JPH0817571A - High-frequency heating device - Google Patents

Abstract

PURPOSE:To provide a simplified door body closing structure without damaging a microwave leakage prevention effect by eliminating the superposition of a cutout section formed on the internal wall of a choke groove and a door arm. CONSTITUTION:The fixing position of a catch pin 4 on the side of a door body 3 is established approximately at the center of cutout sections 6a and so forth arranged at every prescribed interval on a periodic structure 6 forming the internal wall of a choke groove inside the fixing position. The end of a door arm 5 projected from outer housing 1 is hooked to the catch pin 4 from a direction approximately orthogonal with the door body 3, thereby preventing the door arm 5 from being superposed on any of the sections 6a and so forth. Then, the base end of the door arm 5 is energized with a tension spring 51, thereby keeping the door body 3 in closed state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a door which opens and closes a front surface of a heating chamber in a high frequency heating device.

[0002]

2. Description of the Related Art In a high frequency heating apparatus for heating an object to be heated introduced into a heating chamber by the action of microwaves radiated inside the heating chamber, a heating chamber is introduced for introducing and leading the object to be heated. A door is provided on the front of the so that it can be opened and closed. In order to prevent microwaves from leaking to the outside during the heating operation, the door body is provided with a sealing surface that is in close contact with the front wall of the heating chamber when closed, and a choke groove is formed in a manner that goes outside the sealing surface. A leak prevention structure is provided around which a microwave is leaked through a slight gap between the sealing surface and the front wall and is attenuated during propagation along the choke groove.

Further, as disclosed in Japanese Examined Patent Publication No. 62-49714, etc., a leak preventing effect is enhanced by arranging a plurality of notches having a predetermined width on the peripheral wall of the choke groove side by side at regular intervals. It is known that in many high-frequency heating devices, this kind of leakage prevention structure, that is, leakage prevention in which a plurality of notches are provided at predetermined intervals on the peripheral wall of the choke groove that is provided outside the sealing surface The structure is adopted.

With the improvement of the leakage prevention structure as described above, in the recent high-frequency heating apparatus, the attachment structure of the door body, especially the structure for maintaining the closed state tends to be simplified, and the heating chamber The tip of the door arm protruding from the side is hooked on the side surface of the door body, and the base end of the door arm is biased in the closing direction by a biasing means such as a coil spring in the exterior housing of the heating chamber. A mounting structure has been widely adopted in which the door body is kept in a closed state by a force.

[0005]

In the microwave leakage prevention structure described above, the width and the interval of the notches formed on the peripheral wall of the choke groove are appropriate values for the wavelength of the target microwave. Exists, and a predetermined effect can be obtained by satisfying this appropriate value. On the other hand,
The door body also tends to be downsized in order to meet the demand for downsizing of the entire high frequency heating device. Therefore, the peripheral wall of the choke groove is close to or integrated with the side wall of the door body. Often provided.

Therefore, in the high-frequency heating apparatus having such a door body, when the above-mentioned mounting structure is also used, the door arm protruding from the heating chamber side is hung on the door body near the peripheral wall of the choke groove. As a result, the notch formed in the choke groove overlaps with the door arm, and due to this overlap, the appropriate value described above cannot be satisfied, and the amount of microwave leakage may increase.

The present invention has been made in view of such circumstances, and eliminates the overlap between the notch portion formed on the peripheral wall of the choke groove and the door arm, and simplifies without impairing the microwave leakage prevention effect. It is an object of the present invention to provide a high-frequency heating device that realizes the closed structure of the door body.

[0008]

In a high-frequency heating apparatus according to the present invention, a door body that opens and closes the front surface of a heating chamber that contains an object to be heated passes around the outside of a sealing surface that is in close contact with the front wall of the heating chamber. Around the choke groove, a plurality of notches having a predetermined width are arranged side by side on the peripheral wall of the choke groove at regular intervals to attenuate the microwave leaking through the sealing surface, while A high-frequency heating device configured to hook a tip of a door arm protruding from the heating chamber side to a hooking member fixed to a side portion and hold the door plate in a closed state by urging the door arm, A direction in which a fixed position of the latch member is set to a substantially central position of adjacent notches in the peripheral wall of the choke groove, and the door arm with respect to the latch member is substantially orthogonal to the door body in the closed state. It is characterized by being locked from.

In addition, the hooking member penetrates the peripheral wall to enter the inside of the choke groove, and the penetration length is set to 2/3 or more of the width dimension of the choke groove. It is characterized by being.

[0010]

According to the present invention, the side wall of the door body is hooked at a substantially center between the notches formed in the peripheral wall of the inner choke groove, that is, at a position where the peripheral wall is surely present. A stopper member is fixed, and a door arm protruding from a direction substantially orthogonal to the door in the closed state is hooked on the latch member to prevent the door arm and the notch from overlapping.

Further, the hooking member is extended into the choke groove so as to occupy a portion of 2/3 or more in the width direction, the propagation path of the microwave in the choke groove is blocked, and the microwave is dispersed. , Increase the leakage prevention effect.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a side sectional view showing a main part of a high-frequency heating device according to the present invention. Reference numeral 1 in the figure denotes an exterior housing having a heating chamber 2 (see FIG. 2) therein, and a door body 3 is attached to the front side (left side in the figure) of the exterior housing 1 so as to be openable and closable.

A support member is provided on the bottom plate 1a of the exterior housing 1.
10 is fixed, and a hinge plate 11 is screwed and fixed to the lower portion of the support 10. The hinge plate 11 is provided with a support rod 12 that penetrates the front plate 1b of the exterior housing 1 and projects downward and forward, and the door body 3 has a connecting fitting 30 fixed to the lower corner edge thereof.
Hinge pin that is set on the protruding end of the support rod 12 through
It is pivotally supported by 13.

The hinge pin 13 is struck in a direction parallel to the front plate 1b of the exterior housing 1 in a substantially horizontal plane, and the door body 3 swings about the hinge pin 13 as a pivot. Thus, the front part of the outer housing 1, that is, the front part of the heating chamber 2 is opened and closed, and the closed position shown in the drawing in which one surface is pressed against the front plate 1b of the outer housing 1 and the two-dot chain line in the figure,
The closed position and the open position having an angle of about 90 ° are respectively held.

The connecting fitting 30 is extended upward along the side edge of the door body 3, and a bracket 31 is provided at this extension portion so as to project toward the exterior housing 1 side.
Similar to the hinge pin 13, the locking pin 4 is provided in the direction parallel to the front plate 1b of the exterior housing 1 in the substantially horizontal plane.
Has been fixed.

On the other hand, a guide roller 14 is rotatably supported on the upper portion of the support 10 fixedly mounted on the bottom plate 1a of the outer housing 1 so as to be rotatable about an axis parallel to the front plate 1b.
A midway portion of the door arm 5 is mounted on 14 pivots. The door arm 5 is a strip-shaped plate material having an appropriate width, and the base end portion extending inside the exterior housing 1 has a bottom plate 1a.
It is urged downward by a tension spring 51 stretched between and.

Further, the front end portion of the door arm 5 is projected forward through a through hole formed in the front plate 1b of the exterior housing 1, and the hook groove 50 formed at the upper edge of the protruding end portion causes the above-mentioned hook. It is hooked from the lower side to the stop pin 4, and this hooked state is maintained by the swinging of the door arm 5 which is caused by the spring force of the tension spring 51 with the mounting position on the guide roller 14 as a fulcrum. Yes.

At the lower edge of the door arm 5, recesses 5a and 5b are formed in the middle of the longitudinal direction and in the vicinity of the base end, respectively, and the closed position of the door body 3 as shown in the drawing is a middle recess. 5a engages with the guide roller 14 and is held by being pressed against the guide roller 14 by the spring force of the tension spring 51 that urges the base end downward.

When the door body 3 is grasped by a handle (not shown) provided on the upper front surface of the door body 3 and pulled forward, the door body 3 swings around the hinge pin 13 at the lower corner so that the exterior housing 1 and the inside thereof. The front of the heating chamber 2 is opened. At this time, the door arm 5 is pulled forward by sliding the lower edge by the rolling of the guide roller 14, and the open position of the door body 3 shown by the chain double-dashed line in the figure indicates that the recess 5b on the base end side is It is held by being engaged with the guide roller 14 and being pressed against the guide roller 14 by the spring force of the tension spring 51.

FIG. 2 is a transverse sectional view taken along the line II-II of FIG. 1, showing a closed state of the door body 3. As shown in the figure, the heating chamber 2 is formed on the front surface of the exterior housing 1 with an opening for introducing an object to be heated. The door body 3 includes a sealing surface 32 that is in close contact with the front wall of the heating chamber 2, that is, the front plate 1b of the exterior housing 1 that surrounds the peripheral edge of the opening, and rises forward outside the sealing surface 32. A side plate 33 and a bottom plate 34, which is continuously provided on the tip of the side plate 33 so as to project outward, are provided over the entire circumference.

On the surface of the bottom plate 34 facing the front plate 1b of the exterior housing 1, a metallic periodic structure 6 made of a U-shaped channel material is fixed so that its groove portion faces the side plate 33 side. The periodic structure 6 and the side plate 33 and the bottom plate 34 form the choke groove 7 in a manner to go around the outside of the sealing surface 32.

The choke groove 7 catches the microwave leaking from the heating chamber 2 through the gap between the sealing surface 32 and the front plate 1b.
The inside is propagated and attenuated to prevent leakage to the outside. As shown in FIG. 1, the periodic structure 6 serving as the peripheral wall of the choke groove 7 is formed with notches 6a, 6a ... Having a predetermined width at regular intervals over the entire circumference. The cutouts 6a, 6a ... Work as a capacitor and enhance the microwave leakage prevention effect in the choke groove 7.

As shown in FIG. 1, the characteristic feature of the high-frequency heating apparatus according to the present invention is that the fixing structure of the latching pin 4 for latching the tip of the door arm 5 is located inside the periodic structure 6 as described above. The door arm 5 is positioned between the notch portions 6a, 6a which are adjacent to each other, and the locking of the door arm 5 with respect to the locking pin 4 is performed in a direction substantially orthogonal to the door body 3 in the closed position. .

FIG. 3 is a perspective view showing the positional relationship between the periodic structure 6 and the retaining pins 4 and the door arms 5. As shown in the figure, a bracket for fixing the latch pin 4 on the connecting fitting 30.
The protruding position of 31 is set in the middle of the notch portion 6a and the notch portion 6a which are adjacent to each other with respect to the periodic structure 6 inside thereof, and the hooking pin 4 is provided at substantially the center of the bracket 31. The door arm 5 is screwed and fixed to the threaded hole 31a penetrating therethrough. As shown by the chain double-dashed line in the figure, the door arm 5 is in a direction substantially orthogonal to the door body 3 in the closed position, that is, , The notch
6a, 6a ... are hooked in a direction substantially orthogonal to the direction in which they are arranged side by side.

By realizing such a hooked state, the door arm 5 is arranged between the notch portions 6a, 6a adjacent to each other as shown in FIG. 1 so as not to overlap either of the notch portions 6a, 6a. be able to. The width W of the notch portions 6a, 6a ... And the parallel spacing L are set according to the wavelength of the microwave in order to obtain an appropriate capacitance as a capacitor for confining the microwave in the choke groove 7. If the width W and the juxtaposed distance L are changed, the effect of preventing leakage of microwaves by the choke groove 7 is impaired.

FIG. 4 is an enlarged side sectional view of an essential part showing a hooked state of the door arm 5 which is not in accordance with the present invention, and FIG.
When the fixing position of the latch pin 4 is aligned with the approximate center of the cutout portion 6a, FIG. 4B shows the cutout portion 6a.
In each case, the position is aligned with one edge. As shown in these figures, in these cases, the door arm 5 hooked by the hooking pin 4 overlaps the whole or a part of the cutout portion 6a, and in the former case, the cutout portion 6a is completely covered by the door arm 5. Since the portion 6a does not act effectively, the juxtaposed distance L ₁ at this position largely deviates from the proper value, and in the latter case, the effective width W ₁ of the notch portion 6a partially overlapping the door arm 5 and
The parallel spacings L ₂ and L ₃ between the notch portion 6a and the notch portions 6a and 6a on both sides deviate from their respective appropriate values, and in any case, the effect of preventing microwave leakage is reduced and local As a result, the amount of leaks increases.

On the other hand, the fixing position of the latching pin 4 is set to the intermediate position of the notches 6a, 6a, and the latching of the door arm 5 with respect to the latching pin 4 is made by the notches 6a, 6a. In the high-frequency heating apparatus according to the present invention, which is performed in the direction orthogonal to the arranging direction, it is possible to dispose the door arm 5 that does not overlap any of the cutouts 6a, 6a, ... As shown in FIG. The proper width W of 6a and the proper parallel spacing L are maintained, and the effect of preventing microwave leakage in the choke groove 7 is not impaired.

Further, as shown in FIGS. 2 and 3, the periodic structure 6 is formed with a through hole 6b at a position aligned with the screw hole 31a for fixing the hooking pin 4, and the hooking pin 4 is formed. The tip is inserted into the through hole 6b and penetrates into the choke groove 7, and the penetration length is the width A of the choke groove 7, that is, the side plate 33 of the door body 3 and the periodic structure 6. It is set to 2/3 or more of the width between the facing surfaces.

The tip portion of the retaining pin 4 thus intruded serves to block the propagation path of the microwave in the choke groove 7 and disperse the microwave. It is possible to suppress the amount of leakage in a place where the leakage prevention effect is low.

The formation of the through hole 6b may change the capacitance of the capacitor, but the through hole 6b
The diameter is about a few mm to a dozen mm, and the degree of capacity change does not matter. However, when the latching pin 4 is at the position shown in FIG. 4B, the through hole 6b for inserting the latching pin 4 is formed so as to communicate with the notch 6a, resulting in the capacitor The degree of change in
The arrangement shown in FIG. 4B is not desirable from this point as well.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention. In FIG. 5A, the bottom plate 34 of the door body 3 is further extended outward, and the extension portion 35 is attached to the exterior housing 1.
Bend to the front plate 1b side of the
And the choke groove 7 surrounded by the bottom plate 34 and the side plate 33 is configured. With this configuration, the periodic structure 6 can be omitted.

Further, in FIG. 5B, the bottom plate of the door body 3
A part of 34 is extended outward, this extension part 36 is bent to the front plate 1b side of the exterior housing 1, and a bracket for screwing the hooking pin 4 is configured.
Can be omitted.

[0033]

As described above in detail, in the high-frequency heating apparatus according to the present invention, the latching member for latching the door arm is formed on the side wall of the door body on the inner wall of the choke groove. Since the door arm is arranged substantially in the center between the cutout portions and the door arm is hooked to the hooking member in a direction substantially orthogonal to the door body in the closed state, the cutout portion is formed. It is possible to arrange a door arm that does not overlap with the door arm, and a simple closing structure that keeps the door body closed by this door arm can be realized without impairing the microwave leakage prevention effect due to the action of the choke groove.

Further, since the hooking member is inserted into the choke groove and the length of the penetration is set to be ⅔ or more of the width of the choke groove, the leak wave propagating in the choke groove is dispersed and leaked. The present invention has excellent effects such that the prevention effect can be increased.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a main part of a high-frequency heating device according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 showing a closed state of the door body.

FIG. 3 is a perspective view showing a positional relationship among a periodic structure, a retaining pin, and a door arm in the high-frequency heating device according to the present invention.

FIG. 4 is a side sectional view showing an arrangement example of a latch pin and a door arm that do not follow the present invention.

FIG. 5 is an enlarged transverse cross-sectional view of a main part showing another embodiment of the high-frequency heating device according to the present invention.

[Explanation of symbols]

 1 Exterior Housing 2 Heating Chamber 3 Door 4 Locking Pin 5 Door Arm 6 Periodic Structure 6a Notch 6b Through Hole 7 Choke Groove 30 Bracket 31 Bracket 31a Screw Hole 32 Sealing Surface 50 Locking Groove

Claims (2)

[Claims] 1. A door body for opening and closing a front surface of a heating chamber for containing an object to be heated is provided with a choke groove surrounding the outside of a sealing surface which is in close contact with a front wall of the heating chamber, and a peripheral wall of the choke groove. A plurality of notches having a predetermined width are arranged side by side at a constant interval to attenuate microwaves leaking through the sealing surface, while the heating chamber is provided in a latching member fixed to a side portion of the door body. In a high-frequency heating device having a structure in which a tip of a door arm protruding from the side is locked and the door plate is held in a closed state by urging the door arm, a fixing position of the locking member is set to a peripheral wall of the choke groove. High-frequency heating, characterized in that the door arms are set at substantially central positions of adjacent notches in, and the door arm is hooked to the hooking member in a direction substantially orthogonal to the door body in the closed state. apparatus. 2. The hooking member penetrates the peripheral wall to enter the inside of the choke groove, and the penetration length is set to 2/3 or more of the width dimension of the choke groove. The high frequency heating device according to claim 1.