivity to some extent. .

However, in cases like Chawanmushi, where cooking cannot be achieved to the optimum finish unless the heating time is determined based on a high sensor sensitivity, there is a problem of inconvenience.

This invention was made in consideration of these backgrounds,
The sensor (1a) can always output a detection signal with appropriate sensitivity so that the optimal finished state is achieved according to the type of the object to be heated, and thereby the object to be heated can be properly heated and cooked. purpose.

(0) Structure of the Invention This invention includes a high-frequency supply means consisting of a high-frequency generator and a high-frequency fan that supply high-frequency waves into a heating chamber formed in the main body of the device, and a high-frequency supply means that supplies high-frequency waves into a heating chamber by using the function of the high-frequency fan. a steam exhaust path capable of discharging generated steam;
A humidity detection sensor placed in this steam exhaust path,
An exhaust convergence plate is provided in the vicinity of the humidity detection sensor in the steam exhaust path and determines m of the exhaust steam wind flowing to the humidity detection sensor, and a high frequency supply means is provided based on the detection signal from the humidity detection sensor. control means for controlling the operation of the heated object to bring the heated object into a predetermined finished state; This microwave oven is equipped with a switching means, and is configured so that the sensitivity of a humidity detection sensor can be changed by switching the switching means in accordance with the type of object to be heated.

(Example) The present invention will be described below using examples shown in FIGS. 1 to 4, but the invention is not limited thereby.

First, referring to FIG. 2, the structure of the microwave oven (R) will be explained. 0! A heating device (C) is placed inside the vessel body, and a turntable (3) on which the object to be heated is placed inside this heating device (C).
, a magnetron (4) that generates high frequency waves, and a waveguide (
5) and a high-frequency fan (6) that guides the high-frequency waves generated by the magnetron (4) to heating = (C) through this waveguide.
), and a punching part ■(
7I, an exhaust duct (D) that exhausts the steam air generated from the heated object to the outside, and an absolute sensor that is installed inside the exhaust duct (D) and detects the absolute amount of humidity contained in the exhaust steam air. A humidity sensor (1), a movable exhaust converging plate (B) through which the exhaust vapor pressure is variably passed near the absolute humidity sensor (1), and an exhaust duct (D) from the heating 'J (C).
), a solenoid (8) connected to the exhaust convergence plate (B) and serving as a switching means for changing the position of the exhaust convergence 1 (B) using an electric signal; Absolute humidity sensor (1) and solenoid (8
) is activated to heat W(C) from a predetermined amount of exhaust steam pressure.
detects the internal humidity of the magnetron (4).
and a control means (9) for operating a high frequency fan (6) to bring the object to be heated into a predetermined finished state.

Next, using FIG. 3, the above-mentioned control tI11 means (9) will be specifically explained. The absolute humidity sensor (1) consists of a first series circuit plane consisting of an open type thermistor (1) exposed to the atmosphere and a closed type thermistor (1) sealed in dry air, and two resistors [13 ) (141) are connected in parallel to form a bridge circuit L) whose respective midpoints σ7) f'18) output terminals connect to each input section -10 of the comparator amplifier S. each connected to h4
＋To be decapitated. First series circuit plane and second series circuit f151
The direct IA'iI3 source of the absolute humidity sensor (1) is connected to the connection part (21) with the current limiting resistor.

24+ is a heating control circuit including RAM1CPU and ROM, and this heating control circuit 24+ responds to the absolute humidity detection signal VAH from the absolute humidity sensor (1) provided through the A/D converter and the interface. The heating time of the object to be heated is controlled.

27) is a magnetron (
This is a switch circuit that controls the drive power to the microwave generation circuit (to) including (4). This is the drive T18! This is a power outlet for receiving electricity. Field is the operation panel,
C31) is a cooking menu switch group, and ■ is a heating switch.

In addition, the exhaust duct (D) has a punching part (D) that communicates with the inside of the heated seedling (C), as shown in Figure 1.
z, the variable head that changes position on this punching part II (2), the fixed part (3) fixed to the bottom plate of the exhaust duct by spot welding, etc., and the variable part to this fixed part (to) can be rotated. An exhaust convergence plate (B) consisting of a connecting hinge part (G), and a solenoid (8) which is connected to the exhaust convergence plate variable Miyakoda and changes the position of this variable part from ■→■ or ■→■ by an electric signal. , and an absolute humidity sensor (1) that detects the amount of absolute humidity contained in the exhaust steam air.

Since this microwave oven (R) is configured as described above, it is possible to heat the object to be heated (for example, food B or food C). ! ? Put it in 11F (C), close the door, and turn on one of the cooking menu switches (Gl) on the operation panel provided on the front of the device that corresponds to the object to be heated, and then turn on the heating switch. , an electric signal is sent to the solenoid (8) according to the selected cooking menu, the position of the variable part of the exhaust convergence plate (B) is set to HI, and then the object to be heated is heated by the magnetron (4). The steam generated from the heated object is carried by the wind passing through the punching section I (7) by the high frequency fan (6), passes through the punching section Part of it (1 server (1) recognizes): appropriate m
) corresponds to the absolute humidity sensor (1). Thus, upon receiving the detection signal from this sensor (1), the control means (9)
The relationship between the heating time T and the sensor output P, for example, the type of the object to be heated is recognized as in the pattern of food B or food C shown in FIG. 4, and the high frequency supply means is operated for the optimum heating time for that type.

On the other hand, the food to be cooked is, for example, food A such as Chawanmushi.
In this case, the position of the exhaust convergence plate (B) is changed to position f by operating the corresponding cooking menu switch group (31).
f1Ir, and the sensitivity of sensor (1) is increased. Thus, upon receiving the detection signal from the sensor (1), the control means (9) applies a predetermined heating rf corresponding to the food A.
The food A is cooked to the optimum finished state by instructing the high frequency supply means to move between T.

(c) Effects of the Invention The microwave oven of the present invention has an operation in which the position of the convergence plate that converges the steam generated from the object being heated in one direction of the absolute humidity sensor is changed according to the type of the object to be heated. By making this possible, the sensitivity of the absolute humidity sensor that detects zero steam from the heated object can be changed, thereby allowing each heated object to be cooked to an optimal finished state.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the essential vAI of the microwave oven of the present invention, Fig.
The figure is a perspective view of the main parts of this, Figure 3 is a circuit diagram of the high frequency heating device, Figures 4 and 5 are diagrams explaining the relationship between heating time and sensor output P, and Figure 6 is a conventional FIG. 2 is a sectional view of main parts of a microwave oven. (R)...Microwave oven, (D)...Exhaust duct, (B)...Exhaust convergence plate, (C)...
...Heating up, (1)... Absolute humidity level -
1 (2... Punching part ■, (3)...
・Turntable, (4)... Magnetron,
(5)... Waveguide, (6)... High frequency fan, (71... Punching il I,!
81...Solenoid, (9)...vj
rn means, ω... thermistor, ('lυ...
...Thermistor■, ■...First series circuit,
(13)・・・Resistance, figure)・・・Resistance, 6
...Second series circuit, (Company)...Bridge circuit, a force...Middle point, □□□...Middle point, 8... ... Comparison amplifier, ■ ... Connection section, r21) ... Connection P section, Capacity ... Current limiting resistor, Field ... DC power supply, □ □□・・・・・・
Heating control wJ circuit, A/D converter, country...
-...Interface, ^...Switch circuit, (to)...Microwave generation circuit, prisoner...
・-! ffl outlet, field...operation panel, (111-...cooking menu switch group, country/
... Heating switch, can ... Exhaust convergence plate variable part, diagram ... Exhaust convergence foot part, can ...
・Hinging part, round... Area work, closing...
Area ■. Figure 1 Figure 4 P Figure 6

Claims (1)

[Claims] 1. High-frequency supply means consisting of a high-frequency generator and a high-frequency fan that supply high-frequency waves into the heating chamber formed in the main body of the device, and steam generated from the object to be heated in the heating chamber can be discharged using the function of the high-frequency fan. A steam exhaust path, a humidity detection sensor placed in the steam exhaust path, and a sensor installed near the humidity detection sensor in the steam exhaust path to detect the amount of exhaust steam air flowing to the humidity detection sensor. and a control means for controlling the operation of the high-frequency supply means to bring the object to be heated to a predetermined finished state based on a detection signal from a humidity detection sensor, and switching and moving the exhaust convergence plate, Equipped with a switching means for the exhaust convergence plate that can change the amount of exhaust steam air flowing to the humidity detection sensor, and by switching the switching means according to the type of object to be heated, A microwave oven configured so that the sensitivity of the sensor can be changed.