KR20100022196A - A vent grill opening/closing device and microwave oven compising the same - Google Patents

Abstract

PURPOSE: A vent opening/closing device and a microwave oven with the same are provided to prevent contaminant from flowing in a vent by preventing the vent from being exposed out by covering the vent with a vent cover. CONSTITUTION: A microwave oven with a vent opening/closing device comprises a vent frame(100), a vent cover(200), a drive motor, a driving force transmission member and a drive switch. The vent frame has a vent in which the air moves to inside and outside of the microwave oven. The vent cover opens and closes the vent. The drive motor offers the driving force for the rectilinear movement of the vent cover for opening and closing of the vent. The driving force transmission member transfers the driving force of the drive motor to the vent cover. According to opening and closing the drive switch of the vent cover, the drive motor is driven or stopped.

Description

A vent grill opening / closing device and microwave oven compising the same}

The present invention relates to a microwave oven, and more particularly to a vent opening and closing device for opening and closing of the vent opening and exiting the air in and out of the microwave oven and a microwave oven including the same.

Microwave ovens are cooking appliances that cook food using microwaves and / or heater heat. The front of the microwave oven is provided with a vent. The vent serves as an inlet and / or outlet for air entering and exiting the microwave oven.

However, such a microwave oven has the following problems.

The vent is generally provided at the front top or bottom of the microwave oven. Therefore, regardless of whether the air through the vent is exposed to the outside, there is a disadvantage that the aesthetics of the front appearance of the microwave oven is lowered.

In addition, when the vent is exposed to the outside, contaminants may be introduced into the microwave oven through the vent. Therefore, the components provided inside the microwave may be contaminated or the operation reliability of the microwave may be degraded.

The present invention is to solve the problems caused by the prior art as described above, an object of the present invention is to provide a vent cover opening and closing device configured to be exposed to the outside only when the vent is used and a microwave oven including the same.

Another object of the present invention is to provide a vent cover opening and closing device and a microwave oven including the same, which is configured to minimize the phenomenon that contaminants are introduced into the microwave through the vent.

According to an embodiment of the present invention for achieving the object as described above, the present invention provides a vent frame for venting air into and out of the microwave oven; A vent cover for opening and closing the vent; A driving motor providing a driving force for linear movement of the vent cover for opening and closing the vent; A driving force transmitting member for transmitting the driving force of the driving motor to the vent cover; And a driving switch for driving / stopping the driving motor according to opening and closing of the vent cover. It includes.

According to another embodiment of the present invention, the present invention provides a vent frame which is formed with a vent for introducing air into and out of the microwave oven; A vent cover for opening and closing the vent; A driving motor providing a driving force for linear movement of the vent cover for opening and closing the vent; A drive rack and a drive pinion for transmitting a drive force of the drive motor to the vent cover; A driving switch for driving / stopping the driving motor according to opening and closing of the vent cover; And guide member for guiding the movement of the vent cover; It includes.

According to another embodiment of the present invention, the present invention provides a vent frame including air vents formed in and out of a microwave oven; A vent cover for opening and closing the vent; A driving motor providing a driving force for linear movement of the vent cover for opening and closing the vent; A drive rack and a drive pinion for transmitting a drive force of the drive motor to the vent cover; A driving switch for driving / stopping the driving motor according to opening and closing of the vent cover; And a locking member to prevent the vent cover from being completely removed from the vent frame while the vent cover is opened. It includes.

According to another embodiment of the present invention, the present invention provides a cooking chamber; And a vent opening / closing device according to any one of claims 1 to 18, which is provided at one side of the main body and selectively opens and closes at least one vent through which air is blown in and out. It includes.

According to the vent cover opening and closing apparatus according to the present invention and the microwave oven including the same, there is an advantage that the front aesthetics of the microwave oven can be improved and the inflow of contaminants into the inside of the microwave oven can be prevented.

Hereinafter, a first embodiment of a microwave oven according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a perspective view showing a first embodiment of a microwave oven according to the present invention, Figure 2 is a perspective view showing the main portion of the first embodiment of the present invention, Figure 3 is an exploded perspective view showing the main portion of the first embodiment of the present invention to be.

First, referring to FIG. 1, the cooking chamber 3 is provided inside the main body 1 of the microwave oven. The cooking chamber 3 is a space in which food is cooked by microwaves and / or heater heat. The cooking chamber 3 is selectively opened and closed by the door 5.

The vent frame 100 is provided at the upper front end of the main body 1. Referring to FIG. 2, the vent frame 100 is formed in the vent frame 100. Referring to FIG. The vent 110 is a place where air is introduced into and out of the main body 1. In this embodiment, the bent frame 100 is formed in a flat tube shape in front and rear having a rectangular longitudinal section, and the vent 110 is formed inside the bent frame 100. However, the shape of the vent frame 100 and the vent 110 is not limited thereto.

A plurality of compartment ribs 120 are provided in the vent frame 100. The partition rib 120 partitions the vent 110 to the left and right. To this end, the partition ribs 120 are positioned on the vent hole 110 so as to be spaced apart from each other by a predetermined distance from side to side inside the vent frame 100. It is formed in a substantially rectangular plate shape corresponding to the longitudinal section in the direction orthogonal to the longitudinal direction of the bent frame 100. In this embodiment, the rear end of the compartment rib 120 is spaced apart from the rear end of the bent frame 100 by a predetermined distance. In addition, guide slots 121 are provided at lower ends of the partition ribs 120, respectively. The guide slot 121 is formed by cutting a portion of the lower end of the partition rib 120 in an L-shape opening toward the front.

On the other hand, the bottom surface of the bent frame 100 is provided with a plurality of guide protrusions 130. The guide protrusion 130 is positioned to be spaced apart from the left and right by a predetermined interval on the bottom surface of the bent frame 100 corresponding to the partition rib 120. The guide protrusion 130 is formed long in the front and rear on the bottom surface of the bent frame 100 so that the upper surface thereof is spaced apart from the upper end of the guide slot 121 by a predetermined interval. Therefore, a predetermined space is formed between the guide slot 121 and the guide protrusion 130. And in this embodiment, the guide protrusion 130 is formed to be inclined downward toward the front of the bent frame 100. Therefore, the space between the guide slot 121 and the guide protrusion 130 is gradually increased vertically toward the front.

Guide ribs 140 are provided at both inner sides of the bent frame 100, respectively. The guide ribs 140 are each formed long in the front and rear, and composed of a pair spaced apart from each other vertically. The guide rails 150 are provided between the guide ribs 140, respectively.

Meanwhile, the vent 110 may be selectively opened and closed by the vent cover 200. The vent cover 200 selectively opens and closes the vent 110 by linearly moving forward and backward of the main body 1 with respect to the vent frame 100. And the vent cover 200 opens and closes the vent 110 and at the same time the air discharged into and out of the microwave through the vent 110, in particular the air discharged to the outside of the microwave through the vent 110 It serves to guide upward. The vent cover 200 includes an opening and closing portion 210, a first guide portion 220, and a pair of second guide portions 230.

The opening and closing part 210 is formed in a plate shape corresponding to the left and right longitudinal cross-sections of the vent 110, that is, the front surface of the vent frame 100. The opening and closing portion 210 substantially opens and closes the vent 110. In addition, the opening and closing portion 210 is in a state of completely shielding the vent 110, and the rear edge thereof is in close contact with the front end of the bent frame 100.

The first guide portion 220 is formed in a plate shape corresponding to the cross section of the vent 110, that is, the bottom surface of the vent frame 100. The first guide part 220 extends rearward from the lower end of the rear surface of the opening and closing part 210. In more detail, the first guide portion 220 is spaced upward by a sum of the thickness of the bottom surface of the bent frame 100 and the thickness of the guide protrusion 130 at the bottom of the rear surface of the opening and closing portion 210. Extending rearward in position. The first guide portion 220 is positioned so that the opening and closing portion 210 completely shields the air vent 110, and the whole of the first guide portion 220 overlaps the vent frame 100. In addition, when the opening and closing part 210 completely opens the vent 110, the first guide part 220 overlaps the vent frame 100 vertically with the rear end part. When the vent cover 200 moves forward and backward, the first guide part 220 substantially slides along the space between the guide slot 121 and the guide protrusion 130.

The second guide portion 230 is formed in a shape corresponding to the front and rear longitudinal section of the vent 110, that is, the side surface of the vent frame 100. The second guide portion 230 extends rearward from both end portions of the opening and closing portion 210, respectively. More specifically, the second guide portion 230 extends rearward from the positions spaced inward by the thickness of the side surface of the bent frame 100 at both side ends of the opening and closing portion 210. At this time, the lower ends of the second guide portion 230 are spaced apart from the opposite sides of the first guide portion 220 by a predetermined distance, respectively. The second guide portion 230 slides along the guide rail 150 in the process of opening and closing the vent 110 by moving the vent cover 200 forward and backward. The second guide part 230 is positioned in such a manner that all of the second guide part 230 overlaps the vent frame 100 from side to side while the opening and closing part 210 completely shields the vent 110. In addition, when the opening and closing part 210 completely opens the vent 110, the second guide part 230 overlaps a part of a rear end of the second guide part 230 to the left and right of the vent frame 100.

In addition, the vent cover 200 is provided with a driving rack 240. The driving rack 240 extends rearward from the rear surface of the opening and closing portion 210. The drive rack 240 receives a driving force for linear movement of the vent cover 200 from the drive motor 300 to be described later.

The vent cover 200 including the opening and closing portion 210, the first guide portion 220, the pair of second guide portions 230, and the driving rack 240 may be integrally formed. For example, the vent cover 200 may be formed by injection molding.

A driving device is provided to linearly move the vent cover 200 to open and close the vent 110. 2 and 3, the driving device includes a driving motor 300, a driving pinion 400, a driving cam 500, a driving switch 600, and a fixing bracket 700.

The drive motor 300 provides a driving force for linearly moving the vent cover 200 to open and close the vent 110. The drive motor 300 is provided with a drive shaft 310. When power is applied to the drive motor 300, the drive shaft 310 rotates in the forward or reverse direction to rotate the drive pinion 400 and the drive cam 500. Hereinafter, the vent cover 200 moves forward in a straight direction to open the vent 110 in a forward direction, and the vent cover 200 moves backward in a straight direction, so that the vent cover 200 moves backward. The direction in which the driving shaft 310 rotates to shield the 110 is called a reverse direction.

The drive pinion 400 is coupled to the drive shaft 310. To this end, the drive pinion 400 is provided with a shaft insertion portion 410 into which the front end of the drive shaft 310 is inserted. The drive pinion 400 is gear-coupled to the drive rack 240. Therefore, when the drive shaft 310 rotates in the forward or reverse direction, the drive pinion 400 also rotates in the reverse or forward direction. When the drive shaft 310 rotates in the forward or reverse direction, the drive rack 240 rotates forward or backward to open or shield the vent 110 by the vent cover 200.

On the other hand, the drive cam 500 is rotated in the forward or reverse direction by the drive motor 300 to operate the drive switch 600 on / off. To this end, the drive cam 500 is provided with a shaft through portion 420 through which the drive shaft 310 passes. Therefore, the drive shaft 310 is inserted into the shaft insertion portion 320, that is, the drive pinion 400 in a state passing through the shaft through portion 420, that is, the drive cam 500. In addition, the driving cam 500 is provided with a driving unit 520. When the driving cam 500 rotates in the forward or reverse direction, the driving unit 520 turns on / off the driving switch 600 by pressing an actuator 610 to be described later. In addition, the driving cam 500 is provided with a stopper 530. The stopper 530 is rotated in the forward direction of the drive cam 500, that is, the forward direction of the drive shaft 310 in a state where the vent hole 110 is completely opened by the vent cover 200. Prevents rotation to In the present embodiment, the stopper part 530 is in close contact with one side of the third fixing part 740 to be described later in the state in which the vent cover 200 is completely opened by the vent cover 200. Rotation of the drive shaft 310 in the forward direction is prevented.

In addition, the driving switch 600 is turned on / off by the driving cam 500, more specifically, the driving unit 520. To this end, the drive switch 600 is provided with an actuator 610. The actuator 610 protrudes out of the driving switch 600 or is inserted into the driving switch 600 by the driving unit 520.

More specifically, in a state in which the vent 110 is shielded by the vent cover 200, the actuator 610 is pressed by the driving unit 520 to be inserted into the driving switch 600. Maintain state. Therefore, the driving switch 600 maintains the on-operation state. In addition, when the vent cover 200 moves forward and the vent 110 is opened, the actuator cam 610 rotates in the forward direction so that the actuator 610 protrudes out of the drive switch 600. Therefore, the driving switch 600 is turned off.

Meanwhile, the fixing bracket 700 is for fixing the driving motor 300 and the driving switch 600 to the upper surface of the main body 1. That is, the opening and closing device, the drive motor 300, the drive cam 700 and the drive switch 600 is fixed to the fixing bracket 700, thereby substantially the body 1 in the form of one unit It is fixed to the upper surface of. The fixing bracket 700 includes a first fixing part 710, a second fixing part 720, a fixing rib 730, and a third fixing part 740.

The first fixing part 710 is formed in a plate shape having a predetermined area, and is fixed in a state of being in close contact with the upper surface of the main body 1. One side of the first fixing part 710 is formed with a plurality of through holes 711 through which a fastener (not shown) for fixing to an upper surface of the main body 1 is formed.

The second fixing part 720 is for fixing the driving motor 300. The second fixing part 720 is provided on the left side of the first fixing part 710 in FIG. 2. In this case, the bottom of the second fixing part 720 is stepped upward compared to the first fixing part 710. This is for fixing the fixing rib 730, as will be described later.

The second fixing part 720 is provided with a motor seating space 721 in which the driving motor 300 is seated. The driving motor 300 is seated from the front to the rear in the motor seating space 721. In addition, the second fixing part 720 includes a motor support part 723 for supporting the driving motor 300 seated in the motor seating space 721. The motor support part 723 is formed in a shape corresponding to at least the outer surface of the driving motor 300 to be in close contact with one side of the outer surface of the driving motor 300, one side of the rear surface of the driving motor 300 in FIG. 2. The motor contact surface 725 is provided. In addition, the motor support 723 is provided with a fastening hole 727 to which the fastener S for fastening the fixed rib 730 is formed. A fixing slot 729 is formed on the bottom surface of the second fixing part 720. The fixing slot 729 is a portion into which the lower end of the fixing rib 730 is inserted.

The fixed rib 730 is fixed to the driving motor 300 which is mounted on the motor seating space 721 and supported by the motor support part 723. The fixed rib 730 is formed in a shape corresponding to the outer surface of the driving motor 300, that is, the front surface of the driving motor 300 in FIG. 2, and is in close contact with the front surface of the driving motor 300. A through hole 731 is formed at the upper end of the fixed rib 730. The through hole 731 of the fixed rib 730 is a place where the fastener S to be fastened to the fastening hole 731 of the motor support 723 passes. A locking protrusion 733 is provided at the lower end of the fixed rib 730. The locking protrusion 733 is caught by the bottom surface of the second fixing part 720 in a state where the lower end of the fixed rib 730 is inserted into the fixed slot 729, thereby lowering the lower end of the fixed rib 730. Is to prevent the phenomenon of being removed arbitrarily in the state inserted into the fixing slot 729.

The third fixing part 740 is provided on the left side of the drawing in FIG. 2 of the second fixing part 720. The driving switch 600 is seated on an upper surface of the third fixing part 740. In addition, a pair of fixing hooks 741 are provided on an upper surface of the third fixing part 740. The fixing hook 741 extends upward from both side ends of the upper surface of the third fixing part 740. The fixed hook 741 is for preventing the phenomenon that the drive switch 600 is arbitrarily removed in a state seated on the upper surface of the third fixing part 740. In addition, the fixing hook 741 is elastically deformed in the direction away from each other, that is, the left and right in the drawing in Figure 2 in the process in which the drive switch 600 is seated on the upper surface of the third fixing portion 740.

Hereinafter, the operation of the first embodiment of the microwave oven according to the present invention will be described in more detail with reference to the accompanying drawings.

4 and 5 is an operating state diagram showing a process of the vent cover opening and closing the vent according to the first embodiment of the microwave oven according to the present invention.

Referring to FIG. 4, in the state where the microwave oven does not operate, the vent 110 is shielded by the vent cover 200. Therefore, since the vent 110 is not exposed to the outside, the front aesthetics of the microwave oven body 1 are improved, and the phenomenon of being introduced into the body 1 through the vent 110 is prevented.

At this time, the opening and closing portion 210 is in close contact with the front end of the bent frame 100, the first guide portion 220 is positioned to overlap the bottom surface of the bent frame 100 up and down. In addition, the second guide portion 230 is positioned to overlap left and right sides of the bent frame 100. The actuator 610 of the driving switch 600 is pressed by the driving unit 520 of the driving cam 500 to maintain a state of being inserted into the driving switch 600. Therefore, the driving switch 600 maintains the off operation. In addition, the stopper 530 of the driving cam 500 maintains a state spaced apart from the third fixing part 740.

In this state, when the microwave oven is operated by the user's operation, the driving motor 300 rotates forward. Therefore, as shown in FIG. 5, the vent 110 is opened by linearly moving forward of the vent cover 200. Here, the operation of the microwave oven, for example, at least one of the operation for cooking food or hood operation to suck and discharge the combustion gas generated in the cooking process of the food in the cooking apparatus installed below the microwave oven. Means.

More specifically, the drive pinion 400 coupled to the drive shaft 310 of the drive motor 300 rotates in the forward direction, so that the drive rack 240 geared to the drive pinion 400 to move forward. do. In addition, the vent cover 200 moves forward by the movement of the driving rack 240, and the vent hole 110 is opened. At this time, the rear edge of the opening and closing portion 210 is spaced apart from the front end of the bent frame 100. The first and second guide parts 230 slide between the guide slots 121 and the guide protrusions 130 and along the guide rails 150, respectively, so that only a portion of each rear end part of the bottom surface of the vent frame 100 is moved. And overlap with both sides up and down or right and left.

In addition, when the drive shaft 310 of the drive motor 300 rotates in the forward direction, the drive cam 500 coupled thereto also rotates in the forward direction. In addition, the actuator 610 inserted into the driving switch 600 is pressed by the driving unit 520 by the rotation of the driving cam 500 in the forward direction, so that the actuator 610 is external to the driving switch 600. To protrude. Therefore, the driving switch 600 is turned on. In addition, the driving motor 300 is further driven in a forward direction for a predetermined time even when the driving switch 600 is turned on, so that the vent opening 110 is completely opened by the vent cover 200.

The driving of the driving motor 300 in the forward direction continues only until the stop portion 530 of the driving cam 500 comes into close contact with the front surface of the third fixing part 740. That is, even when the driving motor 300 is continuously driven in the forward direction in the state in which the vent 110 is completely opened by the vent cover 200, the driving cam 500 is the stopper 530. When it is in close contact with the front of the third fixing part 740 is no longer rotated in the forward direction. Therefore, in the state in which the vent 110 is completely open, the vent cover 200 is moved forward by the excessive rotation of the driving motor 300 to be removed from the vent frame 100. Is prevented.

When the vent 110 is opened as described above, air is introduced into and out of the microwave oven through the vent 110. In addition, when the operation of the microwave oven is finished, the driving motor 300 is driven in the reverse direction. Therefore, the vent 110 is shielded by the vent cover 200. The process of shielding the air vent 110 is performed in the reverse order of the process of opening the air vent 110 described above.

More specifically, when the drive motor 300 is driven in the reverse direction, the drive shaft 310 and the drive pinion 400 and the drive cam 500 coupled thereto rotates in the reverse direction. Therefore, in response to the rotation of the drive pinion 400, the drive rack 240 linearly moves to the rear. In addition, the vent cover 200 is moved to the rear by the movement of the driving rack 240, so that the vent hole 110 is shielded by the vent cover 200. In addition, when the driving cam 500 is rotated, the actuator 610 is inserted into the driving switch 600 by the driving unit 520, so that the driving switch 600 is turned off. In addition, the driving motor 300 is driven in the reverse direction for a predetermined time until the vent 110 is completely shielded by the vent cover 200 even when the driving switch 600 is turned off.

Hereinafter, with reference to the accompanying drawings a second embodiment of a microwave oven according to the present invention will be described in more detail.

6 and 7 are perspective views showing main parts of a second embodiment of a microwave oven according to the present invention. Detailed description of the same components as those of the first embodiment described above among the components of the present embodiment will be omitted.

6 and 7, guide ribs 840 are provided at both inner sides of the bent frame 800, respectively. The guide rib 840 has a L-shape and a B-shaped longitudinal section and is configured in a pair spaced apart from each other by a predetermined interval. A guide rail 841 is provided between one side surface of the bent frame 800 and the guide rib 840, respectively. The guide rail 841 is formed long in the front and rear in the same manner as the guide rib 840.

In addition, stoppers 843 are respectively provided on both side surfaces of the bent frame 800 corresponding to the front end of the guide rail 850. The stopper 843 is formed to protrude in a direction in which inner side portions of both sides of the vent frame 800 face each other. The stopper 843 serves to prevent the removal of the second guide part 930 to be described later. The stopper 845 may be located inside both side surfaces of the bent frame 800 corresponding to the guide ribs 840.

Meanwhile, a guide slot 931 is formed in the second guide part 930 of the vent cover 900. The guide slot 931 is formed by cutting a portion of the second guide part 930 in a forward and backward direction. The stopper 843 is positioned inside the guide slot 931. Therefore, when the second guide part 930 slides along the guide rail 850, the stopper 843 moves relative to the guide slot 931.

In addition, the second guide part 930 is provided with a locking rib 933. The locking ribs 933 may prevent the vent cover 900 from being completely removed from the vent frame 800. To this end, the locking rib 933 is located at the rear end of the second guide part 930 corresponding to the rear end of the guide slot 931. When the vent cover 900 is moved forward to open the vent 910 and the second guide part 930 slides forward along the guide rail 841, the locking rib 933 is stopped at the stopper. Close to 843. Accordingly, the phenomenon in which the second guide part 930 is removed from the guide rail 841 is prevented, and the phenomenon in which the vent cover 900 is completely removed from the vent frame 800 is prevented.

Within the scope of the basic technical idea of the present invention as well as many other modifications are possible to those skilled in the art, the scope of the present invention should be interpreted based on the appended claims. will be.

In the above-described embodiments, the vent hole through which air is introduced into and out of the microwave oven is provided at the upper end of the front plate, but the position of the vent hole is not necessarily limited thereto. That is, the vent hole may be directly formed in the vent hole or formed in a third member to be fixed to the upper end of the front plate or the inside of the vent hole.

According to the vent opening and closing device according to the present invention configured as described above and a microwave oven including the same, the following effects can be expected.

First, according to the present invention, it is selectively exposed to the outside depending on whether the vent is used. Thus, for example, by forming the entire surface of the microwave oven in the same texture, the appearance of the bottom appearance of the microwave oven is improved.

In addition, according to the present invention, it is possible to prevent the phenomenon that external pollutants are introduced into the microwave oven through the vent. Therefore, the contamination of the parts of the microwave oven caused by such pollutants and the malfunction of the microwave oven due to the contamination are prevented, thereby improving the durability and operation reliability of the product.

And in the present invention, the opening and closing device for opening and closing the vent is substantially made of one unit and installed in the microwave oven. Therefore, the production and repair of the microwave oven can be made more simple.

In addition, according to the present invention, the drive motor for providing a driving force for opening and closing the vent is continuously driven for a predetermined time even if the drive switch is turned on / off. Therefore, the time difference between the stop time of driving of the drive motor and the on / off operation time of the drive switch is compensated so that the microwave oven operates more accurately, thereby improving the operation reliability of the microwave oven.

1 is a perspective view showing a first embodiment of a microwave oven according to the present invention.

Figure 2 is a perspective view showing the main part of the first embodiment of the present invention.

Figure 3 is an exploded perspective view showing the main part of the first embodiment of the present invention.

4 and 5 is an operation state showing the process of the vent cover opening and closing the vent according to the first embodiment of the microwave oven according to the present invention.

6 and 7 are perspective views showing main parts of a second embodiment of a microwave oven according to the present invention;

Claims (21)

A bent frame having an air vent formed thereinto in and out of the microwave oven; A vent cover for opening and closing the vent; A driving motor providing a driving force for linear movement of the vent cover for opening and closing the vent; A driving force transmitting member for transmitting the driving force of the driving motor to the vent cover; And A driving switch for driving / stopping the driving motor according to opening and closing of the vent cover; Vent opening and closing device comprising a. The method of claim 1, And a drive cam that rotates by driving of the drive motor to drive the drive switch on / off. The method of claim 2, The drive cam, A driving unit to turn on / off the driving switch; And A stopper for preventing driving of the driving motor in a direction in which the vent is opened while the vent is opened; Vent opening and closing device comprising a. The method of claim 3, wherein The stopper part, the vent cover is in close contact with the vent opening and closing device which is in close contact with one side of the third fixing part in which the drive switch is fixed in a state that the vent opening is open. The method of claim 1, The driving motor, the air vent opening and closing device is stopped in the forward or reverse rotation when the operation is turned on or off in the state in which the drive switch is turned off. The method of claim 5, wherein The driving motor is stopped after the forward or reverse rotation continues for a predetermined time even if the drive switch is turned on or off in the off operation state. The method of claim 1, The driving force transmission member, the vent opening and closing device comprising a rack and pinion respectively coupled to the vent cover or the drive motor. The method of claim 1, The vent cover is a vent opening and closing device for guiding the air discharged to the outside through the vent upward or downward. The method of claim 1, The vent cover, Opening and closing portion is formed in a shape corresponding to the longitudinal cross-section of the vent in the direction orthogonal to the linear movement to open and close the vent; And A guide portion formed in a shape corresponding to a cross-section of the vent in a direction parallel to the linear movement for opening and closing of the vent; Vent opening and closing device comprising a. The method of claim 1, The vent cover, Opening and closing portion is formed in a shape corresponding to the longitudinal cross-section of the vent in the direction orthogonal to the linear movement to open and close the vent; A first guide part formed in a shape corresponding to a cross section of the vent in a direction parallel to the linear movement for opening and closing the vent; And A second guide part formed in a shape corresponding to a longitudinal section of the vent in a direction parallel to the linear movement for opening and closing the vent; Vent opening and closing device comprising a. The method of claim 10, The first and second guide portion, the vent opening and closing device overlaps at least a portion of the vent frame irrespective of whether the vent opening or closing. A bent frame having an air vent formed thereinto in and out of the microwave oven; A vent cover for opening and closing the vent; A driving motor providing a driving force for linear movement of the vent cover for opening and closing the vent; A drive rack and a drive pinion for transmitting a drive force of the drive motor to the vent cover; A driving switch for driving / stopping the driving motor according to opening and closing of the vent cover; And A guide member for guiding the movement of the vent cover; Vent opening and closing device comprising a. The method of claim 12, The guide member, A guide slot provided at any one of the bent frame and the bent cover, the guide slot being elongated in a linear movement direction of the bent cover; And A guide part installed on the other of the bent frame and the bent cover and moving along the guide rail when the bent cover moves linearly; Vent opening and closing device comprising a. The method of claim 13, The guide slot is formed by cutting a portion of the compartment ribs which are provided inside the bent frame and partitions the vent. The guide part vent opening and closing device provided on the bottom of the vent cover. The method of claim 14, The guide member, the ventilation opening and closing device further comprises a guide protrusion which is provided on the inner side of the bent frame corresponding to the partition rib, and forms a predetermined space between the guide slot. The method of claim 12, The guide member, A guide rail provided at any one of the bent frame and the bent cover, the guide rail being elongated in a linear movement direction of the bent cover; And A guide part provided in the other of the bent frame and the bent cover and sliding along the guide rail when the bent cover moves linearly; Vent opening and closing device comprising a. A bent frame having an air vent formed thereinto in and out of the microwave oven; A vent cover for opening and closing the vent; A driving motor providing a driving force for linear movement of the vent cover for opening and closing the vent; A drive rack and a drive pinion for transmitting a drive force of the drive motor to the vent cover; A driving switch for driving / stopping the driving motor according to opening and closing of the vent cover; And A locking member to prevent the vent cover from being completely removed from the vent frame while the vent cover is opened; Vent opening and closing device comprising a. The method of claim 17, The locking member, A stopper provided at any one of the bent frame and the bent cover; And A locking rib provided at the other of the bent frame and the bent cover and being in close contact with the stopper when the vent cover is linearly moved to open the vent; Vent opening and closing device comprising a. A main body provided with a cooking chamber; And A ventilation opening and closing device of any one of claims 1 to 18, provided on one side of the main body and for selectively opening and closing at least one ventilation opening and receiving air into and out of the main body; Microwave including a. The method of claim 19, The vent opening and closing device is provided in the front end of the microwave oven. The method of claim 19, The vent opening and closing device, the microwave oven to open the vent when at least one of the cooking operation and food operation of the food is made.

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