JPH043814A - Heating cooker - Google Patents

Abstract

PURPOSE:To obviate an auxiliary heater and to improve the cooking property and the property for exhausting smoke and deodorizing by installing an exhaust hood at the downstream side of a plurality of exhaust gas holes disposed in a heating chamber and a catalyst member for purifying gas at the inner side of heating chamber at the upstream side of the exhaust gas holes. CONSTITUTION:When food is placed in a heating chamber 15 and heated by turning on the power for heating source, the temperature of a catalyst member 19 disposed in the heating chamber 15 increases as the temperature in the heating chamber rises. When the temperature of heating chamber 15 increases to about 300 deg.C, the food begins to produce cooking smoke. Then, a cooling fan is activated, and the cooling air passing through a magnetron is heated through the heating chamber 15 and flows into the catalyst member 19. This causes efficient oxidation combustion, removal of smoke, and deodorization. The exhaust gas purified by the catalyst is discharged through exhaust gas holes 18 and exhaust gas outlets 23 to the atmosphere. This device uses a smaller catalyst member 19 and eliminates the need for an auxiliary heater.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention purifies exhaust smoke and odors emitted during cooking.
The present invention relates to a heating cooker having a deodorizing and smoke removing function.

BACKGROUND OF THE INVENTION In recent years, as a reflection of clean thinking, housing equipment, particularly cooking utensils, equipped with smoke removal mechanisms that utilize oxidation catalysts have been put into practical use.

Conventionally, as this type of cooking device, there is an oven microwave oven as shown in FIGS. 4 and 5, for example. In FIGS. 4 and 5, reference numeral 1 denotes a heating chamber, which has a heater 2 for cooking, a shelf 3 for placing food to be cooked, and an exhaust gas vent 4 composed of a plurality of pores. 5 is an opening/closing door. A magnetron 6 is used for microwave cooking, and microwaves are irradiated into the heating chamber j through a waveguide 7. A cooling fan 8 prevents the temperature of the magnetron 6 and a control circuit (not shown) from rising. Cooling air passing through the magnetron 6 flows into the heating chamber 1 through a hood 9. Reference numeral 10 denotes an exhaust passage that guides the exhaust gas from the heating chamber 1 to the outside, and a catalyst body 11 for purifying the exhaust gas and an auxiliary heater 12 for heating the catalyst are provided on the downstream side of the exhaust gas vent 4 inside the exhaust passage. . 13
is an outer cylinder, and 14 is a heat insulating material.

When performing microwave cooking with the above configuration, microwaves are irradiated from the magnetron 6 to the food to heat it, and when performing oven cooking or grill cooking, the magnetron 6 does not operate and the heater 2 is energized to heat the food. As the interior of the chamber 1 is heated, a portion of the cooling air from the cooling fan 8 flows into the heating chamber 1 from the hood 9, and the heated exhaust gas reaches the exhaust passage IO, passes through the catalyst body 11, and is desorbed. Smoke and odor removal takes place.

Generally, an oxidation catalyst cannot fully demonstrate its function unless it is heated to about 300°C or higher.

Although there are limits, the higher the temperature of the catalyst, the higher the activity, and the size of the catalyst body 11 can be reduced. With this configuration, when electricity is supplied to the auxiliary heater 12 during cooking, the catalyst body 11 is heated by both the heat of the exhaust gas and the auxiliary heater 12, and the temperature of the catalyst body can be sufficiently raised.

As a result, it becomes possible to downsize the catalyst body.

Problems to be Solved by the Invention However, since such a conventional heating cooker requires an auxiliary heater, it is expensive to implement its control device, insulation, etc.

Second, in the case of a cooker that uses electricity as a power source, it is necessary to supply sufficient electrical energy to the cooking heater in order to quickly heat the food to a golden brown. If the auxiliary heater for heating the catalyst is energized, the energy supplied to the cooking heater will be insufficient and the cooking performance will deteriorate. In other words, since the cooking time increases and heating is performed at a low temperature, there is a problem that the finished product is not browned.

The present invention solves the above problems, and by heating the catalyst using a heating source for cooking, it eliminates the need for an auxiliary heater, reduces costs, and improves cooking performance and eliminates smoke and odor. The purpose of this invention is to provide a heating cooker with excellent purification performance.

Means for Solving the Problems In order to achieve this object, the heating cooker according to the present invention has the following features:
A heating chamber for storing food, a plurality of exhaust gas holes provided in the heating chamber, and a heating chamber provided downstream of the exhaust gas holes,
It consists of an exhaust hood that leads exhaust gas to the outside, a heat source that heats the food, and a catalyst body for gas purification that is provided upstream of the exhaust gas hole, that is, on the inside of the heating chamber.

Effect: With the above configuration, the catalyst body exists within the heating chamber and can effectively receive thermal energy from the heating source. Therefore, a sufficient activation temperature can be obtained without an auxiliary heater. Furthermore, since the temperature distribution in the cooking chamber is uniform, the temperature distribution of the catalyst body is also relatively uniform, and the catalyst can effectively exhibit its performance.

Furthermore, compared to conventional catalysts, less heat is released from the surroundings of the catalyst, improving the thermal response speed and reaching the activation temperature in a short time.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

In the first [D and FIG. 2, 15 is a heating chamber in which food is stored, and a heating source 16 consisting of a plane heater for heating the food is provided on the upper surface of the heating chamber. Heating chamber 1
The protrusion 17 of 5 is provided with an exhaust gas hole 18 consisting of a plurality of pores for exhausting exhaust gas generated during cooking, and a predetermined gap is provided on the upstream side of the hole 18 to reduce pressure loss. A catalyst body 19 that is provided to purify exhaust gas is fixed by a locking member 2o. 21 is the protrusion 1
The exhaust gas purified by the catalyst body 19 passes through the exhaust gas hole 18 and is discharged to the outside from the exhaust hole 23 provided on the outer surface 22.

Reference numeral 24 denotes a heat conductive member having one end in contact with the heat source 6 and the other end in contact with the upper end surface of the catalyst body 19 via a sheet metal member 25 constituting the heating chamber 15. It is made of materials with relatively high thermal conductivity, such as

Catalyst I9 is made of CuMo-Co on a honeycomb-shaped carrier made of fibers of 5102 and A1□03.
catalyst material and zinc oxide (Zn○), which has a relatively high dielectric constant.
) whiskers are mixed and supported in a predetermined ratio and fired. Therefore, when microwaves are irradiated, Z
nO absorbs the microwave, and the temperature of the catalyst body 19 increases.

The rest of the structure is the same as the conventional example shown in FIGS. 4 and 5, and the same reference numerals will be given and the explanation will be omitted.

Next, the operation of the above configuration will be explained. When the food is placed in the heating chamber 15 and the power is turned on to the heating #16, the food is heated and when the temperature of the heating chamber 15 reaches around 100° C., the water contained in the food becomes water and water.

At this stage, the cooling fan 8 does not rotate. This is to increase the temperature of the heating chamber 15 efficiently.

At this time, as the temperature of the heating chamber 15 rises, the temperature of the catalyst body 19 disposed within the heating chamber 15 also rises, but the temperature distribution within the heating chamber 15 is heated to be uniform from the viewpoint of cooking performance. Since the source 16 is provided, the temperature of the catalyst body 19 also increases almost uniformly. Furthermore, in the conventional example, the catalyst body was provided on the downstream side of the exhaust gas vent 18, so that it was difficult for thermal energy to reach the catalyst body 19 when the cooling fan 8 did not rotate.However, in this embodiment, the catalyst body is provided in the heating chamber 15. Therefore, thermal energy is efficiently absorbed even at this stage. Heating chamber 1
When the temperature of No. 5 rises and reaches around 300'C, the food begins to produce a cooker. At this time, the cooling fan 8 operates, and the cooling air that has passed through the magnetron 6 is heated through the heating chamber 15 and flows into the catalyst body 19. At this time, the overall temperature of the catalyst body 9 is a sufficient activation temperature, and oxidative combustion occurs efficiently to remove smoke and odor. The exhaust gas purified by the catalyst body 19 is discharged to the outside through the exhaust gas hole 18 and the exhaust hole 23.

In this embodiment, since the protrusion 17 is provided and the catalyst body 19 is disposed, there is a concern that heat may be radiated from the protrusion. Since the contact medium 19C is transmitted to the catalyst body 19, a drop in temperature of the catalyst body 19 can be prevented. This makes it possible to increase the volume of the heating chamber 15 that is effective for cooking.

Furthermore, when cooking in a microwave oven, the diameter and pitch of the exhaust gas vents 18 are limited to predetermined dimensions in order to prevent microwaves from leaking to the outside. That is, the exhaust gas vent 18 has the function of preventing electricity and wave leakage. In this embodiment, a catalyst body 19 is disposed upstream of the exhaust gas vent 18, and zinc oxide (ZnO) whiskers, which are dielectric materials, are mixed in the catalyst body 19, so that when cooking in a microwave oven, microwave A part of the water is also absorbed by the catalyst body 19, further enhancing the wave leakage effect, resulting in a rapid and uniform temperature rise, which is also effective in removing cooking odors during microwave cooking, such as the smell of defrosted fish. .

As described above, according to this embodiment, by providing the catalyst body 19 on the upstream side of the exhaust gas vent 18, a sufficient catalyst activation temperature can be obtained without the need for an auxiliary heater. The relationship between the cooking time and the temperature of the catalyst body 19 when the auxiliary heater is not used is shown in FIG. Catalyst body 19
The difference between the lowest and highest temperatures is small. In other words, the temperature distribution is good.

This makes it possible to realize a small-sized catalyst body 19, and also to reduce the cost since an electric circuit and an insulation structure for mounting an auxiliary heater are not required.

Further, since the protrusion 17 is provided and the catalyst body 19 is disposed therein, and the catalyst body 19 is heated by heat conduction by the heat conduction member 24, a reduction in the effective volume of the heating chamber 15, that is, the cooking volume can be prevented. .

Furthermore, since Zn○ whiskers, which are dielectric materials, are mixed into the catalyst body 19, some of the microwaves are absorbed into the catalyst body 9 during microwave cooking, causing cooking odors during microwave cooking, such as valve valves. It also has a catalytic effect in removing thawing odor.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the catalyst body is disposed upstream of the exhaust gas vent, that is, inside the heating chamber where the temperature distribution is uniform, so that the catalyst body does not cook well. Thermal energy of the heating source can be used effectively, reaching a nearly uniform activation temperature within a short time without the need for an auxiliary heater, and microwaves are absorbed by the dielectric material mixed in the catalyst, preventing radio wave leakage. It is highly effective, and it is possible to provide a low-cost heating cooker with excellent smoke and odor purification functions.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a heating cooker showing an embodiment of the present invention;
Figure 2 is an enlarged sectional view of the same main part, Part 3 is a characteristic diagram showing the relationship between cooking time and catalyst temperature, Figure 4 is a sectional view of a conventional heating cooker, and Figure 5 is the same as that shown in Figure 4. This is a cross section taken along line A-A. 15...Heating chamber, 16...Heating source, 1
8... Exhaust gas vent, 19... Catalyst body,
21...Exhaust foot, 24...Heat conduction member, 25...Sheet metal member. Name of agent: Patent attorney Shigetaka Awano TIL time:

Claims (2)

[Claims] (1) A heating chamber that stores food, a plurality of exhaust gas vents provided in the heating chamber, an exhaust hood that is provided downstream of the exhaust gas vents and guides the exhaust gas to the outside, and a heating chamber that heats the food. A heating cooker including a heating source and a catalyst body for gas purification provided upstream of the exhaust gas hole. (2) Claim (1) comprising a heat conductive member having one end in contact with a heating source and the other end in indirect contact with one end surface of a catalyst body for gas purification via a sheet metal member constituting a heating chamber. ) listed heating cooker.