JPS6037600B2 - High frequency heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a high-frequency heating device, and provides a novel high-frequency heating device having a movable electric heater within a heating chamber.

The present invention will be explained below with reference to illustrated embodiments.
In FIG. 5, 1 is an outer case constituting the outer shell of the device, 2 is a door that covers the opening □ of the metal heating chamber 9 inside the outer case 1, and 3 is provided on this door. 4 is a control panel equipped with a timer 5 for setting the heating cooking time and an operation knob 53 for vertically moving the upper heater 15 (described later); 6 is a knob for operating the timer; 7 is the heating chamber 9 and an outer case 1, a bottom plate 10 with legs 8 attached to the bottom surface, a turntable 11 on which food to be cooked is placed, and which is driven by a motor 2 attached to the bottom surface of the bottom plate 7.
is a drive shaft fixed to the bottom of the turntable, and is removable from the motor. 13 is a length 1, approximately 3/4^ (^ is the high frequency wavelength) for leading the upper heater 15 and lower heater 16 made of sheathed heaters that move up and down to the outside of the heating chamber 9.
A heating chamber rear plate provided with a long hole A 14 and a through hole 58; 17 is a partition plate made of metal provided along the long hole A 14;
18 is a metal shielding plate A bonded to the rear plate 13 of the heating chamber so as to cover the hole A 14, and has a width W of approximately ^/2 and a depth D of approximately ^/4 with the elongated hole A 14 as the center. This and the partition plate 17 form a choke chamber A 20 having an inlet a.

19 is the shielding plate A 18 has a length of about 3/4 of the hole B from which the upper heater 15 is led out, 21 is the bending wall A that covers the choke chamber A 20 and the upper heater 15. A metal shielding plate B provided with a through hole 22 is held in a position close to the shielding plate A 18, and is set to a size that blocks the previous long cutout BI9 even if it is moved up and down.

25 is a radio wave absorber made of heat-resistant ferrite plastic or the like using polyester as a binding material, which is fixed by the fixing piece 24 of the bending wall A 23; 26 is a support metal fitting having a through hole 27 similar to that of the shielding plate B 21; , a socket 28 to be described later
and shielding plate B21 are fixed by spot welding or the like.

28 is a metal socket, with a diameter W2 of about 1/2 and a depth D2 of about 1/4, with an insertion part 29 for the terminal of the upper heater 15 in the center, and a choke with an inlet 0 with the support fitting A 26. It constitutes room B31.

30' is a stop ring fixed to the lead-out portion of the upper heater 5 by welding or the like, and is brought into contact with the insertion portion 29 of the socket 28.

32 is a stopper made of spring steel or the like that prevents the upper heater 15 from coming off.

33 is a roller A made of plastic having a low coefficient of friction, such as tetrafluoroethylene, which is bent at both ends of the support fitting 26 and is rotatably attached to a shaft A34; Rollers B and 38 are fixed plates fixed to the rear plate 13 of the heating chamber, and rollers B and 38 are rotatably attached to a supporting metal fitting B 37 fixed to a shaft B 36, so that the gap with the shielding plate B 21 is made as small as possible. A bent portion is provided, and a radio wave absorber B 39 made of heat-resistant ferrite plastic or the like is fixed so as to face the shielding plate B 21 .

A stop pin 42 has an interlocking fitting A 41 movably connected to the center of the support A 26, and a rotation fulcrum is provided at the upper end of the heating chamber 9 by a pin A 44, and one end is attached to the interlocking fitting A. 41, the other end to connecting fitting C 45,
V-shaped interlocking metal fitting B, 4 held by connecting pin A 43
6 is an interlocking plate A rotatably attached to the upper surface of the heating chamber by means of a fulcrum pin B 481, one end of which is connected to the interlocking fitting C 45, and the end connected to the movement fitting ○ 49 with a connecting pin B 47. has been done.

Reference numeral 50 denotes a movement fitting E rotatably fixed to the upper part of the heating chamber 9 by a support pin C 52, one end of which is connected to the movement fitting D.
49 by a connecting pin C 51, and the end of the pond is made to protrude from the front side of the operation plate 4, and the tip of it is connected to the operation plate 5.
3 is fixed.

54 is a waveguide for feeding high frequency waves from the magnetron 56 provided in the upper part of the heating chamber 9; 55 is a cover made of a low electrolytic substance such as silicone resin provided at the closing portion of the waveguide; 57;
58 is a heat-resistant electrical insulating pipe made of polytetrafluoroethylene or the like coated on the end of the lower heater 16, and 58 is passed through a through hole 59 provided below the heating chamber rear plate 13, and has a depth of approximately D3^.
61 is a metal shield pipe to which a metal support cup 60 consisting of a metal support cup 60 is firmly fixed.
63 is a metal shielding plate C equipped with a partition pipe 62 through which the lower heater 6 passes, 64 is a choke chamber C composed of the support cup 60 and the shielding plate C63, 65 is a lower heater a fixing cup for fixing the insulator 67 of the receiving fitting 68 into which the conductive part of the terminal No. 16 is inserted;
72 is a rubber packing A having a small through hole B 73 in the center for the conductive part of the lower heater 6 to pass through, and 74 is a rubber packing B having a small cross notch 75 in the same way.

The packing A 72 and the packing B 75 are insulators 6.
7 and a shielding plate C 63, and is fixed to the flange 61 of the support cup 60 with a screw 76 via a fixing cup 65.

In addition, the arrangement order of these packings is such that packing B7 with cross notches 75 is arranged to prevent steam etc. from entering from the heating chamber 9.
4 is on the heating chamber side. As a result, when the lower heater 16 is removed, the cross notch 75 closes with its own return force.
When the lower heater 6 is inserted, it comes into close contact with the through hole B 73 of the packing A 72 to prevent steam from entering. Reference numeral 77 denotes an insulating pipe B made of heat-resistant plastic inserted into the partition pipe of the shielding plate C 63, the tip of which is iron-coupled to the caulked portion of the shield pipe 58 described above.

70 and 71 are lead wires connected to the upper heater 15 and the lower heater 6, respectively.

As described above, the high frequency heating device which is an embodiment of the present invention is
Since the heating chamber 9 is equipped with a movable heater 5 for electric cooking, in addition to high-frequency cooking, by bringing the upper heater 5 close to the cooked food, it is possible to brown the food or to properly prepare grilled food. It is something that can be done.

That is, when the control panel 53 of the operation panel 4 is moved in the direction of the arrow X in FIG. 10 The food that was taught above is further away from the outside,
The food can be baked evenly, and the inside of the food can be heated using high-frequency waves, allowing for efficient cooking.

The high frequency waves emitted from the elongated hole A 14 through which the upper heater 15 moves are sealed by the choke chamber A 201, and the high frequency waves leaked from the outermost hole B 19 are sealed by the choke chamber B 3.
1 and absorbed by the radio wave absorbers 25 and 39, it can be reliably extinguished.
In the evening, the long notch A provided on the rear plate 13 of the heating chamber
14 and shielding plate A 18 long hole B I9 length 1, that is, the moving distance of movable heater 15 is 3' according to the experiment.
The results showed that high-frequency sealing performance was good when using 4-input, 5'4-input, and 7'4-input. ZIn addition, as other embodiments of the present invention, as shown in FIGS. 8 and 9,
A choke chamber A 20 is provided around the elongated hole A 14, and a shielding plate B21 to which a movable heater 15 is fixed is slid so as to be in contact with the choke chamber A, or as shown in FIGS.
As shown in Fig. 13Z, the long hole A1 of the heating chamber rear plate 13
It is conceivable to fix a radio wave absorber A 25 around the shield plate A 4, and to slide a shield plate B 21 to which the upper heater 15 is fixed behind the radio wave absorber A 25. Furthermore, as other examples,
Shielding plate B 21, radio wave absorber A 25 and movable heater 1
5 could be attached and moved. Furthermore, it is also possible to add a choke chamber and a radio wave absorber near the shielding plate A 18, or to slide only the shielding plate B 21 along the heating chamber rear plate 13. Furthermore, in each of the above-mentioned embodiments, since the connection portions for the power supply of the heaters 15 and 16 are provided outside the heating chamber 9,
Problems such as high-frequency sparks occurring at the connections between the heaters 5 and 16 and the lead wires 70 and 71, and electrical connections being corroded by the steam generated during food heating are prevented as much as possible, ensuring long-term stability. This provides a stable power supply state. Note that the configuration of the present invention is not limited to the previous embodiments, and the amount of protrusion of the heater can be reduced by providing a choke chamber or a radio wave absorber inside the heating chamber.

Further, the outside of the heater may be movable either above or below the object to be heated. As described above, according to the present invention, by moving the heater provided in the heating chamber,
It is possible to obtain the firepower suitable for the cooking contents, and it can be moved smoothly. Furthermore, it is possible to prevent leakage of radio waves from the elongated hole and the heater, and it is extremely safe.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a high-frequency heating device showing an embodiment of the present invention, and FIG. 2 is a top view of the high-frequency heating device with its outer case cut away.
Fig. 3 is a longitudinal sectional view of the same, Fig. 4 is a side view with the outer case cut away, Fig. 5 is a transverse sectional view showing the power supply connection part of the heater, Fig. 6 A, A and Fig. 7 7, I 8 is a front view and a longitudinal cross-sectional view of the central part of the packing, FIG. 8 is a cross-sectional view of another embodiment of the present invention, FIG. 9 is a cross-sectional view taken along the line Q--Q in FIG. 8, and FIG. 10 is a cross-sectional view of the packing. 11 is a cross-sectional view of main parts showing still another embodiment of the present invention, FIG. 11 is a cross-sectional view taken along the line R-R in FIG.
The figure is a cross-sectional view of a main part showing still another embodiment of the present invention,
FIG. 13 is a sectional view taken along the line SS in FIG. 12. In the figure, 9 is a heating chamber, 13 is a rear plate of the heating chamber, 14 is a long hole A,
15 is an upper heater, 16 is a lower heater, 18 is a shielding plate A,
19 is a long hole B, 20 is a choke chamber OA, 21 is a shielding plate B, 25 is a radio wave absorber, and 55 is a magnetron. In the drawings, the same reference numerals indicate the same or equivalent parts. Figure 8 Figure 10 Figure 12 Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 4 Figure 7 Figure 9 Figure 11 Figure 13

Claims (1)

[Claims] 1. A long hole is provided in the wall of a heating chamber equipped with an electric heater that is irradiated with high frequency waves, and the terminal portion of the heater is led out to the outside by passing through the long hole, so that the heater can move along the long hole. A high-frequency heating device characterized in that a radio wave leakage prevention device consisting of a chiyoke chamber and a radio wave absorber is provided around the heater and the elongated hole, respectively.