JP2003074865A - Combined cooking appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combined cooking appliance, in which overheating of a humidity sensor is prevented, and the durability is improved. SOLUTION: In an exhaust duct 5, there are provided a thermistor 26 for detecting temperature of flue gas, a humidity sensor 27 for detecting a generation amount of steam. The sensor 27 is fixed on an attachment piece 28, which is provided in an inner heat-insulation sheet 21 in the upper part of a heating chamber 2 along the upper wall 5a of the duct 5. The tip end of the sensor 27 including the sensor face is passed partly through a through hole 29 made nearly in the middle of the upper wall 5a, and is protruded into the exhaust duct 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined heating having a microwave oven function of heating an object to be cooked in a heating chamber by electromagnetic waves and a gas oven function of placing the object to be cooked on an oven dish and heating it by a burner. Regarding cooking equipment.

[0002]

2. Description of the Related Art In the above-described combined cooking apparatus, a humidity sensor is used to detect the finish of microwave cooking. This humidity sensor is often provided in an exhaust passage connected to a heating cabinet for gas oven cooking in order to avoid the influence of electromagnetic waves during microwave oven cooking.
Even if it is provided in the exhaust passage, it becomes a vent hole for the air in the heating chamber that has been volume-expanded due to the generation of water vapor when the microwave oven is used, and the amount of water vapor generated can be detected.

[0003]

However, when the humidity sensor is arranged in the exhaust passage, the humidity sensor is overheated by being exposed to the high temperature exhaust gas passing through the exhaust passage during the gas oven cooking. Deterioration, damage, etc. are likely to occur in a heat-sensitive portion such as a lead wire, which lowers durability.

Therefore, according to the first aspect of the present invention, even if the humidity sensor is arranged in the exhaust passage, overheating of the humidity sensor due to exhaust gas can be effectively suppressed and durability can be improved. The purpose is to provide a device.

[0005]

In order to achieve the above object, the invention according to claim 1 is such that a humidity sensor is arranged outside an exhaust passage provided in a heating chamber and includes a sensor surface. Only the part is projected into the exhaust passage. In addition to the object of claim 1, the invention according to claim 2 further comprises a humidity sensor, a heat shield plate provided on the outer periphery of the heating chamber, in order to easily dispose the humidity sensor outside the exhaust passage. It is installed by using it. In addition to the object of claim 1 or 2, the invention according to claim 3 is a circulation fan that circulates air in a heating chamber, and a circulation fan for the circulation fan in order to more effectively suppress overheating of the humidity sensor. The motor cooling fan is provided with an air passage for guiding an air flow generated by the cooling fan to the humidity sensor.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a lateral cross-sectional explanatory view of a combination range 1 as a combined heating and cooking apparatus, and FIG. 2 is a vertical cross-sectional explanatory view of the combination range 1. Stow,
Combustion chamber 3 that houses a substantially cubical heating chamber 2 that houses a turntable 8 on which a range dish is placed, and a burner 4 that is adjacent to the left and right outside below the heating chamber 2 and that burns fuel gas.
An exhaust duct 5 that is provided at the center of the upper portion of the rear wall of the heating cabinet 2 and forms an exhaust passage, and an opening / closing door 6 that can open and close the heating cabinet 2 on the front surface of the heating cabinet 2.

As shown in FIG. 3, an upper wall 2a of the heating chamber 2 and an upper heat shield plate 9 arranged in parallel with the upper wall 2a at a predetermined interval are provided above the heating chamber 2. , Insulation space 10
Are formed. Further, a magnetron (not shown) that oscillates electromagnetic waves behind the heating chamber 2 is provided above the heating chamber 2,
A waveguide 11 that guides an electromagnetic wave from the magnetron to the center of the upper surface of the heating cabinet 2 and a lamp 12 that illuminates the inside of the cabinet are provided. 13 is a controller disposed outside the heating chamber 2 in the lower rear part of the exhaust duct 5, and controls combustion of the burner 4 and each motor to be described later, and 14 is projecting above the exhaust duct 5 to the body. It is the exhaust stack.

On the other hand, in the upper part of each combustion chamber 3, the suction passage 16 communicating with the heating chamber 2 by the suction ports 15, 15 ... Bored in the side wall 2b of the heating chamber 2, and the suction passage 16 from the outside. A blowout passage 18 that communicates with the heating cabinet 2 through the cover and the blowout ports 17, 17 ... Is provided, and a circulation fan 19 that circulates the inside air and the combustion gas from the burner 4 is provided in the blowout passage 18. . The fan motor 20 for driving the circulation fan 19 includes an inner heat shield plate 21 provided outside the blowout passage 18 and an outer heat shield plate 22 arranged in parallel with the inner heat shield plate 21 at a predetermined interval. Further, the cooling fan 23 is arranged on the outer side and the output shaft thereof is provided between the inner heat shield plate 21 and the outer heat shield plate 22.

The inner heat shield plate 21 and the outer heat shield plate 22 extend upward along the blow-out passage 18, and extend around the heating cabinet 2 to form a ventilation passage 24 that opens toward the exhaust duct 5. The inner heat shield plate 21 forms a heat shield space 25 that is not sealed between the inner heat shield plate 21 and the upper heat shield plate 9. Therefore, when the cooling fan 23 rotates, air is taken from the outside of the outer heat shield plate 22 into the ventilation passage 24, is raised in the ventilation passage 24, and is discharged toward the exhaust duct 5, and the exhaust pipe 14 is used to A flow of air to be discharged to the outside is formed. The fan motor 20 is cooled by this air flow.

A thermistor 26 for detecting the temperature of the combustion exhaust gas and a humidity sensor 27 for detecting the amount of water vapor generated are provided in the exhaust duct 5. As shown in FIG. 3, the humidity sensor 27 includes the exhaust duct 5 on the inner heat shield plate 21.
The exhaust duct 5 is fixed to a mounting piece 28 extending along the upper wall 5a, and only a part of the tip including the sensor surface is passed through a through hole 29 formed substantially in the center of the upper wall 5a. It is projected inside. Therefore, the air discharged from between the inner heat shield plate 21 and the outer heat shield plate 22 through the ventilation path 24 is guided to the exhaust pipe 14 side along the attachment piece 28 and discharged to the outside of the body. It will be.

In the combination range 1 constructed as described above, the opening / closing door 6 is used when cooking in the oven.
When the operation button for oven cooking is closed and the lamp is turned on to illuminate the inside of the refrigerator, the circulation fan 19 is closed.
Operates to supply primary air and secondary air for combustion to the burner 4 from outside the body, and at the same time, fuel gas is supplied to the burner 4 to ignite and start combustion. The combustion gas generated is
The air is sucked into the circulation fan 19 through the suction passage 16 and mixed with the air in the heating chamber 2 sucked from the suction ports 15, 15 ... , 17 ... Is sent to the inside of the heating chamber 2 and is again sucked from the suction ports 15, 15 ... To the suction passage 16 and circulates between the inside of the heating chamber 2 and the circulation fan 19, and the oven plates 7, 7 Cook the above cooked food. After that, the hot air mixture is discharged to the outside of the body through the exhaust duct 5 and the exhaust pipe 14, as shown by the solid arrow in FIG.

At this time, the humidity sensor 27 comes into contact with the mixed hot air passing through the exhaust duct 5, but the humidity sensor 2
Since only a part of the sensor 7 including the sensor surface projects into the exhaust duct 5, the humidity sensor 27 is prevented from being overheated and the lead wires 30 and 30 are also protected. The mixed hot air passing through the exhaust duct 5 mainly flows along the upper wall 5a of the exhaust duct 5, but due to the flow of the mixed hot air passing through the exhaust duct 5, as shown by a dotted arrow, the heat shield space 25 However, since the air flow is generated and the humidity sensor 27 and the mounting piece 28 are cooled, the temperature rise of the humidity sensor 27 can be suppressed.
In addition, as described above, the air flow generated by the cooling fan 23 rises along the attachment piece 28 as indicated by the one-dot chain line arrow and is discharged from the exhaust pipe 14, so that the humidity sensor 2
Since 7 and the attachment piece 28 are cooled, the effect of preventing overheating of the humidity sensor 27 is further enhanced.

As described above, according to the above embodiment, the humidity sensor 27 is disposed outside the exhaust duct 5 forming the exhaust passage, and only a part including the sensor surface is projected into the exhaust duct 5. Therefore, it is possible to effectively prevent the humidity sensor 27 from overheating. Therefore, the heat-sensitive portion such as the lead wire is effectively protected, and the durability of the humidity sensor 27 is improved. Further, since the humidity sensor 27 is attached using the upper heat shield plate 9 provided on the outer periphery of the heating chamber 2, the humidity sensor 27 can be easily arranged outside the exhaust passage. Further, by forming the ventilation path 24 for guiding the air flow generated by the cooling fan 23 to the humidity sensor 27, the effect of preventing overheating of the humidity sensor 27 by the cooling air is further enhanced, which leads to further improvement in durability.

It should be noted that the mounting configuration of the humidity sensor can be changed outside the exhaust passage without using a heat shield plate or mounting piece, for example, by directly mounting it on the back of the upper wall of the exhaust duct. Is.

[0015]

According to the first aspect of the invention, the humidity sensor is arranged outside the exhaust passage provided in the heating chamber, and only a part including the sensor surface is projected into the exhaust passage. This makes it possible to effectively prevent the humidity sensor from overheating.
Therefore, heat sensitive parts such as lead wires are effectively protected,
The durability of the humidity sensor is improved. According to the invention described in claim 2, in addition to the effect of claim 1, the humidity sensor is attached using the heat shield plate provided on the outer periphery of the heating chamber, so that the outside of the exhaust passage of the humidity sensor Can be easily arranged. According to the invention described in claim 3, in addition to the effect of claim 1 or 2, there is provided a circulation fan for circulating the air in the heating chamber, and a fan for cooling the motor of the circulation fan. As a result, by forming the ventilation path for guiding the air flow generated by the cooling fan to the humidity sensor, it is possible to more effectively suppress overheating of the humidity sensor.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a combination range.

FIG. 2 is a vertical cross-sectional explanatory view of a combination range.

FIG. 3 is an enlarged explanatory view of an exhaust duct portion.

[Explanation of symbols]

1 ... Combination range, 2 ... Heating chamber, 3 ...
Combustion chambers, 4 burners, 5 exhaust ducts, 14 exhaust stacks, 19 circulation fans, 20 fan motors, 2
1 ... Inner heat shield, 22 ... Outer heat shield, 23 ... Cooling fan, 24 ... Ventilation passage, 27 ... Humidity sensor, 28 ...
Mounting piece.

Claims (3)

[Claims] 1. A microwave oven function capable of heating an object to be cooked in a heating chamber by electromagnetic waves and a gas oven function capable of heating the cooking item by a burner, and the heating chamber for controlling the microwave oven function. A composite heating and cooking apparatus comprising a humidity sensor for detecting the humidity inside, wherein the humidity sensor is arranged outside an exhaust passage provided in the heating chamber, and only a part including a sensor surface is exhausted. A composite heating and cooking device characterized by being projected into a passage. 2. The combined cooking apparatus according to claim 1, wherein the humidity sensor is attached by using a heat shield plate provided on the outer periphery of the heating chamber. 3. A circulating fan that circulates air in a heating chamber and a cooling fan for a motor of the circulating fan, which guides an air flow generated by the cooling fan to a humidity sensor. The combined heating and cooking device according to claim 1 or 2, wherein an air passage is formed.