JPH0123042Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hot air circulation type microwave oven, and is particularly suitable for guiding exhaust gas from a gas stove etc. through an exhaust passage formed on the outer periphery of the casing by attaching it to the wall of a house above the gas stove etc. This article relates to a new hot air circulation type microwave oven.

Conventionally, a configuration has been known in which an exhaust passage is formed around the outer circumference of the casing of a microwave oven using a hood or the like, and the exhaust passage is attached to the wall of a house above the gas stove, etc., so that the exhaust gas from the gas stove etc. is guided through the exhaust passage. . Conventional microwave ovens used for such purposes do not have a configuration in which hot air is circulated within a heating chamber in which the food to be cooked is heated in order to achieve a so-called convection cooking function. Therefore, it is desired that hot air circulation type microwave ovens be applied to such applications as well.

A cross section of a conventional countertop hot air circulation microwave oven seen from the front is shown in Figure 1, and a cross section taken from the cutting plane line - in Figure 1 is shown in Figure 2.
As shown in the figure. A heating chamber 2 is formed by the casing 1 . This heating chamber 2 is provided with a table 3 that is rotated around a vertical axis. The food to be cooked is placed on this table 3. The food to be cooked is dielectrically heated by electromagnetic wave generating means 4 such as a magnetron. An intake port 6 is formed in the center of the rear plate 5 of the casing 1 . An exhaust port 7 is formed surrounding the outer periphery of the intake port 6. A flow path 8 is formed on the outside of the rear plate 5. A ring-shaped heater 9 is provided within this flow path 8 . A fan 10 is placed in the center of this heater 9. This fan 10 is driven by a motor 11. fan 1
0 rotates, gas in the heating chamber 2 is sucked through the intake port 6, heated by the heater 9, and guided into the heating chamber 2 through the exhaust port 7.

In the prior art shown in FIGS. 1 and 2, the hot air from the exhaust port 7 flows along the inner surface of the casing 1, so the temperature of the casing 1 tends to rise and heat loss is large. Furthermore, the temperature of the fan 10 increases due to the radiant heat of the heater 9, and the temperature of the motor 11 also increases due to heat conduction. In order to apply such a hot air circulation type microwave oven to the above-mentioned use, if an exhaust passage is formed around the outer periphery of the casing 1 to guide relatively high temperature exhaust gas from a gas stove, etc., the casing 1 The temperature of the paint or film formed on the inner surface of the
This results in an abnormal rise in the temperature of the bearings and coils of the motor 11. Therefore, a hot air circulation type microwave oven having such a configuration cannot be applied to the above-mentioned uses.

The cross-section seen from the front of a conventional countertop type hot air circulation microwave oven having another configuration is the third one.
4, and a cross section taken along the section line - in FIG. 3 is shown in FIG. The gas in the heating chamber 2 is sucked by the fan 10 from the air intake port 12 formed in the top plate 17 of the casing 1, heated by the annular heater 9, and passed through the flow path 15 to the one side wall 18 of the casing 1. The air is introduced into the heating chamber 2 through an air intake port 16 formed in the heating chamber 2 . Although such a hot air circulation type microwave oven has the advantage that the temperature rise of the casing 1 is suppressed compared to the configuration shown in FIGS. 1 and 2, as the temperature of the top plate 17 rises, The temperature of the bearings and coils of the motor 11 will definitely exceed the standard values. Also this third
In the hot air circulation type microwave oven shown in FIG. 4 and FIG. 4, the flow path 15 is bent over the top plate 17 and the side wall 18, so there is a problem that the structure is somewhat complicated.

An object of the present invention is to provide a hot air circulation type microwave oven that suppresses the temperature rise of the casing.

The present invention includes a casing 3 forming a heating chamber 36.
An air intake port 41 is formed near the upper part of one side wall 40 of 5 (the near side is the right side in FIG.
disposed outside the side wall 40, an exhaust port 42 is formed in the side wall 40 at a lower part of the side wall 40 and closer to the rear than the intake port 41 (to the left in FIG. 9); A cover body 43 is attached to the outer periphery of the Shirotsuko fan 40, and the cover body 43 includes a first portion 43a that covers the Shirotsuko fan 45 in an arc shape, and a first portion 43a that covers the Shirotsuko fan 45 in an arc shape.
A flow path 44 is formed by a second portion 43b that extends vertically and guides the gas sucked from the intake port 41 by the air intake port 5 from the rear side of the Sirotskov fan 45 to the exhaust port 42 along the outer circumferential surface of the side wall 40. However, a heater 47 is disposed within the flow path 44 of the second portion 43b, and a motor 46 that drives the Sirotskov fan 45
A hood 2 attached to the outside of the first portion 43a of the cover body 43 and attached to the outer peripheral surface of the side wall 40.
1 has an exhaust gas inlet 29 that opens downward, and the lower end of the hood 21 is located at the lower end of the side wall 40, and is approximately equal to the width of the side wall 40 (the length in the left-right direction in FIG. 9). The hood 21 forms a flow path 23 that becomes closer to the rear (to the left in FIG. 9) as it goes upward, and the motor 46 forms a flow path 23 that becomes closer to the rear (to the left in FIG. 9) of the hood 21 (to the right in FIG. 9). A duct 2 that is exposed and extends upward and communicates with the flow path 23 of the hood 21 is located at the upper part of the casing 35 and near the rear.
5 is formed, and a fan 31 is provided in the upper part of the casing 35 to guide the exhaust gas in the hood 21 to the duct 25.

Fig. 5 is a front view of one embodiment of the present invention, Fig. 6 is a cross-sectional view as seen from the front, and Fig. 7 is a cross-section seen from the cutting plane line - of Fig. 6 showing the installed state. It is a diagram. A flow path 2 is provided on both left and right sides of the hot air circulation type microwave oven 20 by hoods 21 and 22.
3 and 24 are formed, respectively. This flow path 23,
24 communicates with a flow path 26 of a duct 25 provided at the top of the microwave oven 20. Hood 21, 22
As it goes upward, it narrows toward the lower wall surface 27. A gas stove 28 is arranged below the microwave oven 20. Exhaust gas from the gas stove 28 flows from exhaust gas inlets 29 and 30 formed in the hoods 21 and 22 to the fan 3 via flow paths 23 and 24.
1 and 32, and the flow path 2 of the duct 25
6. The fans 31 and 32 are motors 33
driven by.

FIG. 8 is a front sectional view of the hot air circulation type microwave oven according to the present invention, and FIG. 9 is a sectional view taken from the section line - in FIG. 8. The casing 35 forms a heating chamber 36 . A table 38 is provided at the bottom of the heating chamber 36 and is rotated by a motor 37 around a vertical axis. A food to be cooked 49 is placed on the table 38. This to-be-cooked item 49 is connected to an electromagnetic wave generating means 3 such as a magnetron.
9 and dielectrically heated.

In order to perform convection cooking, an intake port 41 is formed in the upper part of one side wall 40 of the casing 35. An exhaust port 42 is formed at the bottom of the side wall 40 . A cover body 43 is fixed to the outside of one side wall 40 (left side in FIG. 8). Thereby, a flow path 44 is formed that communicates the inlet port 41 and the exhaust port 42. In this flow path 44, a Shirotsuko fan 45 facing the intake port 41 is arranged. This sirotskov fan 45 is rotated around a horizontal axis by a motor 46. The Sirotskov fan 45 sucks the gas in the heating chamber 36 through the intake port 41 and blows the gas into the side wall 4.
Air is blown inside the flow path 44 along the outer circumferential surface of the tube. The gas from the Sirotskov fan 45 is heated by a coil-shaped heater 47 disposed within the flow path 44 . The axis of the heater 47 is along the direction in which the gas in the flow path 44 flows. The hot air heated by the heater 47 is guided into the heating chamber 36 from the exhaust port 42.

Although the hot air heated by the heater 47 is discharged only from the exhaust port 42 formed in one side wall 40 of the casing 35, the food to be cooked 49 is rotated around the vertical axis on the table 38, so that
The food to be cooked 49 can be heated and cooked at a uniform temperature throughout without causing temperature unevenness.

According to such an embodiment, hot air is sucked out from the exhaust port 42 formed in one side wall 40 of the heating chamber 36, so that the prior art described in connection with FIGS. 1 and 2 above is improved. In comparison, the temperature rise in the casing 35 can be suppressed to a low level. Also Sirotskov fan 4
5 and the heater 47 is relatively long, so that the radiation from the heater 47 suppresses the temperature rise in the Sirotskov fan 45 to a low level.
This allows the motor 46 to move from the Sirotskov fan 45.
Heat conduction to is kept to a minimum. This motor 46
is arranged on one side of the casing 35,
Compared to the configuration in which the motor 11 is disposed on the top plate 17 of the casing 1 in the prior art described in connection with FIGS. 3 and 4, the temperature rise in the motor 46 due to the convection of hot air can be suppressed to a much smaller level. Moreover, since the sirotsukofan 45, the heater 47, etc. are provided on one side wall 40 of the casing 35, the structure is relatively simple.

FIG. 10 shows another usage state of the microwave oven 20 according to the present invention. In this example, the rack 50
is placed on table 38, and table 3
Not only the food to be cooked 49 is placed on the rack 8, but also the food to be cooked 51 is placed on the rack 50.

The hot air circulation microwave oven 20 according to the present invention includes:
It may also be implemented as a countertop type without providing the hoods 21, 22, etc. Heater 47
Although it is formed into a coil shape in the illustrated embodiment, it goes without saying that it may have another shape.
This is realized using sheathed wire, nichrome wire, etc.
Further, according to the present invention, the gas from the intake port 41 is blown along the one side wall 40 by the Shirotsuko fan 45, so that the structure of the flow path 44 can be simplified and the size can be reduced. can.

The Sirotskov fan 45 has a function of guiding the gas from the intake port 41 along the outer peripheral surface of the side wall 40, so that the configuration of the flow path 44 is simplified. As another embodiment of the present invention, a centrifugal fan or the like having a different configuration may be used in place of the Sirotskov fan 45, and in this way the gas from the intake port 41 can be guided along the outer peripheral surface of the side wall 40. is possible.

As described above, according to the present invention, the intake port 41 is formed sufficiently in front of one side wall 40 of the casing 35 that forms the heating chamber 36, and the exhaust port 42 is located close to the back of this intake port 41 and is located in the side wall. 40, the cover body 43 has a first portion 43a that covers the Shirotsukou fan 45 in an arc shape, and a second portion 43b that extends up and down to guide the gas from the Shirotsukou fan 45 to the exhaust port 42. Furthermore, the heater 47 is provided within the flow path 44 of the second portion 43b. Therefore, radiation heat transfer from the heater 47 to the Sirotskov fan 45 is avoided as much as possible. Such excellent effects of the present invention cannot be achieved by the prior art. Therefore, the temperature rise of the motor 46 can be suppressed.

However, this motor 46 is also exposed to the front side from the flow path 23 of the hood 21. Therefore, the motor 46 is in contact with the atmosphere and the flow path 2 in the hood 21 is
Overheating by exhaust gas, which may be relatively hot, flowing through 3 is avoided as much as possible.

Furthermore, the lower end of the hood 21 is located at the lower end of the side wall 40, and is approximately equal to the width of the side wall 40 (the length in the left-right direction in FIG.
Contact of the exhaust gas from the motor 46 with the motor 46 is avoided as much as possible. This also prevents the temperature of the motor from increasing, and also prevents water droplets contained in the exhaust gas from adhering to the motor 46 and shortening the life of the motor 46.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the prior art as seen from the front;
The figure is a sectional view taken from the cutting plane line - in Fig. 1, Fig. 3 is a sectional view taken from the front of another prior art, and Fig. 4 is a sectional view taken from the front of another prior art.
The figures are a sectional view taken from the cutting plane line - in Fig. 3, Fig. 5 is a front view of an embodiment of the present invention, Fig. 6 is a simplified sectional view of the embodiment seen from the front, and Fig. 7 The figure is a sectional view taken from the cutting plane line - in Fig. 6.
9 is a sectional view taken from the front of the microwave oven 20 according to the present invention, FIG. 9 is a sectional view taken from the cutting plane line - in FIG. 8, and FIG. It is a diagram. 20... Hot air circulation microwave oven, 21, 22...
...Hood, 25...Duct, 31, 32...Fan, 35...Casing, 36...Heating chamber, 39
...Electromagnetic wave generating means, 40...Side wall, 41...Intake port, 42...Exhaust port, 43...Cover, 44...
...Flow path, 45...Syrotskov fan, 46...Motor, 47...Heater.

Claims (1)

[Scope of Claim for Utility Model Registration] An intake port 41 is formed near the top of one side wall 40 of the casing 35 forming the heating chamber 36, and a Sirotskov fan 45 facing the intake port 41 is provided.
disposed outside the side wall 40, an exhaust port 42 is formed in the side wall 40 at a lower part of the side wall 40 and closer to the rear than the intake port 41, and a cover body 43 is provided on the outer periphery of the side wall 40. Attachment: This cover body 43 includes a first portion 43a that covers the Shirotsuko fan 45 in an arc shape, and a first portion 43a that covers the Shirotsuko fan 45.
A flow path 44 is formed by a second portion 43b that extends vertically and guides the gas sucked from the intake port 41 by the air intake port 5 from the rear side of the Sirotskov fan 45 to the exhaust port 42 along the outer circumferential surface of the side wall 40. However, a heater 47 is disposed within the flow path 44 of the second portion 43b, and a motor 46 that drives the Sirotskov fan 45
A hood 2 attached to the outside of the first portion 43a of the cover body 43 and attached to the outer peripheral surface of the side wall 40.
1 has an exhaust gas inlet 29 that opens downward, the lower end of the hood 21 is located at the lower end of the side wall 40, and is approximately equal in width to the side wall 40, and the hood 21 moves upward toward the rear. The motor 46 is exposed on the front side of the flow path 23 of the hood 21, and the motor 46 is connected to the flow path 23 of the hood 21 at the rear side of the upper part of the casing 35 and extends upward. Extending duct 2
5 is formed, and a fan 31 is provided in the upper part of the casing 35 to guide the exhaust gas in the hood 21 to the duct 25.