MX2009002671A

MX2009002671A - Cooking apparatus.

Info

Publication number: MX2009002671A
Application number: MX2009002671A
Authority: MX
Inventors: Keun-Jae Hwang
Original assignee: Lg Electronics Inc
Priority date: 2006-09-12
Filing date: 2006-12-07
Publication date: 2009-03-24
Also published as: EP2064492A4; EP2064492A1; CN101512231A; CN101512231B; KR20080024022A; EP2064492B1; RU2009113626A; RU2424471C2; WO2008032898A1

Abstract

In order to provide a cooking apparatus capable of preventing heat generated from a cooking cavity from being transferred to the outside of a door or to a handle, the present invention discloses a cooking apparatus, comprising: a cooking cavity; and, a door opening and closing the cooking cavity and including a front plate, a door frame located at the rear of the front plate to block microwaves and a middle plate located between the front plate and the door frame to block heat transferred from the cooking cavity to the front plate.

Description

COOKING APPARATUS TECHNICAL FIELD The present invention relates to a cooking appliance in general, more specifically a cooking appliance provided with a middle plate for blocking the transfer of heat from a cooking cavity to the outside of a door or to a handle.

TECHNICAL BACKGROUND The pending Korean patent application No. 2005-0083504 describes a typical example of a cooking appliance having its main components including a magnetron, a high voltage transformer, a high voltage capacitor and a cooling fan provided on one side of the cooking cavity. Korean pending patent application No. 2006-0037003 discloses a cooking appliance having its main components including a magnetron, a high voltage transformer and high voltage capacitor installed on the upper side of a cooking cavity and housing an assembly Convection heater in the back wall of the cooking cavity. The pending Korean utility model application No. 1999-0010444 describes a cooking appliance having its main components including a magnetron, a high-capacity transformer voltage and a cooling fan and an operating panel provided in the lower area of a cooking cavity. Additionally, the pending Korean utility model application No. 1998-0016489 discloses a cooking appliance having its main components including a magnetron, a high-voltage transformer and a cooling fan installed in a side wall of a cooking cavity and which is provided with a cooling flow path starting from the upper wall of the cooking cavity to a lateral side thereof. Korean pending patent application No. 1998-0053939 discloses a door of a microwave oven used as a typical example of cooking appliances, in which the door is provided with a door structure to block the microwaves and an induction cover that surrounds the door structure. The pending Korean patent application No. 1995-0003729 discloses a cooking appliance having a cooking flow path starting from a side side of a cooking cavity, going towards the lower side of the cooking cavity, towards the door. Korean pending patent application No. 2004-0108050 describes an example of an operation panel for use in a cooking appliance, in which the operation panel is provided with a glass tactile keyboard that uses static electricity.

BRIEF DESCRIPTION OF THE INVENTION Technical problem It is an object of the present invention to provide a cooking apparatus capable of preventing the heat generated from a cooking cavity from being transferred to the outside of a door or to a handle. Another object of the present invention is to provide a cooking appliance capable of cooling the interior of a door using air flow and a stagnant air layer. Still another object of the present invention is to provide a cooking appliance capable of cooling the interior of a door using an air flow generated from the rear space of the cooking appliance. Still another object of the present invention is to provide a cooking appliance capable of cooling the interior of a door using a flow of air generated from the rear space of the cooking appliance. Still another object of the present invention is to provide a cooking appliance provided with a door that is developed to allow a user to see inside a cooking cavity and able to block heat transfer to the outside of the door to the handle. Still another object of the present invention is to provide a cooking apparatus capable of preventing the heat generated from a cooking cavity from being transferred to a control panel provided to a door.

Still another object of the present invention is to provide a cooking apparatus that forms a cooling flow path from a cooking cavity to a door and that is able to prevent foreign substances from entering the door through the route of cooling flow.

Technical solution To achieve the above objects and their advantages, a cooking appliance is provided, comprising: a cooking cavity; and a door that opens and closes the cooking cavity and that includes a front plate, a door structure located in the rear door of the front plate to block microwaves and a middle plate located between the front plate and the door structure to block the heat transferred from the cooking cavity to the front plate. In another aspect of the present invention, the cooking appliance comprises a flow path formed to pass through at least one of the outer surfaces of the cooking cavity and the door is provided with an opening for communication with the flow path. In another aspect of the present invention, the flow path extends from the back of the cooking cavity to the upper portion of the cooking cavity and the opening is formed in the upper portion of the door to communicate with the flow path . In another aspect of the present invention, the door is provided with a door flow path formed such that a flow that comes outside the opening pass through at least one of the side surfaces of the middle plate. In another aspect of the present invention, the door flow path is formed so that the flow that comes out of the opening passes between the front plate and the middle plate. In another aspect of the present invention, the door is provided with a bracket for guiding the flow coming out of the opening toward the at least one of the side surfaces of the middle plate. In another aspect of the present invention, the bracket is located on the middle plate. In another aspect of the present invention, the opening is provided with means for preventing foreign substances from entering the door. In another aspect of the present invention, a cooking appliance is provided, comprising; a cooking cavity; and a door that opens and closes the cooking cavity and that includes a control panel provided with an opening to allow a user to see the interior of the cooking cavity; and a middle plate located over the opening of the door panel to block heat generated from the cooking cavity. In another aspect of the present invention, the middle plate is made of a material that allows a user to see the inside of the cooking cavity.

In another aspect of the present invention, the door is provided with a front plate mounted on the door panel to cover at least the opening and is made of a material so that a user is able to see the interior of the cooking cavity to through the opening of the door panel and a door structure mounted to the door panel for blocking microwave from the cooking cavity and having a part made of a material so that a user is able to see the inside of the cooking cavity through the opening of the door panel. In another aspect of the present invention, the part includes an induction cover located at the rear of the door structure and provided with a first opening for passing a flow towards the door and a second opening formed to allow a user to see the interior of the cooking cavity. In another aspect of the present invention, the door is provided with a door flow path formed to pass through at least one of the side surfaces of the middle plate. In another aspect of the present invention, the door is provided with a front plate mounted on the door panel to cover at least the opening; and a door flow path formed to pass between the front plate and the middle plate. In another aspect of the present invention, the door is provided with a control panel located in the upper portion of the door panel opening.

In another aspect of the present invention, there is provided a cooking appliance comprising: a cooking cavity carrying out a cooking process using microwaves; a door that opens and closes the cooking cavity and provided with a door structure that blocks the microwaves; an extended flow path from the cooking cavity side to the door side for a flow to pass over it; and an induction cover formed in the door and provided with a first opening communicating with the flow path side of the cooking cavity and preventing foreign substances from entering the door, and a second opening formed to expose the door structure. In another aspect of the present invention, the cooking appliance also comprises a door panel that mounts the door structure and provided with an aperture formed so that the flow passes therethrough. In another aspect of the present invention, the cooking appliance also comprises a middle plate located in the opening and which blocks the heat generated from the cooking cavity. In another aspect of the present invention, the induction cover is formed so that the induction cover of the first opening side and the induction cover of the second opening side are made separately. In another aspect of the present invention, a cooking appliance is provided, comprising: a cooking cavity carrying out a cooking process using microwaves; a door that opens and closes the cooking cavity and which is provided with a door structure to block the microwaves; a flow path extending from the cooking cavity side to the door side so that a flow passes over it; a door panel that mounts the door structure and is provided with an aperture formed so that the flow passes therethrough; a middle plate located above the opening and which blocks the heat generated from the cooking cavity; and an induction cover formed in the door and provided with a first opening communicating with the flow path of the cooking cavity side, and a second opening formed to expose the door structure; wherein the middle plate, the door structure and the induction cover are mounted on the door panel so that the flow forms a flow path from the door side that passes from the first opening of the induction cover, through the portion top of the door structure, through at least one of the side surfaces of the middle plate. Additional aspects and / or others and advantages of the present invention will be set forth in part in the description that follows and in part will be apparent from the description or can be elucidated by the implementation of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above aspects and features of the present invention will be more apparent when describing the embodiments of the present invention with reference to the accompanying drawings, in which: Figure 1 is a schematic exploded view of the main structure of a cooking apparatus of according to the present invention; Figure 2 schematically shows an example of the rear space of a cooking appliance according to the present invention; Figures 3 and 4 schematically show these examples of the rear space of a cooking appliance according to the present invention; Figures 5 and 6 schematically show a cooling flow path according to the present invention; and Figures 7 to 9 schematically show an example of a door according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail hereinafter with reference to the accompanying drawings.

Figure 1 is a schematic exploded view of the main structure of a cooking appliance according to the present invention showing a cooking cavity 100, a door 200, an upper space 300 located above the cooking cavity 100, a space rear 400 located at the rear of the cooking cavity 100, side spaces 500 located on either side of the cooking cavity 100 and a lower space 600 located under the cooking cavity 100. The cooking cavity 100 is a space for cooking food and is defined by an inner box 1 10. A heater 120 is provided in the upper portion of the interior of the cooking cavity 100 and a plate or grid 130 is placed inside the cooking cavity 100. The inner box 1 10 includes an inlet (not shown) and a 1 1 1 outlet formed sideways to form an air flow path to remove heat and odors within cooking cavity 100. An example of lime entador 120 is a pod heater. The use of the plate 130 in replacement of a circular turntable changes the width and length (depth) of the cooking cavity 100, the modification of which is restricted with the turntable. On one side of the cooking cavity 100 there is provided a guide 140 for guiding the plate 130. additionally, on the front and back sides of the cooking cavity 100 which provide a front structure 150 and a rear structure 160, respectively, and the front structure 150 has an opening 151 to form a flow path between the upper space 300 and the door 200. The rear structure 160 also has an opening 161 formed in the upper side for communication with the rear space 400. The lower portion in the door 200 is hinged to the cooking cavity 100 so that the door 200 can open and close the cooking cavity 100. The door 200 is formed to cover the cooking cavity 100 and the upper space 200. The door 200 is composed of a handle 210, a front plate 220, an input detection unit 230, a door panel 240, a control panel 250, a middle plate 260, a bracket 270, a door structure 280 and an induction cover 290. The handle 210 is a part that a user uses to open and close the door 200 and can be fixed to the front plate 220 by bolts (not shown). Preferably, the handle 210 has at least one channel (not shown) formed therein along its longitudinal direction so that the channel is communicated with the outside, so that the total weight can be reduced and the amount of heat transferred from the cooking cavity 100 during cooking can be reduced to a minimum. The faceplate 220 is preferably made of transparent glass so that the user is able to see the inside of the cooking cavity 100 and a display unit (not shown) including buttons can be attached or attached to it, the buttons being used so that the user selects a cooking course or for the indication of an operating state of the cooking appliance.

The input detection unit 230 is a part that recognizes which button is selected by the user. In case the input detection unit 230 is located on the back of the front plate 220 made of glass, it can be composed of a touch glass unit and function as an electrostatic sensor. The touch glass unit can be attached to the faceplate 220 using tape. The input detection unit 230 is located in the upper region of the door 200 facing the upper space 300 of the cooking cavity 100 and this structure ensures a wider cooking cavity and helps the user to easily see the interior of the cavity of cooking 100 without obstacles. The door panel 240 is a part that attaches other components 220, 250 and the like of the door 200 and has an opening 241 for the user to see the interior of the cooking cavity 100. Furthermore, the door panel 240 has in its lower side an outlet (not shown) through which the flow moving along an extended cooling flow path from a cooling fan 420 (to be described) to the door 200 is discharged through the upper space 300. The control panel 250 is a part for controlling the overall operation of the cooking appliance according to the input of a user. For this purpose, it cooperates with the input detection unit 230 and a relay substrate 350 (to be described) and is attached to the door panel 240 from the rear side of the input detection unit 230. Desirably, the control panel 250 is provided with a light emitting source such as an LED (light emitting diode) and irradiates the light emitted from the light emitting source to the display unit (not shown). The middle plate 260 is a fixed part to the door panel 240 while it is separate from the front plate 220 and the door structure 280, respectively. Its main function is to block the transfer of heat from the cooking cavity 100 to the front structure 220 and to the handle 210. Preferably, the middle plate 260 is installed in the door panel 240 so that a flow generated from the ventilator cooling 420 (to be described) enter the door 200 through the rear space 400 and the head space 300 and then move between the middle plate 260 and the front plate 220 under the guidance of a bracket 270 (to be described). Said flow flows through the outlet (not shown) of the door panel 240. The bracket 270 is fixed to the door panel 240 from the rear side of the control panel 250. It serves to protect the input detection unit 230 and the control panel 250, each including electronic, countervalue and microwave components of the cooking cavity 100 and against the flow of the cooling fan 420, and the flow can be moved between the door panel 240 and the front plate 220. The structure of door 280 is housed in the door panel 240 and serves to block the microwave leakage to the exterior of the cooking appliance. The induction hood 290 is a cover for the door 200 located towards the cooking cavity 100 and has an opening 291 formed in its upper side in correspondence with the opening 151 of the front structure 150. The opening 291 is preferably composed of small holes to prevent food or foreign substances from entering the door 200 while the door 200 is opening. The upper space 300 is a space above the cooking cavity 10 defined by an external box 310 and includes a heater 320, a waveguide 330, an insulating top plate 340 and a relay substrate 350. Optionally, a lamp (not shown) ) to illuminate the cooking cavity 100 can also be provided. The outer case 310 has a shape that encompasses the upper sides and both sides of the cooking cavity 100 at a distance away and is connected to the front structure 150 and the rear structure 160. If necessary, may have an outlet 31 so that a flow that has moved around the cooking cavity 100 and the heating elements installed in the suction apparatus may be vented to the outside. An example of heater 320 is a halogen heater. Since said heater 320 is influenced by the microwaves, unlike the heater 120 formed of a pod heater, the heater 320 is installed on the upper side of the inner casing 1 10 to provide heat down inside the cooking cavity 100. from above. The waveguide 330 extends from the rear space 400 to the headspace 300 and serves to provide generated microwaves from a magnetron (not shown) to the cooking cavity 100. To do this, a port 331 is provided on the upper surface of the cooking cavity (see Figure 2). The insulating upper plate 340 prevents the heat generated by the heater 120 housed in the inner case 1 10 from being transferred to the upper space 300 and has a shape that covers the upper portion of the cooking cavity 1 00 except for the heater 320 and the waveguide 330. The relay substrate 350 is mounted to the insulating top plate 340 from one side of the headspace 300 and works with the control panel 250 to operate components including a magnetron (to be described) positioned in the rear space 400). Figure 2 shows schematically an example of the rear space of a cooking appliance according to the present invention. Referring to Figures 1 and 2, the rear space 400 is a space behind the cooking cavity 100 defined by the cover 410 and includes a cooling fan 420, a convection heater assembly 430 and heating elements such as a magnetron 440 , a high-voltage transformer 450 and a high-voltage capacitor 460, together forming a compartment of components of the cooking appliance. The cover 410 is connected to the rear structure 160 of the outer case 310 to cover the upper space 300 and the rear space 400 and its lower portion is connected to a base 610. In the lower portion of the cover 410 or the base 610 is provided with an inlet 41 1 for the inflow of air to the cooling fan 420. The cooling fan 420 is located in the lower portion of the rear space 400 along the width direction thereof. and includes flow generating units 421 and 422 on both sides to cool the components installed on the upper side. As the rear space 400, the upper space 300 and the door 200 are integrated so that they communicate, the entire area of the cooking appliance can be cooled by the cooling fan 420. Additionally, the cooling fan 420 is provided with a dividing wall 423 to prevent the flow generated by the cooling fan 420 from flowing back to the cooling fan 420. The partition wall 423 has openings 424 and 425 formed on both sides so that the flow rises to the upper portion of the rear space 400. In space 426 between flow generating units 421 and 422 an engine (not shown) is provided to drive flow generating units 421 and 422. Figures 3 and 4 schematically show other examples of space application back of a cooking appliance according to the present invention. Referring to Figures 1-4, the rear space is provided in addition to the structure shown in Figure 2, with a flow guide 441 for guiding the air flow to the magnetron 440 and a flow guide 442 to guide the flow of air leaving the magnetron 440 to the inlet 1 12 that is formed on the side face of the cooking cavity 100. This structure, especially the flow guide 442, makes it possible to guide the air flow generated from the cooling fan 420 in the cooking cavity 100 in a stable and efficient manner and to effectively cool the magnetron, one of the central components. Convection heater assembly 430 includes a fan 431, a heater 432, an inner heater cover 433, an outer heater cover 434 and a motor 435. Desirably, a heat insulating material (not shown) is placed between the inner heater cover 433 and the outer heater cover 434 Said convection heater assembly 430 must have the motor 435. Since the motor 435 is installed as protruding backward from the rear space 400, the rear space 400 must have a passenger compartment that is deep enough to house at least the 435 motor Based on the attention to this space, said large volume component 440, 450 and / or 460 between the main components used in the operation of the cooking appliance can be placed in the rear space 400. Thus, although part of the cooking cavity 100 in the longitudinal direction is sacrificed, the cooking cavity 100 expands in the lateral and vertical direction. Also, by using a plate instead of a turntable, a cooking appliance according to the present invention can change the height, width and depth of the cooking cavity 100. Also, by placing the cooling fan 420 in the portion lower space 400, a cooking appliance according to the present invention can use the rear space 400 and can cooling the heating elements 440, 450 and / or 460 in the same way. Also, by providing the cooling fan 420 in the lower portion of the rear space 400 and creating the rear space 400, the headspace 300, the door 200, the cooking cavity 100 and the side spaces 500 when communicating with each other, the Full part of a cooking appliance according to the present invention can be effectively cooled by the cooling fan 420. Also, as the cooling fan 420 is installed along the width direction of the rear space 400, the heating elements as the convection heater assembly 430, the magnetron 440, the high voltage transformer 450, and the high voltage capacitor 460, which are provided in the rear space 400, can be effectively cooled, the flow can be displaced into the headspace 300, the side spaces 500 and the cooking cavity 100 and venting through an outlet 61 1 formed in the base in the lower position of the cooking cavity 100. Also by providing the dividing wall 423 and the openings 424 and 425, a cooking appliance according to the present invention can form the flow path and flow and cool the heating foods effectively and effectively . Also, the rear structure 160 may also comprise an opening 162 for communicating with the side space 500. The opening 162 allows a direct air flow from the rear space 400 to the side space 500 and creates an air flow to both sides of the rear space 400, thus promoting the cooling process and the air flow on both sides of the rear space 400.

The magnetron 440, the high-voltage transformer 450, and the high-voltage capacitor 460 are the main components used in the operation of the cooking appliance, each generating quite a lot of heat. The magnetron 440 is placed above the opening 424, while the high voltage transformer 450 and the high voltage capacitor 460 are placed above the opening 425. The arrangement of these heating foods can be changed. The lateral spaces 500 are spaces on either side of the cooking cavity 100 defined by the back box 100 and communicate desirably with the upper space 300, the rear space 400 and the lower space 600, and also with the cooking cavity 100 through the entrance 1 12 and the exit 1 1 1. The generated flow of the cooling fan 420 moves from the rear space 400, the upper space 300, the cooking cavity 100, the lateral spaces 500 and eventually to the lower space 600. At this moment, the flow that moves through the upper space 300 and which is directed towards the lateral space 500 can guide the flow that left the cooking cavity 100 through the outlet 1 1 1 to the lower space 600. The lower space 600 is a space below the cooking cavity 100 defined by the base 610. The base 610 is connected to the front structure 150 and the rear structure 160 to support the cooking apparatus and includes the outlet 61 1 to output the originating flow of the cooling fan 420 and the odor and heat generated in the cooking cavity 100. Although the lower space 600 is defined by the rear structure 160 of the rear side, the base 610 is connected to the cover 410 on the rear structure 160. Therefore, the base 610 also functions as a member for limiting the lower portion of the rear space 400. The location of the outlet 61 is not particularly limited by which can be on the side of the exit 1 1 1 or preferably in the center of the base 610 to give a sufficiently long flow path. Since the flow of hot air is vented through the outlet 61 1, the cooking appliance should not be placed on a kitchen appliance that is sensitive to heat. To protect said kitchen appliance from any damage due to overheated air, a plate (not shown) can be connected to the base 610 at a distance so that the heat can exit in lateral directions. Figures 5 and 6 schematically show a cooling flow path according to the present invention. As shown in the drawings, the flow generated from the rear space 400 is displaced to the lateral spaces 500 formed on both sides of the cooking cavity 100 by the upper space 300, while part of the flow leaves the opening 151 and rotates towards the door 200. Also, another part of the flow can rotate towards the lateral spaces through the opening 162 formed in the rear structure 160. The flow entering the upper space 400 cools the heater 320 and the relay substrate 350. Preferably, the relay substrate 350 is provided to the insulating top plate 340 along the flow direction to minimize the obstacle to flow. The flow passing through the side spaces 500 rotates towards the bottom space 600 and is vent through the exit 61 1 (see figure 1) formed in the center of the base 610. Although there is no particular restriction on the location of the outlet 610, it is preferably located around the center of the base 610 because a sufficient The amount of heat exchange takes place as the flow travels or circulates within the cooking appliance as long as possible. At this time, to protect a lower surface where the cooking appliance is placed, a protective plate 612 can be connected to the base 610 or at a distance so that the flow can exit in lateral directions. Additionally, the flow passing through the lateral spaces 500 guides the ventilated flow through the outlet 1 1 1 of the cooking cavity 100 to the lower space 600. On the other hand, the air flow coming through the opening 291 of the induction cover 290 moves between the front layer 220 and the middle plate 260 being guided by the bracket 270, and is vented through the outlet 242 formed in the lower surface of the door panel 240. As such, the unit Inlet detection 230 (see figure 1) and control panel 250 (see figure 1) covered by bracket 270 can be protected from heat and air flow, one side of midplate 260 blocks heat through the flow of air (although the air flow is blocked by the bracket 270, the air flow operates to block heat transfer to the input sensing unit 230 and the control panel 240) and the other side of the middle plate 260 locks the heat through a layer of stagnant air As a result, the heat generated from the cooking cavity 100 is blocked and is not transferred to the exterior of the door 200 or to the handle 210 (see Figure 1).

Figures 7 to 9 schematically show an example of a door according to the present invention, in which the door includes a faceplate 220, an input detection unit 230, a door panel 240, a control panel 250, a middle plate 260, a bracket 270, a door structure 280 and an induction cover 290. The faceplate 220 has a button-type deployment unit 221 and the deployment unit 221 and the input detection unit 230 constitute an operating panel. The door structure 280 includes a door screen 281 and an induction unit 282 for blocking microwaves and are hinged to the cooking cavity side through a hinge H under the door screen 281. Additionally, the faceplate 220, the middle plate 260, and the door screen 281 are made of transparent materials such as glass or plastic and the port panel 240 and the induction hood 290 have openings 241 and 292, so that a user can be able to see the inside of the cooking cavity. Additionally, light emitting sources 251 and 252 as LEDs are provided to the front side of the control panel 250 to illuminate the display unit 221. For this purpose, openings 231, 232 and 242 through which light beams can pass are formed in corresponding portions in the input detection unit 230 and the door panel 240, respectively. The induction hood 290 also has an opening 291 through which a flow of air can be moved to cool the door. By separately forming the induction cover 290 on the side of the opening 291 of the induction hood 290 on the side of the opening 292, the door assembly efficiency can be improved. The middle plate 260 is mounted in the opening 241 of the door panel 240 on the opposite side of the front plate 220. The door structure 280 is mounted to the port panel 240 a predetermined distance away from the middle plate 260 on the opposite side of the front plate 220. The induction cover 290 is mounted on the door structure 240 to cover the induction unit 282 of the door structure 280, while that the door screen 281 of the door structure 280 is exposed to the opening 292 of the induction cover 290. The door panel 240 is provided with fixation projections 243 for use in the fastening of control panel 250 to the portions rear on both sides thereof and a fixing projection (not shown) for use in fastening the bracket 270 to encompass the rear portion and underside of the control panel 250 and has the middle plate 260 installed in its lower opening 241, leaving a predetermined space. The opening 241 formed in the door panel 240 is provided with a plurality of assembly hooks 244a and 245a and support units 244b and 245b protruding rearward, respectively. On the upper and lower sides of the opening 241 of the door panel 240, the support unit 244b is formed between a pair of assembly hooks 244a. Meanwhile, on both sides of the opening 241 of the door panel 240, an assembly hook 245a is provided in the upper portion and a support unit 245b is provided along the side toward the lower corner of the door. side. For the assembly hooks 244a and 245a and the support units 244b and 245b to support the front and rear surfaces of the middle plate 260, the space between the assembly hooks 244a and 245a of the support units 244b and 245b is preferred to be equal to a thickness of the middle plate 260. Additionally, the assembly hooks 244a and 245a and the support units 244a and 245b are preferred as being formed partially on the circumference of the opening 241 of the door panel 240 to minimize a resistance to the flow when the air flow enters and leaves the opening 241. Additionally, on one side (or both sides) of the rear portion of the door panel 240 is provided a cable guide unit 246 for guiding a cable connected to the control panel 250. Also, on the underside of the door panel 240 an opening 247 used for cable connection to the cooking cavity side is provided, an opening 248 used to insert / release a hinge H depending on the opening / closing of the door 200 and an outlet 242 through which it is ventilated. air that has passed through the door 200. As explained so far, a cooking appliance of the present invention is able to prevent the heat generated from a cooking cavity from being transferred to the outside of a door or to a handle. Also, a cooking appliance of the present invention is capable of cooling the interior of a door using air flow and a stagnant air layer.

Also, a cooking appliance of the present invention is capable of cooling the interior of a door using air flow generated from the rear space of the cooking appliance. Also, a cooking appliance of the present invention is provided with a door constructed to allow a user to see the interior of a cooking cavity and which is capable of blocking the transfer of heat to the exterior of the door or the handle. Also, a cooking appliance of the present invention is capable of preventing the heat generated from a cooking cavity from being transferred to a control panel located in a door. Also, a cooking appliance of the present invention forms a cooling flow path from a cooking cavity to a door and is able to prevent foreign substances from entering the door through the air flow path . Although the preferred embodiment of the present invention has been described, it will be understood by those skilled in the art that the present invention should not be limited to the preferred embodiment described, but that various changes and modifications may be made within the essence and scope of the present invention. as defined by the appended claims.

Claims

NOVELTY OF THE INVENTION CLAIMS 1 .- A cooking appliance comprising: a cooking cavity; and a door that opens and closes the cooking cavity and that includes a front plate, a door structure located on the back of the front plate to block microwaves and a middle plate located between the front plate and the door structure to block the heat transferred from the cooking cavity to the front plate. 2. - The cooking appliance according to claim 1, further characterized in that it also comprises: a flow path formed to pass through at least one of the outer surfaces of the cooking cavity; and wherein the door is provided with an opening communicating with the flow path. 3. - The cooking appliance according to claim 2, further characterized in that the flow path extends from the back of the cooking cavity to the upper portion of the cooking cavity, and the opening is formed in the portion top of the door to communicate with the flow path. 4. - The cooking appliance according to claim 2, further characterized in that the door is provided with a flow path of a door formed so that a flow exiting the opening passes through at least one of the side surfaces of the middle plate. 5. - The cooking appliance according to claim 4, further characterized in that the door flow path is formed so that the flow exiting the opening passes between the front plate and the middle plate. 6. - The cooking appliance according to claim 4, further characterized in that the door is provided with a bracket for guiding the flow leaving the opening toward the at least one of the side surfaces of the middle plate. 7. - The cooking appliance according to claim 6, further characterized in that the bracket is located on the middle plate. 8. - The cooking appliance according to claim 2, further characterized in that the opening is provided with means to prevent foreign substances from entering the door. 9. - A cooking appliance comprising: a cooking cavity; and a door that opens and closes the cooking cavity and that includes a door panel provided with an opening to allow a user to see the interior of the cooking cavity; and a middle plate located over the opening of the door panel to block the heat generated from the cooking cavity. 10. - The cooking appliance according to claim 9, further characterized in that the middle plate is made of a material that allows a user to see the inside of the cooking cavity. eleven . - The cooking appliance according to claim 10, further characterized in that the door is provided with a front plate mounted to the door panel to cover at least the opening and made of a material that a user is able to see the interior of the cooking cavity through the opening of the door panel, and a door structure mounted to the door panel for blocking microwave from the cooking cavity and having a part made of a material for a user to be able to see the inside of the cooking cavity through the opening of the door panel. 12. - The cooking appliance according to claim 1 1, further characterized in that the door includes an induction cover located at the rear of the door structure and provided with a first opening to pass a flow to the door, and a second opening formed to allow a user to see the interior of the cooking cavity. 13. - The cooking appliance according to claim 9, further characterized in that the door is provided with a door flow path formed to pass through at least one of the side surfaces of the middle plate. 14. - The cooking appliance according to claim 9, further characterized in that the door is provided with a front layer mounted to the door panel to cover at least the opening; and a door flow path formed to pass between the front plate and the middle plate. 15. - The cooking appliance according to claim 9, further characterized in that the door is provided with a control panel located in the upper portion of the door panel opening. 16. - A cooking appliance comprising: a cooking cavity carrying out a cooking process using a microwave; a door that opens and closes the cooking cavity and provided with a door structure that blocks the microwaves; an extended flow path from the cooking cavity side to the door side for a flow to pass over it; and an induction cover formed in the door and provided with a first opening communicating with the flow path on the side of the cooking cavity and preventing foreign substances from entering the door, and a second opening formed to expose the door structure. 17.- The cooking appliance in accordance with the claim 16, further characterized in that it also comprises: a door panel that mounts the door structure and provided with an aperture formed so that the flow passes therethrough. 18. The cooking appliance according to claim 17, further characterized in that it also comprises: a middle plate located in the opening and that blocks the heat generated from the cooking cavity. 19. - The cooking appliance according to claim 16, further characterized in that the induction cover is formed so that the induction cover of the first side of the opening and the induction cover of the second opening side are made separately. 20. A cooking appliance comprising: a cooking cavity carrying out a cooking process using microwaves; a door that opens and closes the cooking cavity and provided with a door structure to block the microwaves; an extended flow path from the cooking cavity side to the door side for a flow to pass over it; a door panel that mounts the door structure and is provided with an aperture formed so that the flow passes through it; a middle plate located in the opening that blocks the heat generated from the cooking cavity; and an induction cover formed in the door and provided with a first opening communicating with the flow path of the cooking cavity side, and a second open opening for exposing the door structure; wherein the middle plate, the door structure and the induction cover are mounted on the door panel so that the flow forms a flow path from the door side passing from the first opening of the induction cover, through the portion top of the door structure, through one of the side surfaces of the middle plate.