KR950013658B1 - Duct of electronic range - Google Patents

Abstract

a driving motor installed in an outside space corresponding to a vertical lower portion of a flap, the flap installed in an exit of an electronic range air intake duct; a driving unit including a pinion which is rotatably coupled with a motor shaft of the driving motor; a flap opening/closing unit whose upper end is coupled with a rear portion of the flip, while engaged with the pinion of the driving unit and into which a guide bar is inserted to move upwardly and downwardly according to the rotation of the pinion, thereby opening/closing the flap; and a driving motor controller installed in the outside wall of the air intake duct corresponding to moving distance upper limit point and lower limit point of the flap opening/closing unit, electrically connected to the driving motor and turned on/off according to the contact with the flap opening/closing unit, to thereby control the driving of the driving motor.

Description

Flap opening and closing device of intake duct for microwave

1 is a perspective view of an intake duct for a conventional microwave oven.

2 is a cross-sectional view showing the opening and closing operation of a flap of a conventional intake duct for a microwave oven.

3 is a cross-sectional view of the installation state of the flap opening and closing device of the intake duct for a microwave oven according to the present invention,

(a) is sectional drawing with the flap closed.

(b) is sectional drawing with a flap open.

4 is a drive motor control circuit diagram of the flap opening and closing apparatus of the intake duct for a microwave oven according to the present invention.

(a) is a circuit diagram which shows the state in which a flap was closed.

(b) is a circuit diagram which shows the operating state in which a flap is opened.

(c) is a circuit diagram which shows the state in which a flap was fully open.

(d) is a circuit diagram which shows the operating state in which a flap is closed.

* Explanation of symbols for main parts of the drawings

30: intake duct 32: flap

34: drive motor 38: pinion

40: driving means 42: guide rod

44: flap opening and closing means 46: drive motor control means

48: coupling piece 50: coupling protrusion

54: rack gear 56: operation

58: guide rod insertion groove 60: the first switch

62: second switch 64: controller

The present invention relates to a flap opening and closing device of an intake duct of a microwave oven, and more particularly, in an intake duct installed in a multifunctional microwave oven to guide the flow of air generated from a blower fan and introduced into a cavity. The present invention relates to a flap opening and closing apparatus for an intake duct for a microwave oven, wherein the flap opening and closing operation can be performed by a motor driving method.

In general, a magnetron is installed as a high-frequency generator, and separately, a heater is installed on the upper surface of the cavity, and thus, a multifunctional microwave oven capable of arbitrarily selecting heating means according to a cooking menu is shown in FIG. As shown in the figure, the side plate is provided with an intake duct 10 for guiding the wind generated from the blower fan into the cavity, such an intake duct 10 is configured such that the inlet side faces the blower fan side. At the exit toward the cavity, the flap 12 is hinged to the left and right side walls to keep the temperature in the cavity high while maintaining the closed state during cooking, and upon completion of cooking, it is opened by receiving a signal from a controller connected to a timer. By introducing wind, steam and soot generated during cooking can be discharged out of the cavity. The.

However, the flap opening and closing device in the microwave intake duct 10 is provided with a solenoid 14 on the outside of the intake duct 10, as shown in Figure 2, the operation of the solenoid 14 The rod 16 is inward and outward, and the tip of the operating rod 16 and the flap 12 of the solenoid 14 are connected to each other by the pull strap 18, while the flap 12 always acts in the closing direction. When the current is applied to the solenoid 14 by installing the spring 20 to be pulled the operating rod 16, so that the flap 12 can be opened, if the current applied to the solenoid 14 is cut off the operating rod ( 16) returns to its original position and at the same time the restoring force of the spring 20 acts to close the flap 12.

However, in the conventional flap opening and closing apparatus, there was a problem in that noise was generated largely during vertical movement of the operating rod 16 of the solenoid 14 for opening and closing the flap 12, and the flap 12 was opened. During the maintenance, the operating rod 16 must be pulled continuously, and for this purpose, since the current must be continuously applied to the solenoid 14, the problem of power loss is very serious, as well as the solenoid 14 by the application of the continuous current. If the phenomenon of overheating is repeated, there is a problem that the life is shortened.

The present invention is to solve the above conventional problems, coupled to the drive motor and the motor shaft of the drive motor is installed in the outer space corresponding to the vertically downward position of the flap provided on the outlet side in the microwave intake duct Drive means consisting of a rotating pinion, flap opening and closing means for opening and closing the flap while being engaged in a vertical motion in a state engaged with the pinion constituting the drive means, and installed at the upper and lower limit of the moving distance of the flap opening and closing means, respectively. Induction duct for the microwave by providing a flap opening and closing device consisting of a drive motor control means for controlling the drive of the drive motor while being "ON" or "OFF" by contact with the flap opening and closing means electrically connected to the drive motor. Flap can be opened and closed without any noise. Even if maintaining the state will bangdoen a manner that reduces the power loss by preventing the current applied.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

As shown in FIG. 3, the drive motor 34 is installed in the outer space corresponding to the vertically downward position of the flap 32 provided at the outlet side of the intake duct 30 for the microwave oven, and A flap (top) is engaged with a driving means (40) comprising a pinion (38) coupled to the motor shaft (36) of the drive motor (34) and a pinion (38) constituting the drive means (40). The flap opening and closing means 44 and the flap opening and closing means coupled to the rear surface of the 32 and the inside of the guide rod 42 is fitted to open and close the flap 32 while vertically moving in accordance with the rotation of the pinion (38) ( 44 are respectively installed on the outer wall of the intake duct 30 corresponding to the upper and lower limit of the moving distance, and are electrically connected to the driving motor 34 to be “ON” by contact with the flap opening and closing means 44. &Quot; OFF " and consists of drive motor control means 46 for controlling the drive of the drive motor 34. It has a built-in characteristic.

In the present invention as described above in the central portion of the back of the flap 32, the coupling piece 48 for coupling with the flap opening and closing means 44 integrally formed in a vertical direction, from one side of the coupling piece 48 Protrude the engaging projection (50).

On the other hand, in the present invention, the flap opening and closing means 44 is made of a rectangular pillar shape, the coupling hole 52 is fitted into the engaging projection 50 protruding on the coupling piece 48 of the flap 32 at the upper end thereof. ) Is formed, and a rack gear 54 engaged with the pinion 38 constituting the driving means 40 is formed in the vertical direction on one side of the body, and the body opposite to the rack gear 54. While the center 56 is in contact with the drive motor control means 46, the operation 56 is protruding, while the inner center of the body has a structure in which a guide rod insertion groove 58 of a predetermined depth is formed.

At this time, the guide bar 42 of a predetermined length is vertically installed and fixed to the lower wall on the same line as the guide rod insertion groove 58 formed in the body of the flap opening and closing means 44.

On the other hand, in the present invention, the drive motor control means 46, as shown in Figure 3, is installed on the outer wall of the intake duct corresponding to the upper limit on the vertical movement distance of the flap opening and closing means 44 1 switch 60 and the second switch 62 is installed on the outer wall of the intake duct corresponding to the lower limit, each of which is a controller 64 connected to a timer that is separately installed in the microwave to set the cooking time And a switching element 66 which receives a signal from the controller 64 and switches a current flow direction.

The operation of the present invention as described above is as follows.

As shown in FIGS. 3 (a) and 4 (a), the flap opening and closing means 44 is engaged with the pinion 38 which rotates in accordance with the rotation of the drive motor 34 and is raised while linearly moving to the flap ( 32 is closed, and at the same time, the first switch 60 constituting the drive motor control means 46 is "OFF" by the action of the inter-operation 56 protruding on one side of the flap opening and closing means 44. When the cooking completion signal in the cavity is applied to the switching element 66 from the controller 64 connected to the timer in the initial state in which the driving motor 34 is stopped, the switching contact is connected to the second switch as shown in FIG. The pinion 38 is rotated as the driving motor 34 is driven as a current flows in a direction connecting the second switch 62 and the driving motor 34 by being connected to the contact point of the switch 62. b) The flap opening and closing means 44 engaged with the pinion 38 is lowered as shown in FIG.

Thus, when the flap opening and closing means 44 descends and the operation | movement 56 touches the 2nd switch 62 at the lower limit, as shown in FIG. 4 (c), the 2nd switch 62 will As the current is "OFF", the flow of current is interrupted, and as a result, the driving motor 34 is stopped to keep the flap 32 open. At this time, the wind generated from the blowing fan flows into the cavity to cook. Water vapor, soot, etc. generated in the air is discharged out of the cavity.

From this state, when the cooking start signal is applied to the switching element 66 through the timer and the controller 64 connected with the timer, as shown in FIG. 4 (d), the switching contact of the switching element 66 is removed. The first switch 60 is "ON" as it is connected to the contact of the first switch 60, and thus the drive motor 34 is driven in the opposite direction as the flap opening and closing means 44 is lowered, thereby opening and closing the flap. The means 44 is raised to close the flap 32.

At this time, the up and down motion of the flap opening and closing means 44 is stably performed without the left and right shaking by the action of the guide rod insertion groove 58 formed in the body and the guide rod 42 inserted into the guide rod insertion groove 58.

According to the present invention, since the lifting operation of the flap opening and closing means is continuously performed by the operation of the drive motor and the pinion and the rack gear engaged with the pinion, there is an effect that noise is not generated. Since it is cut off, there is no power loss and lifespan can be prevented.

Claims (4)

Coupled to the drive motor 34 provided in the outer space corresponding to the vertically downward position of the flap 32 provided on the outlet side of the microwave intake duct 30, and the motor shaft 36 of the drive motor 34 The upper end is coupled to the rear surface of the flap 32 in a state in which it is engaged with the driving means 40 including the pinion 38 which rotates and the pinion 38 constituting the driving means 40, 42 is fitted to the flap opening and closing means 44 for opening and closing the flap 32 while moving up and down linearly in accordance with the rotation of the pinion 38, and the upper and lower limit of the moving distance of the flap opening and closing means 44 Respectively installed on the outer wall of the intake duct 30 and electrically connected to the driving motor 34 to drive the driving motor 34 while being "ON" or "OFF" by contact with the flap opening and closing means 44. For a microwave oven, characterized in that consisting of a drive motor control means 46 for controlling the Flap opening and closing device of the ducts. According to claim 1, wherein the flap (32) is formed integrally in the vertical direction with the coupling piece 48 for engagement with the flap opening and closing means 44 in the center of the back, one side of the coupling piece 48 The flap opening and closing device of the intake duct for a microwave oven, characterized in that it is formed by protruding the engaging projection (50). According to claim 1, wherein the flap opening and closing means 44 is made of a rectangular pillar shape, the coupling hole 52 is fitted into the engaging projection 50 protruding on the coupling piece 48 of the flap 32 ) Is formed, a rack gear 54 engaging with the pinion 38 constituting the drive means 40 is formed in the vertical direction on one side of the body, the drive motor in the center of the body opposite the rack gear 54 While the operation 56 is in contact with the control means 46 is protruding, the flap opening and closing device of the intake duct for a microwave oven, characterized in that the guide rod insertion groove 58 of a predetermined depth is formed in the inner center of the body. The first switch (60) and the lower limit of claim 1, wherein the driving motor control means (46) is provided on an outer wall of the intake duct (38) corresponding to an upper limit on the vertical movement distance of the flap opening and closing means (44). It consists of a second switch 62 is installed on the outer wall of the intake duct corresponding to the point, each of which is a signal from the controller 64 and the controller 64 connected to a timer that is separately installed inside the microwave to set the cooking time The flap opening and closing device of the intake duct for microwave ovens, characterized in that it is electrically connected to the switching element 66 for switching the current flow direction.