KR20110058140A

KR20110058140A - Convection type microwave oven

Info

Publication number: KR20110058140A
Application number: KR1020090114821A
Authority: KR
Inventors: 신승진
Original assignee: 주식회사 대우일렉트로닉스
Priority date: 2009-11-25
Filing date: 2009-11-25
Publication date: 2011-06-01

Abstract

PURPOSE: A convection type microwave oven is provided to reduce the thermal loss of a convection heating unit by employing a duct for recirculating hot air, which is discharged after heating food, to a cooking chamber. CONSTITUTION: A convection type microwave oven comprises a case(30), a convection heating part, and a duct(70). The case is installed in a cabinet to form a cooking chamber(32) and has an intake port, an exhaust port(36), and a circulation port(38). The convection heating part is installed on the rear side of the intake port to supply hot air to the cooking chamber. The duct circulates the hot air discharged from the exhaust port to the inside of the cooking chamber.

Description

Convection Microwave {CONVECTION TYPE MICROWAVE OVEN}

The present invention relates to a convection microwave oven, and more particularly, to a convection microwave oven that reduces heat loss by circulating high-temperature hot air discharged from a cooking chamber back to the cooking chamber.

In general, a microwave oven is a device that cooks food by heating food while microwaves are generated from a magnetron installed in an electric room.

Recently, in order to perform various kinds of cooking operations, a heating wire for performing an oven function, and a convection heating unit for supplying hot air to a cooking chamber are provided.

The convection heating unit of the microwave oven according to the prior art includes a heater installed on the outer wall of the cooking chamber, and a blowing fan installed on the rear of the heater so that hot air generated through the heater is supplied into the cooking chamber.

In the cooking chamber in which the convection heating unit is installed, an inlet for introducing hot air and an exhaust port for discharging the hot air are formed.

The intake port is mainly formed on the rear surface of the cooking chamber, and the exhaust port is mainly formed on the side of the cooking chamber so that hot air flowing from the rear surface is transferred to the side while being in contact with food and then moved to the side to be discharged to the outside of the cooking chamber and cabinet.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

The convection microwave oven according to the prior art has a problem that it is difficult to improve the heat transfer efficiency of the hot air supplied by the convection heating unit because heat can be transferred to the food only while the hot air flowing through the intake port is moved to the exhaust port.

Therefore, there is a need for improvement.

An object of the present invention is to provide a convection microwave oven that can improve the heat transfer efficiency by increasing the contact time between hot air and food.

In order to achieve the above object, the present invention, the case is installed in the cabinet to form a cooking chamber, the inlet, the exhaust port and the circulation port is formed; A convection heating unit installed at a rear side of the inlet port to supply hot air into the cooking chamber; And a duct circulating hot air discharged from the exhaust port into the cooking chamber.

In addition, the duct of the present invention is characterized in that it extends from the exhaust port side to the discharge port side of the cabinet, and communicates with the circulation port.

In addition, the duct of the present invention is characterized in that a circulation fan opposed to the circulation port is installed.

In addition, the duct of the present invention is characterized in that the expansion portion is provided with a wider cross-sectional area toward the discharge direction of the hot air.

The convection microwave oven according to the present invention is provided with a duct for conducting heat transfer to the food and circulating the discharged hot air back to the cooking chamber can reduce the heat loss of the convection heating unit to shorten the cooking time, set the temperature inside the cooking chamber There is an advantage that a separate heater for maintaining above can be omitted.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a convection microwave oven according to the present invention.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a perspective view showing a duct mounting structure of a convection microwave oven according to an embodiment of the present invention, Figure 2 is a side sectional view showing a convection microwave oven according to an embodiment of the present invention, Figure 3 is a present invention A cross-sectional view showing an air circulation path of a convection microwave oven according to an embodiment of the present invention.

1 to 3, a convection microwave oven according to an embodiment of the present invention is installed in the cabinet 10 to form a cooking chamber 32, and an inlet port 34, an exhaust port 36, and a circulation port 38 are provided. Is formed at the rear of the case 30, the inlet 34, the convection heating unit 50 for supplying hot air into the cooking chamber 32, and a part of the hot air discharged from the exhaust port 36. It includes a duct 70 for circulating inside.

When the cooking operation is started and the convection heating unit 50 is driven, the hot air is supplied into the cooking chamber 32 through the inlet 34, and thus the cooking operation is performed by the hot air. Through the cooking chamber 32 is discharged to the outside.

The hot air discharged through the exhaust port 36 is discharged to the outside of the cabinet 10 along the duct 70, and a part of the hot air is circulated back into the cooking chamber 32 through the circulation port 38. As a result, since the temperature inside the cooking chamber 32 can maintain the set temperature or more, the heat transfer efficiency of the convection heating unit 50 is improved.

Exhaust port 36 is formed on the upper side of the cooking chamber 32, the discharge port 12 is formed on the bottom surface of the cabinet 10, the hot air introduced into the duct 70 through the exhaust port 36 is the duct 70 Is moved downward along.

In addition, the duct 70 extends from the exhaust port 36 toward the discharge port 12 side of the cabinet 10 and communicates with the circulation port 38 formed in the lower portion of the cooking chamber 32 so that the duct 70 extends downward along the duct 70. A portion of the hot air moved to the inlet flows into the lower side of the cooking chamber 32 through the circulation port 38.

Therefore, since hot air is supplied to the lower sides of both sides of the cooking chamber 32 through which the hot air is difficult to be supplied, the inside of the cooking chamber 32 is evenly heated to reduce the heat loss of the convection heating unit 50.

The duct 70 is provided with a circulation fan 80 facing the circulation port 38 so that hot air moved downward along the duct 70 is moved toward the circulation port 38 so that the hot air can be easily circulated. It becomes possible.

The duct 70 as described above is provided with an expansion portion 72 having a wider cross-sectional area toward the discharge direction of the hot air to increase the cross-sectional area of the lower portion of the duct 70 to increase the exhaust area.

In addition, a portion of the hot air passing through the lower portion of the duct 70 is circulated by the circulation fan 80 to the cooking chamber 32 through the circulation port 38, and the remaining hot air is in contact with the duct 70 while the vortex is generated. Since the amount is increased, the temperature of the hot air discharged through the outlet 12 is lowered to prevent a safety accident.

In the initial stage when relatively high temperature hot air flows into the duct 70, the contact area between the hot air and the duct 70 is small, so that the amount of contact between the hot air and the duct 70 decreases, thereby reducing heat loss.

Looking at the operation of the convection microwave oven according to an embodiment of the present invention configured as described above are as follows.

First, when the cooking operation is started, the power is applied to the heater 52, the blower fan 54 is driven to supply the hot air into the cooking chamber 32 through the inlet 34, the cooking operation proceeds.

Hot air, which has been cooked in contact with food, is discharged to the outside of the cooking chamber 32 through the exhaust port 36, and moves downward along the duct 70 to be exhausted to the outside of the cabinet 10 through the discharge port 12. .

At this time, a part of the hot air moved downward along the duct 70 is circulated into the cooking chamber 32 through the circulation port 38, and moves downward along the duct 70 by the circulation fan 80. The hot air is smoothly supplied into the cooking chamber 32 through the circulation port 38.

Since the hot air circulated into the cooking chamber 32 flows into the lower side of the cooking chamber 32, the inside of the cooking chamber 32 is evenly heated, thereby reducing the heat loss of the convection heating unit 50.

In addition, since the hot air moved downward along the duct 70 is initially supplied into the duct 70, hot air is supplied into the duct 70 having a small cross-sectional area, so that the contact area between the hot air and the duct 70 is small. Heat loss is suppressed.

Subsequently, when the hot air is moved downward, the cross-sectional area of the duct 70 is increased by the expansion part 72, and vortices are generated in the hot air that has not passed through the circulation port 38, and thus the hot air and the duct 70 are separated from each other. As the contact area is increased, the temperature of the hot air discharged through the outlet 12 is lowered.

Therefore, it is possible to prevent a safety accident caused by the hot air discharged through the discharge port 12, and the exhaust area is widened by the expansion unit 72 can smoothly discharge the hot air moved along the duct (70). Will be.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand.

In addition, although the convection microwave oven has been described as an example, this is merely exemplary, and the duct of the present invention may be used in a product other than the convection microwave oven.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1 is a perspective view showing a duct mounting structure of a convection microwave oven according to an embodiment of the present invention.

2 is a side cross-sectional view showing a convection microwave oven according to an embodiment of the present invention.

3 is a cross-sectional view showing an air circulation passage of a convection microwave oven according to an embodiment of the present invention.

10 cabinet 12 outlet

30: case 32: cooking chamber

34 inlet port 36 exhaust port

38: circulation port 50: convection heating unit

52: heater 54: blowing fan

70: duct 72: extension

80: circulation fan

Claims

A case installed in the cabinet to form a cooking chamber, and an inlet, an exhaust port, and a circulation port are formed;

A convection heating unit installed at a rear side of the inlet port to supply hot air into the cooking chamber; And

And a duct for circulating the hot air discharged from the exhaust port into the cooking compartment.

The method of claim 1,

And the duct extends from the exhaust port side to the outlet port side of the cabinet and communicates with the circulation port.

The method of claim 2,

Convection microwave oven, characterized in that the duct is provided with a circulation fan opposed to the circulation port.

The method according to any one of claims 1 to 3,

Convection microwave oven, characterized in that the duct is provided with an extended portion is widened in the discharge direction of the hot air.