JPH0726604U - High frequency heating device - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Rotating the stirrer fan using the ventilation air of the ventilation fan, eliminating the need for a dedicated drive motor, and devising the installation position, heating unevenness by microwave To eliminate. A turntable driven by a turntable motor 17 at the bottom of the heating chamber, a magnetron 14 that radiates microwaves in the heating chamber, and ventilation for cooling 14 in one side space of the heating chamber. Fan 8
High-frequency heating device comprising a ventilation air inlet for introducing ventilation air after cooling 14 into the heating chamber, and an exhaust duct 28 for discharging ventilation air introduced into the heating chamber to the outside through the ventilation inlet. In the above, the ventilation air introduction port into the heating chamber is opened in the same direction as the microwave radiation port 13 of 14, and the exhaust duct is provided at a position facing the microwave radiation port 13 of the magnetron 14, and the exhaust duct 2
A stirrer fan 23, which is rotated by the ventilation air, is provided in the inside of 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high frequency heating device including a stirrer fan.

[0002]

[Prior art]

 Generally, in a high-frequency heating device such as a microwave oven, for example, a stirrer fan having a plurality of microwave reflecting blades is used to radiate microwaves in order to uniformly disperse the microwaves radiated from the magnetron into the heating chamber. It is being dispersed evenly in the heating chamber.

Many stirrer fans in the conventional high-frequency heating device are generally provided on the ceiling of the heating chamber, and each have a drive motor independently and are rotationally driven at a rotational speed different from that of the turntable. It was like this.

[0004]

[Problems to be solved by the device]

 However, in the conventional high-frequency heating device, since the stirrer fan is driven independently as described above, a dedicated drive motor is required, resulting in high cost and power consumption. there were.

Further, for example, in the case of a high-frequency heating device having an oven function, since a heater is generally provided in the ceiling part of the heating chamber, it is difficult to secure a space for installing the stirrer fan. Even if it is possible, there is a problem that the blade of the stirrer fan becomes an obstacle that blocks the radiation of heat from the heater.

[0006]

[Means for Solving the Problems]

 The inventions according to claims 1 and 2 of the present application have been made for the purpose of solving the above problems, and are configured as follows.

(1) Structure of the Invention According to Claim 1 A high-frequency heating device according to this invention is provided at a bottom portion of a heating chamber and is provided with a turntable driven by a turntable motor and one side portion of the heating chamber. A magnetron that is provided to radiate microwaves in the heating chamber, a ventilation fan that is provided at one side of the heating chamber and that cools the magnetron by introducing outside air, and a ventilation after cooling the magnetron by the ventilation fan. A high-frequency heating device comprising: a ventilation air inlet for introducing air into the heating chamber; and an exhaust duct for discharging ventilation air introduced into the heating chamber to the outside through the ventilation air inlet. A stirrer fan is rotatably provided below the turntable coaxially with the turntable, and the ventilation air inlet to the heating chamber is provided at the bottom of the heating chamber. It is characterized in that the stirrer fan is rotated by the ventilation air introduced into the heating chamber from the ventilation air inlet at the bottom of the heating chamber.

(2) Structure of the Invention According to Claim 2, The high-frequency heating device of this invention is provided at the bottom of the heating chamber and is provided with a turntable driven by a turntable motor and one side of the heating chamber. A magnetron that is provided to radiate microwaves in the heating chamber, a ventilation fan that is provided at one side of the heating chamber and that cools the magnetron by introducing outside air, and a ventilation after cooling the magnetron by the ventilation fan. A high-frequency heating device comprising: a ventilation air inlet for introducing air into the heating chamber; and an exhaust duct for discharging ventilation air introduced into the heating chamber to the outside through the ventilation air inlet. The ventilating air inlet to the heating chamber is opened in the same direction as the microwave radiating port of the magnetron, and the exhaust duct is radiating microwaves of the magnetron. The feature is that the stirrer fan is installed at the position facing the outlet and is rotated by the ventilation air in the exhaust duct.

[0009]

[Action]

 The inventions according to claims 1 and 2 of the present application have the following operations corresponding to the above-mentioned configurations.

(1) Operation of the Invention According to Claim 1 As described above, in the structure of the high-frequency heating device of the invention, a stirrer fan is rotatably provided below the turntable coaxially with the turntable and the heating chamber is provided. A ventilation air inlet to the inside of the heating chamber is provided at the bottom of the heating chamber, and the stirrer fan is rotated by the ventilation air of the ventilation fan introduced from the ventilation air inlet at the bottom of the heating chamber toward the upper side of the heating chamber. The effective reflection and dispersion of microwaves radiated from the magnetron into the heating chamber.

(2) Operation of the invention according to claim 2 In the configuration of the high-frequency heating device according to this invention, the inlet of ventilation air from the ventilation fan into the heating chamber is opened in the same direction as the microwave radiation port of the magnetron. An exhaust duct that discharges ventilation air from the heating chamber to the outside is provided at a position facing the microwave radiation port of the magnetron, and a stirrer that is rotated by the ventilation air discharged from the heating chamber inside the exhaust duct. By providing a fan, the microwave radiated from the magnetron into the heating chamber is effectively reflected and dispersed.

[0012]

[Effect of device]

 As a result of the above, according to the invention described in each of claims 1 and 2 of the present application, the following effects are obtained respectively.

(1) Effect of the Invention According to Claim 1 Since the stirrer fan is rotated by utilizing the ventilation air of the ventilation fan originally provided, an independent dedicated drive motor is not required, which reduces product cost and Power consumption is also reduced.

Since the stirrer fan is provided coaxially in the radial direction below the turntable by utilizing a large spare space, there is no restriction on the space factor in installing the stirrer fan, and the radiant heat from the heater in the ceiling part is not limited. It does not interfere with radiation.

Further, as a result, the diameter of the stirrer fan can be formed to be a diameter sufficiently close to the diameter of the turntable, and the stirrer fan can be located in a region near the cooked object where a large amount of microwave radiation occurs Combined with this, the microwave reflection / dispersion effect can be greatly improved.

(2) Effect of the invention according to claim 2 Since the stirrer fan is rotated by utilizing the ventilation air of the ventilation fan originally provided, an independent dedicated drive motor becomes unnecessary, resulting in a reduction in product cost and Power consumption is also reduced.

Since the microwave radiation port of the magnetron and the stirrer fan face each other across the heating chamber space, the efficiency of microwave reflection by the stirrer fan is high, and the microwaves are more evenly dispersed in the heating chamber. Therefore, the effect of eliminating heating unevenness is enhanced.

Since the ventilating air inlet to the heating chamber and the exhaust duct are substantially opposite to each other, the flow of the ventilation air from the heating chamber to the exhaust duct is also smooth, and the rotatability of the stirrer fan is improved. It is effective in improving the reflection efficiency of microwaves.

Further, the generated steam in the heating chamber can be efficiently supplied into the exhaust duct, and the humidity detection accuracy when the humidity sensor is provided in the exhaust duct is improved.

[0020]

【Example】

 (1) Embodiment of the invention described in claim 1 (first embodiment) FIGS. 1 to 3 show the configuration of a high-frequency heating apparatus according to an embodiment of the invention described in claim 1 of the present application.

In the figure, reference numeral 1 is provided with a top plate 1a, a bottom plate 1b, a left side plate 1c, a right side plate 1d, and a back plate 1e which are integrated with each other, and an opening surface of a predetermined size is formed on the front side. A box-shaped outer casing of the apparatus, and a door 16 is provided on the front side opening surface of the outer casing 1 so as to be vertically openable and closable via a lower hinge mechanism.

Reference numeral 3 denotes an inner casing (heating chamber casing) provided inside the outer casing 1, and the inner casing 3 includes a top plate 3a, a bottom plate 3b, a left side plate 3c, and a right side plate. 3d, the back plate 1e of the outer housing 1 is joined and integrated with each other to form a box shape, and the inner space thereof is configured as a heating chamber 2. At the same time, the front side opening 9 is formed as an opening for taking in and out the food.

Further, between the right side plate 1d of the outer casing 1 and the right side plate 3d of the inner casing 3 and between the left side plate 1c of the outer casing 1 and the left side plate 3c of the inner casing 3 respectively, First and second hollow portions 4 and 5 are formed.

A ventilation fan 8, a magnetron 14, a duct 10, and a high-voltage transformer 24 are provided in the first cavity portion 4, respectively.

First, the ventilation fan 8 is fixed to the back side of the cavity 4 on the front side (inner side) of the back plate 1e of the outer housing 1 through the fan motor 7 in the front-rear direction. External air is sucked in through an external air inlet 6 formed in 1e to blow ventilation air (cooling air) toward the magnetron 14 and the duct 10 described below.

Next, the duct 10 is located on the downstream side of the ventilation fan 8 and is attached to the right side plate 3d of the inner housing 3, and the magnetron supporting portion 10a and the magnetron supporting portion 10a Also extends to the downstream side of the ventilation air and communicates laterally into the heating chamber 2 via the first ventilation air inlet 12 formed in the right side plate 3d of the inner housing, and the magnetron support. The second ventilation air inlets 15a, 15a formed by arranging in a T-shape on the bottom plate 3b of the inner casing 3 extending downward from the portion 10a and further wrapping around to the back side of the heating chamber 2 ... And a second duct portion 10c that communicates with the inside of the heating chamber 2 from below. In the second duct portion 10c, a ventilation air blowing passage 15 reaching the second ventilation air introducing ports 15a, 15 ... Is formed.

Further, the magnetron 14 is located between the ventilation fan 8 and the duct 10, and has a front end side microwave radiation part 14 a formed on the right side plate 3 d of the inner housing 3. It is supported and fixed by the right side plate 3d of the internal housing 3 and the magnetron supporting portion 10a of the duct 10 while facing the inside of the heating chamber 2 through the port 13.

Therefore, the ventilation air blown by the ventilation fan 8 enters the upstream side of the duct 10 after cooling the magnetron 14, and further the first and second duct portions 10b, 10c side. ., And is introduced into the heating chamber 2 from the first and second ventilation air inlets 12, 15a, 15 ...

The high-voltage transformer 24 is installed at the bottom of the first hollow portion 4.

On the other hand, the second cavity 5 is provided with an exhaust duct 28 for discharging the blast air introduced into the heating chamber 2 as described above to the outside. The exhaust duct 28 is a cylindrical body having a first exhaust port 26 formed in the left side plate 3c of the inner casing 3 and a second exhaust port 27 formed in the left side plate 1c of the outer casing 1. They are formed by being connected to each other, and an exhaust passage 28a is formed inside thereof. Then, a humidity sensor is installed in the exhaust passage 28a with the sensor section facing the need, if necessary.

On the other hand, reference numeral 20 is a turntable 20 provided at the bottom of the heating chamber 2, and the turntable 20 is provided with a rotary shaft 18 of a turntable motor 17 provided at the bottom of the outer casing 1. It is rotatably supported on the upper side through a support bracket 19. On the turntable 20, a glass plate 21 for placing food is placed.

Further, as shown in FIG. 2, reference numeral 23 is a stirrer fan including a plurality of microwave reflecting blades having a diameter substantially equal to the diameter of the turntable 20, and the stirrer fan 23 is the turntable fan. On the lower side of the table 20, a rotary shaft 18 of the turntable motor 17 is loosely fitted and supported via a spacer 22 for height setting. Between the spacer 22 and the central boss portion of the stirrer fan 23, ball bearings 11, 11 ... For reducing frictional force during rotation are interposed.

The stirrer fan 23 is arranged above the second ventilation air inlets 15a, 15a, ... Formed in a T shape on the bottom plate 3b of the inner casing 3 at the bottom of the heating chamber 2. It is rotated at a predetermined speed higher than that of the turntable 20 by the ventilation air from the ventilation fan 8 blown toward the.

As a result, the microwaves radiated from the microwave radiation port 13 of the magnetron 14 toward the lower turntable 20 and the top plate 3a of the inner housing 3, the left and right side plates 3c, 3d, and the outer housing 1 The microwaves reflected from the back plate 1e and the like toward the turntable 20 are further reflected upward by the blades of the stirrer fan 23 so that they are evenly dispersed in the heating chamber 2 and the cooked product is placed thereon. It acts uniformly on each part of the food on the table glass 21. Therefore, the uneven heating as in the conventional case is eliminated.

Further, in the above case, since the stirrer fan 23 is rotated by the ventilation wind of the ventilation fan 8, the dedicated drive motor as in the conventional case is not required, which can contribute to the reduction of the product cost. At the same time, power consumption is reduced.

Further, in the above configuration, the stirrer fan 23 is provided by utilizing the wide spare space in the radial direction below the turntable 20 and by utilizing the rotating shaft 18 of the turntable motor 17, so that the stirrer fan 23 is provided. The diameter of the blade of 23 can be formed to be large enough to cover the entire inner bottom of the heating chamber 2, so that the microwave reflection and dispersion efficiency becomes very high and the installation thereof becomes easy.

In addition, even when a heater is provided on the ceiling to constitute a microwave oven, the radiant heat is not hindered.

(2) Embodiment of the Invention According to Claim 2 (Second Embodiment) FIG. 4 shows the configuration of a high-frequency heating apparatus according to an embodiment of the invention according to claim 2 of the present application.

In the figure, reference numeral 1 is provided with a top plate 1a, a bottom plate 1b, a left side plate 1c, a right side plate 1d, and a back plate 1e which are integrated with each other, and an opening surface of a predetermined size is formed on the front side. A box-shaped outer casing of the apparatus, and a door 16 is provided on the front side opening surface of the outer casing 1 so as to be vertically openable and closable via a lower hinge mechanism.

Reference numeral 3 is an inner housing (heating chamber housing) provided inside the outer housing 1. The inner housing 3 includes a top plate 3a, a bottom plate 3b, a left side plate 3c, and a right side plate. 3d, the back plate 1e of the outer housing 1 is joined and integrated with each other to form a box shape, and the inner space thereof is configured as a heating chamber 2. At the same time, the front side opening 9 is formed as an opening for taking in and out the food.

Further, between the right side plate 1d of the outer casing 1 and the right side plate 3d of the inner casing 3 and between the left side plate 1c of the outer casing 1 and the left side plate 3c of the inner casing 3 respectively, First and second hollow portions 4 and 5 are formed.

A ventilation fan 8, a magnetron 14, a duct 30, and a high-voltage transformer 24 are provided in the first cavity portion 4, respectively.

First, the ventilation fan 8 is fixed to the back side of the cavity 4 on the front side (inner side) of the back plate 1e of the outer housing 1 through the fan motor 7 in the front-rear direction. External air is sucked in from the outside air inlet 6 formed in 1e, and ventilation air (cooling air) is blown toward the magnetron 14 and the duct 30 described below.

Next, the duct 30 is located on the downstream side of the ventilation fan 8 and is attached to the right side plate 3d of the inner housing 3, and is connected to the magnetron support portion 30a and the magnetron support portion 30a. Is also formed from a duct portion 30b which extends to the downstream side of the ventilation air and which communicates with the inside of the heating chamber 2 through the ventilation air inlet 32 formed in the right side plate 3d of the inner casing. A ventilation air blowing passage 31 communicating with the ventilation air inlet 32 is formed in the duct portion 30b.

Further, the magnetron 14 is located between the ventilation fan 8 and the duct portion 30b, and its front end side microwave radiation portion 14a is formed on the right side plate 3d of the inner housing 3 by microwave radiation. It is supported by the right side plate 3d of the inner housing 3 and the magnetron support 30a of the duct 30 while facing the inside of the heating chamber 2 through the mouth 33.

Therefore, the ventilation air blown by the ventilation fan 8 enters the upstream side of the duct 30 after cooling the magnetron 14, and further from the ventilation air inlet 32 through the duct portion 30b to the heating chamber. 2 will be introduced.

The high-voltage transformer 24 is installed at the bottom of the first hollow portion 4.

On the other hand, in the second cavity, an exhaust duct 28 for exhausting the ventilation air introduced into the heating chamber 2 as described above to the microwave radiation port 33 of the magnetron 14 is provided. They are provided so as to face each other. The exhaust duct 28 includes a first exhaust port 26 formed in the left side plate 3c of the inner casing 3 and a second exhaust port 27 formed in the left side plate 1c of the outer casing 1 as a cylindrical body. And a stirrer fan 42 having a large number of microwave reflecting blades is provided inside thereof. The stirrer fan 42 has a rotary shaft 41 rotatably supported by a bearing portion 40 fixed to an inner wall surface portion of the second exhaust port 27 of the left side plate 1c of the outer housing 1, and the heating chamber 2 The microwaves radiated from the magnetron 14 are effectively reflected and dispersed in the heating chamber 2 by being rotated by the ventilation air of the ventilation fan 8 discharged through. In addition, a humidity sensor 50 is installed in the exhaust passage of the exhaust duct 28 from the outside of the duct so as to face the sensor.

On the other hand, reference numeral 20 is a turntable 20 provided at the bottom of the heating chamber 2, and the turntable 20 is the bottom of the outer casing 1 as in the case of the first embodiment. A turntable motor 17 provided on the side is supported by a support bracket 19 so as to be horizontally rotatable. Then, a glass plate 21 for placing a food item is placed on the turntable 20.

As a result of the above, in the present embodiment, the microwave radiated from the microwave radiating port 33 of the magnetron 14 in the facing direction (see the arrow (a) in the figure), the top plate 3 a of the inner housing 3, and the left and right side plates 3 c. , 3d, the bottom plate 3b, the back plate 1e of the outer housing 1, and the like, reflected by the microwave toward the first exhaust port 26, the stirrer fan 42 in the exhaust duct 28 is indicated by the arrow (c). The microwave reflecting blades efficiently reflect the microwaves to the heating chamber 2 side so that they are evenly dispersed in the heating chamber 2 and are distributed to each part of the cooked food on the cooked food placing glass plate 21. It will act evenly on the other hand. Therefore, the conventional uneven heating is eliminated.

In addition, in the above case, the stirrer fan 23 rotates the wind force more efficiently than in the case of the first embodiment by the ventilation air of the ventilation fan 8 that converges in the exhaust duct 28 and flows at a high flow rate. Therefore, just as in the case of the first embodiment, the drive motor is not necessary, which can contribute to the reduction of the product cost, and the power consumption is not reduced, and the microwave reflection efficiency is improved.

Therefore, unlike the configuration of the first embodiment, it is not possible to form the blades of the stirrer fan 23 to have a diameter large enough to cover the entire bottom of the heating chamber 2. By improving the reflection efficiency of the microwave itself, it is possible to obtain substantially the same effect of eliminating uneven heating. Further, since it is only installed in the exhaust duct 28, which is an originally empty space, the installation becomes substantially easy.

Further, even in the case of the microwave oven in which the heater is provided on the ceiling, the radiant heat is not hindered.

Further, in the configuration, as described above, the ventilation air inlet 32 and the exhaust duct 28 are also substantially facing each other, and the ventilation air introduced from the ventilation air inlet 32 into the heating chamber 2 is shown in FIG. As shown by the arrow (b), it flows very smoothly in a laminar state without becoming a turbulent state, efficiently absorbs the steam from the cooking product generated in the heating chamber 2 and exhausts it in the exhaust duct 28. Transfer to passage 28. Therefore, the humidity detection accuracy of the humidity sensor 50 is also improved.

Regarding the operation, in the configuration of the above-described embodiment, the microwave radiation port 33 of the magnetron 14 and the ventilation air introduction port 32 are formed separately, but the ventilation air introduction port 32 is the above-mentioned microwave radiation port. It is also possible to set the same plane position, that is, a position facing the exhaust duct 28 by also using 33. By doing so, the ventilation air will flow more smoothly in the direction of the arrow (a) in FIG. 4 described above, and the same effect can be made more effective.

[Brief description of drawings]

FIG. 1 is an embodiment of a device according to claim 1 of the present application.
It is a longitudinal cross-sectional view showing a configuration of a high-frequency heating apparatus according to (First Example).

FIG. 2 is a cross-sectional view of a section of the same device taken along the line 1A-A of FIG.

FIG. 3 is a sectional view of the same device taken along the line 2B-B in FIG.

FIG. 4 is an embodiment of a device according to claim 2 of the present application.
It is a horizontal sectional view which shows the structure of the high frequency heating apparatus which concerns on (2nd Example).

[Explanation of symbols]

1 is an outer casing, 2 is a heating chamber, 3 is an inner casing, 4 is a first cavity, 5 is a second cavity, 6 is an outside air inlet, 7 is a fan motor, 8 is a ventilation fan, 10 is a duct 10b is a first duct part, 10c is a second duct part, 12 is a first ventilation air inlet, 13 is a microwave radiation port, 14 is a magnetron, 15a is a second ventilation air inlet, and 17 is A turntable motor, 18 is a rotating shaft, 20 is a turntable,
23 is a stirrer fan, 28 is an exhaust duct, 30 is a duct, 30b is a duct portion, and 42 is a stirrer fan.

Claims (2)

[Scope of utility model registration request] 1. A turntable provided at the bottom of the heating chamber and driven by a turntable motor; a magnetron provided at one side of the heating chamber for radiating microwaves into the heating chamber; A ventilation fan provided on one side of the heating chamber for introducing outside air to cool the magnetron, a ventilation air inlet for introducing ventilation air after cooling the magnetron by the ventilation fan into the heating chamber, and the ventilation air In a high-frequency heating device comprising an exhaust port for discharging ventilation air introduced into the heating chamber through an introduction port to the outside, a stirrer fan is rotatable below the turntable coaxially with the turntable. A ventilation air inlet to the heating chamber is provided at the bottom of the heating chamber, and ventilation air is introduced into the heating chamber from the ventilation air inlet at the bottom of the heating chamber. A high-frequency heating device characterized in that the stirrer fan is rotated. 2. A turntable provided at the bottom of the heating chamber and driven by a turntable motor; a magnetron provided at one side of the heating chamber for radiating microwaves into the heating chamber; A ventilation fan provided on one side of the heating chamber for introducing outside air to cool the magnetron, a ventilation air inlet for introducing ventilation air after cooling the magnetron by the ventilation fan into the heating chamber, and the ventilation air In a high-frequency heating device comprising an exhaust duct for discharging ventilation air introduced into the heating chamber to the outside through an inlet, the ventilation air inlet into the heating chamber is the same as the microwave radiation port of the magnetron. Direction, the exhaust duct is installed at a position facing the microwave radiation port of the magnetron, and the exhaust duct is rotated by ventilation air. A high-frequency heating device having a stirrer fan that rotates.