JPS6030078B2 - High frequency heating device - Google Patents

Description

[Detailed description of the invention] This invention relates to a high frequency heating device.

Conventionally, in this type of field, it has been practically impossible to provide a heater that can move vertically in parallel, for example, inside the heating chamber.

The reason for this is that the heater must pass through the wall of the heating chamber and lead out to the outside, but in this case, there is a risk that the heater becomes a penetrating body and high frequency waves leak outside from the lead-out part. This is because until now no means have been provided to effectively and reliably prevent the danger. In view of this, the present invention provides a means for reliably preventing leakage of high frequency waves, and aims to eliminate the numerous problems that conventional high frequency heating devices have. The present invention will be described below with reference to an illustrated embodiment. In FIGS. 1 and 2, a heater is used as an example of the penetrating body K in this embodiment.

That is, 1 is the main body of the heating device, 2 is a metal outer case forming the outer shell of this main body, 3 is a heating box with a heating chamber 4 inside, 5 is a metal front plate attached to the front of this heating box, and 6 8 is a door that opens and closes the front opening □ 7 of the heating chamber 4; 8 is an operation panel provided on a timer (not shown) that controls the heating time and a knob 9 that moves the heater 5, which will be described later, in the vertical direction; 1;
0' is a metal turntable provided in the lower part of the heating chamber 4, and is removably mounted on the upper surface of the drive board 11 to which the rotational force of an external motor (not shown) is transmitted, and the rotational force is transmitted. It looks like this. Reference numeral 12 denotes a protruding support part integrally formed corresponding to both side wall surfaces of the heating chamber 4, and 13 a metal rectangular plate that is layered as needed on this support part.
Reference numeral 14 denotes two vertically long through holes formed on the back surface of the heating chamber 4, and the width dimension of these through holes is set to be slightly larger than the diameter of the heater 5, which will be described later, and the vertical length is A.
is set, for example, to 3/4 times the fundamental wavelength of the high frequency used.

Reference numerals 15 and 16 indicate rod-shaped heaters such as sheathed heaters. Both ends of the upper heater 5 protrude outside the heating chamber 4 through the through hole 14, and the lower heater 6 similarly extends from the heating chamber 4. It penetrates the wall surface and both ends are led out.

17 is a small hole formed in the upper side of the heating chamber 4; 18 is an exhaust duct whose one end is connected to the outside of this small hole, and whose other end is open and passes through the outer case 2 to the outside thereof; Inside this, the heaters 15 and 1 detect the temperature of the hot air discharged.
A temperature detecting section P of a variable operating temperature type temperature regulator (not shown) is provided to control the energization of the heating chamber 6 and maintain the inside of the heating chamber 4 at a desired set temperature.

19 is a metal partition plate attached to the outer surface of the through hole 14 corresponding to the entire length of the hole edge; 20 is a metal shielding plate similarly attached to the back of the heating chamber 4 so as to cover the through hole 14;
Between the partition plate 19 and the through hole 14, the diameter B is approximately 1
/2 skin length, and the depth C is approximately 1/umbrella skin length, forming a choke chamber 22 (first radio wave leakage prevention chamber) having an entrance 21.

Reference numeral 23 denotes an elongated hole provided at the center of the back surface of the shielding plate 20, and the length D of this elongated cutout is 3/4 of the high frequency used, similar to the through hole 14.
The dimensions are set close to the wavelength.

Reference numeral 24 denotes a metal mounting plate (moving body) that is supported movably in the vertical direction by rollers 25 made of heat-resistant resin that are attached to green portions on both sides, one on the top and one on the top, and a metal mounting plate (movable body) that is mounted between the back surface of the shielding plate 20 and They face each other with a gap S.

However, the mounting plate of the lever is dimensioned to always close the elongated hole 23 even if it moves up and down. 26 is a roller holder, 27 is a radio wave absorber located on both sides of the gap S, extending in the shape of a lotus of the gap S on the back side of the shielding plate 20 and in a direction perpendicular thereto, and forming a passage 28, for example. It is made of ferrite-containing plastic or the like, and is fixed to the mounting plate 24 by a metal plate 29 provided on the back side.

A through hole 31 has the same width as the elongated hole 23, and 31 is a circular metal case attached to the mounting plate 24 corresponding to this through hole, with a diameter E of about 1/2 wavelength and a depth F of Approximately 1/
It has a length of 4 skins and has a fitting hole 32 for the terminal portion of the heater 15 in the center.

Therefore, a choke chamber 34 (second radio wave leakage prevention chamber) having an entrance 33 is formed between the mounting plate 24 and the case 31. 35 and 36 are metal guide plates assisted by the rollers 25, and one guide plate 35 is directly attached to the outer case 2.

37 is a terminal box into which the terminal part of the heater 16 is inserted; 38 is a metal terminal box attached to the case 31; inside is a metal terminal box into which the terminal 39 of the heater 5 is detachably inserted and the power supply is connected; A terminal chamber is formed that accommodates a power supply plate 40 and a pair of magnetic fillers 41 that sandwich the power supply plate from above and below.

42 is a power supply connection line, 43 is a high frequency inlet provided at the center of the ceiling surface of the heating chamber 4, and 44 is a waveguide, which contains a magnetron oscillation part (not shown).

45 is a cover that seals the inlet 43, and 46 is a reflector plate made entirely of press-molded stainless steel plate, the entire surface of which is coated with a black coating by enamel or painting.

As shown by the imaginary line in FIG. 2, 47 is a cutout-shaped supply port provided just above the heater 5, and the above-mentioned introduction port 43 is located directly above this.

The reflecting plate 46 is formed in advance so that its ceiling surface becomes higher as it goes from the supply port to the periphery. Reference numeral 48 denotes a hanging portion formed in a series over almost the entire circumference of the reflecting plate 46.

The heater 15 is moved downward from the highest position shown in FIG. It is continuous. 49 is an exhaust hole located above the mounting plate 24 and formed on the upper surface of the outer case 2;
This is an insulator in which a river heater 15 is attached to a reflecting plate 46.

Next, the operation of the following configuration will be explained. When the knob 9 of the operation panel 8 is now moved from the position shown in FIG. 2 in the direction shown by the imaginary line, the mounting plate 2
The mounting plate 24 is guided by the guide plates 35 and 36 via the rollers 25, and is vertically lowered.

When the position of the knob 9 is determined, the position of the mounting plate 24 is also held at a predetermined position, so that the object to be heated, such as food placed on the turntable 10, can be quickly and uniformly baked from the outside using high heat. If a high-frequency oscillation source (not shown) is further driven in this state, the high-frequency waves introduced from the inlet 43 will be irradiated mainly from the supply port 47 to the space below the reflector 46, so that the heated food, etc. Foods are heated and cooked from the inside at high speeds. During such high-frequency heating, high-frequency waves tend to leak to the outside from the through-holes 14, but in this embodiment, the high-frequency waves that come out of the through-holes 14 first enter the choke chamber 22 and are extinguished there. If the high frequency that is not extinguished by this leaks from the long notch 23 of the shielding plate 20, that high frequency will be transmitted to the choke chamber 3.
When the radio wave absorber 27 enters the hole 23 and disappears, or the gap S is narrowed and the radio wave absorber 27 attempts to go out through the passage 28 to the outside, the radio wave absorber 27 opens the hole 23 so as to face the direction of the leakage.
Since it is provided continuously and is sufficiently longer than the total length D, it can be absorbed by this.

Therefore, the high frequency waves that attempt to leak from the through hole 14 are reliably extinguished or absorbed, thereby preventing problems such as leakage causing malfunction of electronic components built into the main body 1 or harming the human body. is prevented. Furthermore, since a gap S or a passage 28 is formed between the shielding plate 20, the mounting plate 24, and the radio wave absorber 27, the radio wave absorber 27 may be deformed or burnt out by receiving the heat of the heating chamber 4. It is possible to maintain a stable radio wave absorption effect over a long period of time.

Furthermore, since the connection part of the heater 5 to the power source is provided outside the heating chamber 4 and outside the choke chambers 22 and 34, there is almost no influence of leakage high frequency waves on the terminal chamber. Since the terminals are covered by a terminal, the intrusion of these leaked high-frequency waves can be suppressed to nearly zero within a day. Therefore, the terminal 39 of the heater 15
Problems such as generation of sparks due to high frequency between the power supply plate 40 and the power supply plate 40, or noise entering the power supply side via the power supply connection line 42 can be prevented. Note that if the filling material 41 is provided inside the terminal chamber as in the embodiment, or if it is provided inside the choke chambers 22 and 34 (not shown), the filling material 41 in the heating chamber 4 can be placed on the terminal 39 side of the heater 15. It is difficult for high heat or steam generated during cooking to be transmitted, and corrosion of the terminal 39 portion and deterioration of insulation properties can be prevented, so a safe and reliable power supply state can be obtained for a long period of time.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, the penetrating body K is a support shaft 51 that supports a metal reflecting plate 46. As shown in FIG. Reference numeral 52 denotes a back piece formed by bending over the rear end of the reflecting plate 46, and covers the front surface of the through hole 14 at a predetermined interval over its entire length even when the support shaft 51 is positioned at the uppermost position. The dimensions are preset.

53 is a small hole formed in this back piece, and the support shaft 51 is inserted here.
The tip is braced.

Reference numeral 54 denotes a high-frequency transparent heat-resistant cover that seals the supply port 47 provided in the center of the reflector 46, and 55 a socket for connecting a power source to the terminal portion of the heater 5 attached to the lower surface of the reflector 46. It is fixed at 46.

Reference numeral 56 indicates a small hole provided in the ceiling surface of the heating chamber 4, 57 indicates a hole 4 similarly provided in the reflecting plate 46, and 58 indicates these small holes 56, 57.
An electrical connection wire that is passed through the inside of the heating chamber 4 and electrically connects the socket 55 to the automatic retractable cord reel 59 provided outside the heating chamber 4. A movable shield cover that does not transmit high frequencies around the entire circumference (Fig. (not shown).

60 is a radio wave absorber attached to the end of the support shaft 51 so as to surround it, and 27 is a radio wave absorber attached to the heating chamber 4 side surface of the mounting plate 24 so as to face the upper, lower, left and right surfaces of the shielding plate 20, respectively. It is an absorber.

Other than the above, the structure is the same as that of the first embodiment, so the same or corresponding parts are given the same reference numerals and the explanation will be omitted. With the above configuration, if the mounting plate 24 is now moved downward, the reflection plate 46 and the heater 15 will be lowered together, but at this time, the power supply connection wires 58 will be drawn out one after another from the cord reel 59. Therefore, the descending movement is not hindered in any way.

If the reflector plate 46 is set at a desired position and the heater 15 is energized, the powerful Korean radiation from the heater can quickly heat and cook food. In this case, the heat rays from the heater are reflected by the reflecting plate 46, and the drooping portion 48 is formed so that the hot air naturally rises, so that heat can be efficiently applied to the object to be heated. Further, the leakage prevention effect of high frequency waves leaking from the through hole 14 when high frequency heating is performed is the same as that of the first embodiment, so the explanation will be omitted. However, since the front surface of the through hole 14 is always covered by the adjacent back piece 52, the amount of high frequency irradiation to the through hole 14 can be attenuated in advance, and the radio wave absorber 2
Since the shield plate 7 is provided so as to surround the entire circumference of the shield plate 20, there is a more reliable effect of preventing radio wave leakage.

The back piece 52 of the reflecting plate 46 also has the effect of preventing dirt such as oil scattered from food from entering the rear surface of the heating chamber 4 or into the through hole 14. Figure 4 is the third example of this invention.
In this embodiment, the penetrating body K is a support shaft 62 of a teaching table 61 on which a rectangular plate 13 and an object to be heated are placed.

This support shaft is made of a U-shaped metal rod with both ends protruding from inside the heating chamber 4 to the outside through a through hole 14, and a plurality of horizontal bars 63 are passed over the upper surface of the rod to secure it. This makes up the battle counterfeit table 61. Although the heater 5 penetrates the rear surface of the heating chamber 4 and has a terminal portion protruding to the outside, it cannot be moved up or down. Other than the above, the configuration is the same as that of the first embodiment, so the explanation will be omitted. In this embodiment, the high frequency waves that would otherwise leak out from around the support shaft 62 through the through hole 14 are prevented from leaking as in the first embodiment, and the mounting table 61 is parallel to the vertical direction. Since it can be moved, it is possible to use the heaters 5 or 16 to produce strong heat, and also to use the heaters 5 or 16.
It is also possible to bake while subtly adjusting the amount of heat from above and below at a suitable place between the two, which greatly improves the range of use and ease of use.

In this embodiment, since a considerable amount of weight may be placed on the platform 61, it goes without saying that the diameter of the support shafts 62, their supporting method, number, etc. should be appropriately set to prevent the platform 61 from lowering. .

FIG. 5 shows a fourth embodiment of the present invention. In this embodiment, the penetrating body K detects the temperature of the object to be heated, and the heater 1
5, 16 or a high frequency oscillation source (not shown). In other words, the condition detector 64 includes a main body 65 made of a metal cylinder provided so as to pass through the through hole 14, and a side heating section 66 formed at the end of the main body.
For example, a positive temperature coefficient thermistor or the like whose specific resistance value changes depending on the temperature is housed inside this side thermostat. 67 is the choke room (first radio wave leakage prevention room)
The choke chamber 22 is an insulating material such as porcelain housed in the choke chamber 22, and the high frequency wavelength of this insulator is different from that of air.
The depth C is 1'4 of the fundamental wavelength of high frequency waves in the atmosphere.
is shorter than the length of or is set.

42 is a power supply connection line, 68 is a radio wave absorber attached to the outer surface of the shielding plate 20, and the mounting plate 24 moves up and down in contact with or in close proximity to this back surface.

Reference numeral 46 denotes a reflector plate supported by the heater 5 fixed to the rear wall surface of the heating chamber 4.

Note that the above values are configured in the same manner as in the first embodiment described above, so explanation thereof will be omitted. Since this embodiment has the above-described configuration, if food is placed on the dinner table 10 this evening and the Oroyama heating section 66 of the condition detector 64 is inserted into the food, for example high frequency heating is performed in this state, the temperature of the food is When the temperature rises to a preset temperature, high-frequency oscillation is automatically stopped based on a signal from the condition detector 64. Therefore, depending on the food, the temperature at the time of cooking is sent to the condition detector 64 in advance. If this setting is made, excessive heating can be prevented in this embodiment.

Furthermore, since the status detector 64 can be moved up and down by external operation, the heating process can proceed efficiently to the next stage without risking burns or other injuries when attempting to operate the status detector 64 during heating. It has the effect of being able to do the following. Although the state detector 64 in this embodiment detects temperature, it goes without saying that it may also detect other elements, such as humidity.

Furthermore, since leakage high frequency waves are less likely to be transmitted to the power supply side through the state detector 64, there is no problem such as confusion in control signals, and reliable control can be performed. FIG. 6 shows a fifth embodiment of the present invention. In this embodiment, the penetrating member K is a support shaft 70 of a partition member 69 that substantially divides the interior of the heating chamber 4 into two upper and lower chambers.

That is, the partition plate 69 is formed from a metal plate and has a planar shape that is slightly smaller than the planar shape of the heating chamber 4 . The metal support shaft 70 is iron-fitted into a small hole 72 in a hanging part 71 formed in the peripheral green part of the partition body 69. 73 is a heat-resistant cover that seals the supply port 74 formed in the center of the partition 69; 75 is an annular radio wave absorber attached to the approximately middle portion of the support shaft 68 so as to surround it; This is a spout formed at the lower side of the side for introducing water vapor produced outside the heating chamber 4.

Note that 55, 56, 58, and 59 are sockets, small holes,
Power connection wire and cord reel.

Furthermore, since the configuration other than the above is the same as that of the first embodiment, a description thereof will be omitted. Since this embodiment has the above-described configuration, the mounting plate 24 is now biased to set the partition body 69 at an appropriate height, and the heaters 15 and 16 are energized.
The heated air sectioned below by 9 is heated in a short time to a high temperature, allowing desired melting and cooking to be carried out.

Furthermore, if steam is introduced from the spout 76, the same machine can also perform steam cooking. Therefore, the partition body 69
The starting time for cooking with electric heat and steam can be significantly shortened depending on the setting position.

In addition, since high frequency waves can be irradiated from the supply port 74 to the space below regardless of the position of the partition body 69, the object to be heated can be quickly heated from the inside. You can heat and cook efficiently and evenly. FIG. 7 shows a sixth embodiment of the present invention, in which the penetrating body K is a heater 15, similar to the first embodiment shown in FIGS.

The structural differences between this embodiment and the first embodiment are as follows. That is, a metal guide plate 7 having an L-shaped cross section is installed on both sides of the back side of the heating chamber 4 via a heat insulating material 77.
8, 79 and a U-shaped guide plate 80 are respectively attached. Then, synthetic resin rollers 8 are mounted on the front surface of the mounting plate (moving body) 24 so that the tips of the rollers come into contact with these guide plates.
1 is installed. Reference numeral 82 denotes a radio wave absorber made of ferrite-containing synthetic resin or the like attached to the opposite surface of the guide plates 78, 79, and 80 to the shielding plate 20. Between the radio wave absorber and the shielding plate 20, there is a lotus in the passage Ranaluma Shark 8
3 is formed.

84 is a roller boulder.

The other aspects described above are almost the same as those in the first embodiment, so the explanation will be omitted. According to this embodiment, the vertical movement of the mounting plate (moving body) 24 is performed by the rollers 25, 81 on both sides.
The high frequency wave leaking from the elongated hole 23 is captured by the radio wave absorber 27 at the front stage and the radio wave absorber 82 at the rear stage, so the high frequency wave is transmitted more reliably and smoothly. A leakage effect can be expected.

As mentioned above, although several embodiments of the present invention have been described based on the drawings, the present invention is not limited to the configurations of these embodiments.

For example, in the first embodiment shown in FIGS. 1 and 2 and the sixth embodiment shown in FIG. 7, the heater 5 itself passes through the through hole 14, but the power supply connection line 42 Even if it penetrates through the 14th section, the same effect of preventing power leakage can be expected. This also applies to the power supply connection line 42 of the fourth embodiment shown in FIG. Also, the length A of the through hole 14
Alternatively, as a result of experiments, it was found that when the length D of the long cutout 23 was set to an odd number such as 3 times, 5 times, or 7 times the length of 1'4 of the high frequency board used, the leakage of the high frequency was the least. It seems best to set it around this area.

Furthermore, it goes without saying that the means for moving the heater 15, the reflecting plate 46, etc. may be manual or a driving source such as a motor, and the mounting plate (moving body) 24, the shielding plate 20, or the radio wave absorber 27 may be used. When the shield plate 20 and the shield plate 20 are in sliding contact, at least one of the contact surfaces between the two may be coated with a material that has a low coefficient of friction and is difficult to conduct heat, such as tetrafluoroethylene. .

As described above, the present invention provides a penetrating body in the heating chamber so as to pass through the through hole provided in the wall surface of the heating chamber, and also enables the penetrating body to move in the direction of the through hole. A radio wave leakage prevention chamber is provided to introduce high frequency waves leaked from the surrounding area of the penetrating body, and the structure is configured so that high frequency waves do not leak from the surrounding area regardless of the movement of the penetrating body. The advantages of the present invention are significant, such as a method of use, a power supply method, and a heating method, which enable efficient heating and cooking, effective control, and labor-saving heating and cooking.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway side view of a high-frequency heating device showing an embodiment of the present invention, FIG. 2 is a partially cutaway plan view thereof, and FIGS. Partially cutaway side view of a high-frequency heating device showing another embodiment of the invention, No. 7
The figure is a partially cutaway plan view of a high frequency heating device showing still another embodiment of the present invention.

In the figure, 1 is the main body, 4 is a heating chamber, 14 is a through hole, 15 is a heater (through body), 20 is a shielding plate, 22 is a choke chamber (first power leakage prevention chamber), 24 is a mounting plate (movable body), 27
is a radio wave absorber, 34 is a choke chamber (second radio wave leakage prevention chamber), 42 is a power supply connection line, 46 is a reflector, 51 is a support shaft (through body), 58 is a power supply connection line, 60' is a radio wave absorption body,
61 is a Hagi bed, 62 is a support shaft (penetrating body), 64 is a state detector, 68 is a radio wave absorber, 69 is a partition body, 70 is a support shaft (penetrating body), 75 is a radio wave absorber, K is a penetrating body It is the body. In the figures, the same reference numerals indicate the same or equivalent parts. Figure 1 Figure 7 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A through hole is provided in the wall surface of the heating chamber to which high frequency waves are supplied, and a penetrating body is provided inside the heating chamber so as to pass through the through hole, and a through hole is provided outside the heating chamber corresponding to the through hole. A radio wave leakage prevention chamber such as a chi-yoke structure is provided, the penetration body is configured to pass through this leakage prevention chamber, and the penetration body is configured to be movable in the radial direction of the through hole, and high frequency waves are transmitted from the radio wave leakage prevention chamber. A moving body for preventing leakage of high frequency waves is provided in a leakage direction corresponding to the penetrating body, and the penetrating body is configured to move in the radial direction of the through hole as the moving body moves. heating device. 2. The high-frequency heating device according to claim 1, wherein the penetrating body is a heater built into the heating chamber or a power supply connection line to the heater. 3. The high-frequency heating device according to claim 1, wherein the penetrating body is an element for detecting conditions such as temperature or humidity of the heated object or a power supply connection line thereof. 4. The high frequency heating device according to claim 1, wherein the penetrating body is a support shaft of a reflector provided in the heating chamber. 5. The high-frequency heating device according to claim 1, wherein the penetrating body is a support shaft of a table for placing a heated object provided in the heating chamber. 6. The high-frequency heating device according to claim 1, wherein the penetrating body is a support shaft of a partition that partitions the inside of the heating chamber into two or more chambers. 7. The high frequency heating device according to claim 1, wherein the length of the through hole is set to be approximately an odd multiple of 1/4 of the fundamental wavelength of the high frequency used. 8. The high-frequency heating device according to claim 1, characterized in that a space or a heat insulating layer made of a heat insulating material or the like is provided between the radio wave leakage prevention chamber and the moving body. 9. A through hole is provided in the wall surface of the heating chamber where high frequency waves are supplied, and a penetrating body is provided in the heating chamber so as to pass through the through hole, and radio wave leakage from the heating chamber, etc. to the outside of the heating chamber corresponding to the through hole is A blocking chamber is provided, and the penetrating body is configured to pass through the leakage blocking chamber, and the penetrating body is configured to be movable in the radial direction of the through hole. A movable body that prevents high frequency leakage is provided corresponding to the body, and the penetrating body is configured to move in the radial direction of the through hole as the movable body moves, and the movable body further includes the penetrating body. A high-frequency heating device comprising at least one of a radio wave absorber and a radio wave leakage prevention chamber having a chi-yoke structure located around the. 10. The high frequency heating device according to claim 9, wherein the penetrating body is a heater built into the heating chamber or a power supply connection line for the heater. 11. The high-frequency heating device according to claim 9, wherein the penetrating body is an element for detecting conditions such as temperature or humidity of the heated object or a power supply connection line thereof. 12. The high-frequency heating device according to claim 9, wherein the penetrating body is a support shaft of a reflection plate provided in the heating chamber. 13. The high-frequency heating device according to claim 9, wherein the penetrating body is a support shaft of a table for placing a heated object provided in the heating chamber. 14. The high-frequency heating device according to claim 9, wherein the penetrating body is a support shaft of a partition that partitions the inside of the heating chamber into two or more chambers. 15. The high-frequency heating device according to claim 9, wherein the length of the through hole is set to be approximately an odd multiple of 1/4 of the fundamental wavelength of the high frequency used.