JP2508693Y2 - microwave - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing device for a microwave oven.

[0002]

2. Description of the Related Art In recent microwave ovens, for example, a microwave oven having a grill or an oven function has become popular.
In such a microwave oven, a heating heater (sheath heater, ceramic heater, argon heater, etc.) generally used for grill heating or oven heating is provided on the ceiling of the refrigerator (see, for example, Japanese Utility Model Laid-Open No. 2-6480). .

However, since the above-mentioned grill heating is generally used for grilling fish and meat, there is a problem that an odor is apt to occur. Such odor can be deodorized by providing a deodorizing catalyst.

Therefore, for example, an oxidation catalyst for deodorization which oxidizes and removes the odor in the exhaust gas is provided in an exhaust duct which is usually provided independently of the above-mentioned installation portion of the heater for heating. Can be considered.

However, the catalyst generally has an activation temperature, and there is a problem that the catalyst does not function unless it is under the activation temperature or higher.

As a conventional technique for solving such a problem, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 2-137607. In the prior art, as described above, an oxidation catalyst for deodorization is provided in the middle of an exhaust duct provided separately from the cooking heater, and the catalyst is removed from the heat shield plate of the cooking heater. It is configured by providing a heat transfer plate for transmitting heat.

[0007]

However, the conventional technique has the following problems due to its structure.

(1) The heat shield plate is heated to a certain temperature or higher,
Since the heat of the heat shield plate is further transferred to the catalyst through the heat transfer plate of a considerable length, it takes a considerable amount of time for the catalyst to reach the activation temperature, and the odor from the cooked food is reduced. In many cases, the deodorizing effect of the catalyst cannot be expected although it is generated.

(2) As the number of parts increases and the space factor deteriorates, the heat transfer plate cannot be extended due to the design structure. In such a case, it is difficult to realize the deodorizing structure itself.

[0010]

The present invention was made to solve the above problems, and comprises a heater for heating an oven or a grill and an exhaust duct for discharging the air in the refrigerator. In a microwave oven, the exhaust duct is arranged through the heater, and a catalyst for deodorization is provided near the heater in the exhaust duct so that the catalyst can be heated and activated by facing the heat radiation surface of the heater. It is characterized by having done.

[0011]

In the structure of the deodorizing device of the microwave oven of the present invention, first, since the exhaust duct for discharging the air in the refrigerator is provided through the heating heater itself for cooking, for example, the smell of the object to be heated when the grill is heated is included. The air in the refrigerator is discharged to the outside through the vicinity of the heater in the exhaust duct.

A catalyst for deodorization is disposed near the heater in the exhaust duct so as to face the heat radiation surface of the heater, and the catalyst is directly heated by radiant heat from the heater. Therefore, the odor in the inside air discharged to the outside is surely and effectively deodorized via the catalyst substantially in synchronization with the heating of the cooked food. Will be done.

[0013]

Therefore, according to the deodorizing device for a microwave oven of the present invention, it is possible to solve the conventional problems of deactivating the deodorizing catalyst and releasing the bad odor due to insufficient deodorizing from the start of cooking.

In particular, since the catalyst is provided at a position facing the heat radiating surface of the heater, the heating efficiency is high, and there is a great merit in that it can be effectively heated at the same time as the start of cooking. Further, there is also an advantage that the cost can be reduced because a heater dedicated to the catalyst is not required.

[0015]

Embodiments (1) First Embodiment FIGS. 1 to 9 show the configuration of a deodorizing device for a microwave oven according to a first embodiment of the present invention.

First, FIG. 1 shows the overall structure of a microwave oven with a grill / oven function provided with the deodorizing device. First, in the figure, reference numeral 1 is a housing forming a microwave oven main body. Reference numeral 2 is a heating chamber (internal chamber) having a predetermined volume, which is formed inside the housing 1 and has an upper heater 46, which will be described later, on the ceiling. Then, on both side wall surfaces 2a, 2b of the heating chamber 2, for example, as shown in FIG. 2, upper and lower three steps of convex shelf receiving portions 3a to 3c, 3a to 3c are arranged in parallel, respectively. Using the left and right shelf receiving portions 3a to 3c, 3a to 3c, the first to third three cooking dishes 4a to 4c are inserted from the front side to the rear side as shown in FIG. It is designed to be supported in parallel.

The cooking dishes 4a to 4c are shown in FIGS. 3 and 4, for example.
As shown in detail by enlarging in FIG. 2, each upper surface has a concave portion 18 for accommodating an object to be cooked, and the bottom portion 6 thereof has a sufficient and uniform heating area as shown in FIG. 5, for example. The sheathed heater 5 is arranged and fixed in such a form. Further, a heat insulating plate 8 is attached to the bottom of the cooking dishes 4a to 4c using a screw 9 while interposing a heat insulating material 33 so as to cover the sheathed heater 5. Further, in addition to the screws 9 for mounting the heat shield plate, convex portions 10, 10 ... Protruding at a predetermined height further below the bottom surface position of the heat shield plate 8 are provided at appropriate places. The plurality of convex portions 10, 10 ... Serve as the legs when the cooking dishes 4a to 4c are taken out of the heating chamber 2 and placed on the table or the like.

On the other hand, reference numerals 11a and 11b are pin-shaped power plugs formed at both ends of the sheath heater 5,
The power plugs 11a and 11b are juxtaposed at a predetermined interval in a state of protruding rearward by a predetermined length L from the rear end side edge portion 12b of each of the cooking dishes 4a to 4c.

Further, as shown in FIGS. 3 and 4, the front end side edge portion of the cooking dishes 4a to 4c indicated by the reference numeral 12a is covered with the protective plate 13 from the front surface side to the rear surface side. It is fixed with screws 14 and 14. The front edge 1 of the cooking dish covered with the protection plate 13
For example, as shown in FIG. 7, the distal end side engaging portion 15 a of the handle 15 for taking out a cooking dish is engaged with 2 a, so that the handle 15 can be taken out of the refrigerator using the handle 15. Has become. The engaging portion 15a is provided with a hook portion 16 having an inverted U-shaped fitting groove fitted into the front end side edge portion 12a of the cooking dishes 4a to 4c from above, and is located below the hook portion 16 and A support 17 for supporting the bottom wall 6a of the cooking dishes 4a to 4c.
, So that the cooking plates 4a to 4c are effectively gripped. In this case, generally, the cooking dishes 4a-
4c is often made of aluminum die-cast to reduce the weight, and therefore, the handle engaging portion is easily damaged as it is, but in this embodiment, the protection plate 13 is provided on the engaging portion as described above. Because of the coating, such fear does not occur.

On the other hand, as shown in FIG.
The power plugs 11a, 1 on the cooking dishes 4a to 4c side are located between the outer cavity wall 1a on the 0 side and the outer panel 19.
1b is provided with a pair of left and right power supply sockets 21a, 21b. By inserting the power supply plugs 11a, 11b on the side of the cooking dishes 4a-4c into the power supply sockets 21a, 21b, the sheath heater 5 is connected. Power is being supplied.

The power supply sockets 21a and 21b are, for example, as shown in FIG. 6, a metal cylindrical body 22 fitted and fixed in the fitting hole of the cavity wall 1a and a rear portion of the cylindrical body 22. Synthetic resin holder 23 that is integrally locked to the
A V-shaped spring-side ground terminal 24 fitted in the cylindrical body portion 22; and a bag-like shape provided with a slit protruding rearward from the inside of the holder portion 23 so as to be expandable. Power jack 25.

Then, each of the power source terminal portions B and the ground terminal portions A of the power source plugs 11a and 11b on the cooking dish 4a to 4c side is surely inserted to the end like the phantom line in the figure, so that the plug side Further, the terminals of the grounding portion on the socket side and the power supply terminals are electrically connected to each other in a state where the contact resistance is small, so that power is supplied to the sheathed heaters 5 and the cooking plates 4a. The sheath heaters 5 to 4c, that is, the lower heaters, generate heat.

On the other hand, the upper heater 46 is provided, for example, as shown in FIGS. 1, 8 and 9, above the heating chamber 2 and above the ceiling panel 2d having high thermal conductivity. The plate-shaped heat generating elements 46a, 46a, ... Are integrally attached to the lower surface side set recesses of the heat transfer plate 47 and are arranged to be energizable via the power supply terminals 48a, 48b. . Further, a heat shield plate 50 is further provided on the upper part of the upper heater 46 via a heat insulating member 49, and a top plate 57 as an outer casing is attached to the upper part thereof.

Further, the side walls 2a, 2b of the heating chamber 2 described above.
On one side (the left side in the drawing) 2a, for example, FIG.
As shown in detail in FIG. 1, a punching hole portion 51 is formed, and the exhaust duct 5 on the side is provided through the punching hole portion 51.
It is communicated within 2. The exhaust duct 52 is formed by, for example, as shown in FIG. 9, a rectangular cylindrical body provided in the space between the side wall 2a on the heating chamber 2 side and the external side wall panel 53, The punching hole 51 formed on the side wall 2a of the heating chamber 2 and the punching hole 54 formed on the outer side wall panel 53 side can communicate with each other. A deodorizing catalyst 55 is provided in the exhaust duct 52 as shown in the figure.

The catalyst 55 is formed by molding an oxidation catalyst in which a precious metal catalyst such as Pt is carried on the surface of a basic carrier such as CaO.Al ₂ O ₃ into a honeycomb structure, and is discharged from the inside of the chamber. The odor in the exhaust gas is deodorized extremely efficiently in a low pressure loss state.

The catalyst 55 constructed as described above is constructed by forming a large number of punching holes 58, 58 on a metal plate having a high thermal conductivity such as a copper plate so as to have good air permeability. The holding plate 56 is held in the state shown in the figure, and the upper end 56a side of the holding plate 56 penetrates the upper wall portion of the exhaust duct 52 to the end portion 47a of the heat transfer plate 47 of the upper heater 46. On the other hand, catalyst 55
Are integrally polymerized and fastened to each other so as to have good heat transfer performance. Therefore, the heat from the upper heater 46 can be efficiently transmitted to the catalyst 55 via the holding plate 56, and the catalyst 55 is effectively heated to the activation temperature in synchronization with the heat generation of the heater 46, which is sufficient. Deodorizing effect due to various oxidative combustion comes to be exhibited. As a result, the air discharged to the outside from the exhaust duct 52 is sufficiently odor-free and has no offensive odor.

(2) Second Embodiment Next, FIG. 10 shows the construction of the essential parts of a deodorizing device for a microwave oven according to a second embodiment of the present invention.

That is, in the structure of the deodorizing device for the microwave oven of the second embodiment, the holding plate 56 in the catalyst structure of the first embodiment is also a flat heater 60 similar to the heating element 46a of the upper heater 46. And the upper end portion 60a of the flat heater 60 is attached to the end portion 47a of the heat transfer plate 47 of the upper heater 46 in the same manner as in the first embodiment, so that the heating efficiency of the catalyst 55 is increased and the entire catalyst 55 is formed. By enclosing the flat heater 60, the impact resistance performance is improved, and even if the catalyst 55 is broken due to some reason such as long-term use, its shape and function can be maintained as it is. In this case, the catalyst 55 has a large number of punching holes 62, 62 ...
The flat heater 60 via the insulating plate 61 formed with
It is designed to be held at.

For example, in the structure of the first embodiment, the heating elements 46a, 46a, ... Of the upper heater 46 generate heat, and the heat is transmitted to the holding plate 56 side via the heat transfer plate 47, and the holding plate 56a. Since the catalyst 55 is heated by the heat of 56 and the heat transfer structure is indirect, it takes a long time to activate the catalyst 55. Therefore, depending on the type of food, it is possible that a certain amount of off-flavor is released due to insufficient deodorizing function for a certain period of time after the start of cooking.

However, when configured as in this embodiment,
Since the heating of the food to be cooked and the activation of the catalyst 55 by heating proceed substantially at the same time, such a problem does not occur. Further, since the flat heater 60 and the upper heater 46 are adjacent to each other, the power supply wiring can be shared, and the wiring structure is simple, so that the realization is easy.

(3) Third Embodiment Next, FIG. 11 shows the construction of the essential parts of a deodorizing device for a microwave oven according to a third embodiment of the present invention.

In the third embodiment, there is a drawback that the temperature rise up to the activation temperature of the first embodiment is slow, and that the second embodiment requires the dedicated flat heater 60 for the catalyst. It is characterized by solving together.

That is, in the configuration of the deodorizing device for a microwave oven according to the third embodiment, first, the upper heater 46 described above is provided in a mountain-shaped heat shield casing 77 provided above the ceiling plate 2d as shown in the drawing. Is formed of a rod-shaped sheathed heater 71 having a space 70 and is held through the space 70 in the heat shield casing 77 from the punching hole 75 side of the heating chamber 2 side ceiling plate 2d. Exhaust duct 7 that continues to the punching hole 79 on the downstream side that communicates with the exhaust port on the outer panel side of the housing 1
3 is provided, and the catalyst 55 having the same configuration as that of the first embodiment is disposed near the outlet 80 on the exhaust duct 73 side of the space 70.

When mounting the catalyst 55,
A metal band member 7 having a high thermal conductivity, in which a large number of punched holes 78, 78 ...
It is fixed by 9 as shown. Then, the tip end portion 83 of the band member 79 is inserted up to the upper portion of the sheath heater 71 in the heat shield casing 77,
Upon receiving the radiant heat of 1, the entire catalyst 55 is efficiently heated to the back surface side thereof.

Therefore, in this structure, the exhaust passage of the exhaust duct 73 is connected from the heating chamber 2 to the external exhaust port side through the sheath heater 71, and passes through the punching hole portion 75 of the ceiling plate 2d. The discharged indoor air passes through the exhaust passage in the exhaust duct 73 after being heated to a high temperature by the sheath heater 71 in the space 70 in the heat shield casing 77 forming a part of the exhaust passage. From the punching hole 79 formed in the downstream side wall portion 85, it is discharged to the outside of the housing through the external duct.

Then, in the middle of the exhaust passage, in the vicinity of the sheathed heater 71 (the space portion outlet 80 in the heat shield casing 77).
Position 55), the catalyst 55 is placed on the sheath heater 7 as described above.
The catalyst 55 is provided over substantially the entire passage in a state of facing the heat radiation surface of No. 1, and the front side of the catalyst 55 is a sheath heater 71.
The radiant heat of the heat is directly received and heated rapidly in synchronization with the start of cooking, while the heat generated from the sheathed heater 71 via the band member 79 having high thermal conductivity allows the upper and lower sides and the back side to be efficiently heated. It is well heated.

Therefore, the catalyst 55 is quickly and effectively heated in synchronization with the heat generation effect of the sheathed heater 71 at the start of cooking, and is quickly heated to the activation temperature. It comes to exert deodorizing effect. When the odor increases with the progress of cooking, the action of the band member 79 is also added, and the entire band is effectively heated, and a greater deodorizing action is exhibited. As a result, the air discharged from the exhaust duct 73 has its odor removed sufficiently from the beginning to the end of cooking, and has no offensive odor.

(4) Fourth Embodiment Next, FIG. 12 shows the construction of the essential parts of a deodorizing device for a microwave oven according to a fourth embodiment of the present invention.

The structure of the fourth embodiment is characterized in that, in the structure of the third embodiment, the mounting structure of the catalyst 55 is improved to reduce the exhaust resistance as much as possible.
As shown in the figure, in this embodiment, the band member 79 as in the third embodiment is eliminated and both sides of the catalyst 55 are locked by only narrow claw members 81, 81. With such a configuration, the ventilation resistance of the catalyst portion is reduced by the amount of the wide band member 79 eliminated, the pressure loss is significantly reduced, and the deodorizing area is expanded, so that the deodorizing efficiency is further improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of an entire housing part of a microwave oven including a deodorizing device according to a first embodiment of the present invention.

FIG. 2 is an external perspective view of the microwave oven housing with the door removed.

FIG. 3 is a cross-sectional view showing a configuration of a cooking dish of the microwave oven.

FIG. 4 is a front view (front view) of the cooking dish.

FIG. 5 is a bottom view showing a heater installation structure at the bottom of the cooking dish.

FIG. 6 is a cross-sectional view showing a structure of a power socket portion corresponding to a power plug of the cooking dish side heater.

FIG. 7 is a partial cross-sectional view showing a structure of a front end portion of the cooking dish.

FIG. 8 is an exploded perspective view showing a configuration of the microwave oven main body.

FIG. 9 is a cross-sectional view showing a configuration of a deodorizing device section of the same microwave oven main body.

FIG. 10 is a sectional view showing the structure of a microwave deodorizing device according to a second embodiment of the present invention.

FIG. 11 is a partially cutaway sectional view of a microwave oven deodorizing device according to a third embodiment of the present invention.

FIG. 12 is a partially cutaway sectional view of a microwave oven deodorizing device according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 is a housing part, 2 is a heating chamber, 2a is a heating chamber side wall, 2d is a ceiling plate, 46 is an upper heater, 46a is a heating element, 47 is a heat transfer plate, 51 and 54 are punching holes, 52 is an exhaust duct, Reference numeral 55 is a catalyst, 56 is a holding plate, 60 is a flat heater, 70 is a space portion, 71 is a sheath heater, 73 is an exhaust duct, and 77 is a heat shield casing.

Claims (1)

(57) [Scope of utility model registration request] 1. A oven or microwave oven comprising an exhaust duct of the heater and-compartment air discharge grill for heating the exhaust duct exhaust duct while disposed through the heating heating data catalyze provided for deodorizing near heating heater, and the heat radiating surface of the heater of the catalyst
A microwave oven characterized in that they are opposed to each other and can be activated by heating.