JP3402163B2 - High frequency heating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing an infrared sensor of a high-frequency heating device from erroneously detecting an infrared sensor due to contamination by a heated object. 2. Description of the Related Art Conventionally, to prevent contamination of an infrared sensor of such a high-frequency heating apparatus, there is a structure in which the infrared sensor is sealed with a material that does not affect infrared light. In the case where the inside of the refrigerator is configured as a seal, there is a problem that the sensor does not detect the infrared ray passing surface due to oily smoke generated from the food or dirt of the scattered food. Therefore, it is required to always clean the seal surface through which infrared light passes, and it is said that accurate detection cannot be performed when the seal surface is used in a dirty state. The configuration will be described below with reference to FIG. [0003] As shown in FIG. 3, a waveguide 3 for guiding radio waves is mounted below a heating chamber 2 mounted in a main body 1. A high-frequency oscillator 4 for oscillating radio waves is coupled. High frequency oscillator 4
An antenna 11 for sending a radio wave into the heating chamber 2 is attached to an opening portion of the waveguide 3 to which the heating chamber 2 is coupled. As a result, the radio wave oscillated from the high-frequency transmitter 4 passes through the waveguide 3 and passes through the opening where the waveguide 3 and the heating chamber 2 are connected to each other. Supplied. On the upper part of the antenna 11 of the heating chamber 2, a dish receiver 6 on which the object to be heated 10 is placed is mounted. On the upper machine room side of the heating cabinet 2, an infrared sensor 7 is attached toward the center of the dish tray 6. The opening 8 inside the refrigerator through which infrared light passes is protected by a sealing material 9 that does not affect the transmission of infrared light so that dirt from the refrigerator does not adhere to the infrared sensor 7. [0004] However, in the case of such an infrared sensor in which a sealing material is interposed between the infrared sensor of the conventional high-frequency heating device and the object to be heated, an infrared ray passing surface is generated from the food. The sensor is unable to detect due to the fumes and spilled food. Therefore, it is required to always clean the seal surface through which infrared light passes,
If it is used in a dirty state, accurate detection cannot be performed. Furthermore, when used in a state where it is difficult to detect, there is a problem that the object to be heated is overheated or further burned. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a high-frequency heating apparatus having high reliability by eliminating erroneous detection due to dirt or the like and improving usability. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a heating chamber provided with a ventilation port for heating an object to be heated, a high-frequency oscillator for generating high-frequency power, A dish tray for placing an object, an air guide for convection of air below the top of the heating chamber, a cooling fan, an infrared sensor, and the infrared sensor provided outside the top of the heating chamber; An outer cover provided on the top of the top to protect the object, and protects the air guide, the top plate of the heating chamber and the infrared sensor on the axis connecting the substantially center of the dish tray on which the object to be heated is placed and the infrared sensor. wherein an opening communicating with the exterior cover is detecting the infrared radiation from the heated object, between the top plate and the air guide of the heating housing and configured to vent into the in-compartment from the cooling fan, the Red
Opening of the exterior cover of the outside line sensor and the top plate of the heating chamber
A gap is provided between the openings . [0007] Further, since food dust, oily smoke and the like scattered from the object to be heated in the refrigerator pass between the top surface of the refrigerator and the air guide as a barrier, erroneous detection due to contamination of the infrared sensor portion can be prevented. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating chamber provided with a ventilation hole in a chamber for heating an object to be heated, a high-frequency oscillator for generating high-frequency power, and a tray support for mounting the object to be heated. An air guide for convection of air below the top of the heating chamber, a cooling fan provided outside the top of the heating chamber, an infrared sensor, and an exterior provided on the top of the heating chamber to protect the infrared sensor. A cover is provided, substantially at the center of a dish tray on which the object to be heated is placed, and provided on an axis connecting the infrared sensor with an opening communicating with the air guide, a top plate of the heating chamber, and an exterior cover for protecting the infrared sensor. It is configured to detect infrared rays from the object to be heated, and to allow ventilation between the top plate of the heating chamber and the air guide from the cooling fan into the chamber, and an opening of an exterior cover of the infrared sensor.
A gap is provided between the openings of the top plate of the heating chamber . [0009] Since the air passing through between the top surface of the refrigerator and the air guide becomes a barrier, food dust, oily smoke and the like scattered from the object to be heated in the refrigerator serve as a barrier, so that erroneous detection due to contamination of the infrared sensor can be prevented. [0010] Even when a part of the blown air is discharged from the opening of the top plate of the heating cabinet into the exterior cover for protecting the infrared sensor, the cooling fan in the machine room is used to cool the ceiling of the heating cabinet. By sucking the dirt from the gap between the plate and the outer cover of the infrared sensor, it is possible to further prevent the detection part of the infrared sensor from being stained. Embodiments of the present invention will be described below with reference to the drawings. REFERENCE EXAMPLE 1 As shown in FIG. 1, a door 13 is pivotally supported at an opening on the front surface of a main body 12 having a heating chamber 11 so as to be openable and closable. Body 1
A control panel 14 for operating the heating device is disposed on the front of the device 2. A waveguide 15 is coupled to the bottom of the heating chamber 11, and a high-frequency oscillator 16 for oscillating radio waves is coupled to a distal end on the waveguide machine room side. A motor 18 for rotating an antenna 17 is attached to a lower portion of a tip of the waveguide 15 to which the high-frequency oscillator 16 is coupled, on the side of the heating chamber 11. On the upper part of the antenna 17, a dish tray 20 for mounting the object 19 to be heated is mounted. Air 26 for ventilation in the refrigerator is supplied from the ventilation hole 22 in the refrigerator above the heating refrigerator 11 by driving the cooling fan 27, and the heating refrigerator 1 is heated.
The air 26 flows between the air guide 21 which is detachably provided in the upper part of the inside 1 and the top plate 11a of the heating chamber 11. An infrared sensor 23 and an outer cover 24 for protecting the infrared sensor 23 are provided on the upper side of the heating chamber 11 on the machine room side. The detection unit 25 of the infrared sensor 23 is disposed facing the center of the dish tray 20 on which the object 19 is placed. In order for the infrared sensor 23 to detect infrared rays generated by heating the object 19 to be heated, the air guide 21 and the heating chamber 11 on the axis line connecting the detection unit 25 and the substantially center of the plate holder 20 with a straight line are provided. 23
The openings 21a, 11
b and 24b are provided to detect infrared rays. According to the above configuration, the air 26 supplied from the ventilation hole 22 in the refrigerator is opened by the opening 21 a of the air guide 21.
And between the opening 11b of the top plate 11a of the heating chamber 11 and fed into the chamber, and the heating chamber 1
It is discharged outside. As a result, even if splatters of steam, oil smoke, seasonings, and the like generated from the article to be heated 19 fly toward the detection unit 25 of the infrared sensor 23, the ventilation hole 22 in the refrigerator.
From the air 26. Further, the air 26 supplied from the ventilation hole 22 in the refrigerator is supplied with the air 26 for ventilation in the refrigerator during heating of the article 19 to be heated and for about 60 seconds after the heating is completed. And water and the like are discharged. Embodiment 1 FIG. 2 will be described. The configuration is the same as that of FIG. 1 except that a gap is provided between the top plate 11a of the heating chamber 11 and the outer cover 24 of the infrared sensor 23. Ventilation opening 2
The air 26 supplied from 2 also contains impurities such as oily smoke. Most of the air passes through the heating chamber 11 and is discharged out of the chamber, but a part of the blown air 26 is
Even when it is discharged from the opening 11b of the top plate 11a, the heating chamber 1 is cooled by the cooling fan 27 in the machine room.
1 top plate 11a and exterior body 24 of infrared sensor 23
By suctioning through the gap, the detection unit 25 of the infrared sensor 23 can be further prevented from being stained. As is apparent from the above description, according to the structure of the present invention, since there is no intervening member between the infrared sensor detecting section and the object to be heated, the temperature of the object to be heated can be more accurately determined. Can be detected. Further, since the infrared sensor detecting portion is protected from dirt scattered from the object to be heated by air, there is no need for cleaning or caution.

Illustration of a main portion of a heating apparatus according to the first embodiment of the conceptual diagram invention; FIG explaining a heating apparatus in Reference Example 1 BRIEF DESCRIPTION OF THE DRAWINGS [Figure 1] The present invention Figure 3 of the prior art Conceptual diagram for explaining the heating device [Description of symbols] 11 Heating cabinet 11b Opening 21 Air guide 21a Opening 23 Infrared sensor 24 Exterior cover 24b Opening 25 Detecting unit 22 Ventilation opening in warehouse 27 Cooling fan 19 Heated object 16 High frequency transmitter 20 Dish tray

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24C 7/02 330 F24C 7/02 541 H05B 6/64 H05B 6/68 320

Claims (1)

(57) [Claims] [Claim 1] A heating chamber provided with a ventilation hole in a chamber for heating an object to be heated, a high-frequency oscillator for generating high-frequency electric power, and a pan support for mounting the object to be heated An air guide for convection of air below the top of the heating chamber, a cooling fan provided outside the top of the heating chamber, an infrared sensor, and the infrared sensor are provided above the top to protect the infrared sensor. An outer cover is provided, and substantially at the center of a dish tray on which the object to be heated is placed,
On the axis connecting the infrared sensor, an opening communicating with the air guide and the top plate of the heating chamber and an exterior cover for protecting the infrared sensor is provided to detect infrared rays from the object to be heated, and the top panel of the heating chamber. A configuration in which the space between the air guides is ventilated from the cooling fan into the refrigerator ,
Opening of the exterior cover of the infrared sensor and the ceiling of the heating chamber
A high-frequency heating device with a gap between the plate openings .