KR20180007903A

KR20180007903A - Steam Convection Oven

Info

Publication number: KR20180007903A
Application number: KR1020160089448A
Authority: KR
Inventors: 김성우
Original assignee: 김성우
Priority date: 2016-07-14
Filing date: 2016-07-14
Publication date: 2018-01-24

Abstract

The present invention relates to a steam convection oven, and more particularly, to a steam convection oven having a cooking chamber in which a space is divided by a boundary of a guide plate and a convection fan and a heating unit are accommodated in one space of the divided space. And a steam generating unit for supplying steam to the inside of the cooking chamber. The steam convection oven includes a cooking chamber having curved corners formed therein.

Description

[0002] Steam Convection Oven [0003]

The present invention relates to a steam convection oven having improved temperature uniformity inside a cooking chamber.

In general, the steam convection oven is provided with a so-called combi-type oven having a function of spraying high-temperature steam into the cooking cavity using high-temperature steam and controlling the humidity by the amount of steam, thereby preventing the food from being dried, And it has a multi-functional cooking oven which prevents the evaporation of flavor and aroma to maintain the taste and flavor of the dish.

The steam convection oven is constructed such that a steam generator for generating steam is installed outside the cooking chamber, and the steam generator supplies water to the inside of the steam generator through a direct water line, And is fed into the cooking cavity through the steam discharge pipe communicated with the cooking chamber to cook the food.

In addition, a separate heater and a convection convection fan are installed in the cooking chamber of the steam convection oven to further heat the steam supplied from the steam generator or spray the water in the direct water line to the heater to supply the generated steam to the inside of the oven, I have a way of forced circulation under optimal humidity conditions.

In addition, the cooking chamber inside the oven is provided with a blower guide plate for separating a space for cooking food and a space in which the convection convection fan is located, so that the residue of the food to be cooked in the cooking chamber prevents the convection convection fan from being contaminated.

The steam convection oven includes a water supply tank, an electric part such as a heater, a power supply part, and a substrate, and an electric part having an operation part for controlling the temperature and humidity in the cooking chamber, .

In most conventional steam convection ovens having such a configuration, it is important to maintain the temperature uniformity inside the cooking chamber by circulating air, that is, convection, in the cooking chamber by driving the convection fan, but in the conventional steam convection oven, In the case of relying only on the air circulation by the convection fan driving, the air flow inside the cooking chamber is not uniform, and the flow of air is concentrated on a specific part of the cooking chamber, resulting in deterioration of the cooking performance due to local temperature unevenness And it takes a long time to uniformly reach the temperature in the cooking chamber after the first operation, leading to a problem that the cooking time becomes long.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a steam convection oven capable of quickly increasing the temperature uniformity inside a cooking chamber.

According to the steam convection oven of the present invention, a curved portion is formed at the corners inside the cooking chamber, thereby forming a vortex in the circulating air flow, thereby rapidly increasing the temperature uniformity of the air in the cooking chamber.

FIG. 1 is a perspective view showing an example in which a corner is formed at a corner of one side wall of a cooking chamber according to the present invention.
FIG. 2 is a plan view showing an example in which a corner is formed at a corner of one side wall of a cooking chamber according to the present invention.
FIG. 3 conceptually shows a plan view of an example of a guide plate according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The steam convection oven includes a main body having an external appearance and having a cooking chamber therein, a door provided on a front side of the main body to open and close an open front of the cooking chamber, And a steam generator for supplying heat and steam to the inside of the cooking chamber of the main body.

The steam generator generates high-temperature steam when cooking food in the oven to supply heat and steam to the cooking chamber. The steam generator is not limited to a particular kind, Any known steam generator can be applied as long as it is a device or structure capable of producing high temperature steam. For example, there is a structure in which steam generated from a separately provided steam generator is supplied to the inside of the cooking chamber through a steam pipe communicated with the cooking chamber, or steam is generated by spraying water through a nozzle in a heating portion provided inside the cooking chamber Structure or the like.

The cooking chamber has a chamber structure in which a cooking object is placed in the main body and is cooked, and a space is divided by a boundary of the guide plate inside the cooking chamber, and a convection fan And a heating portion.

The convection fan circulates the air in the cooking chamber circulated by the heating unit to induce the convection. The convection fan can be any type of convection oven as long as it is normally used in a convection oven. A plurality of convection fan blades are arranged at regular intervals along the circumference and are engaged with the rotating shaft of the motor to perform rotational motion.

It is important for the steam convection oven according to the present invention to uniformly maintain the temperature uniform throughout the cooking chamber in order to uniformly cook the food to be cooked. To this end, the present invention is characterized in that a curved portion is formed at an inner corner of the cooking chamber to be. The vortex can be formed by changing the flow of air passing through this portion due to the curvature formed in the corner portion inside the cooking chamber, thereby increasing the air mixing efficiency inside the cooking chamber, thereby rapidly increasing the temperature uniformity .

Particularly, the steam convection oven of the present invention is not particularly limited, but it is preferable that the steam convection oven has a curvature formed in a vertical corner portion inside the cooking chamber. This is because, if the corner is bent at all corners of the cooking chamber, there are too many bent portions inside the cooking chamber, so that the washing is incomplete when the cooking chamber is automatically cleaned or the washing time is excessively long Particularly, when the curved portion is formed at the edge in the horizontal direction, cleaning of the curved portion is relatively difficult, and the synergistic effect in terms of temperature uniformity is insignificant as compared with the case where the curved portion is formed only in the vertical corner portion .

In addition, although the bending is not particularly limited with respect to the degree of bending, it is preferable that the angle of the protrusion is 190 to 270 degrees with respect to the inside of the cooking chamber. If the angle of the protrusion is less than 190 degrees, there is a problem that the vortex is not formed well in the air flow in the cooking chamber. If the angle of the protrusion is greater than 270 degrees, the air flow inside the cooking chamber is excessively inhibited, It is because you can drop the castle.

In the present invention, the guide plate guides the flow of air inside the cooking chamber and prevents contamination of the convection fan, the heat generating portion, etc. due to food in the cooking chamber. The guide plate has a plate structure having a predetermined thickness, But the present invention is not limited thereto. In the present invention, it is preferable that the guide plate has a structure in which at least one side end forms a curved surface or an inclined surface in order to smoothly guide the air flow at the end of the guide plate among the cooking chamber and improve the uniformity of the air flow as a whole. And a curved surface or an inclined surface is formed toward the space where the convection fan and the heat generating portion are accommodated.

The steam convection oven according to the present invention may further comprise a brushless direct current (BLDC) motor coupled to the convection fan and adapted to drive the convection fan by forward and reverse rotation, and a motor controller for controlling the position and speed of the BLDC motor Lt; / RTI >

The BLDC motor is composed of three windings (U, V, W) and a rotor. Voltages of high (H), low (L) and open (O) are alternately applied to the windings , And the magnetic force generated in the coil by the voltage drives the rotor of the motor to rotate. The brushless direct current (BLDC) motor is characterized by its excellent durability, noise, and long-time rotation because there is no brush in the brushless DC motor. In addition, the BLDC motor is compact in size in conjunction with the development of magnet technology, and has high control performance and efficiency, which can reduce the operation cost of the system.

The BLDC motor can be applied to both a system having a sensor and a system without a sensor, but in the present invention, it is preferable to use a sensorless BLDC motor. By using sensorless BLDC motors, it is possible to omit sensor parts such as Hall-effect sensors and optical sensors, which can lower the cost of the product and expose the sensor to a vulnerable environment such as a situation where heat is applied This is because there is an advantage that product defects due to erroneous operation of the sensor that can occur can be prevented.

It is important that the steam convection oven of the present invention uniformly maintains the air flow inside the cooking chamber in order to uniformly cook the food to be cooked. Accordingly, in order to increase the uniformity of the air flow inside the cooking chamber, the BLDC motor So that the rotational motion of the convection fan is preferably driven by the forward and reverse rotation conversion.

In the present invention, the motor control unit controls the position and speed of the BLDC motor in order to realize a rapid accurate forward / reverse rotation of the convection fan. In the case of a sensor-based system, a sensor such as a hall- Can be used to control the position and speed of the BLDC motor.

However, when the BLDC motor is a non-sensor BLDC motor, the motor controller preferably detects a zero-crossing point of the back electromotive force to control the position and speed of the sensorless BLDC motor. The waveform of the counter electromotive force generated in the three windings of the sensorless BLDC motor is shown as a function of position and speed. The back electromotive force characteristic of such a motor can be measured by using a resistance distribution circuit or OP AMP (Operational Amplifier). The zero-crossing point of the counter electromotive force means the moment when the counter electromotive force of the voltage non-energized phase becomes zero.

The non-sensor BLDC motor and its driving circuit will be described in detail as follows. The power supply unit on the driving circuit converts an AC voltage, which is a commercial power supply, into a DC voltage, and the switching device driver receives a DC voltage converted from the power supply unit to generate a switching control signal. The switching device converts the DC voltage received from the power supply unit into a three-phase voltage in accordance with the switching control signal, and applies the three-phase voltage to the motor. By the three-phase voltage, the winding of the motor generates a magnetic field to rotate the rotor of the motor, and the rotor of the motor rotates to drive the convection fan.

A counter electromotive force is output to the winding according to the rotation of the motor rotor. The counter electromotive force detecting unit detects the counter electromotive force and applies the counter electromotive force to the motor control unit composed of a microcomputer. In accordance with the detection of the counter electromotive force, the motor control unit controls the switching element driving unit so that the motor is accurately operated. The motor control unit receives a current value applied to the motor from an overcurrent detecting unit that detects a current from the switching device, detects a voltage applied to the motor control unit from a voltage detecting unit that detects a voltage of the power source unit, The power supply of the power supply unit is turned off, thereby stably operating the motor.

In the driving of the sensorless BLDC motor, the position and speed of the rotor are detected using the counter electromotive force detected by the counter electromotive force detecting unit. The counter electromotive force is a function related to the rotational speed of the rotor, and it is impossible for the counter electromotive force detecting section to detect the counter electromotive force at the time of stop or low speed rotation. Therefore, it is necessary for the drive circuit of the sensorless BLDC motor to arbitrarily rotate the motor until the speed of the counter electromotive force detecting section reaches a level at which the counter electromotive force can be stably detected. Therefore, it is preferable that the motor control unit according to the present invention includes a program for controlling the speed of the non-sensor BLDC motor at a speed at least capable of generating counter electromotive force. In order to realize a rapid and accurate forward / reverse rotation conversion of the convection fan, it is necessary to prevent a step-out phenomenon of a back electromotive force waveform caused by a sudden change in motor load. To this end, It is preferable that a program for correcting the waveform termination of the counter electromotive force generated at the time of conversion is incorporated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. The following description of the drawings is merely an example for facilitating understanding of the present invention, and thus the scope of the present invention is not limited thereto.

FIG. 1 is a perspective view showing an example in which a corner is formed at a corner of one side wall of a cooking chamber according to the present invention. FIG. 2 is a perspective view of a cooking cavity according to an embodiment of the present invention, In a plan view.

1, curves are formed on both side edge portions 102 of the one side wall surface 101 of the cooking chamber according to the present invention. As shown in FIG. 2, both side edges 101 of the one side wall surface 101 of the cooking chamber A vortex can be formed in the air flow in the cooking chamber by the bending structure formed in the portion 102, thereby making it possible to increase the temperature uniformity of the air inside the cooking chamber.

FIG. 3 conceptually shows a plan view of an example of a guide plate according to the present invention. 3, the guide plate 150 according to an embodiment of the present invention has a structure in which both ends of the guide plate 150 form an inclined surface toward the space accommodating the convection fan 110 and the heat generating unit 120, It is possible to smoothly guide the air flow at the edge portion formed at the end portion of the plate to improve the uniformity of the air flow inside the cooking chamber.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It will be understood by those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit or scope of the invention as defined by the appended claims and their equivalents. .

100: a cooking chamber 101: a cooking chamber wall
102: Corner portion inside the cooking chamber 110: Convection fan (fan)
120: heat generating part 150: guide plate

Claims

A cooking chamber in which a space is divided by a boundary of a guide plate and a convection fan and a heating portion are accommodated in one space of the divided spaces; And
And a steam generating unit for supplying steam to the inside of the cooking chamber, the steam convection oven comprising:
Wherein the cooking chamber has a curved inner corner portion.

The method according to claim 1,
Wherein the cooking chamber is formed with a curved portion in a vertically inner corner portion thereof.

The method according to claim 1,
Wherein the bent portion has an angle of protrusion of 190 to 270 degrees with respect to the inside of the cooking cavity.

The method according to claim 1,
Wherein the guide plate has a structure in which at least one side end forms a curved surface or an inclined surface.

The method according to claim 1,
A brushless direct current (BLDC) motor coupled to the convection fan, the convection fan being driven by forward and reverse rotation; And
And a motor control unit for controlling the position and speed of the BLDC motor.

6. The method of claim 5,
Wherein the BLDC motor is a no-sensor BLDC motor.

The method according to claim 6,
Wherein the motor control unit senses a zero-crossing point of the back electromotive force to control the position and speed of the sensorless BLDC motor.