CN103229593A - Microwave heater - Google Patents

Microwave heater Download PDF

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Publication number
CN103229593A
CN103229593A CN2011800571411A CN201180057141A CN103229593A CN 103229593 A CN103229593 A CN 103229593A CN 2011800571411 A CN2011800571411 A CN 2011800571411A CN 201180057141 A CN201180057141 A CN 201180057141A CN 103229593 A CN103229593 A CN 103229593A
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China
Prior art keywords
microwave
radiation portion
heating
waveguide
microwave radiation
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Granted
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CN2011800571411A
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Chinese (zh)
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CN103229593B (en
Inventor
细川大介
吉野浩二
福田祐
久保昌之
贞平匡史
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication of CN103229593A publication Critical patent/CN103229593A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/704—Feed lines using microwave polarisers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides
    • H05B6/708—Feed lines using waveguides in particular slotted waveguides
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/80—Apparatus for specific applications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/045—Microwave disinfection, sterilization, destruction of waste...

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Ovens (AREA)

Abstract

The present invention provides a microwave heater capable of microwave heating an object to be heated, with high efficiency and in a uniform manner without the use of a rotation mechanism. The microwave heater is provided with a plurality of microwave radiating units (6) on a surface facing a heating chamber (2) in a waveguide unit (5) for transmitting microwaves from a microwave generator (4); the microwave radiating units (6) radiate circularly polarized waves in the heating chamber, and each of the plurality of microwave radiating units radiates nearly the same amount of microwave radiation.

Description

Microwave heating equipment
Technical field
The present invention relates to microwave heating equipments such as microwave oven, particularly at the textural microwave heating equipment of microwave radiation portion with feature.
Background technology
As object being carried out the representative device of the microwave heating equipment of heat treated, there is microwave oven with microwave.In microwave oven, the microwave radiation that produces in the microwave generator is to metal heating chamber inside, and the microwave by radiation carries out heat treated to the heating object of heating chamber inside.
Microwave generator as in the microwave oven has in the past used magnetron.The microwave that is generated by magnetron is radiated heating chamber inside via waveguide.When the electromagnetic field skewness of the microwave of heating chamber inside, can not carry out microwave heating to heating object equably.
In the past, means as making to the homogeneous heating of heating object are generally the microwave heating equipment with following structure: make the mounting table rotation of mounting heating object and make the structure of heating object rotation, fixedly heating object and make microwave radiation the antenna rotation structure or change from the structure of the phase place of the microwave of microwave generator generation by phase shifter.
For example, in microwave heating equipment in the past, rotable antenna, antenna axis etc. are arranged in the waveguide internal configurations, by antenna motor rotable antenna rotation on one side to magnetron driven on one side, thereby inhomogeneous that the interior microwave of heating chamber distributes reduced.
In addition, as record in the Japanese kokai publication sho 62-064093 communique (patent documentation 1), the microwave heating equipment that magnetron is provided with rotable antenna has been proposed.In the microwave heating equipment of patent documentation 1, by will blowing to the blade of rotable antenna, thereby utilize the wind-force of this Air Blast fan to make the antenna rotation from the cooling air of Air Blast fan, the microwave that changes in the heating chamber distributes.
On the other hand, as example with phase shifter, the microwave heating equipment of record in No. 4301347 specification of United States Patent (USP) (patent documentation 2) is arranged, and this microwave heating equipment had both reduced the heating inequality of heating object in the microwave heating, had realized that again cost reduces and the space of power supply is saved.As like that, proposed to be provided with the microwave heating equipment of microwave radiation portion being used for the radiation circularly polarized wave and the rotating mechanism that is used to change phase place in heating chamber inside in record in the patent documentation 2.
The prior art document
[patent documentation]
Patent documentation 1: Japanese kokai publication sho 62-064093 communique
Patent documentation 2: No. 4301347 specification of United States Patent (USP)
Patent documentation 3: TOHKEMY 2007-225186 communique
Summary of the invention
Invent problem to be solved
For microwave heating equipment, require efficiently and equably to heat heating object with simple structure as the microwave oven.But, have variety of issue in the disclosed aforesaid structure in the past up to now.
In addition, in microwave heating equipment, particularly microwave oven, the technological development of high outputization constantly develops, and is selling the commodity that specified high frequency is output as 1000W in Japan.Microwave heating equipment is not the device that takes heated food by heat conduction, and microwave heating equipment is to utilize the directly convenience of heated food of induction heating as the notable feature of commodity.But in microwave oven, it is more obvious that the height outputization under the state of unresolved heating inequality can cause heating uneven problem.
As the constructional problem that microwave heating equipment had in the past, can enumerate following 2 points.First is, needs to adopt the mechanism that makes mounting table or antenna rotation in order to reduce the heating inequality.Therefore, in microwave heating equipment in the past, the space that is provided with that must guarantee to be used to make the revolution space of mounting table or antenna rotation and be used to make driving mechanisms such as mounting table or antenna motor rotating has hindered the miniaturization of microwave heating equipment.
Second is, in order to make the rotation of mounting table or antenna stabilization ground, needs this rotable antenna is arranged on the top or the bottom of heating chamber, and structure is restricted.
In microwave heating equipment, the meetings such as rotating mechanism that mounting table or phase shifter are set in the space of illuminated microwave reduce reliability.Therefore, require not needing to realize the microwave heating equipment of these mechanisms.
In addition, in order to reduce in the microwave heating heating inequality to heating object, realize that simultaneously cost reduces and the space of power supply is saved, in picture patent documentation 2 record, from single microwave radiation portion to the microwave heating equipment of heating chamber internal radiation circularly polarized wave, though have the advantage of the rotating mechanism that does not possess mounting table or antenna, but have problem as described below: this microwave heating equipment need be used to change the rotating mechanism of phase place, and relies on from the microwave radiation of single microwave radiation portion and can't carry out fully evenly heating to heating object.
The present invention finishes for the problem that solves in the above-mentioned microwave heating equipment in the past, and its purpose is, provides a kind of and need not to use the rotating mechanism can be evenly and the microwave heating equipment that efficiently heating object is carried out microwave heating.
The means that are used to deal with problems
The present invention has to achieve these goals: heating chamber, and it takes in heating object; Mounting portion, it constitutes the bottom surface of described heating chamber, takes in the mounting heating object in described heating chamber; The microwave generating unit, it produces described microwave; Waveguide portion, it sends the microwave from described microwave generating unit; And a plurality of microwave radiation portion, its be arranged on described waveguide portion with described heating chamber facing surfaces on, radiation circularly polarized wave in heating chamber.
In the microwave heating equipment of the present invention that constitutes as mentioned above, can be suppressed at become in the microwave heating in the microwave heating equipment in the past problem, the standing wave because of being radiated the microwave in the heating chamber and producing by the interference between the microwave of the reflections such as inwall of heating chamber, can realize uniform microwave heating.
The invention effect
In microwave heating equipment of the present invention, do not use rotating mechanism, can be with simple even structure and efficiently heating object is carried out microwave heating, and can realize the miniaturization of power supply, the raising of reliability.
Description of drawings
Fig. 1 is the stereogram that the microwave heating equipment of embodiments of the present invention 1 is shown.
Fig. 2 is the cutaway view of the microwave heating equipment of execution mode 1.
Fig. 3 is the vertical view that the waveguide of the microwave radiation portion in the microwave heating equipment of execution mode 1 is shown.
Fig. 4 is the figure that the concrete shape of the microwave radiation portion that uses in the microwave heating equipment of execution mode 1 is shown.
Fig. 5 is the stereogram that the microwave heating equipment of embodiments of the present invention 2 is shown.
Fig. 6 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of execution mode 2 is shown.
Fig. 7 is the stereogram that general rectangular waveguide is shown.
Fig. 8 is the stereogram that the microwave heating equipment of embodiments of the present invention 3 is shown.
Fig. 9 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of execution mode 3 is shown.
Figure 10 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of embodiments of the present invention 4 is shown.
Figure 11 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of embodiments of the present invention 5 is shown.
Figure 12 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of embodiments of the present invention 6 is shown.
Figure 13 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of embodiments of the present invention 7 is shown.
Figure 14 is the figure that the concrete structure of the microwave radiation portion in execution mode 6 and the execution mode 7 is shown.
Figure 15 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of embodiments of the present invention 8 is shown.
Figure 16 is the figure that other structures of the microwave radiation portion in the microwave heating equipment of execution mode 8 are shown.
Figure 17 is the stereogram that the microwave heating equipment of embodiments of the present invention 9 is shown.
Figure 18 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of execution mode 9 is shown.
Figure 19 is the stereogram that the microwave heating equipment of embodiments of the present invention 10 is shown.
Figure 20 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of execution mode 10 is shown.
Figure 21 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of embodiments of the present invention 11 is shown.
Figure 22 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of embodiments of the present invention 12 is shown.
Figure 23 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of embodiments of the present invention 13 is shown.
Figure 24 is the waveguide vertical view that the microwave radiation portion in the microwave heating equipment of embodiments of the present invention 14 is shown.
Figure 25 is the stereogram that the microwave heating equipment of embodiments of the present invention 15 is shown.
Figure 26 is the front section view of the microwave heating equipment of execution mode 15.
Figure 27 illustrates the section plan that the bottom surface sections of the heating chamber in the microwave heating equipment of execution mode 15 is graded.
Figure 28 is the front section view of the microwave heating equipment of embodiments of the present invention 16.
Figure 29 illustrates the section plan that the bottom surface sections of the heating chamber in the microwave heating equipment of execution mode 16 is graded.
Figure 30 is the cutaway view that microwave heating equipment in the past is shown.
Embodiment
In the 1st invention, have:
Heating chamber, it takes in heating object;
Mounting portion, it constitutes the bottom surface of described heating chamber, takes in the mounting heating object in described heating chamber;
The microwave generating unit, it produces described microwave;
Waveguide portion, it sends the microwave from described microwave generating unit; And
A plurality of microwave radiation portion, its be arranged on described waveguide portion with described heating chamber facing surfaces on, radiation circularly polarized wave in heating chamber.
In the microwave heating equipment of the 1st invention that constitutes as mentioned above, can be suppressed at become in the microwave heating of microwave heating equipment in the past problem, the standing wave because of being radiated the microwave in the heating chamber and producing by the interference between the microwave of the reflections such as inwall of heating chamber, can realize uniform microwave heating.
In the 2nd invention, described a plurality of microwave radiation portion be configured in described mounting portion under.The microwave heating equipment of the 2nd invention that constitutes like this can carry out microwave heating to heating object equably.
Constitute in the microwave heating equipment of the 3rd invention, described a plurality of microwave radiation portion is the microwave of the roughly the same amount of radiation of radiation respectively.The microwave heating equipment of the 3rd invention that constitutes like this can carry out microwave heating to heating object equably.
The 4th invention is especially in the 3rd invention, and described a plurality of microwave radiation portion is alignment arrangements on the direction of transfer in described waveguide portion at least.In the microwave heating equipment of the 4th invention that constitutes like this,, can evenly and efficiently carry out microwave heating to heating object by microwave radiation portion is configured in the desired locations place rightly.
The 5th invention is especially in the 3rd invention, and described a plurality of microwave radiation portion is alignment arrangements on the direction vertical with direction of transfer and direction of an electric field in described waveguide portion at least.The microwave heating equipment of the 5th invention that constitutes like this can evenly and efficiently carry out microwave heating to heating object.
The 6th invention is especially in the 4th or the 5th invention, and described a plurality of microwave radiation portion is the long limit that makes intersected with each other and each slit of two slits (slit) with respect to the shape of the direction of transfer inclination in the described waveguide portion.The microwave heating equipment of the 6th invention that constitutes like this can evenly and efficiently carry out microwave heating to heating object.
The 7th invention is especially in the 4th or the 5th invention, the described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion, the long edge lengths that constitutes described slit are according to the position on the direction of transfer in the described waveguide portion and difference.In the microwave heating equipment of the 7th invention that constitutes like this, the configuration by changing microwave radiation portion respectively and the slit length of microwave radiation portion can the controlled microwave amount of radiation, can evenly and efficiently carry out microwave heating to heating object.
The 8th invention is especially in the 4th or the 5th invention, the described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion, the long edge lengths that constitutes described slit according in the described waveguide portion with the vertical direction of direction of transfer and direction of an electric field on the position and different.The microwave heating equipment of the 8th invention that constitutes like this can evenly and efficiently carry out microwave heating to heating object.
The 9th invention is especially in the 4th or the 5th invention, the described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion, the width that constitutes described slit are according to the position on the direction of transfer in the described waveguide portion and difference.In the microwave heating equipment of the 9th invention that constitutes like this, the configuration of not only changing microwave radiation portion, but also the slit width of change microwave radiation portion, the microwave that can change thus in the heating chamber distributes, and can guarantee the uniformity that the microwave in the heating chamber distributes.
The 10th invention is especially in the 4th or the 5th invention, the described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion, the width that constitutes described slit according in the described waveguide portion with the vertical direction of direction of transfer and direction of an electric field on the position and different.The microwave heating equipment of the 10th invention that constitutes like this can evenly and efficiently carry out microwave heating to heating object.
The 11st invention is especially in the 4th or the 5th invention, the described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion has been implemented R chamfer machining or C chamfer machining to the cross section of described slit.In the microwave heating equipment of the 11st invention that constitutes like this, can reduce the microwave loss in the microwave radiation portion, can carry out microwave heating to heating object efficiently.
The 12nd invention is especially in the 4th or the 5th invention, the described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion has been implemented R chamfer machining or C chamfer machining to the end portion of described slit.In the microwave heating equipment of the 12nd invention that constitutes like this, can reduce the microwave loss in the microwave radiation portion, can carry out microwave heating to heating object efficiently.
The 13rd invention is especially in the 4th or the 5th invention, the described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion, position about the cross section of described slit, have following shape: from the long microwave radiation portion of the transmitting range that the position is set of described microwave generating unit with compare from the short microwave radiation portion of the transmitting range that the position is set of described microwave generating unit, from the microwave radiation rate height of described waveguide portion to described heating chamber.The microwave heating equipment of the 13rd invention that constitutes like this can evenly and efficiently carry out microwave heating to heating object.
The 14th invention is especially in the 3rd invention, the mounting portion of taking in the mounting heating object in described heating chamber has the microwave penetrating portion of the microwave penetrating of making, described microwave penetrating portion and described microwave radiation portion relatively dispose, described microwave penetrating portion be arranged on described microwave radiation portion at least directly over.In the microwave heating equipment of the 14th invention that constitutes like this, can will make the zone of microwave penetrating be configured little in the mounting portion.Its result in microwave heating equipment, can reduce the loss amount of the microwave energy that causes because of the reason that absorbs microwave in mounting portion, can improve the efficiency of heating surface of microwave to heating object, can realize excellent energy-efficient performance.
In addition, owing to be microwave to be supplied power to mode in the heating chamber with circularly polarized wave, therefore do not need rotable antenna and be used to drive the motor of rotable antenna, therefore do not need to be provided with the driving space that these mechanisms use and the space is set, the microwave heating equipment miniaturization can be made, the space can be reduced to be provided with.
The 15th invention is especially in the 14th invention, and described microwave penetrating portion has the corresponding shape with described microwave radiation portion.In the microwave heating equipment of the 15th invention that constitutes like this, the zone that sees through of microwave can be constituted necessary Min., can further reduce the microwave absorbing loss in the microwave penetrating portion.Its result, microwave heating equipment can further improve the power supplying efficiency of microwave to heating chamber.
The 16th invention is especially in the 15th invention, and described mounting portion constitutes the microwave reflection portion with described microwave penetrating portion and microwave reflection.In the microwave heating equipment of the 16th invention that constitutes like this, constitute and utilize microwave reflection portion to reflect the microwave that does not absorb by heating object, therefore promoted the microwave absorbing of heating object, can further improve the efficiency of heating surface of microwave.
The 17th invention is especially in the 16th invention, and described microwave penetrating portion is made of the glass ceramics that comprises any one material at least in silica, aluminium oxide, zirconia or the lithia.In the microwave heating equipment of the 17th invention that constitutes like this, can improve the through performance of microwave, therefore can increase the microwave energy of radiation in heating chamber, can improve the efficiency of heating surface of microwave to heating object.
The 18th invention is especially in the 16th invention, and described microwave penetrating portion is that the material of plastics constitutes by principal component.In the microwave heating equipment of the 18th invention that constitutes like this, compare with glass ceramics, can further improve the through performance of microwave, therefore can improve the efficiency of heating surface of heating object.
The 19th invention is especially in the 16th invention, and described microwave reflection portion is made of metal material.In the microwave heating equipment of the 19th invention that constitutes like this, can improve the reflection characteristic of microwave, therefore can further improve the efficiency of heating surface of microwave to heating object.
Below, describe with reference to the preferred implementation of accompanying drawing microwave heating equipment of the present invention.In addition, though in the microwave heating equipment of following execution mode microwave oven is illustrated, microwave oven is an illustration, and microwave heating equipment of the present invention is not limited to microwave oven, also comprises the microwave heating equipment that has utilized induction heating.In addition, the invention is not restricted to the concrete structure in the following execution mode, also comprise structure based on constructed thought.
(execution mode 1)
Fig. 1 is the stereogram that illustrates as the microwave oven of the microwave heating equipment of embodiments of the present invention 1.Fig. 2 uses the face parallel with the front to cut off at place, the roughly centre position of the depth direction of the microwave heating equipment of embodiments of the present invention 1 and the cutaway view that obtains, shows main component part.Fig. 3 is the vertical view as the waveguide of waveguide portion, and it shows in the microwave heating equipment of embodiments of the present invention 1 position as the microwave radiation portion of the antenna of the microwave of radiation circularly polarized wave.
As shown in Figure 1, have as the microwave oven of the microwave heating equipment 1 of execution mode 1: door 7, it has window at front surface; Heating chamber 2, it is sealed by closing door 7, takes in by the heating object of microwave heating; And mounting portion 3, it is used for taking in the mounting heating object in the inside of heating chamber 2.
Under mounting portion 3, as to the microwave radiation unit of the internal radiation microwave of heating chamber 2, be provided with a plurality of microwave radiation portion 6.Each microwave radiation portion 6 constitutes the internal radiation circularly polarized wave to heating chamber 2.
As shown in Figure 2, the microwave heating equipment 1 of execution mode 1 has: microwave generation device 4, and it is the microwave generating unit that is made of the magnetron that produces microwave etc.; And waveguide 5, it is the waveguide portion that is transmitted in the microwave that produces in the microwave generation device 4 to each microwave radiation portion 6.
As shown in Figure 3, in the microwave heating equipment 1 of execution mode 1, be formed with the microwave radiation portion 6 of a plurality of internal radiations to heating chamber 2 as the microwave of the roughly the same amount of circularly polarized wave at the upper surface of waveguide 5.Microwave radiation portion 6 is configured to evenly and efficiently the heating object in the mounting portion 3 is carried out microwave heating.
Under microwave radiation portion was single situation, because the relation of the directive property of the microwave of institute's radiation etc., the microwave that is difficult to adjust equably in the heating chamber distributed.For example, in the microwave heating equipment that is provided with the high microwave radiation portion of directive property, heated by the concentrated area near having only microwave radiation portion.Its result has produced the problem that occurs the heating inequality in heating object.
The microwave heating equipment 1 of execution mode 1 constitutes, as the waveguide 5 of waveguide portion be provided with a plurality of microwave radiation portion 6 with heating chamber 2 facing surfaces, from each microwave radiation portion 6 to the internal radiation of heating chamber 2 microwave as the roughly the same amount of circularly polarized wave.Therefore, even have at microwave under the situation of high directivity, also can realize uniform microwave heating to heating object from each microwave radiation portion 6.
The microwave heating equipment 1 of execution mode 1 constitutes, the microwave of microwave radiation portion 6 radiation circularly polarized waves.Because general microwave heating equipment in the past has the structure to the microwave of heating chamber internal radiation linearly polarized wave (plane of polarization of electric field is fixed) from microwave radiation portion, so, produce standing wave because of the microwave that is radiated heating chamber inside and by the interference between the microwave of the reflections such as inwall of heating chamber, become the reason of the heating inequality of heating object.And in the microwave heating equipment 1 of execution mode 1, the generation that becomes standing wave problem, that generate because of the microwave of radiation and by the interference between the microwave of the reflections such as inwall of heating chamber in the microwave heating of microwave heating equipment in the past can be suppressed at, uniform microwave heating can be realized.
Below, circularly polarized wave is described.Circularly polarized wave is in the widely used technology in the field of mobile communication and satellite communication.The use-case that makes as being familiar with can exemplify ETC(Electronic-Toll Collection System) " electronic charging system without parking " etc.
Circularly polarized wave is the microwave that the plane of polarization of electric field rotates in time with respect to the direct of travel of electric wave, and when forming circularly polarized wave, the direction of electric field continues to change in time.Like this, when to the microwave of heating chamber internal radiation circularly polarized wave, because being radiated the direction of electric field of the microwave of heating chamber inside continue to change, therefore no matter be any place, the size of electric field strength is all roughly even, even have the feature that the reflection of having considered heating chamber inwall etc. also is not easy to cause standing wave.
The microwave heating equipment 1 of execution mode 1 constitutes, and is provided with a plurality of microwave radiation portion 6, from the microwave of each microwave radiation portion 6 to the internal radiation circularly polarized wave of heating chamber 2.The microwave heating that realizes of the microwave of the linearly polarized wave that uses in the microwave heating equipment 1 of the execution mode 1 of Gou Chenging and in the past the general microwave heating equipment is compared as mentioned above, can be to the inside of heating chamber 2 microwave radiation equably, can be equably the heating object of heating chamber 2 inside be carried out microwave heating.
Circularly polarized wave is classified as right-handed polarized wave (CW:clockwise, clockwise) and left-hand polarized wave (CCW:counter clockwise, these two kinds counterclockwise) according to direction of rotation.The circularly polarized wave that no matter is radiated heating chamber 2 inside is any in right-handed polarized wave (CW) or the left-hand polarized wave (CCW), does not all have difference on heating properties.
Sending in the waveguide of the microwave of microwave generation devices such as magnetron, generation be that the direction of vibration in electric field and magnetic field is the microwave of the linearly polarized wave of fixed-direction.As mentioned above, in general microwave heating equipment in the past, from the microwave of waveguide to heating chamber internal radiation linearly polarized wave.Therefore, in the general microwave heating equipment in the past of radiation polarized wave in heating chamber, in order to reduce inhomogeneous that microwave in the heating chamber distributes, be provided with the mounting table rotation that makes the mounting heating object mechanism, make from waveguide to the mechanism of the antenna rotation of heating chamber microwave radiation or be used for changing in the pipe at waveguide the phase shifter of phase place.
But,, also be difficult in the uniform microwave heating of the interior realization of heating chamber of microwave heating equipment even be provided with mechanism and the phase shifter that makes mounting table or antenna rotation.And in microwave heating equipment in the past, because rotating mechanism and phase shifter need be set, so number of components increases, and complex structureization, and structure is restricted has produced the problem that the reliability of device reduces.
About complicated, the restriction of structure of aforesaid structure and the problem that reliability reduces, in the microwave heating equipment 1 of execution mode 1, has the structure that to eliminate all these problems.The microwave heating equipment 1 of execution mode 1 constitutes, a plurality of microwave radiation portion 6 is arranged on waveguide 5 with heating chamber 2 facing surfaces on, from a plurality of microwave radiation portion 6 respectively to the internal radiation of heating chamber 2 microwave as the roughly the same amount of radiation of circularly polarized wave.Therefore, the microwave heating equipment 1 of execution mode 1 becomes device as follows: its simple structure, and few to the restriction of structure, have the high structure of reliability, can evenly and efficiently carry out microwave heating to heating object.
[condition of microwave radiation quantitative changeization]
As mentioned above, in the microwave heating equipment 1 of execution mode 1, need not to be provided with the mechanism that makes the rotation of mounting table or antenna and phase shifter etc., can realize uniform microwave heating the heating object of heating chamber 2 inside.Therefore, in the microwave heating equipment 1 of execution mode 1, can avoid reliably when the fault of rotating mechanism and the unequal problem of heating of the heating object during the heating action that produces during abnormal operation.
And, when transmitting, when using waveguide 5, change according to following three conditions to the amount of the microwave of the internal radiation of heating chamber 2 from each microwave radiation portion 6 as delivery unit from microwave that microwave generation devices such as magnetron 4 produce.
First condition is with reference to Fig. 2 at direction of transfer X() last distance (position) from microwave generation devices 4 such as magnetrons to microwave radiation portion 6.The microwave amount according to the cause that the distance on the direction of transfer X (position) changes is in this wise: for the microwave that produces from microwave generation device 4, from the short position of the transmitting range of microwave generation device 4 and because the bendings of waveguide etc. make the position that direction of transfer X changes, the delivery status instability of microwave, Electric Field Distribution in the waveguide becomes mixed and disorderly state, and from the transmitting range of microwave generation device 4 position far away, in stable condition.
For example, using the waveguide that bends to the L word 5 shown in Figure 2 to transmit under the situation of microwave, from the microwave amount of microwave radiation portion 6 radiation that are configured in the bend periphery greater than with the bend periphery at a distance of the abundant microwave amount of the microwave radiation portion 6 of distance, the amount of the microwave of institute's radiation is according to the change in location on the direction of transfer X and significantly increase and decrease.
Second condition is that to go up from the terminal of waveguide 5 be the distance of end face 15 to microwave radiation portion 6 to the direction of transfer X among Fig. 2.Because the microwave that transmits in the inside of waveguide 5 is a linearly polarized wave, so, because and the interference between the reflected wave of the end face 15 of waveguide 5, standing wave produced in the inside of waveguide 5.Usually, electric field is zero on the end face of waveguide 5, so electric field strength goes up because of direction of transfer X and end face 15 distance apart changes.Therefore, the microwave amount that is radiated the inside of heating chamber 2 increases and decreases according to the distance that direction of transfer X goes up from the end face 15 of waveguide 5 to microwave radiation portion 6.
Promptly, being 1/4 position electric field strength maximum of standing wave wavelength with end face 15 distance apart of waveguide 5 on direction of transfer X, is 1/2 position electric field strength minimum of standing wave wavelength with end face 15 distance apart of waveguide 5 on direction of transfer X.
Therefore, even identical shaped microwave radiation portion 6, if end face 15 distance apart with waveguide 5 is different on direction of transfer X, then the microwave amount from each microwave radiation portion 6 radiation increases and decreases.
The 3rd condition be in the waveguide 5 with direction of transfer X and direction of an electric field Y(with reference to Fig. 2) position on the vertical direction (the Width Z of waveguide 5 :) with reference to Fig. 3.This be because, in transmitting the waveguide 5 of microwave, different with electric field strength on the vertical direction (Width Z) of direction of transfer X and direction of an electric field Y.
In general, in microwave heating equipments such as microwave oven, transmit microwave with the TE10 pattern.Therefore, in mode, exist along the symmetry axis of the Electric Field Distribution of direction of transfer X extension through the waveguide central authorities on the direction (Width Z) vertical with direction of transfer X and direction of an electric field Y.
In addition, under the situation that disposes a plurality of microwave radiation portion on the same straight line of direction of transfer X, according to interval L(reference Fig. 6 described later, the Figure 12 on direction of transfer X of adjacent microwave radiation portion), the relation that is radiated the microwave amount of heating chamber inside from each microwave radiation portion changes.
For example, the interval L in adjacent microwave radiation portion on direction of transfer X become with waveguide in during the wavelength equal lengths of the standing wave that produces, give off the microwave of same electric field intensity from adjacent microwave radiation portion.
But, when the interval L in adjacent microwave radiation portion on direction of transfer X becomes the length different with the wavelength of the standing wave that produces in the waveguide, give off the microwave that has with the corresponding electric field strength difference of difference in length from each microwave radiation portion.
On the basis of having considered above three conditions, in the structure of execution mode 1, microwave radiation portion 6 is provided in waveguide 5 with heating chamber 2 facing surfaces on, make the even microwave distribution of heating chamber inside.Therefore,, do not dispose microwave radiation portion 6 if consider above-mentioned three conditions even microwave radiation portion 6 is configured in position about central authorities' symmetry of the inner space of heating chamber 2, then mostly under the situation microwaves in the heating chamber 2 to distribute also be uneven.
Therefore, on direction of transfer X, have in the microwave heating equipment of execution mode 1 of a plurality of microwave radiation portion 6, be absolutely necessary by the technology that a plurality of microwave radiation portion 6 is provided in rightly the homogenizing that the microwave of realizing the inner space of heating chamber 2 in the desired locations place distributes.
[structure of microwave radiation portion]
In the microwave heating equipment of execution mode 1, the structure of the microwave radiation portion 6 of radiation circularly polarized wave is described.In the microwave heating equipment of execution mode 1, as the structure of microwave radiation portion 6,, be not particularly limited, but the illustration of the concrete shape of conduct describes with reference to Fig. 4 as long as have radiation circular polarization wave structure.Fig. 4 shows the concrete shape of the microwave radiation portion that uses in the microwave heating equipment of execution mode 1.Microwave radiation portion 6 shown in Figure 4 is made of plural at least slit (elongated opening portion).Microwave radiation portion 6 be formed on waveguide 5 with heating chamber 2 facing surfaces on, and be formed on the position that the center P of the waveguide 5 on the direction vertical with direction of transfer X and direction of an electric field Y (Width Z) departs from.
In Fig. 4, (a)～(f) show microwave radiation portion 6 with 6 kinds of shapes.As shown in Figure 4, each microwave radiation portion 6 is made of the slit more than 2 (elongated opening portion).So long as wherein the long limit of at least one slit gets final product with respect to the shape that the direction of transfer X of microwave tilts.
Microwave radiation portion 6 shown in Fig. 4 (a) has two slits and intersects and incorporate X word shape is can be with the shape of simple reliable in structure eradiation circularly polarized wave in central spot each other.Each slit tilts 45 degree with respect to direction of transfer X and forms.Under the situation of this shape,, can form circularly polarized wave or elliptically polarized wave if two central points that slit intersected deviate from the center P of waveguide 5 at least.
Two slits of the microwave radiation portion 6 shown in Fig. 4 (b) tilt 45 degree with respect to direction of transfer X and form, and form from the center of a slit and extend another slit and incorporate T word shape.
Two slits of the microwave radiation portion 6 shown in Fig. 4 (c) tilt 45 degree with respect to direction of transfer X and form, and form from the end of a slit and extend another slit and incorporate L word shape.
3 slits of the microwave radiation portion 6 shown in Fig. 4 (d) tilt 45 degree with respect to direction of transfer X and form, and near the mode from extending slit respectively the both ends of a slit, form.
Microwave radiation portion 6 shown in Fig. 4 (e) is formed by two slits of closely configuration, and each slit is formed obliquely with respect to direction of transfer X.And being configured to slit is perpendicular to one another.
4 slits of the microwave radiation portion 6 shown in Fig. 4 (f) are configured to radial, and each slit tilts 45 degree with respect to direction of transfer X and forms.
Shape as microwave radiation portion 6, getting final product so long as can form the shape of circularly polarized wave, as (e) of Fig. 4 with (f), can be the Uncrossed each other shape of slit, shown in Fig. 4 (d), also can be the shape that constitutes by 3 slit one perhaps.
[condition of the shape of microwave radiation portion]
In the microwave heating equipment of execution mode 1, the condition as the optimum shape of the microwave radiation portion 6 of the radiation circularly polarized wave that is made of two slits (elongated opening portion) shown in for example Fig. 4 (a) can list following 3 points.
First is that the long edge lengths of each slit is wavelength in pipe λ g about more than 1/4 in the waveguide 5.Second is that two slits are perpendicular to one another and the long limit of each slit tilts 45 ° with respect to direction of transfer X.Thirdly be with parallel with the direction of transfer X of waveguide 5 and be axle, do not become about this axisymmetric Electric Field Distribution through the straight line of the essence core of microwave radiation portion 6.
For example, when transmitting microwave with the TE10 pattern, electric field is with the central shaft (tubular axis: be that symmetry axis distributes P) along direction of transfer X extension of waveguide 5.Therefore, as the shape of the microwave radiation portion 6 of radiation circularly polarized wave, condition is to be configured to, and the central shaft (P) about the direction of transfer X in the waveguide 5 does not become axial symmetry.
In addition, as the shape of microwave radiation portion 6, also can constitute slit (elongated opening portion) and intersect obliquely in the off plumb mode.Like this, even have the microwave radiation portion 6 that makes the shape that the X word loses shape, also can the radiation circularly polarized wave, do not dwindle the opening portion of the slit of radiation circularly polarized wave, but can make center that slit intersects further near the end of the Width of waveguide 5.Its result can go up the scope that further enlarges microwave in the direction vertical with direction of transfer X and direction of an electric field Y (Width Z) of waveguide 5, need not to use driving mechanism to heat heating object more equably.
In addition, as (e) of Fig. 4 with (f), when constituting L word shape or T word shape, a plurality of slits can be disposed separated from one anotherly in that a plurality of slits are separated.In addition, at (e) of Fig. 4 with (f), the example that slit vertically is configured has been described, but, slit can not be a vertical relation, also can with 30 the degree about and tilt.
In addition, the shape of slit as microwave radiation portion 6 is not limited to rectangle.The bight of the opening portion of slit can be made of curved surface (R), also can be made of tangent plane (C).By becoming such shape, can produce circularly polarized wave, and can alleviate electric field and concentrate and realize microwave heating efficiently.
As mentioned above, as the opening shape that is used for the basic circularly polarized wave of radiation in the microwave radiation portion 6 of radiation circularly polarized wave, as long as make up the slotted hole opening of the short elongate slit shape of long, the perpendicular direction of at least two directions.
(execution mode 2)
Below, the microwave heating equipment of embodiments of the present invention 2 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 2 and above-mentioned execution mode 1 is the configuration of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 2, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Fig. 5 is the stereogram that illustrates as the microwave oven of the microwave heating equipment of embodiments of the present invention 2.Fig. 6 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave in the microwave heating equipment of execution mode 2.
As shown in Figure 5, have as the microwave oven of the microwave heating equipment 1 of execution mode 2: heating chamber 2, it takes in heating object; And mounting portion 3, it takes in the mounting heating object.And, under mounting portion 3, at the upper surface of waveguide 5, at least alignment arrangements on the direction of transfer X have a plurality of in heating chamber 2 the microwave radiation portion 6 of the microwave of radiation circularly polarized wave.
As shown in Figure 5 and Figure 6, in the microwave heating equipment 1 of execution mode 2, on the upper surface (with heating chamber 2 facing surfaces) of waveguide 5, in the mode of arranging along the direction of transfer X of waveguide 5, be provided with a plurality of in heating chamber 2 the microwave radiation portion 6 of the circularly polarized wave of the roughly the same amount of radiation of radiation, as the microwave radiation unit.By disposing microwave radiation portion 6 in this wise, can realize evenly and microwave heating efficiently the heating object of heating chamber 2 inside.In Fig. 6, show following example: two microwave radiation portions 6 have predetermined space L(distance between centers), and these two microwave radiation portions 6 are in the position that the plumb line from the tubular axis P of waveguide 5 departs from, and are set up in parallel along the direction of transfer X of waveguide 5.
In addition, in the microwave heating equipment of execution mode 2, as long as a plurality of microwave radiation portion 6 is alignment arrangements on direction of transfer X at least, as microwave radiation portion 6, following structure is also contained in the structure of execution mode 2: also dispose a plurality of microwave radiation portion 6 not only on direction of transfer X, and on the direction vertical with direction of transfer X and direction of an electric field Y (Width Z).
[waveguide]
Use waveguide 5 as waveguide portion to be transmitted in to constitute by magnetron etc. as the microwave generation device 4 of microwave generating unit in produce microwave the time, by the direction of an electric field Y(of the frequency of the microwave that produces from the microwave generation device 4 that uses and waveguide 5 with reference to Fig. 5) on size, limited the size of the upper and lower bound on the direction vertical (Width Z) of waveguide 5 with direction of transfer X and direction of an electric field Y.
This is because used H ripple (TE ripple; Transverse electric wave transmits this transfer mode of TE10 pattern of (Transverse Electric Wave), and this TE10 pattern is generally only to have the magnetic field composition on the tube axial direction of waveguide and the transfer mode that do not have the electric field composition.In addition, the transfer mode beyond the TE10 pattern nearly all is not suitable for the waveguide of microwave heating equipment.
Then, use Fig. 7 that the rectangular waveguide 301 of the representative waveguide of conduct that carries microwave oven is described.As shown in Figure 7, the simplest common waveguide is the cuboid that extend along direction of transfer X in the rectangle cross section (width a * height b) fixed.In the rectangular waveguide 301 of this cuboid, when establishing microwave wavelength when being λ, the width a of waveguide 301 selects in the scope of (λ〉a〉λ/2), and the height b of waveguide 301 selects in the scope of (b＜λ/2).As everyone knows, width a and height b by selecting rectangular waveguide 301 in this wise can allow rectangular waveguide 301 transmit microwave with the TE10 pattern.
Herein, the TE10 pattern is meant in rectangular waveguide 301, only has the magnetic field composition and do not have H ripple (the TE ripple of electric field composition on the direction of transfer X of rectangular waveguide 301; Transverse electric wave transmission Transverse Electric Wave) transfer mode.In addition, the transfer mode beyond the TE10 pattern nearly all is not suitable for the waveguide 5 in the microwave heating equipment 1 of execution mode 1.
The wavelength X of the microwave in the microwave oven is about 120mm, generally in microwave oven, selects height b in many scopes about 80～100mm in the width a of selection waveguide, the scope about 15～40mm.
In rectangular waveguide shown in Figure 7 301, on the implication on the surface of vortex upper and lower surface is called H face 302 abreast in magnetic field, on the implication on the surface parallel with electric field, with about the surface be called E face 303.In addition, when the wavelength in pipe when establishing microwave and transmit in waveguide 301 was λ g, λ g represented by following formula (1).
λg = λ / 1 - ( λ / 2 a ) 2 - - - ( 1 )
As the formula (1), though wavelength in pipe λ g is irrelevant with the size of height b according to the change in size of width a.
In addition, in the TE10 pattern, going up electric field at the both sides end face (E face 303) of the Width (Z) of rectangular waveguide 301 is 0, in the central electric field maximum of Width (Z).Therefore, microwave generation device 4 such as magnetron is in central authorities' coupling of the Width (Z) of the waveguide 5 of electric field maximum.
(execution mode 3)
Below, the microwave heating equipment of embodiments of the present invention 3 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 3 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 3, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Fig. 8 is the stereogram that the microwave heating equipment of embodiments of the present invention 3 is shown.Fig. 9 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave in the microwave heating equipment of execution mode 3.
As shown in Figure 8, have as the microwave oven of the microwave heating equipment 1 of execution mode 3: heating chamber 2, it takes in heating object; And mounting portion 3, it takes in the mounting heating object.In addition, under mounting portion 3, at the upper surface of waveguide 5, on direction of transfer X, be disposed with at least a plurality of in heating chamber radiation as the microwave radiation portion 6 of the microwave of the roughly the same amount of circularly polarized wave.
In addition, in the microwave heating equipment of execution mode 3, the microwave radiation portion 6 of radiation circularly polarized wave makes two slits (elongated opening portion) intersected with each other and constitute the X word shape in heating chamber 2, and the long limit that constitutes each slit is with respect to the direction of transfer X in the waveguide 5 tilt (45 degree).
As shown in Figure 9, in the microwave heating equipment 1 of execution mode 3, alignment arrangements has the microwave radiation portion 6 of the X word shape of a plurality of radiation circularly polarized waves on direction of transfer X.As mentioned above, by disposing a plurality of microwave radiation portion 6, can realize evenly and microwave heating efficiently the heating object of heating chamber 2 inside.
In Fig. 9, show following example: the microwave radiation portion 6 of at least two X word shapes has predetermined space L, and described microwave radiation portion 6 is in the position that the plumb line from the tubular axis P of waveguide 5 departs from, and is set up in parallel along the direction of transfer X of waveguide 5.That is, in example shown in Figure 9, in a plurality of microwave radiation portion 6 of X word shape, the line that has linked the point that slit intersects is consistent with the direction of transfer X of waveguide 5.
In addition, in the microwave heating equipment of execution mode 3, as long as a plurality of microwave radiation portion 6 is alignment arrangements on direction of transfer X at least, as microwave radiation portion 6, following situation is also contained among the present invention: also dispose a plurality of microwave radiation portion 6 not only on direction of transfer X, and on the direction vertical with direction of transfer X and direction of an electric field Y (Width Z).
In the structure of the microwave heating equipment of execution mode 3, also as explanation in the above-mentioned execution mode 2, when using waveguide 5 to transmit from microwave that the microwave generation device 4 as the microwave generating unit that is made of magnetron etc. produces, by the size on the direction of an electric field Y of the frequency of the microwave that produces from the magnetron that uses and waveguide 5, limited the size of the upper and lower bound on the direction vertical (Width Z) of waveguide 5 with direction of transfer X and direction of an electric field Y.
In addition, condition as the shape of the microwave radiation portion 6 in the execution mode 3, as (a) that use Fig. 4 in the above-mentioned execution mode 1 is illustrated, the length (2p) of slit shown in Figure 9 (elongated opening portion) is wavelength in pipe λ g about more than 1/4 of the microwave that transmits in waveguide 5, two slits intersect in the central authorities of length direction each other, and each slit has tilted 45 ° with respect to direction of transfer X.
And the microwave radiation portion 6 that is made of two slits intersections constitutes, and the cross part of the slit of process microwave radiation portion 6 and the axle parallel with direction of transfer X are not in the position of the Electric Field Distribution symmetry that makes waveguide 5 inside.
For example, when waveguide 5 transmits microwave with the TE10 pattern, be the symmetry axis of the Electric Field Distribution of waveguide 5 inside through the central authorities of the waveguide 5 on the direction Z vertical and the tubular axis P that extends along direction of transfer X with the direction of transfer X of waveguide 5 and direction of an electric field Y.Therefore, in the structure of execution mode 3, the cross part of the slit of microwave radiation portion 6 is configured in from the symmetry axis of waveguide 5, is the position that the plumb line of the tubular axis P of waveguide 5 departs from.By disposing the slit of microwave radiation portion 6 in this wise, can allow microwave radiation portion 6 radiation circularly polarized wave reliably.
In addition, in a plurality of microwave radiation portion 6 of radiation circularly polarized wave, the interval of adjacent microwave radiation portion 6 is narrow more, and the electric field between the microwave radiation portion 6 is concentrated strong more, and the loss of microwave is big more, and the efficiency of heating surface is poor more.Microwave radiation portion 6 as adjacent preferably is configured with the interval more than the 5mm.Therefore, in the structure of execution mode 3, be configured to, enlarge the interval of adjacent microwave radiation portion 6 on the Width Z of waveguide 5 as much as possible.
In the microwave heating equipment 1 of the execution mode 3 that constitutes as mentioned above, need not to be provided with the mechanism that makes mounting table or antenna rotation and phase shifter etc., can realize uniform microwave heating to the heating objects in the heating chamber 2.The structure of the unequal problem of heating of the heating object when therefore, the microwave heating equipment 1 of execution mode 3 has the heating action that can prevent when the fault of rotating mechanism and produce during abnormal operation.
In addition, in the structure of execution mode 3, when transmitting by waveguide 5, as explanation in the above-mentioned execution mode 1 like that, be radiated heating chamber 2 interior microwave amounts from microwave radiation portion 6 and increase and decrease according to three conditions from microwave that microwave generation devices such as magnetron 4 produce.
First condition is the distance from microwave generation device 4 to microwave radiation portion 6 on direction of transfer X.Second condition is the distance from the end face 15 of waveguide 5 to microwave radiation portion 6 on direction of transfer X.The 3rd condition be in waveguide 5 with direction of transfer X and direction of an electric field Y(with reference to Fig. 2) position on the vertical direction (the Width Z of waveguide 5).
On the basis of having considered above condition, if the mode with the even microwave distribution in the heating chamber 2 does not dispose microwave radiation portion 6, even then microwave radiation portion 6 is configured to about the central authorities' symmetry in the heating chamber 2, it also is uneven that the microwaves under most situation in the heating chamber 2 distribute.
Therefore, on direction of transfer X, have in the microwave heating equipment 1 of execution mode 3 of a plurality of microwave radiation portion 6, the technology of the microwave changes in distribution in the heating chamber 2 is absolutely necessary.
(execution mode 4)
Below, the microwave heating equipment of embodiments of the present invention 4 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 4 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 4, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 10 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave in the microwave heating equipment of embodiments of the present invention 4.
As shown in figure 10, in the microwave heating equipment 1 of execution mode 4, on the upper surface (with heating chamber 2 facing surfaces) of waveguide 5, at least alignment arrangements on the direction of transfer X have a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.
In the microwave heating equipment of execution mode 4, the microwave radiation portion 6 of radiation circularly polarized wave makes two slits (elongated opening portion) intersected with each other and form the X word shape in heating chamber 2, and the long limit that constitutes each slit is with respect to the direction of transfer X of waveguide 5 tilt (45 degree).The structure of execution mode 4 is: the slit length 2p of microwave radiation portion 6 is according to the position on the direction of transfer X in the waveguide 5 and difference.In two microwave radiation portions 6 shown in Figure 10, show following example: the microwave radiation portion 6(approaching with the microwave generating unit 4 as the microwave generating unit that is made of magnetron is the microwave radiation portion on right side in Figure 10) opening portion form than in Figure 10, being the microwave radiation portion in left side from microwave generating unit 4 6(of microwave radiation portion far away) opening portion little, suppressed the amount of radiation of microwave.
Constitute as described above, become such structure: configuration relation by changing a plurality of microwave radiation portion 6 and slit length (aperture area) 2p in each microwave radiation portion 6, amount of radiation that can controlled microwave.Therefore, the microwave heating equipment of execution mode 4 constitutes, and can evenly and efficiently carry out microwave heating to the heating object in the heating chamber 2.
In addition, in the microwave heating equipment 1 of execution mode 4, as long as a plurality of microwave radiation portion 6 is alignment arrangements on direction of transfer X at least, as microwave radiation portion 6, following situation is also contained in the structure of execution mode 4: also dispose a plurality of microwave radiation portion 6 not only on direction of transfer X, and on the direction vertical with direction of transfer X and direction of an electric field Y (Width Z).
In the microwave heating equipment 1 of execution mode 4, about with the relation of other design considerations, be not limited to dispose a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2.In addition, even disposed a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2, because various parts such as heater and door glass are installed in the storehouse of microwave heating equipments such as microwave oven 1, and it also is uneven that the microwave under therefore most situation in the heating chamber 2 distributes.
Therefore, in the microwave heating equipment of execution mode 4, not only change the configuration of a plurality of microwave radiation portion 6, and the slit length 2p of change microwave radiation portion 6, thereby guaranteed the uniformity that the microwaves in the heating chamber 2 distribute.
In general, in the microwave radiation portion 6 that forms by two slits intersections,, reduce the aperture area of microwave radiation portion 6, make the microwave amounts that are radiated in the heating chamber 2 from microwave radiation portion 6 reduce thus by shortening the length 2p of slit.
For example, in waveguide shown in Figure 10 5, when the microwave of right side area distributes by force, the slit length 2p of the microwave radiation portion 6 by shortening the right side, thereby reduced the aperture area of the microwave radiation portion 6 on right side, reduced from the microwave radiation portion 6 on right side being radiated microwave amount in the heating chamber 2, made from the amount of radiation of the microwave of each microwave radiation portion 6 roughly the samely, can guarantee the uniformity that the microwaves in the heating chamber 2 distribute.
As mentioned above, in the microwave heating equipment of embodiments of the present invention 4, a plurality of microwave radiation portion 6 be the long limit of intersected with each other and each slit of two slits with respect to the shape that the direction of transfer X of waveguide 5 tilts, the long edge lengths 2p that constitutes slit is according to the position on the direction of transfer in the waveguide 5 and difference.In the microwave heating equipment of the execution mode 4 that constitutes like this, the configuration by changing microwave radiation portion 6 respectively and the slit length 2p of microwave radiation portion 6 can the controlled microwave amount of radiation, can evenly and efficiently carry out microwave heating to heating object.
In addition, in order to make the even microwave distribution in the heating chamber 2, the structure of microwave radiation portion 6 is according to each specification of microwave heating equipment, structure etc. and different.Therefore, by change the shape of slit of the microwave radiation portion 6 that should be arranged on the waveguide 5 according to each microwave heating equipment, can guarantee the uniformity that the microwave in the heating chamber 2 distributes.
In the structure of execution mode 4, also as explanation in the above-mentioned execution mode 2, when using waveguide 5 to transmit from microwave that microwave generation devices such as magnetron 4 produce, by the size on the direction of an electric field Y of the frequency of the microwave that produces from the magnetron that uses and waveguide 5, limited the size of the upper and lower bound on the direction vertical (Width Z) of waveguide 5 with direction of transfer X and direction of an electric field Y.
In addition, condition as the shape of the microwave radiation portion 6 in the execution mode 4, as (a) that use Fig. 4 in the above-mentioned execution mode 1 is illustrated, the length 2p of slit shown in Figure 10 (elongated opening portion) is wavelength in pipe λ g about more than 1/4 of the microwave that transmits in waveguide 5, two slits intersect in the central authorities of length direction each other, and each slit has tilted 45 ° with respect to direction of transfer X.
And the microwave radiation portion 6 that is made of two slits intersections constitutes, and the cross part of the slit of process microwave radiation portion 6 and the axle parallel with direction of transfer X are not in the position of the Electric Field Distribution symmetry that makes waveguide 5 inside.
For example, when waveguide 5 transmits microwave with the TE10 pattern, be the symmetry axis of the Electric Field Distribution of waveguide 5 inside through the central authorities of the waveguide 5 on the direction Z vertical and the tubular axis P that extends along direction of transfer X with the direction of transfer X of waveguide 5 and direction of an electric field Y.Therefore, in the structure of execution mode 4, the cross part of the slit of microwave radiation portion 6 is configured in from the symmetry axis of waveguide 5, is the position that the plumb line of the tubular axis P of waveguide 5 departs from.By disposing the slit of microwave radiation portion 6 in this wise, can allow microwave radiation portion 6 radiation circularly polarized wave reliably.
In addition, in a plurality of microwave radiation portion 6 of radiation circularly polarized wave, the interval of adjacent microwave radiation portion 6 is narrow more, and the electric field between the microwave radiation portion 6 is concentrated strong more, and the loss of microwave is big more, and the efficiency of heating surface is poor more.Microwave radiation portion 6 as adjacent preferably is configured with the interval more than the 5mm.Therefore, in the structure of execution mode 4, be configured to, enlarge the interval of adjacent microwave radiation portion 6 on the Width Z of waveguide 5 as much as possible.
In addition, in the structure of execution mode 4, when transmitting by waveguide 5, as explanation in the above-mentioned execution mode 1 like that, be radiated heating chamber 2 interior microwave amounts from microwave radiation portion 6 and increase and decrease according to three conditions from microwave that microwave generation devices such as magnetron 4 produce.
First condition be on direction of transfer X from microwave generation device 4 to microwave radiation portion 6 distance.Second condition is the distance from the end face 15 of waveguide 5 to microwave radiation portion 6 on direction of transfer X.The 3rd condition be in waveguide 5 with direction of transfer X and direction of an electric field Y(with reference to Fig. 2) position on the vertical direction (the Width Z of waveguide 5).
On the basis of having considered above condition, if the mode with the even microwave distribution in the heating chamber 2 does not dispose microwave radiation portion 6, even then dispose microwave radiation portion symmetrically about the central authorities in the heating chamber 2, the microwave distribution in the heating chamber 2 also is uneven under the situation mostly.
Therefore, on direction of transfer X, have in the microwave heating equipment 1 of execution mode 4 of a plurality of microwave radiation portion 6, the technology of the microwave changes in distribution in the heating chamber 2 is absolutely necessary.
(execution mode 5)
Below, the microwave heating equipment of embodiments of the present invention 5 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 5 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 5, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 11 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave in the microwave heating equipment of embodiments of the present invention 5.
As shown in figure 11, in the microwave heating equipment 1 of execution mode 5, on the upper surface (with heating chamber 2 facing surfaces) of waveguide 4, at least alignment arrangements on the direction of transfer X have a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.
In the microwave heating equipment of execution mode 5, the microwave radiation portion 6 of radiation circularly polarized wave in heating chamber 2 (left-hand polarized wave or right-handed polarized wave) makes two slits (elongated opening portion) intersected with each other and form the X word shape, and the long limit that constitutes each slit is with respect to the direction of transfer X of waveguide 5 tilt (45 degree).The structure of execution mode 5 is: the slit width 2q in the microwave radiation portion 6 is according to the position on the direction of transfer X in the waveguide 5 and difference.
In two microwave radiation portions 6 shown in Figure 11, show following example: the microwave radiation portion 6(approaching with the microwave generation device that is made of magnetron 4 is the microwave radiation portion on right side in Figure 11) opening portion form than in Figure 11, being the microwave radiation portion in left side from microwave generation device 4 6(of microwave radiation portion far away) opening portion little, suppressed the amount of radiation of microwave.
The microwave heating equipment of the execution mode 5 of Gou Chenging constitutes as mentioned above, configuration relation by changing a plurality of microwave radiation portion 6 and the slit width (aperture area) in each microwave radiation portion 6, amount of radiation that can controlled microwave.Therefore, in the microwave heating equipment of execution mode 5, can evenly and efficiently carry out microwave heating to the heating object in the heating chamber 2.
In addition, in the microwave heating equipment of execution mode 5, as long as a plurality of microwave radiation portion 6 is alignment arrangements on direction of transfer X at least, as microwave radiation portion 6, following structure is also contained in the structure of execution mode 5: not only on direction of transfer X, also dispose a plurality of microwave radiation portion 6 on the direction vertical with direction of transfer X and direction of an electric field Y (Width Z).
In the microwave heating equipment 1 of execution mode 5, about with the relation of other design considerations, be not limited to dispose a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2.In addition, even disposed a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2, because various parts such as heater and door glass are installed in the storehouse of microwave heating equipments such as microwave oven 1, and it also is uneven that the microwave under therefore most situation in the heating chamber 2 distributes.
Therefore, in the microwave heating equipment of execution mode 5, not only change the configuration of a plurality of microwave radiation portion 6, and the slit width 2q of change microwave radiation portion 6, guaranteed the uniformity that the microwaves in the heating chamber 2 distribute thus.
In general, in the microwave radiation portion 6 that forms by two slits intersections,, reduce the aperture area of microwave radiation portion 6, make the microwave amounts that are radiated in the heating chamber 2 from microwave radiation portion 6 reduce thus by shortening the width 2q of slit.
For example, when the microwave of the right side area in the waveguide shown in Figure 11 5 (zone approaching with microwave generation device 4) distributes when strong, the slit width 2q of 2 microwave radiation portions 6 by increasing left field (from microwave generation device 4 zone far away) can increase the aperture area of the microwave radiation portion 6 of left field.Its result has increased from the microwave radiation portion 6 of left field and has been radiated microwave amount in the heating chamber 2, can guarantee the uniformity that the microwaves in the heating chamber 2 distribute.
In the structure of execution mode 5, also as explanation in the above-mentioned execution mode 2, when using waveguide 5 to transmit from microwave that microwave generation devices such as magnetron 4 produce, by the size on the direction of an electric field Y of the frequency of the microwave that produces from the magnetron that uses and waveguide 5, limited the size of the upper and lower bound on the direction vertical (Width Z) of waveguide 5 with direction of transfer X and direction of an electric field Y.
In addition, condition as the shape of the microwave radiation portion 6 in the execution mode 5, as (a) that use Fig. 4 in the above-mentioned execution mode 1 is illustrated, the length (2p) of slit shown in Figure 11 (elongated opening portion) is wavelength in pipe λ g about more than 1/4 of the microwave that transmits in waveguide 5, two slits intersect in the central authorities of length direction each other, and each slit has tilted 45 ° with respect to direction of transfer X.
And the microwave radiation portion 6 that is made of two slits intersections constitutes, and the cross part of the slit of process microwave radiation portion 6 and the axle parallel with direction of transfer X are not in the position of the Electric Field Distribution symmetry that makes waveguide 5 inside.
For example, when waveguide 5 transmits microwave with the TE10 pattern, be the symmetry axis of the Electric Field Distribution of waveguide 5 inside through the tubular axis P central and that extend along direction of transfer X on the Width Z of waveguide 5.Therefore, in the structure of execution mode 5, the cross part of the slit of microwave radiation portion 6 is configured in from the symmetry axis of waveguide 5, is the position that the plumb line of the tubular axis P of waveguide 5 departs from.By disposing the slit of microwave radiation portion 6 in this wise, can allow microwave radiation portion 6 radiation circularly polarized wave reliably.
In addition, in a plurality of microwave radiation portion 6 of radiation circularly polarized wave, the interval of adjacent microwave radiation portion 6 is narrow more, and the electric field between the microwave radiation portion 6 is concentrated strong more, and the loss of microwave is big more, and the efficiency of heating surface is poor more.Microwave radiation portion 6 as adjacent preferably is configured with the interval more than the 5mm.Therefore, in the structure of execution mode 5, be configured to, enlarge the interval of adjacent microwave radiation portion 6 on the Width Z of waveguide 5 as much as possible.
In addition, in the structure of execution mode 5, when transmitting by waveguide 5, as explanation in the above-mentioned execution mode 1 like that, be radiated heating chamber 2 interior microwave amounts from microwave radiation portion 6 and increase and decrease according to three conditions from microwave that microwave generation devices such as magnetron 4 produce.
First condition be on direction of transfer X from microwave generation device 4 to microwave radiation portion 6 distance.Second condition is the distance from the end face 15 of waveguide 5 to microwave radiation portion 6 on direction of transfer X.The 3rd condition be in waveguide 5 with direction of transfer X and direction of an electric field Y(with reference to Fig. 2) position on the vertical direction (the Width Z of waveguide 5).
On the basis of having considered above condition, if the mode with the even microwave distribution in the heating chamber 2 does not dispose microwave radiation portion 6, even then dispose microwave radiation portion symmetrically about the central authorities in the heating chamber 2, the microwave distribution in the heating chamber 2 also is uneven under the situation mostly.
Therefore, on direction of transfer, have in the microwave heating equipment 1 of execution mode 5 of a plurality of microwave radiation portion 6, the technology of the microwave changes in distribution in the heating chamber 2 is absolutely necessary.
In the microwave heating equipment of embodiments of the present invention 5, a plurality of microwave radiation portion 6 shape that to be long limits of making intersected with each other and each slit of two slits tilt with respect to the direction of transfer X of waveguide 5, the width 2q that constitutes slit is according to the position on the direction of transfer X in the waveguide 5 and difference.In the microwave heating equipment of the execution mode 5 that constitutes like this, not only change the configuration of microwave radiation portion 6, but also the slit width 2q of change microwave radiation portion 6, the microwave that can change thus in the heating chamber 2 distributes, and can guarantee the uniformity that the microwave in the heating chamber 2 distributes.
(execution mode 6)
Below, the microwave heating equipment of embodiments of the present invention 6 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 6 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 6, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 12 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave in the microwave heating equipment of embodiments of the present invention 6.
As shown in figure 12, in the microwave heating equipment 1 of execution mode 6, on the upper surface (with heating chamber 2 facing surfaces) of waveguide 5, at least alignment arrangements on the direction of transfer X have a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.
In the microwave heating equipment 1 of execution mode 6, the microwave radiation portion 6 of radiation circularly polarized wave makes two slits (elongated opening portion) intersected with each other and form the X word shape in heating chamber 2, and the long limit that constitutes each slit is with respect to the direction of transfer X in the waveguide 5 tilt (45 degree).The microwave heating equipment 1 of execution mode 6 in microwave radiation portion 6 in shape, to cross section 12(Figure 12 with reference to) the bight carried out R chamfer machining or C chamfer machining.
The microwave heating equipment 1 of the execution mode 6 of Gou Chenging can reduce the microwave loss in the microwave radiation portion 6 as mentioned above, can carry out microwave heating to heating object efficiently.
Microwave has the character in the segment set of the point of bight or end.Therefore,, have in its cross part office under the situation of shape of point, can produce the electric field that causes by microwave to concentrate the problem that exists the efficiency of heating surface to reduce intersected with each other by two slits and in the microwave radiation portion 6 that constitutes.
Therefore, in the microwave heating equipment 1 of execution mode 6, to intersected with each other by two slits and bight part cross section 12 in the microwave radiation portion 6 that constitutes has been implemented R chamfer machining or C chamfer machining, alleviate concentrating of electric field thus, can improve the efficiency of heating surface.
(execution mode 7)
Below, the microwave heating equipment of embodiments of the present invention 7 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 7 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 7, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 13 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave in the microwave heating equipment of embodiments of the present invention 7.
As shown in figure 13, in the microwave heating equipment 1 of execution mode 7, on the upper surface (with heating chamber 2 facing surfaces) of waveguide 5, at least alignment arrangements on the direction of transfer X have a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.
In the microwave heating equipment 1 of execution mode 7, the microwave radiation portion 6 of radiation circularly polarized wave makes two slits (elongated opening portion) intersected with each other and form the X word shape in heating chamber 2, and the long limit that constitutes each slit is with respect to the direction of transfer X in the waveguide 5 tilt (45 degree).The microwave heating equipment 1 of execution mode 7 has carried out R chamfer machining or C chamfer machining to the end portion 13 of each slit in microwave radiation portion 6 in shape.
The microwave heating equipment 1 of the execution mode 7 of Gou Chenging can reduce the microwave loss in the microwave radiation portion 6 as mentioned above, can carry out microwave heating to heating object efficiently.
Microwave has the character in the segment set of the point of bight or end.Therefore, intersected with each other by two slits and in the microwave radiation portion that constitutes, under the situation of the slightly pointed shape of end portion 13 tools of slit, can produce the electric field that causes by microwave to concentrate the problem that exists the efficiency of heating surface to reduce.
Therefore, in the microwave heating equipment 1 of execution mode 7,, therefore alleviated electric field to concentrate, improved the efficiency of heating surface intersected with each other by two slits and end portion 13 slit in the microwave radiation portion 6 that constitutes has been carried out R chamfer machining or C chamfer machining.
In addition, Figure 14 is the figure that the concrete structure of the microwave radiation portion 6 in above-mentioned execution mode 6 and the execution mode 7 is shown, and shows to make two slits (elongated opening portion) intersected with each other and form an example of the microwave radiation portion 6 of X word shape.
As shown in figure 14, show the example of the cross section 12 of the slit in the microwave radiation portion 6 having been implemented R chamfer machining or C chamfer machining, show the example of the end portion 13 of slit having been implemented R chamfer machining or C chamfer machining.In the present invention,, then can alleviate electric field and concentrate, can realize the raising of the efficiency of heating surface if the cross section 12 of slit and end portion 13 are carried out any one processing in R chamfer machining or the C chamfer machining.
(execution mode 8)
Below, the microwave heating equipment of embodiments of the present invention 8 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 8 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 8, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 15 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave in the microwave heating equipment of embodiments of the present invention 8.
As shown in figure 15, in the microwave heating equipment 1 of execution mode 8, at least have on the direction of transfer X a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.
Microwave radiation portion 6 makes two shapes that slit is intersected with each other and long limit each slit tilts with respect to the direction of transfer X in the waveguide 5.In structure shown in Figure 15, two microwave radiation portions 6 on the right side of arranging on direction of transfer X have structure as described below: from be positioned at the microwave radiation portion of the central authorities of Figure 15 as the long 6(of microwave radiation portion of the transmitting range that the position is set of the microwave generation device 4 of microwave generating unit) be positioned at the microwave radiation portion of the right-hand member of Figure 15 with the 6(of microwave radiation portion that lacks from the transmitting range that the position is set of microwave generation device 4) compare, from the microwave radiation rate height of waveguide 5 to heating chamber 2.In addition, in the structure of execution mode 8, the a plurality of microwave radiation portion 6 of arranging on direction of transfer X also can constitute: from the long microwave radiation portion 6 of the transmitting range that the position is set of microwave generation device 4 with compare from the short microwave radiation portion 6 of the transmitting range that the position is set of microwave generation device 4, uprise successively from the microwave radiation rate of waveguide 5 to heating chamber 2.
By aforesaid structure, give off roughly the same microwave from each microwave radiation portion 6, the heating object of heating chamber 2 inside is carried out uniform microwave heating, can carry out microwave heating to heating object efficiently.Herein, radiance is from the microwave radiation amount of each microwave radiation portion 6 radiation ratio with respect to the microwave transmission amount that transmits in the inside of waveguide 5.
In addition, in the microwave heating equipment 1 of execution mode 8, as long as a plurality of microwave radiation portion 6 is alignment arrangements on direction of transfer X at least, as microwave radiation portion 6, following situation is also contained in the structure of execution mode 8: also dispose a plurality of microwave radiation portion 6 not only on direction of transfer X, and on the direction vertical with direction of transfer X and direction of an electric field Y (Width Z).
In the microwave heating equipment 1 of execution mode 8, about with the relation of other design considerations, be not limited to dispose a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2.In addition, even disposed a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2, because various parts such as heater and door glass are installed in the storehouse of microwave heating equipments such as microwave oven 1, and it also is uneven that the microwave under therefore most situation in the heating chamber 2 distributes.
In addition, usually, under the situation that has a plurality of microwave radiation portion 6 on the direction of transfer X, even the waveguide 5 from each microwave radiation portion 6 is identical to the microwave radiation rate of heating chamber 2, also be from the short more microwave of microwave radiation portion 6 radiation of the transmitting range that the position is set of microwave generation device 4.
Its result, even dispose a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2, the microwaves in the heating chamber 2 distribute also inhomogeneous, when microwave heating cook, produce on can the heating object heating chamber 2 in and heat inequality.
This be because: be by from the short microwave radiation portion 6 of the transmitting range that the position is set of microwave generation device 4, microwave radiation in heating chamber 2 successively, so along the direction of transfer X of waveguide 5, the conveying capacity of microwave reduces successively.
Therefore, in the microwave heating equipment of execution mode 8, not only change the configuration of a plurality of microwave radiation portion 6, and change, can guarantee the reliable uniformity that the microwaves in the heating chamber 2 distribute thus from the waveguide 5 of each microwave radiation portion 6 microwave radiation rate to heating chamber 2.
As mentioned above, in the microwave heating equipment of execution mode 8, microwave radiation portion 6 makes the shape that two slits (elongated opening portion) are intersected with each other and long limit each slit tilts with respect to the direction of transfer X in the waveguide 5.As the example of the radiance that changes the microwave radiation portion 6 that constitutes in this wise, can enumerate following example:, increase and decrease the aperture area of microwave radiation by the length (2p) of change slit or the width (2q) of slit.
For example, as shown in figure 16, on the upper surface (with heating chamber 2 facing surfaces) of rectangular-shaped waveguide 5, be provided with two and be listed in the microwave radiation portion 6 that forms a line on the direction of transfer X, be provided with three and be listed in the microwave radiation portion 6 that forms a line on the direction vertical (Width Z), that is to say 6 the microwave radiation portions 6 that add up to that are provided with direction of transfer X and direction of an electric field Y.Rectangular waveguide 5 by being provided with 6 microwave radiation portions 6 in this wise transmits microwave.
Formula shown below (1) is a formula of asking for the degree of coupling Cu of cross directional coupler.To determining that according to the formula (1) of asking for the degree of coupling Cu of cross directional coupler the method for the shape of microwave radiation portion 6 describes.
In addition, in the microwave heating equipment of embodiments of the present invention 8, the degree of coupling Cu of cross directional coupler is meant from the waveguide 5 of each microwave radiation portion 6 microwave radiation rate to heating chamber 2.
Cu =
- 20 log 10 [ 2 πM / a 2 b × 1 / ( 1 - f 2 / fr 2 ) × sin ( 2 πX 0 / a ) × sin ( 4 πX 0 / λ g ) ]
+ 27.3 1 - ( 4 p / λ ) 2 × ( t / 2 p ) [ dB ]
(1)
Wherein, define each parameter (with reference to Fig. 7 and Fig. 9) in the following formula (1) as follows.
A: long limit (A) size [mm] of rectangular waveguide 5
B: the minor face of rectangular waveguide 5 (B) size [mm]
P: the 1/2(major radius of the length of slit (2p)) [mm]
Q: the 1/2(short radius of the width of slit (2q)) [mm]
T: the thickness of slab of waveguide faying face [mm]
λ g: wavelength in pipe [mm]
λ: the wavelength in the free space [mm]
X 0: the distance between centers [mm] of the tubular axis of waveguide 5 and microwave radiation portion 6
F: the frequency of oscillation of microwave generating unit 4 [Hz]
Fr=c/ (4p-1.092q) fr: the resonance frequency of slit (establish p〉〉 q) [Hz]
C: light velocity (≒ 3 * 10 11) [mm]
M=π p 3/ 3[log e(4p/q)-1] M: the polarizability () of the long axis direction of slit
In following formula (1),, can consider following condition: from the microwave of each microwave radiation portion 6 radiation same amount in heating chamber 2 as the condition that is used to realize to all even microwave heating efficiently of heating object; And the progressive wave that produces from microwave generation device 4 all is radiated in the heating chamber 2, that is to say on the end face 15 of waveguide 5 not produce reflected wave.
Therefore, under these conditions, when the number of microwave radiation portion 6 is 6, as long as from each microwave radiation portion 6 with respect to about 16.7% microwave radiation of the microwave amount that produces from microwave generation device 4 in heating chamber 2.
In addition, in the microwave heating equipment of embodiments of the present invention 8, as an example, to setting above-mentioned each parameter as follows, and only change each microwave radiation portion 6 slit length separately, the situation of adjusting the radiance of each microwave radiation portion 6 thus describes.
For example, set the length that each parameter in the formula (1) is determined slit as follows.
A: long limit (A) size=100.0mm of rectangular waveguide
B: the minor face of rectangular waveguide (B) size=30.0mm
Q: the 1/2(short radius of the width of slit)=5.0mm
T: the thickness of slab=1.0mm of waveguide faying face
λ g: wavelength in pipe=154.7mm
λ: the wavelength=122.4mm in the free space
X 0: the distance between centers=25.0mm of the tubular axis of waveguide 5 and microwave radiation portion 6
F: the frequency of oscillation of microwave generating unit 4=2450 * 10 6Hz
For from the identical microwave radiation portion 6 of the transmitting range that the position is set of microwave generation device 4, need to make identical to the microwave radiation rate of heating chamber 2.At this moment, about 16.7% of the microwave amount that in heating chamber 2, produces in the microwave radiation generation device 4 separately of each microwave radiation portion 6 microwave.Replenish, the formula of cross directional coupler (1) is the formula when having 2 microwave radiation portions herein.Therefore, as long as set slit length as follows: by a side who lacks from the transmitting range that the position is set of microwave generation device 4, the radiance of per two microwave radiation portions 6 is followed successively by 4.8dB(promptly, two the initial radiation 33.4%=16.7% of microwave radiation portion * 2), 50% in ensuing two the microwave radiation portion radiation residue of 3.0dB(), 0dB(latter two microwave radiation portion radiation remaining whole, promptly 100%).Therefore, through type (1), by a side who lacks from the transmitting range that the position is set of microwave generation device 4, the slit length 2p of each microwave radiation portion 6 is 53.6mm, 55.0mm, 57.0mm.
In addition, in the microwave heating equipment of embodiments of the present invention 8, though to the quantity of microwave radiation portion 6 is that 6 situation is illustrated, and the invention is not restricted to 6 situation, just can use as long as on direction of transfer X, have a plurality of microwave radiation portion 6.
In addition, in the microwave heating equipment of execution mode 8, the structure of the slit length 2p that only changes each microwave radiation portion 6 being adjusted the radiance of each microwave radiation portion 6 is illustrated, but is not limited to this structure.The present invention also comprise change above-mentioned rectangular waveguide 301(with reference to Fig. 7) other parameters such as length of 1/2 of minor face (B) size, slit width of long limit (A) size, rectangular waveguide adjust the structure of the radiance of each microwave radiation portion 6.
In addition, when from each microwave radiation portion 6 when the microwave radiation amount of heating chamber 2 is inhomogeneous, for example, on direction of transfer X, has a plurality of microwave radiation portion 6, and wish to adjust by changing parameter by the situation that begins a plurality of microwaves of radiation successively from the long microwave radiation portion 6 of the transmitting range that the position is set of microwave generation device 4 etc.
And, part at the progressive wave that produces from microwave generation device 4 is not radiated in the heating chamber 2, and on the end face 15 of waveguide, produced in the situation etc. of reflected wave, this reflected wave of needs consideration changes parameter and adjusts, and makes even to the microwave radiation amount of heating chamber 2 from microwave radiation portion 6
(execution mode 9)
Below, the microwave heating equipment of embodiments of the present invention 9 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 9 and above-mentioned execution mode 1 is the configuration of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 9, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 17 is the stereogram that illustrates as the microwave oven of the microwave heating equipment of embodiments of the present invention 9.Figure 18 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave) in the microwave heating equipment of execution mode 9.
As shown in figure 17, the microwave oven as the microwave heating equipment 1 of execution mode 9 has: take in the heating chamber 2 of heating object, be provided with the door 7 with window in the front of this heating chamber 2; And the mounting portion 3 of nonmetallic materials, it takes in the mounting heating object.
And, in the microwave radiation unit that has microwave radiation in heating chamber 2 under the mounting portion 3.As the microwave radiation unit in the execution mode 9, on the direction vertical (Width Z), be disposed with direction of transfer X and direction of an electric field Y a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave).
As shown in figure 18, in the microwave heating equipment 1 of execution mode 9, by on the direction vertical (Width Z) of waveguide 5, be provided with direction of transfer X and direction of an electric field Y a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave), can evenly and efficiently carry out microwave heating to the heating objects in the heating chamber 2.
In addition, in the microwave heating equipment of execution mode 9, as long as a plurality of microwave radiation portion 6 is alignment arrangements on the direction Z vertical with direction of transfer X and direction of an electric field Y at least, as microwave radiation portion 6, following structure is also contained in the structure of execution mode 9: not only on the direction vertical with direction of transfer X and direction of an electric field Y (Width Z), and also dispose a plurality of microwave radiation portion 6 in direction of transfer X.
(execution mode 10)
Below, the microwave heating equipment of embodiments of the present invention 10 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 10 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 10, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 19 is the stereogram that the microwave heating equipment of embodiments of the present invention 10 is shown.Figure 20 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave) in the microwave heating equipment of execution mode 10.
As shown in figure 19, the microwave oven as the microwave heating equipment 1 of execution mode 10 has: take in the heating chamber 2 of heating object, be provided with the door 7 with window in the front of this heating chamber 2; And the mounting portion 3 of nonmetallic materials, it takes in the mounting heating object.In addition, under mounting portion 3, has the microwave radiation portion 6 of the microwave of radiation circularly polarized wave in heating chamber 2 (left-hand polarized wave or right-handed polarized wave).At least on the direction Z vertical, be disposed with direction of transfer X and direction of an electric field Y a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.
In addition, in the microwave heating equipment of execution mode 10, the microwave radiation portion 6 of radiation circularly polarized wave makes two slits (elongated opening portion) intersected with each other and form the X word shape in heating chamber 3, and the long limit that constitutes each slit is with respect to the direction of transfer X in the waveguide 5 tilt (45 degree).
As shown in figure 20, in the microwave heating equipment 1 of execution mode 10, at least the direction vertical (Width Z) with direction of transfer X and direction of an electric field Y go up alignment arrangements have a plurality of in microwave heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.By disposing a plurality of microwave radiation portion 6 in this wise, can realize evenly and microwave heating efficiently the heating objects in the heating chamber 2.
In Figure 20, the microwave radiation portion 6 of at least two X word shapes is configured in the position of symmetry with the both sides on the plumb line of the tubular axis P of predetermined space in waveguide 5.That is, setting is arranged by two microwave radiation portions 6 on the Width Z of waveguide 5.In example shown in Figure 20, the line that has linked the point that slit intersects in two microwave radiation portions 6 of X word shape is consistent with the Width Z of waveguide 5.
In addition, in the microwave heating equipment of execution mode 10, about a plurality of microwave radiation portion 6, as long as go up a plurality of microwave radiation of alignment arrangements portion 6 in the direction vertical (Width Z) at least with direction of transfer X and direction of an electric field Y, following situation is also contained among the present invention: also dispose a plurality of microwave radiation portion 6 not only on Width Z, and on direction of transfer X.
In the structure of the microwave heating equipment of execution mode 10, also as explanation in the above-mentioned execution mode 2, when using waveguide 5 to transmit from microwave that the microwave generation device 4 that is made of magnetron etc. produces, by the size on the direction of an electric field Y of the frequency of the microwave that produces from the magnetron that uses and waveguide 5, limited the size of the upper and lower bound on the direction vertical (Width Z) of waveguide 5 with direction of transfer X and direction of an electric field Y.
In addition, condition as the shape of the microwave radiation portion 6 in the execution mode 10, as (a) that use Fig. 4 in the above-mentioned execution mode 1 is illustrated, the length (2p) of slit shown in Figure 20 (elongated opening portion) is wavelength in pipe λ g about more than 1/4 of the microwave that transmits in waveguide 5, two slits intersect in the central authorities of length direction each other, and each slit has tilted 45 ° with respect to direction of transfer X.
And the microwave radiation portion 6 that is made of two slits intersections constitutes, and the cross part of the slit of process microwave radiation portion 6 and the axle parallel with direction of transfer X are inconsistent with the position (tubular axis) of the Electric Field Distribution symmetry that makes waveguide 5 inside.
For example, when transmitting microwave with the TE01 pattern, in mode, there is the symmetry axis (tubular axis P) of the Electric Field Distribution of extending along direction of transfer X through the central authorities of the waveguide 5 on the direction (Width Z) vertical with the direction of transfer X of waveguide 5 and direction of an electric field Y.Therefore, the cross part of slit must be arranged on the position that the middle position from the Width Z of waveguide 5 departs from.
For example, when waveguide 5 transmits microwave with the TE10 pattern, be the symmetry axis of the Electric Field Distribution of waveguide 5 inside through the central authorities of the waveguide 5 on the direction Z vertical and the tubular axis P that extends along direction of transfer X with the direction of transfer X of waveguide 5 and direction of an electric field Y.Therefore, in the structure of execution mode 10, the cross part of the slit of microwave radiation portion 6 is configured in from the symmetry axis of waveguide 5, is the position that the plumb line of the tubular axis P of waveguide 5 departs from.By disposing microwave radiation portion 6 in this wise, can allow microwave radiation portion 6 radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave) reliably.
In addition, in a plurality of microwave radiation portion 6 of radiation circularly polarized wave, the interval of adjacent microwave radiation portion 6 is narrow more, and the electric field between the microwave radiation portion 6 is concentrated strong more, and the loss of microwave is big more, and the efficiency of heating surface is poor more.Microwave radiation portion 6 as adjacent preferably is configured with the interval more than the 5mm.Therefore, in the structure of execution mode 10, be configured to, enlarge the interval of adjacent microwave radiation portion 6 on the Width Z of waveguide 5 as much as possible.
In the microwave heating equipment 1 of the execution mode 10 that constitutes as mentioned above, need not to be provided with the mechanism that makes mounting table or antenna rotation and phase shifter etc., can realize uniform microwave heating to the heating object of heating chamber 2.Therefore, in the microwave heating equipment 1 of execution mode 10, can prevent reliably when the fault of rotating mechanism and the unequal problem of heating of the heating object during the heating action that produces during abnormal operation.
(execution mode 11)
Below, the microwave heating equipment of embodiments of the present invention 11 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 11 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 11, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 21 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave) in the microwave heating equipment of embodiments of the present invention 11.
As shown in figure 21, in the microwave heating equipment 1 of execution mode 11, on the upper surface (with heating chamber 2 facing surfaces) of waveguide 5, at least the direction vertical (Width Z) with direction of transfer X and direction of an electric field Y go up alignment arrangements have a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.
In the microwave heating equipment of execution mode 11, the microwave radiation portion 6 of radiation circularly polarized wave makes two slits intersected with each other and form the X word shape in heating chamber 2, and the long limit that constitutes each slit is with respect to the direction of transfer X in the waveguide 5 tilt (45 degree).The structure of execution mode 11 is as follows: the slit length 2p of microwave radiation portion 6 according in the waveguide 5 with the vertical direction (Width Z) of direction of transfer X and direction of an electric field Y on the position and different.
The microwave heating equipment of the execution mode 11 of Gou Chenging constitutes as mentioned above, configuration relation by changing a plurality of microwave radiation portion 6 and the length (aperture area) of the slit 2p in each microwave radiation portion 6, amount of radiation that can controlled microwave.Therefore, in the microwave heating equipment of execution mode 11, can evenly and efficiently carry out microwave heating to the heating object in the heating chamber 2.
In addition, in the microwave heating equipment 1 of execution mode 11, get final product so long as on the Z of Width at least of waveguide 5, have the structure of a plurality of microwave radiation portion 6, as microwave radiation portion 6, following structure is also contained in the structure of execution mode 11: also dispose a plurality of microwave radiation portion 6 not only on Width Z, and on direction of transfer X.
In the microwave heating equipment 1 of execution mode 11, about with the relation of other design considerations, be not limited to dispose a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2.In addition, even disposed a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2, because various parts such as heater and door glass are installed in the storehouse of microwave heating equipments such as microwave oven 1, and it also is uneven that the microwave under therefore most situation in the heating chamber 2 distributes.
Therefore, in the microwave heating equipment of execution mode 11, not only change the configuration of a plurality of microwave radiation portion 6, and the slit length 2p of change microwave radiation portion 6, guaranteed the uniformity that the microwaves in the heating chamber 2 distribute thus.
In general, in the microwave radiation portion 6 that forms by two slits intersections,, reduce the aperture area of microwave radiation portion 6, make the microwave amounts that are radiated in the heating chamber 2 from microwave radiation portion 6 reduce thus by shortening the length 2p of slit.
For example, (towards direction of transfer and zone on the right side: the microwave upside of Figure 21) distributes when strong when rear side zone in the waveguide shown in Figure 21 5, shorten Figure 21 the rear side zone intersect the slit length 2p of the microwave radiation portion 6 that forms by two slits, reduce the aperture area of microwave radiation portion 6.Its result has reduced from the microwave radiation portion 6 in rear side zone being radiated microwave amount in the heating chamber 2, makes roughly the samely from the microwave radiation amount of each microwave radiation portion 6, can guarantee the uniformity that the microwaves in the heating chamber 2 distribute.
As mentioned above, the microwave heating equipment of embodiments of the present invention 11 constitutes, a plurality of microwave radiation portion 6 makes two shapes that slit is intersected with each other and long limit each slit tilts with respect to the direction of transfer X in the waveguide 5, the long edge lengths 2p of slit according in the waveguide 5 with the vertical direction Z of direction of transfer X and direction of an electric field Y on the position and different.The microwave heating equipment of the execution mode 11 of Gou Chenging can evenly and efficiently carry out microwave heating to heating object like this.
In the structure of execution mode 11, also as explanation in the above-mentioned execution mode 2, when using waveguide 5 to transmit from microwave that the microwave generation device 4 that is made of magnetron etc. produces, by the size on the direction of an electric field Y of the frequency of the microwave that produces from the magnetron that uses and waveguide 5, limited the size of the upper and lower bound on the direction vertical (Width Z) of waveguide 5 with direction of transfer X and direction of an electric field Y.
In addition, condition as the shape of the microwave radiation portion 6 in the execution mode 11, as (a) that use Fig. 4 in the above-mentioned execution mode 1 is illustrated, the length (2p) of slit shown in Figure 21 (elongated opening portion) is wavelength in pipe λ g about more than 1/4 of the microwave that transmits in waveguide 5, two slits intersect in the central authorities of length direction each other, and each slit has tilted 45 ° with respect to direction of transfer X.
And the microwave radiation portion 6 that is made of two slits intersections constitutes, and the cross part of the slit of process microwave radiation portion 6 and the axle parallel with direction of transfer X are not in the position of the Electric Field Distribution symmetry that makes waveguide 5 inside.
For example, when waveguide 5 transmits microwave with the TE10 pattern, be the symmetry axis of the Electric Field Distribution in the waveguide 5 through the central authorities of the waveguide 5 on the direction Z vertical and along the tubular axis P that direction of transfer X extends with the direction of transfer X of waveguide 5 and direction of an electric field Y.Therefore, in the structure of execution mode 11, the cross part of the slit of microwave radiation portion 6 is configured in from the symmetry axis of waveguide 5, is the position that the plumb line of the tubular axis P of waveguide 5 departs from.By disposing the slit of microwave radiation portion 6 in this wise, can allow microwave radiation portion 6 radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave) reliably.
In addition, in a plurality of microwave radiation portion 6 of radiation circularly polarized wave, the interval of adjacent microwave radiation portion 6 is narrow more, and the electric field between the microwave radiation portion 6 is concentrated strong more, and the loss of microwave is big more, and the efficiency of heating surface is poor more.Microwave radiation portion 6 as adjacent preferably is configured with the interval more than the 5mm.Therefore, in the structure of execution mode 11, be configured to, enlarge the interval of adjacent microwave radiation portion 6 on the Width Z of waveguide 5 as much as possible.
(execution mode 12)
Below, the microwave heating equipment of embodiments of the present invention 12 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 12 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 12, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 22 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave) in the microwave heating equipment of embodiments of the present invention 12.
As shown in figure 22, in the microwave heating equipment 1 of execution mode 12, at least on the direction Z vertical with direction of transfer X and direction of an electric field Y alignment arrangements have a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave).
In the microwave heating equipment of execution mode 12, the microwave radiation portion 6 of radiation circularly polarized wave in heating chamber 2 (left-hand polarized wave or right-handed polarized wave) makes two slits intersected with each other and form the X word shape, and the long limit that constitutes each slit is with respect to the direction of transfer X in the waveguide 5 tilt (45 degree).The structure of execution mode 12 is as follows: the slit width 2q in the microwave radiation portion 6 according in the waveguide 5 with the vertical direction Z of direction of transfer X and direction of an electric field Y on the position and different.
In two microwave radiation portions 6 shown in Figure 22, the opening portion of the microwave radiation portion 6 of rear side zone (towards direction of transfer and the upside of zone on the right side: Figure 22) forms greatlyyer than the opening portion of the microwave radiation portion 6 of front face side zone (towards direction of transfer and the downside of the zone of the side that keeps left: Figure 22).Therefore, in Figure 22, show the example that the microwave radiation amount from the opening portion of the microwave radiation portion 6 of rear side zone (towards direction of transfer and zone on the right side) is increased.
The microwave heating equipment of the execution mode 12 of Gou Chenging constitutes as mentioned above, configuration relation by changing a plurality of microwave radiation portion 6 and the slit width (aperture area) in each microwave radiation portion 6, amount of radiation that can controlled microwave.Therefore, in the microwave heating equipment of execution mode 12, can evenly and efficiently carry out microwave heating to the heating object in the heating chamber 2.
In addition, in the microwave heating equipment of execution mode 12, as long as a plurality of microwave radiation portion 6 is alignment arrangements on Width Z at least, as microwave radiation portion 6, following structure is also contained in the structure of execution mode 12: also dispose a plurality of microwave radiation portion 6 not only on Width Z, and on direction of transfer X.
In the microwave heating equipment 1 of execution mode 12, about with the relation of other design considerations, be not limited to dispose a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2.In addition, even disposed a plurality of microwave radiation portion 6 symmetrically about the central authorities in the heating chamber 2, because various parts such as heater and door glass are installed in the storehouse of microwave heating equipments such as microwave oven 1, and it also is uneven that the microwave under therefore most situation in the heating chamber 2 distributes.
Therefore, in the microwave heating equipment of execution mode 12, not only change the configuration of a plurality of microwave radiation portion 6, and the slit width 2q of change microwave radiation portion 6, guaranteed the uniformity that the microwaves in the heating chamber 2 distribute thus.
In general, in the microwave radiation portion 6 that forms by two slits intersections,, reduce the aperture area of microwave radiation portion 6, make the microwave amounts that are radiated in the heating chamber 2 from microwave radiation portion 6 reduce thus by shortening the width 2q of slit.
For example, when the microwave of the front face side zone in the waveguide shown in Figure 22 5 (downside of Figure 22) distributes when strong, intersect the slit width 2q of the microwave radiation portion 6 that forms by what increase rear side zone (upside of Figure 22) by two slits, increased the aperture area of the microwave radiation portion 6 in rear side zone thus.Its result has increased from the microwave radiation portion 6 in rear side zone and has been radiated microwave amount in the heating chamber 2, can guarantee the uniformity that the microwaves in the heating chamber 2 distribute.
In the structure of execution mode 12, also as explanation in the above-mentioned execution mode 2, when using waveguide 5 to transmit from microwave that the microwave generation device 4 that is made of magnetron etc. produces, by the size on the direction of an electric field Y of the frequency of the microwave that produces from the magnetron that uses and waveguide 5, limited the size of the upper and lower bound on the Width Z of waveguide 5.
In addition, condition as the shape of the microwave radiation portion 6 in the execution mode 12, as (a) that use Fig. 4 in the above-mentioned execution mode 1 is illustrated, the length (2p) of slit shown in Figure 22 (elongated opening portion) is wavelength in pipe λ g about more than 1/4 of the microwave that transmits in waveguide 5, two slits intersect in the central authorities of length direction each other, and each slit has tilted 45 ° with respect to direction of transfer X.
And the microwave radiation portion 6 that is made of two slits intersections constitutes, and the cross part of the slit of process microwave radiation portion 6 and the axle parallel with direction of transfer X are not in the position of the Electric Field Distribution symmetry that makes waveguide 5 inside.
For example, when waveguide 5 transmits microwave with the TE10 pattern, be the symmetry axis of the Electric Field Distribution in the waveguide 5 through the central authorities on the Width Z of waveguide 5 and along the tubular axis P that direction of transfer X extends.Therefore, in the structure of execution mode 5, the cross part of the slit of microwave radiation portion 6 is configured in from the symmetry axis of waveguide 5, is the position that the plumb line of the tubular axis P of waveguide 5 departs from.By disposing the slit of microwave radiation portion 6 in this wise, can allow microwave radiation portion 6 radiation circularly polarized wave reliably.
In addition, in a plurality of microwave radiation portion 6 of radiation circularly polarized wave, the interval of adjacent microwave radiation portion 6 is narrow more, and the electric field between the microwave radiation portion 6 is concentrated strong more, and the loss of microwave is big more, and the efficiency of heating surface is poor more.Microwave radiation portion 6 as adjacent preferably is configured with the interval more than the 5mm.Therefore, in the structure of execution mode 12, be configured to, enlarge the interval of adjacent microwave radiation portion 6 on the Width Z of waveguide 5 as much as possible.
The microwave heating equipment of embodiments of the present invention 12 constitutes, a plurality of microwave radiation portion 6 makes two shapes that slit is intersected with each other and long limit each slit tilts with respect to the direction of transfer X in the waveguide 5, the width 2q of slit according in the waveguide 5 with the vertical direction Z of direction of transfer X and direction of an electric field Y on the position and different.The microwave heating equipment of the execution mode 12 of Gou Chenging can evenly and efficiently carry out microwave heating to heating object like this.
(execution mode 13)
Below, the microwave heating equipment of embodiments of the present invention 13 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 13 and above-mentioned execution mode 1 is the configuration and the concrete structure of microwave radiation portion, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 13, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 23 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave) in the microwave heating equipment of embodiments of the present invention 13.
As shown in figure 23, in the microwave heating equipment 1 of execution mode 13, on the upper surface (with heating chamber 2 facing surfaces) of waveguide 5, at least on the direction Z vertical with direction of transfer X and direction of an electric field Y alignment arrangements have a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.
In the microwave heating equipment 1 of execution mode 13, the microwave radiation portion 6 of radiation circularly polarized wave makes two slits intersected with each other and form the X word shape in heating chamber 2, and the long limit that constitutes each slit is with respect to the direction of transfer X in the waveguide 5 tilt (45 degree).The microwave heating equipment 1 of execution mode 13 has carried out R chamfer machining or C chamfer machining to the bight of cross section 12 in microwave radiation portion 6 in shape.In addition, among Figure 14 in front, show the R chamfer machining that the bight of the cross section 12 of the slit in the microwave radiation portion 6 is implemented or the illustration of C chamfer machining.In Figure 14,, need only cross section 12 enforcements any one processing at least to the slit of microwave radiation portion 6 though show the example of having implemented R chamfer machining and C chamfer machining both sides.
In the microwave heating equipment 1 of the execution mode 13 that constitutes as mentioned above, can reduce the microwave loss in the microwave radiation portion 6, can carry out microwave heating to heating object efficiently.
Because microwave has the character in the segment set of the point of bight or end, therefore intersected with each other by two slits and in the microwave radiation portion 6 that constitutes, have in its cross part office under the situation of sharp shape, can produce the electric field that causes by microwave and concentrate the problem that exists the efficiency of heating surface to reduce.
Therefore, in the microwave heating equipment 1 of execution mode 13, to intersected with each other by two slits and R chamfer machining or C chamfer machining are implemented in bight cross section 12 in the microwave radiation portion 6 that constitutes, thereby having alleviated electric field concentrates, and has improved the efficiency of heating surface.
(execution mode 14)
Below, the microwave heating equipment of embodiments of the present invention 14 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 14 and above-mentioned execution mode 1 is the structure that the configuration of microwave radiation portion is concrete, and other structures are identical with the microwave heating equipment of execution mode 1.
In the explanation of following execution mode 14, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 24 is the vertical view of waveguide 5, and it shows the microwave radiation portion 6 of the radiation circularly polarized wave (left-hand polarized wave or right-handed polarized wave) in the microwave heating equipment of embodiments of the present invention 14.
As shown in figure 24, in the microwave heating equipment 1 of execution mode 14, on the upper surface (with heating chamber 2 facing surfaces) of waveguide 5, at least the direction vertical (Width Z) with direction of transfer X and direction of an electric field Y go up alignment arrangements have a plurality of in heating chamber 2 the microwave radiation portion 6 of radiation circularly polarized wave.
In the microwave heating equipment 1 of execution mode 14, the microwave radiation portion 6 of radiation circularly polarized wave makes two slits intersected with each other and form the X word shape in heating chamber 2, and the long limit that constitutes each slit is with respect to the direction of transfer X in the waveguide 5 tilt (45 degree).Slot ends part 13 places of the microwave radiation portion 6 in execution mode 14 have implemented R chamfer machining or C chamfer machining.In addition, among Figure 14 in front, show the R chamfer machining that the end portion 13 of the slit of microwave radiation portion 6 is implemented or the illustration of C chamfer machining.In Figure 14,, need only end portion 13 enforcements any one processing at least to the slit of microwave radiation portion 6 though show the example of having implemented R chamfer machining and C chamfer machining both sides.
In the microwave heating equipment 1 of the execution mode 14 that constitutes as mentioned above, can reduce the microwave loss in the microwave radiation portion 6, can carry out microwave heating to heating object efficiently.
Microwave has the character in the segment set of the point of bight or end.Therefore,, have under the situation of corner angle shape, can produce the electric field that causes by microwave to concentrate the problem that exists the efficiency of heating surface to reduce in the end portion 13 of slit intersected with each other by two slits and in the microwave radiation portion that constitutes.
Therefore, in the microwave heating equipment 1 of execution mode 14, to intersected with each other by two slits and slot ends part 13 in the microwave radiation portion that constitutes is implemented R chamfer machining or C chamfer machining, thereby having alleviated electric field concentrates, and has improved the efficiency of heating surface.
" execution mode 15 and execution mode 16 "
At above-mentioned execution mode 1 to the microwave heating equipment of execution mode 14, following structure has been described: a plurality of microwave radiation portion 6 of radiation circularly polarized wave is configured in waveguide 5 with heating chamber 2 facing surfaces on the desired locations place, can evenly and efficiently carry out microwave heating to the heating objects in the heating chamber 2.In the microwave heating equipment of the execution mode 15 of following narration and execution mode 16, following structure is described: as the mounting portion of above-mentioned execution mode 1 to the microwave heating equipment of execution mode 14, by the unit that seals described later is set, thereby can carry out microwave heating more efficiently.
In representational microwave heating equipment in the past, the microwave heating equipment that has constitutes: rotable antenna is arrived in the microwave transmission that produces, by rotable antenna stirring microwave on one side irradiate microwaves into heating chamber on one side.
Figure 30 shows the microwave heating equipment in the past of record in the TOHKEMY 2007-225186 communique (patent documentation 3).Microwave heating equipment in the past shown in Figure 30 has: heating chamber 21, and it takes in heating object; Magnetron 22, it produces microwave; Waveguide 23, it transmits microwave; Rotable antenna 24, it is used to irradiate microwaves in the heating chamber 21; And hush panel 25, it is arranged between heating chamber 21 and the rotable antenna 24.
The microwave that is produced by magnetron 22 transmits in waveguide 23, and the microwave that sends is coupled on rotable antenna 24, is radiated in the heating chamber 21 by rotable antenna 24.At this moment,, make rotable antenna 24 rotations, realized the homogenizing that the microwave in the heating chamber 21 distributes by rotary driving sources such as motors in order to prevent the heating inequality of heating object.
In heating chamber 21, be arranged on hush panel 25 between heating chamber 21 and the rotable antenna 24 and be stable mounting, and prevent that the gas (steam, oil) that produces from heating object is provided with the pollution and the corrosion of rotable antenna 24 and waveguide 23 in order to ensure heating object.From the microwave penetrating hush panel 25 of rotable antenna 24 and be radiated in the heating chamber 21.As hush panel 25, sheet materials such as pottery or glass have been used.
In the microwave heating equipment in the past that constitutes like this, for the microwave that in heating chamber 21, distributes equably, by rotable antenna 24 stir microwave, on one side to heating chamber 21 in radiation on one side.Therefore, needs increase the microwave penetrating portion zone in the hush panel 25 that is arranged between heating chamber 21 and the rotable antenna 24.And the hush panel 25 that microwave saw through is the structures that absorb microwave energy in a large number.
Its result, big from the energy loss of the microwave of rotable antenna 24 radiation, the microwave energy that is radiated in the heating chamber reduces efficiency of heating surface variation.
In addition, in the structure of in the past microwave heating equipment,, need the mechanism that uses rotable antenna 24 and be used to make these rotable antenna 24 rotations in order to realize the even distribution of the microwave in the heating chamber 21.Therefore, need the driving space of rotable antenna 24, must guarantee the space that is provided with as the motor of the mechanism that makes rotable antenna 24 rotation etc.Like this, in microwave heating equipment in the past as shown in figure 30, include the factor of a lot of obstruction miniaturizations.
In addition, stably rotate in order to make rotable antenna 24, rotable antenna 24 need be arranged on the top or the bottom of heating chamber, structure is very restricted.
Below the structure of Shuo Ming embodiments of the present invention 15 and execution mode 16 provides microwave heating equipment as described below: have in the position of expectation a plurality of in heating chamber the microwave radiation portion of radiation circularly polarized wave, thereby the mechanism that does not need rotable antenna and be used to make rotable antenna to rotate, can realize uniform microwave heating to heating object, and utilize as the mouth-sealed portion that seals the unit and constitute mounting portion 3, significantly suppress the absorption loss water of microwave, thereby can realize the excellent efficiency of heating surface.
The microwave heating equipment of embodiments of the present invention 15 and execution mode 16 has structure as described below: little by getting as the microwave penetrating area limiting in the mouth-sealed portion of mounting portion 3, can reduce the absorption loss water of the microwave energy in the mouth-sealed portion.Its result in the microwave heating equipment of execution mode 15 and execution mode 16, can improve the efficiency of heating surface of microwave to heating object, can significantly improve energy-efficient performance.
(execution mode 15)
Below, the microwave heating equipment of embodiments of the present invention 15 is described.The microwave heating equipment of execution mode 15 and above-mentioned execution mode 1 to the difference of the microwave heating equipment of execution mode 14 is, mouth-sealed portion as the mounting portion of heating chamber has special structure, and other structure applications execution modes 1 are to the structure of the microwave heating equipment of execution mode 14.
In the explanation of following execution mode 15, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 25 is the integrally-built stereogram that illustrates as the microwave oven of the microwave heating equipment of embodiments of the present invention 15.Figure 26 is the front section view of the microwave heating equipment of execution mode 15.Figure 27 illustrates the section plan that the bottom surface sections of the heating chamber in the microwave heating equipment of execution mode 15 is graded.
In Figure 25, constitute as the microwave oven 1 of microwave heating equipment and to have heating chamber 2, door (front side wall) 7 and each wall (bottom surface, upper surface, left surface, right flank and the back side) that heating chamber 2 is used to pick and place heating objects such as food surround.
In mounting portion 3 as the bottom surface of heating chamber 2, be provided be used to make from the 6(of microwave radiation portion with reference to Figure 26) microwave penetrating and the mouth-sealed portion 10 of unit is sealed in the conduct that is radiated heating chamber 2.Mouth-sealed portion 10 constitutes by the microwave penetrating portion 8 that makes microwave penetrating with to the microwave reflection portion 9 that microwave reflects.
As Figure 26 and shown in Figure 27, below the mouth-sealed portion 10 that is disposed at heating chamber 2 bottom surfaces, be provided with: waveguide 5, the microwave that it sends that free magnetron constitutes as the microwave generation device 4 of microwave generating unit; And microwave radiation portion 6, its be arranged on waveguide 5 with mouth-sealed portion 10 facing surfaces on.Microwave radiation portion 6 is the peristomes at above-mentioned execution mode 1 reservation shape of explanation to the execution mode 14, be for the microwave radiation that will send via waveguide 5 from microwave generation device 4 in heating chamber 12 and be provided with.
Microwave penetrating portion 8 in a plurality of microwave radiation portions 6 and the mouth-sealed portion 10 relatively disposes.The microwave penetrating portion 8 that the material of microwave penetrating is formed be configured in a plurality of microwave radiation portion 6 peristome directly over, constitute peristome is included in.
Then, action and the effect as the microwave oven of the microwave heating equipment 1 of execution mode 15 that constitutes as mentioned above described.
In the heating of microwave heating equipment 1 action, at first, heating object such as mounting gratin on as the mouth-sealed portion 10 of the bottom surface heating chamber 2 in closes 7.In the air-tight state of the heating chamber 2 in microwave is enclosed in, by being used to begin to heat the scheduled operation of action, thereby start microwave generation device 4, produce microwave by control part (not shown).
The microwave that is produced transmits in waveguide 5, from being arranged on microwave radiation portion 6 radiation on the waveguide 5 as the microwave of circularly polarized wave.Microwave penetrating portion 8 from the microwave penetrating mouth-sealed portion 10 of microwave radiation portion 6 radiation, power supply (radiation) in heating chamber 2.The microwave that utilization is powered in heating chamber 2 carries out microwave heating to heating object, the cooking of carry out desired.
Circularly polarized wave is as explanation in the above-mentioned execution mode 1, widely used technology in the field of mobile communication and satellite communication.The use-case that makes as being familiar with can exemplify ETC(Electronic Toll Collection System) " electronic charging system without parking " etc.
Circularly polarized wave is the microwave that the plane of polarization of electric field rotates in time with respect to the direct of travel of electric wave, and when forming circularly polarized wave, the direction of electric field continues to change in time.Therefore, when when the microwave radiation of circularly polarized wave is in heating chamber, have following advantage: the angle of radiation that is radiated the microwave in the heating chamber continues to change, and the size of electric field strength substantial variations not in time.
But, in the microwave radiation portion of microwave radiation in heating chamber when being single,, and be difficult to this microwave distributed and control evenly owing to the influence of the directive property of the microwave of institute's radiation etc. causes microwave skewness in the heating chamber.Like this, when being single, near the quilt of microwave radiation portion is concentrated heating in microwave radiation portion, therefore exists to produce the uneven problem of heating in the heating object.
As above-mentioned execution mode 1 to the execution mode 14 narration like that, the microwave radiation portion 6 of the microwave by a plurality of radiation circularly polarized waves are set can solve the problem of the above-mentioned heating inequality of generation.That is, by a plurality of microwave radiation portion 6 is set, can the radiation of dispersion microwave in heating chamber 2, therefore compare with single microwave radiation peristome, can alleviate microwave and concentrate, can heat heating object equably.
And, in the microwave heating equipment in the past of modes as shown in figure 30, by rotable antenna 24 microwave radiations, because of the interference between the microwave that is radiated the microwave in the heating chamber 21 and is reflected by the inwall of heating chamber 21 produces standing wave.Therefore, can in heating object, produce the heating inequality on the principle.
In microwave heating equipment of the present invention, owing to be to utilize a plurality of microwave radiation portion 6 radiation circular polarization wave structures, therefore on principle, become the structure that can not produce the standing wave that the interference effect by microwave causes.Therefore, microwave heating equipment of the present invention is the power that can avoid the microwave energy that caused by standing wave in the heating chamber, the structure that can heat heating object more equably.
In the microwave heating equipment of execution mode 15, as the bottom surface of heating chamber 2, be provided with mouth-sealed portion 10, the microwave penetrating portion 8 in the mouth-sealed portion 10 is made of the material that makes microwave penetrating.But in microwave penetrating portion 8, material self all can absorb ripple slightly, is difficult to accomplish to make microwave penetrating portion 8 to see through microwave with 100% ratio.
Therefore, when the material with microwave penetrating portion 8 formed mouth-sealed portion 10 whole of the bottom surface that constitutes heating chamber 2, the microwave absorbing amount of material self increased, and reduced efficiency of heating surface variation being pined for effective energy adding of heating object.
In the microwave heating equipment of embodiments of the present invention 15,, constitute the microwave penetrating portion 8 that reduces as far as possible in the mouth-sealed portion 10 as the microwave penetrating zone in order to reduce the energy loss of microwave as far as possible.In the microwave heating equipment of execution mode 15, mouth-sealed portion 10 is made of microwave penetrating portion 8 and microwave reflection portion 9, and microwave penetrating portion 8 only is arranged on the position relative with microwave radiation portion 6.
In the microwave heating equipment of the execution mode 15 that constitutes as mentioned above,, therefore suppressed the absorption of the microwave in the mouth-sealed portion 10 owing to can constitute the zone that has reduced to make in the mouth-sealed portion 10 microwave penetrating.Its result in the microwave heating equipment of execution mode 15, can reduce the loss amount that is radiated the microwave energy in the heating chamber 2, can improve the efficiency of heating surface of microwave to heating object.
In addition, as the shape of the microwave penetrating portion 8 in microwave penetrating zone than the little situation of the shape of microwave radiation portion 6 under, exist from the microwave of microwave radiation portion 6 radiation and the microwave reflection portion 9 of mouth-sealed portion 10, take place to reflect and the problem of close echo conduit 5.In this wise under the situation of close echo conduit 5, microwave turns back to microwave generation device 4 as reflected wave at microwave, and it is big that energy loss becomes.Therefore, preferably, microwave penetrating portion 8 has to the structure of the peristome of major general's microwave radiation portion 6 in being included in, and becomes bigger than the peristome of microwave radiation portion 6 at least shape.
In the microwave heating equipment of the execution mode 15 that constitutes as mentioned above, the zone of microwave penetrating is reduced, with other zones as reflector space.Therefore, the loss of the microwave energy that produces because of the microwave absorbing in the microwave penetrating portion 8 of mouth-sealed portion 10 significantly reduces.Its result, the structure according to the microwave heating equipment of execution mode 15 can improve the efficiency of heating surface of microwave to heating object, can realize excellent energy-efficient performance.
In addition, in the microwave heating equipment of execution mode 15, owing to be, therefore do not need rotable antenna and be used to drive the motor of rotable antenna the microwave radiation of the circularly polarized wave mode in the heating chamber.Its result in the microwave heating equipment of execution mode 15, does not need to be provided with the space that is provided with of the driving space of rotable antenna and rotable antenna and driving mechanism thereof etc., can realize the miniaturization of microwave heating equipment.And the microwave heating equipment of miniaturization has played the excellent effect that the space is set that can reduce in kitchen etc.
In addition, as the material of microwave penetrating portion 8, preferably the loss of microwave absorbing less and the material with mechanical strength and durability for example is preferably and comprises silica, aluminium oxide, zirconia, lithia at interior glass ceramics.
In addition, do not possess baking box function and baking function or the cook temperature in the heating chamber is designed under the situation below 250 ℃ at microwave heating equipment, can also use the plastics that lack than above-mentioned glass ceramics with the microwave absorbing loss is the material of principal component.In this case, particularly preferably be the high engineering plastics of thermal endurance.
As mentioned above, in the microwave heating equipment of execution mode 15, mouth-sealed portion 10 is made of microwave penetrating portion 8 and microwave reflection portion 9.Like this, owing in mouth-sealed portion 10, be provided with the microwave reflection portion 9 of function, therefore, be not heated that indoor heating object absorbs and the microwave of reflection reflects in microwave reflection portion 9, can shine heating object once more with microwave reflection.
As mentioned above, in the microwave heating equipment of execution mode 15,, therefore can further improve the efficiency of heating surface of microwave, further improve energy-efficient performance heating object owing to be provided with microwave reflection portion 9.
In addition,,, the reflection characteristic of microwave can be further improved, therefore the efficiency of heating surface of microwave can be further improved heating object by using metal material about microwave reflection portion 9.
As microwave reflection portion 9, can also be applied in that metallic surface formed can be owing to inductive loss, magnetic loss etc. absorbs the cover layer of microwave, the reflecting part of for example fluorine coating.
In addition, in the microwave heating equipment of execution mode shown in Figure 27 15, although understand the example that is provided with 6 microwave radiation portions 6, but unqualified to the quantity of microwave radiation portion 6 in the structure of execution mode 15, can suitably set according to the kind of the size of the heating chamber in the microwave heating equipment, microwave electric power, cooking object etc.
In addition, in the microwave heating equipment of execution mode shown in Figure 27 15, though the shape of microwave radiation portion 6 is expressed as circle, as the shape of microwave radiation portion 6, as above-mentioned illustrated in fig. 4, can use different shape.The shape of microwave radiation portion 6 can be according to parts interpolation in the size of microwave heating equipment, shape, the heating chamber etc. and is suitably set, distribute in order to obtain uniform heating, can from circular, shapes such as Elliptical is circular, quadrangle, X-shaped, Y shape, select and use.
(execution mode 16)
Below, the microwave heating equipment of embodiments of the present invention 16 is described.The difference of the microwave heating equipment of the microwave heating equipment of execution mode 16 and above-mentioned execution mode 15 is the structure as the mouth-sealed portion of the mounting portion in the heating chamber.
In the explanation of following execution mode 16, to having and the inscape identical functions of the microwave heating equipment of execution mode 1, the identical symbol of inscape mark of structure, it describes the explanation of application implementation mode 1 in detail.
Figure 28 is the front section view of the microwave heating equipment of embodiments of the present invention 16.Figure 29 illustrates the section plan that the bottom surface sections of the heating chamber in the microwave heating equipment of execution mode 16 is graded.
In the microwave heating equipment of execution mode 16, cede territory to dispose microwave penetrating portion 8 as in the mouth-sealed portion 10 of mounting portion 3 according to the shape branch of microwave radiation portion 6.
As Figure 28 and shown in Figure 29, as the microwave penetrating portion 8 in the mouth-sealed portion 10 of mounting portion 3 with the corresponding mode of quantity of a plurality of microwave radiation portion 6, be divided into equal number, become shape corresponding shape with microwave radiation portion 6.In the microwave heating equipment of execution mode 16, each microwave penetrating portion 8 relatively disposes with each microwave radiation portion 6, is constructed such that the microwave as circularly polarized wave of institute's radiation sees through from microwave penetrating portion 8.
Transmit in waveguide 5 from microwave, carry out radiation with circularly polarized wave from microwave radiation portion 6 as the microwave generation device 4 of microwave generating unit.The microwave penetrating of the circularly polarized wave of institute's radiation has the microwave penetrating portion 8 with microwave radiation portion 6 corresponding shape, is radiated in the heating chamber 2.
By making microwave penetrating portion 8 become 6 corresponding shape, can make the Min. that the zone necessitates that sees through of microwave penetrating portion 8 in the mouth-sealed portion 10 with microwave radiation portion.Its result in the microwave heating equipment of execution mode 16, because the absorption of the microwave in the microwave penetrating portion 8 is few, therefore can improve the power supplying efficiency of microwave energy to heating chamber 2, can further improve the efficiency of heating surface of heating object.
In addition, about the shape of microwave penetrating portion 8,, be not particularly limited though be preferably peristome shape corresponding shape with microwave radiation portion 6.About microwave penetrating portion 8, also can use the microwave penetrating portion identical shaped with the shape of microwave radiation portion 6, at this moment, the peristome that can be configured to microwave radiation portion 6 overlaps each other with the shape of microwave penetrating portion 8.
In addition, about microwave penetrating portion 8, can with the shape of the microwave radiation portion 6 of the microwave of radiation circularly polarized wave irrespectively, use circular microwave penetrating portion.At this moment, preferably, in the peristome of microwave penetrating portion 8 to major general's microwave radiation portion 6 is included in, and become the identical or slightly long circle of long edge lengths of for example slit in diameter and the microwave radiation portion 6.
In microwave heating equipment of the present invention and since have a plurality of in heating chamber the microwave radiation portion of radiation circularly polarized wave, thereby can realize even and high efficiency microwave heating to heating object.Its result, in microwave heating equipment of the present invention, need not to be provided with the mechanism that makes the antenna rotation, the mechanism that makes the mounting table rotation and phase shifter etc., can evenly and efficiently carry out microwave heating to heating object, cost that can implement device reduces, the miniaturization of power supply and the raising of reliability.
Utilizability on the industry
In microwave heating equipment of the present invention, can be to heating object irradiating microwaves equably, therefore can in the device that adds hot working or sterilization etc. etc., effectively utilize, and can be applied to utilize microwave heating equipment in the various devices such as heater, garbage disposer, semiconductor-fabricating device of induction heating.
Label declaration
1 microwave heating equipment
2 heating chambers
3 mounting portions
4 microwave generation devices
5 waveguides
6 microwave radiation portions
7
8 microwave penetrating portions
9 microwave reflection portions
10 mouth-sealed portions

Claims (19)

1. microwave heating equipment, this microwave heating equipment has:
Heating chamber, it takes in heating object;
Mounting portion, it constitutes the bottom surface of described heating chamber, takes in the mounting heating object in described heating chamber;
The microwave generating unit, it produces described microwave;
Waveguide portion, it sends the microwave from described microwave generating unit; And
A plurality of microwave radiation portion, its be arranged on described waveguide portion with described heating chamber facing surfaces on, radiation circularly polarized wave in heating chamber.
2. microwave heating equipment according to claim 1, wherein,
Described a plurality of microwave radiation portion be configured in described mounting portion under.
3. microwave heating equipment according to claim 2, wherein,
This microwave heating equipment constitutes, and described a plurality of microwave radiation portion is the microwave of the roughly the same amount of radiation of radiation respectively.
4. microwave heating equipment according to claim 3, wherein,
Described a plurality of microwave radiation portion is alignment arrangements on the direction of transfer in described waveguide portion at least.
5. microwave heating equipment according to claim 3, wherein,
Described a plurality of microwave radiation portion is alignment arrangements on the direction vertical with direction of transfer and direction of an electric field in described waveguide portion at least.
6. according to claim 4 or 5 described microwave heating equipments, wherein,
The described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion.
7. according to claim 4 or 5 described microwave heating equipments, wherein,
The described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion, the long edge lengths that constitutes described slit are according to the position on the direction of transfer in the described waveguide portion and difference.
8. according to claim 4 or 5 described microwave heating equipments, wherein,
The described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion, the long edge lengths that constitutes described slit according in the described waveguide portion with the vertical direction of direction of transfer and direction of an electric field on the position and different.
9. according to claim 4 or 5 described microwave heating equipments, wherein,
The described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion, the width that constitutes described slit are according to the position on the direction of transfer in the described waveguide portion and difference.
10. according to claim 4 or 5 described microwave heating equipments, wherein,
The described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion, the width that constitutes described slit according in the described waveguide portion with the vertical direction of direction of transfer and direction of an electric field on the position and different.
11. according to claim 4 or 5 described microwave heating equipments, wherein,
The described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion has been implemented R chamfer machining or C chamfer machining to the cross section of described slit.
12. according to claim 4 or 5 described microwave heating equipments, wherein,
The described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion has been implemented R chamfer machining or C chamfer machining to the end portion of described slit.
13. according to claim 4 or 5 described microwave heating equipments, wherein,
The described a plurality of microwave radiation portion shape that to be the long limit that makes intersected with each other and each slit of two slits tilt with respect to the direction of transfer in the described waveguide portion,
Position about the cross section of described slit, have following shape: from the long microwave radiation portion of the transmitting range that the position is set of described microwave generating unit with compare from the short microwave radiation portion of the transmitting range that the position is set of described microwave generating unit, from the microwave radiation rate height of described waveguide portion to described heating chamber.
14. microwave heating equipment according to claim 3, wherein,
The mounting portion of taking in the mounting heating object in described heating chamber has the microwave penetrating portion of the microwave penetrating of making, and described microwave penetrating portion and described microwave radiation portion relatively dispose, described microwave penetrating portion be arranged on described microwave radiation portion at least directly over.
15. microwave heating equipment according to claim 14, wherein,
Described microwave penetrating portion has the corresponding shape with described microwave radiation portion.
16. microwave heating equipment according to claim 15, wherein,
Described mounting portion constitutes the microwave reflection portion with described microwave penetrating portion and microwave reflection.
17. microwave heating equipment according to claim 16, wherein,
Described microwave penetrating portion is made of the glass ceramics that comprises any one material at least in silica, aluminium oxide, zirconia or the lithia.
18. microwave heating equipment according to claim 16, wherein,
Described microwave penetrating portion is that the material of plastics constitutes by principal component.
19. microwave heating equipment according to claim 16, wherein,
Described microwave reflection portion is made of metal material.
CN201180057141.1A 2010-11-29 2011-11-22 Microwave heating equipment Active CN103229593B (en)

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JP2011081448 2011-04-01
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PCT/JP2011/006487 WO2012073451A1 (en) 2010-11-29 2011-11-22 Microwave heater

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