KR19980050350U - Microwave Interlock Mechanism - Google Patents

Abstract

The present invention discloses an improved interlock mechanism of a microwave oven.

Conventionally, since the door open monitor switch is composed of an expensive micro switch, there is a problem of increasing the cost of the microwave oven.

In the present invention, the door open monitor switch has a housing formed in the lock, a fixed plate fixed in the housing and connected to the microcomputer, and one end of the door open monitor switch is fixed to be spaced apart from the fixed plate in the housing and connected to the microcomputer. A leaf spring having contact projections for selectively contacting the fixed plate, one end of the leaf spring contacting the free end of the leaf spring, penetrating through the housing to protrude out of the front plate of the cabinet, and pressed by the closing of the door; It is equipped with a cover for opening and closing to prevent malfunction caused by foreign matters such as dust, and to reduce the cost of the microwave oven, while accurately detecting whether the door is opened or closed.

Description

Microwave Interlock Mechanism

The present invention relates to a microwave oven, and more particularly, an interlock mechanism for blocking the high frequency radiation and preventing the high frequency leakage to the outside when the door is opened during operation. ).

In FIG. 1, the microwave is placed on a tray T provided in a cavity K of a cabinet C, and then oscillated in a magnetron (not shown). A device for cooking by molecular resonance of food by irradiating food to be cooked with high frequency.

By the way, since the high frequency adversely affects the human body, the leakage to the outside of the cooking chamber must be completely blocked. Accordingly, the microwave oven is generally provided with an interlock mechanism for properly controlling the operation of the magnetron by supplying or cutting off power to the high voltage part depending on whether the door D for opening and closing the cooking chamber is opened.

2 and 3 show a conventional configuration of such an interlock mechanism. This is because when the door D is closed, the upper and lower hooks 6 and 7 provided at the free end side of the door D are locked to the locking hole H formed in the front plate P of the cabinet C. Each is fitted. The upper and lower hooks 6 and 7 are then moved downward by the hook springs 8 to elastically engage the locks 1 to secure the door D. The door open lever (5) hinged to the lock (1) is then rotated downward by the lower hook (7), so that the second interlock switch (4) and the door open monitor switch (door open monitor) By simultaneously contacting the contacts of the switch 9, the second interlock switch 4 and the door open monitor switch 9 are turned on, respectively, and the head 6a of the upper hook 6 contacts the first interlock switch 3. Press to turn on the first interlock switch 3 to supply power to the high voltage portion. In addition, the door open monitor switch 9 detects the closing of the door D.

At this time, the head 7a of the lower hook 7 first presses the contact point of the interlock monitor switch 2 so that the interlock monitor switch 2 is turned off and the first and second interlock switches 3) (4) is then pressed so it will not become a short.

However, such a conventional interlock mechanism has a problem of causing a cost increase of the product because the door open monitor switch 9 is composed of a micro switch. That is, since the door open monitor switch 9 merely detects whether the door D is opened or closed, only a minute voltage may be applied. However, the cost of the door open monitor switch 9 may be increased by employing a very expensive micro switch.

Although not shown separately, in order to solve the above problems, various structures are installed to replace the door open monitor switch, but in this case, foreign matter such as dust is attached to the contact portion of the structure so that the switching operation is not performed correctly for a long time. The problem did not arise and could not be a fundamental solution.

The object of the present invention is to provide a microwave interlock mechanism that can reduce the cost of the product by reliably detecting whether the door is opened or closed without configuring the door open monitor switch as a micro switch. To provide.

Another object of the present invention is to provide an interlock mechanism of a microwave oven which can effectively prevent foreign matter such as dust from being attached to the contact portion of the door open monitor switch.

In order to achieve the above objects, the microwave interlock mechanism of the present invention includes a lock installed in an electrical cabinet of a cabinet, a door open monitor switch installed on the lock and detecting whether a door for opening and closing a cooking compartment is opened and closed. First and second interlock switches installed on the lock to supply or cut off power to the high voltage section according to whether the door is opened or closed, an interlock monitor switch to sense the safe operation of the first and second interlock switches, and an elastic downward downward to the door. In an interlock mechanism of a microwave oven having an upper hook and an interlock monitor switch operating a first interlock switch and a lower hook operating a second interlock switch, the door open monitor switch being biased, A housing formed in the lock, a fixed plate fixed in the housing and connected to a micom, One end is fixed so as to be spaced apart from the fixed plate in the cavity by a predetermined distance, and is connected to the microcomputer and has a contact spring at its free end, which has contact protrusions for selectively contacting the fixed plate, and one end thereof contacts the free end of the plate spring And it penetrates through the housing to the outside of the front plate of the cabinet (button) which is pressed by the closing of the door, and characterized in that it comprises a cover (cover) for opening and closing the interior of the housing.

According to one preferred feature of the present invention, one end of the cover is integrally connected to one end of the housing, the locking projection is formed on the other end side of the housing, and the other end of the cover has a locking hole that the locking projection of the housing is elastically fitted The fixing piece is extended.

Accordingly, the present invention can accurately detect whether the door is opened or closed without configuring the door open monitor switch as a micro switch as in the related art, and also prevents foreign matter penetration such as dust, thereby reducing the cost and reliability of the microwave oven. It is effective for improvement.

1 is a perspective view of a typical microwave oven,

2 is a side view showing a conventional interlock mechanism;

3 is an excerpted side view taken along III of FIG. 2,

4 is a side view showing the interlock mechanism according to the present invention,

5 is a front elevational view taken along the line V of FIG. 4;

6 is a cross-sectional view taken along VI-VI of FIG. 4,

FIG. 7 is a cross-sectional view taken along the line VIII-VIII of FIG. 6.

<Description of the code | symbol about the principal part of drawing>

D: door P: front panel

H1, H2: upper and lower locking holes (of faceplate)

11: lock

12: door open monitor switch

13: housing (of door open monitor switch)

13d: Jaws (of housing) 15: Jamming (of housing)

16: fixed plate (door open monitor switch)

17: plate spring (of door open monitor switch)

17a: contact projection (of leaf spring) 17b: locking groove (of leaf spring)

18: button (of door open monitor switch)

19: Cover (of door open monitor switch)

20: fixing piece (of cover) 20a: locking hole (of fixing piece)

21: wire 22, 23: first and second interlock switch

24: interlock monitor switch

27, 28: upper and lower hooks

Hereinafter, a preferred embodiment of the microwave interlock mechanism according to the present invention will be described in detail with reference to the accompanying drawings.

3 and 4, the interlock mechanism of the microwave oven according to the present invention is provided with a lock 11 at the rear surface of the front plate P so that the interlock mechanism of the microwave oven is located in the electrical chamber R of the cabinet C. . Detecting whether the door (D) that opens and closes the cooking chamber (K) between the predetermined position of the lock 11, for example, between the upper locking hole (H1) and the lower locking hole (H2) of the front plate (P). The door open monitor switch 12 is installed.

The door open monitor switch 12 is simply a bar (D) only need to detect whether the opening and closing, according to the characteristics of the present invention is fixed to the lock 11 is connected to the microcomputer (not shown) of the microwave oven (not shown) 17) and a leaf spring having one end fixed to the lock 11 so as to be spaced apart from the fixed plate 16 at a predetermined distance, which is also connected to the microcomputer and having a contact protrusion 17a selectively contacting the fixed plate 16 at its free end side. One end is brought into contact with the free end of the leaf spring 17 and protrudes to the outside of the front plate P of the cabinet C and is pressed as the door D is closed to fix the leaf spring 17 to the fixed plate 16. And a button 18 for connecting.

However, in this case, the door open monitor switch 12 may be exposed to foreign substances such as dust, and thus may cause malfunction due to foreign matter attachment when used for a long time. Accordingly, the housing 13 including the door open monitor switch 12 is integrally formed in the lock 11, and the cover 19 is installed to open and close the inside of the housing 13 to open the door open monitor switch 12. Is not exposed to dust or the like.

That is, the fixing plate 16 is fitted on one side of the housing 13 with a first fixing slit 13b drawn from an upper end thereof, and a fixing protrusion having one end protruding from the housing 13. It is fixed in the housing 13 by being inserted between 14 and the opposing side wall. In addition, the leaf spring 17 is fixed by inserting a fixing end side into a second fixing slit (13c) drawn from the upper end on one side of the housing 13, the leaf spring 17 is a button ( 18) the free end side is elastically deformed about the fixed end as the axis, so there is a high possibility of flowing in the longitudinal direction. Accordingly, a locking groove 17b for inserting the locking jaw 13d of the housing 13 is formed at one side of the main surface of the leaf spring 17 to prevent the flow of the leaf spring 17. It is composed. The button 18 is movably inserted into and supported by a guide slot 13a formed on one side of the housing 13 and protrudes to the outside through the through hole S of the front plate P. .

Meanwhile, the cover 19 is configured such that one end thereof is integrally connected to one end of the housing 13 and rotated about the one end thereof to open and close the housing 13. To this end, as shown in FIGS. 5 and 6, a locking protrusion 15 is formed at an outer surface of the other end of the housing 13, and a locking protrusion 15 of the housing 13 is burnt at the other end of the cover 19. A fixing piece 20 having a locking hole 20a to be fitted into the sexual extension is formed.

Meanwhile, the stationary plate 16 and the leaf springs 17 are connected to the microcomputer, respectively, and both of them are connected to the microcomputer in the same configuration. For convenience, the leaf springs 17 will be described as an example. That is, as shown in FIG. 7, the wire 21 connected to the microcomputer and the core 21a of the wire 21 are plated at the front end of the fixed end side of the leaf spring 17 protruding to the outside of the housing 13. Two clips (clip: 17c) 17d, which are pressed and fixed to the spring 17, are formed at regular intervals, respectively, and are connected to the microcomputer through the wire 21, respectively.

On the other hand, the lock 11 at a position corresponding to the upper and lower locking holes H1 of the front plate P is provided with a high voltage transformer such as a high voltage trans and a magnetron depending on whether the door D is opened or closed. The first and second interlock switches 22 and 23 for supplying or blocking the first and second interlock switches 22 and 23 are respectively installed so that their contacts face upwards, and the first and second interlock switches (2) are disposed at positions opposite to the lower locking holes H2. 22, an interlock monitor switch 24 for monitoring whether the 23 operates normally is installed so that its contact faces the front side.

In addition, the lock 11 between the interlock monitor switch 24 and the second interlock switch 23 has a substantially L-shape for operating the second interlock switch 23 in cooperation with the lower hook H2 of the door D. The door open lever 25 is rotatably supported.

On the other hand, the door D is elastically locked to the lock 11 through the upper and lower locking holes H1 and H2 of the front plate P, thereby locking the door D and interlock monitor switch 24 and The upper and lower hooks 27 and 28 for manipulating the first and second interlock switches 22 and 23 are connected by the hook levers 26 so as to be movable upward and downward. The upper and lower hooks 27 and 28 are elastically biased downward by the hook springs 29.

When the door D is closed, the inventive interlock mechanism configured as described above moves the upper and lower hooks 27 and 28 upward in contact with the corresponding locking holes H1 and H2 of the front plate P. It is fitted in each locking hole (H1) (H2). Then, the button 18 of the door open monitor switch 12 is first pressed by contact with the door D. Accordingly, the leaf spring 17 elastically deforms its fixed end about its axis so that the contact protrusion 17a thereof is closed. It comes into contact with the fixed plate 16. Therefore, the door open monitor switch 12 is turned on, the microcomputer detects the closing of the door (D).

Next, the upper and lower hooks 27 and 28 are moved downward by the restoring elasticity of the hook spring 29, so that the head of the upper hook 27 presses the contacts of the first interlock switch 22, At the same time, the head of the lower hook 28 is pressed against the one end of the door open lever 25. Then, the door open lever 25 rotates the hinge downward to the axis to press the contact of the second interlock switch 23 to turn on at the same time. Accordingly, the first and second interlock switches 22 and 23 supply power to the high voltage unit. At this time, the interlock monitor switch 24 operated by the lower hook 28 monitors the operation of the first and second interlock switches 22 and 23, and when the door D is operated in the open state, a short (short) The circuit is configured to stop the operation of the microwave oven by opening a fuse.

On the other hand, when the door D is opened, the locking of the upper and lower hooks 27 and 28 is released and the switches 12, 22 and 23 are turned off by being separated from the locking holes H1 and H2 of the front plate P. (OFF) detects the opening of the door (D) and at the same time cut off the power supply to the high-pressure part.

As described above, according to the present invention, since the door open monitor switch is composed of parts which are inexpensive compared to the conventional micro switch, it is possible to accurately detect whether the door is opened or closed while significantly reducing the cost of the product compared to the conventional one. do. In addition, since the door open monitor switch is cut off from the outside, it is possible to reliably prevent malfunction caused by foreign matters attached.

Therefore, the present invention not only improves the stability and reliability of the operation of the microwave, but also has an excellent effect of reducing the cost.

Claims (3)

A lock installed in the electrical cabinet of the cabinet, a door open monitor switch mounted on the lock to detect whether the door is opened or closed, and first and second devices installed on the lock to supply or cut off power to the high voltage part according to whether the door is opened or closed. A two interlock switch, an interlock monitor switch for detecting a safe operation of the first and second interlock switches, an upper hook and an interlock installed on the door so as to be elastically biased to operate the first interlock switch while locking the door In the microwave interlock mechanism having a lower hook for operating the monitor switch and the second interlock switch, The door open monitor switch 12, A housing 13 formed on the lock 11, A fixed plate 16 fixed in the housing 13 and connected to the microcomputer; One end is fixed so as to be spaced apart from the fixing plate 16 in the housing 13 so as to be connected to the microcomputer, and a leaf spring having contact protrusions 17a selectively contacting the fixing plate 16 on its free end side. 17), One end of the button spring (17) is in contact with one end of the button (18) penetrates through the housing (13) and protrudes outside the front plate (P) of the cabinet (C) is pressed by the closing of the door (D) )and, Interlock mechanism of the microwave oven, characterized in that it comprises a cover (19) for opening and closing the interior of the housing (13). The method of claim 1, wherein one end of the cover 19 is integrally connected to one end of the housing 13, the locking projection 15 is formed on the other end side of the housing 13, the cover 19 Interlock mechanism of the microwave oven, characterized in that the fixing piece (20) having a locking hole (20a) is formed to extend at the other end of the engaging projection (15) of the housing (13). 2. The interlock mechanism of claim 1, wherein a locking groove (17b) for inserting a locking step (13d) of the housing (13) is formed at one side of the main surface of the leaf spring (17).