CN103687122B - Microwave heating equipment - Google Patents

Abstract

The present invention provides microwave heating equipment, it is possible to be uniformly heated up the heating object in heating chamber in the case of not using drive mechanism.The position that the antinode of standing wave that is arranged in the 1st microwave radiation portion (105a, 105d) in multiple microwave radiation portions (105a, 105b, 105c, 105d) and produce in waveguide (104) is relative, is arranged in the 2nd microwave radiation portion (105b, 105c) adjacent with the 1st microwave radiation portion (105a, 105d) and apart exceedes the 1/4 of wavelength in pipe and the position of distance of 1/2 less than wavelength in pipe on the direction of transfer of waveguide (104) with the 1st microwave radiation portion (105a, 105d).

Description

Microwave heating equipment

Technical field

The present invention relates to heating object radiated microwaves is carried out the microwave heating equipment such as microwave oven of sensing heating.

Background technology

Microwave oven as representational microwave heating equipment will be single from producing as representational microwave via waveguide The microwave of the magnetron radiation of unit provides the inside of metal heating chamber, is heated being positioned over heating chamber Thing carries out sensing heating.Therefore, when the magnetic distribution of the microwave of heating chamber is uneven, it is impossible to heated Thing uniformly heats.

Accordingly, as the method that heating object is uniformly heated, typically adopt with the following method: utilize and make load The structure of putting the worktable rotary of heating object and make heating object self rotate or heating object is fixed and makes to put Penetrate the arbitrary drive mechanism such as structure that the antenna of microwave rotates and change the direction of the microwave to heating object radiation, Heat, thus heating object is realized uniform heating.

On the other hand, in order to make simple in construction, expect the side uniformly heated in the case of not there is drive mechanism Method, thus the method proposing the circularly polarized wave utilizing the plane of polarization of electric field to rotate according to the time.Sensing heating is originally It is namely based on the principle heating object with dielectric loss heated by the electric field of microwave and carries out, therefore Thinking, the circularly polarized wave using electric field to rotate is effective for the homogenization heated.

Such as, as the production method of concrete circularly polarized wave, as shown in figure 21, in U.S. Patent No. 4301347 In number description (patent documentation 1), disclose the circularly polarized wave opening employing the X font intersected on waveguide 1 The structure of 2.Additionally, as shown in figure 22, in No. 3510523 publications of Japanese Patent Publication No. (patent documentation 2), public Open the opening 3,4 of 2 rectangular slits shapes the most extended on waveguide 1 with that This relatively and from mode carry out the structure that configures.Further, as shown in figure 23, at Japanese Unexamined Patent Publication 2005-235772 Number publication (patent documentation 3) discloses to be formed in the planar section of the paster antenna 5 being combined with waveguide 1 and cuts Mouth 6 produces the structure of circularly polarized wave.

Although additionally, unrelated with circularly polarized wave, but as shown in figure 24, at Japanese Unexamined Patent Publication 10-284246 publication In (patent documentation 4), disclose according to wavelength 1/4 be spaced multiple rectangular slits 140,141, 142,143, with the structure of phase place radiated microwaves different from each other.

Patent documentation 1: No. 4301347 description of U.S. Patent No.

Patent documentation 2: No. 3510523 publications of Japanese Patent Publication No.

Patent documentation 3: Japanese Unexamined Patent Publication 2005-235772 publication

Patent documentation 4: Japanese Unexamined Patent Publication 10-284246 publication

But, about the above-mentioned conventional microwave heating equipment that make use of circularly polarized wave, in patent documentation 1～3, Although all make use of circularly polarized wave, but all there is the even results being not reaching to use this degree of drive mechanism Problem.In any 1 document of patent documentation 1～3, the most simply merely stated that and only there is driving in the past The structure of mechanism is compared, and can be realized the skill of homogenization further by the cooperative effect of circularly polarized wave and drive mechanism Art.Specifically, in patent documentation 1, the end at waveguide 1 has and is referred to as the phase shifter as shown in figure 21 The rotary body of 7, has the turntable (not shown) for making heating object rotate in patent documentation 2, at patent literary composition Offer and in 3, recorded the structure also making paster antenna 5 rotate in addition to turntable 8 and to be used as blender.At patent documentation 1～ In any 1 document of 3, if being all silent on using circularly polarized wave, need not the situation of drive mechanism.This is Because, if being not provided with drive mechanism merely with the radiation of circularly polarized wave, then with the general knot with drive mechanism Structure (structure such as making the worktable rotary of mounting heating object or the structure etc. making antenna rotate) is compared, micro- The stirring of ripple is insufficient, and therefore uniformity is poor.

Summary of the invention

It is an object of the invention to solve the problem in above-mentioned conventional microwave heating equipment, it is provided that one can not make With microwave heating equipment heating object uniformly heated in the case of drive mechanism.

In order to solve the problem in above-mentioned conventional microwave heating equipment, the microwave heating equipment of the present invention has:

The heating chamber of storage heating object；

Produce the microwave generating unit of microwave；

Transmit the waveguide of microwave；And

From described waveguide to multiple microwave radiation portions of radiated microwaves in described heating chamber,

Standing wave is produced in described waveguide,

The 1st microwave radiation portion in the plurality of microwave radiation portion is configured in the position relative with the antinode of described standing wave Put place,

The 2nd microwave radiation portion adjacent with described 1st microwave radiation portion is configured in and exists with described 1st microwave radiation portion The position of the distance of apart exceed wavelength in pipe on the direction of transfer of described waveguide 1/4 and be less than wavelength in pipe 1/2 Put place.

Invention effect

The microwave heating equipment of the present invention can provide and can enter heating object in the case of not using drive mechanism The microwave heating equipment of row uniformly heating.

Accompanying drawing explanation

Fig. 1 is the integrally-built axonometric chart of the microwave heating equipment illustrating embodiments of the present invention 1.

Fig. 2 schematically shows the major part in the microwave heating equipment of embodiment 1, and (a) is top plan view, B () is main pseudosection.

Fig. 3 is the axonometric chart of the waveguide in the microwave heating equipment that embodiment 1 is described.

Fig. 4 is the terminal part emulation knot as radiation border of the waveguide of the microwave heating equipment using embodiment 1 Really, (a) is the plane picture figure of phantom, and (b) is the top plan view of the electric-field intensity distribution in heating chamber.

Fig. 5 is to illustrate that the standing wave being provided with drum on the waveguide in the microwave heating equipment of embodiment 1 is steady Determine the axonometric chart of the structure in portion.

Fig. 6 is to illustrate that being provided with hemispherical standing wave on the waveguide in the microwave heating equipment of embodiment 1 stablizes The profile of the structure in portion.

Fig. 7 schematically shows the major part in the microwave heating equipment of comparative example, and (a) is top plan view, (b) It it is main pseudosection.

Fig. 8 is the heat characteristic between microwave heating equipment and the microwave heating equipment of comparative example that embodiment 1 is described The explanatory diagram of difference.

Fig. 9 is that the difference that the distance between the opening adjacent one another are in the microwave heating equipment by embodiment 1 is described is drawn The figure of the difference of the magnetic distribution risen.

Figure 10 schematically shows the major part in the microwave heating equipment of embodiments of the present invention 2, and (a) is to bow Pseudosection, (b) is main pseudosection.

Figure 11 is microwave radiation portion, standing wave and the ripple in the microwave heating equipment that embodiments of the present invention 3 are described The figure of the relation between catheter wall electric current.

Figure 12 be the microwave radiation portion in the microwave heating equipment that comparative example is described, standing wave and waveguide tube wall electric current it Between the figure of relation.

Figure 13 is to illustrate that, in the microwave heating equipment of embodiment 3, the central part in bottom of heating chamber has loaded quilt The figure of the relation between microwave radiation portion, standing wave and waveguide tube wall electric current during heating thing.

Figure 14 is microwave radiation portion, standing wave and the ripple in the microwave heating equipment that embodiments of the present invention 4 are described The figure of the relation between catheter wall electric current.

Figure 15 is the failure of current effective width illustrating to be caused by the width difference of 2 elongated holes constituting microwave radiation portion The figure of difference.

Figure 16 is the configuration space in the microwave radiation portion in the microwave heating equipment that embodiments of the present invention 5 are described Figure.

Figure 17 is to be shown in the microwave heating equipment of embodiment 5, at the axis of symmetry of the bottom relative to heating chamber The figure of the group of 2 openings of configuration on the direction tilted.

Figure 18 is the figure of the principle that directional coupler is described.

Figure 19 is the figure of the principle that directional coupler is described.

Figure 20 is the schematic diagram of the opening shape in the microwave heating equipment that embodiments of the present invention 6 are described.

Figure 21 is that the opening utilizing X font is to produce the structure chart of the conventional microwave heating equipment of circularly polarized wave.

Figure 22 is to utilize orthogonal 2 rectangular slits to produce the conventional microwave heating equipment of circularly polarized wave Structure chart.

Figure 23 is the structure chart of the conventional microwave heating equipment utilizing paster antenna to produce circularly polarized wave.

Figure 24 is the signal that the position relationship between the waveguide in conventional microwave heating equipment and multiple elongated hole is described Figure.

Label declaration

101 microwave ovens (microwave heating equipment)

102,128,202 heating chamber

103,201 magnetrons (microwave generating unit)

104,130,203,306,419 waveguide

105a the first opening (microwave radiation portion)

105b the second opening (microwave radiation portion)

105c the 3rd opening (microwave radiation portion)

105d the 4th opening (microwave radiation portion)

108,211,421,901 pipe axle

111,131,212 terminal part

112a the first standing wave stabilizers

112b the second standing wave stabilizers

112c the 3rd standing wave stabilizers

129、139a、139b、204、205、206、207、301、411、412、413、414、415、416、 417 openings (microwave radiation portion)

134,135,136,213 standing wave stabilizers

302 heating objects

Detailed description of the invention

The microwave heating equipment of the present invention has: the heating chamber of storage heating object；Produce the microwave generating unit of microwave； Transmit the waveguide of microwave；And from described waveguide to multiple microwave radiation portions of radiated microwaves in described heating chamber, Producing standing wave in described waveguide, the 1st microwave radiation portion in the plurality of microwave radiation portion is configured in described The position that the antinode of standing wave is relative, the 2nd microwave radiation portion adjacent with described 1st microwave radiation portion be configured in Described 1st microwave radiation portion apart exceedes the 1/4 of wavelength in pipe and less than in pipe on the direction of transfer of described waveguide The position of the distance of the 1/2 of wavelength.

In microwave heating equipment configured as described above, the standing wave produced in waveguide is on the direction of transfer of waveguide The antinode position of peak swing (produce) is repeat and node (is nearly free from amplitude every the 1/2 of wavelength in pipe Position).Therefore, when compare in standing wave at a distance of wavelength in pipe 1/2 two at time, become create amplitude identical and The opposite phase relationship of rightabout ripple.In the microwave heating equipment with said structure, owing to the 1st microwave is put The portion of penetrating is arranged in the position relative with the antinode of standing wave, and the 2nd microwave radiation portion is arranged in the 1st microwave radiation portion apart The position of the distance of exceed wavelength in pipe 1/4 and be less than wavelength in pipe 1/2, therefore, with the 1st microwave radiation Standing wave part and the standing wave part relative with the 2nd microwave radiation portion that portion is relative will not become opposite phase relationship.Its As a result, it is possible to suppression from the 1st microwave radiation portion radiation microwave with from and the 1st microwave radiation portion adjacent the 2nd The situation (interference) that the microwave of microwave radiation portion radiation is cancelled out each other.Therefore, it is possible in the feelings not using drive mechanism Under condition, the heating object in heating chamber is uniformly heated up.

It addition, in order to the 1st microwave radiation portion being arranged in the position relative with the antinode of standing wave, such as, as long as by 1 microwave radiation portion is arranged in and is configured at the terminal part phase of side away from described microwave generating unit in described waveguide The position of the distance of the odd-multiple of 1/4 away from described wavelength in pipe.Owing to the node of standing wave must be positioned at waveguide Terminal part, therefore the antinode of standing wave be positioned at terminal part at a distance of the 1/4 of wavelength in pipe the position of distance of odd-multiple Place.

It is further preferred, that in the plurality of microwave radiation portion, described 1st microwave radiation portion is configured to lean on most Nearly described terminal part.According to this structure, it is possible to make the position (waveform) of the standing wave in waveguide stablize.

It is further preferred, that the plurality of microwave radiation portion on described direction of transfer with between the 1/3 of wavelength in pipe Every and configure.According to this structure, the standing wave part relative with microwave radiation portion adjacent one another are is all without becoming mutually anti-phase The relation (interval of the odd-multiple of the 1/2 of wavelength in pipe) of position.It is as a result, it is possible to suppression is from microwave adjacent one another are The situation (interference) that the microwave of radioactive department radiation is cancelled out each other.Therefore, it is possible in the case of not using drive mechanism Heating object in heating chamber is uniformly heated up.

It addition, it is said that in general, when the quantity in microwave radiation portion increases, the microwave in waveguide easily emits to heating Indoor.Thus, when microwave emits in heating chamber in order, it is difficult to maintain the standing wave in waveguide, the shape of standing wave State is unstable.Its result, the phase place of the microwave relative with each microwave radiation portion is moved and amplitude also changes. Therefore, the standing wave of the position that the microwave heating equipment of the present invention preferably has the standing wave in stablizing described waveguide is steady Determine portion.According to this structure, by having standing wave stabilizers, it is possible to the disorder of suppression standing wave so that there is desired shaking Width is relative with each microwave radiation portion with the standing wave part of phase place.It is as a result, it is possible to suppress more reliably to put from the 1st microwave The situation (interference) that the microwave penetrating portion's radiation and the microwave radiated from the 2nd microwave radiation portion are cancelled out each other.Therefore, In the case of not using drive mechanism, the heating object in heating chamber can be uniformly heated up.

It is further preferred, that described standing wave stabilizers is configured to produce the node of standing wave in described waveguide, and Described standing wave stabilizers be configured at the terminal part of described waveguide on described direction of transfer at a distance of described wavelength in pipe 1/2 the position of distance of integral multiple.According to this structure, it is possible to from the terminal part of waveguide, in every pipe The integral multiple of the 1/2 of wavelength more reliably forms the node of standing wave, the disorder of suppression standing wave, it is possible to make have the phase The amplitude hoped is relative with each microwave radiation portion with the standing wave part of phase place.It is as a result, it is possible to suppress more reliably from the 1st The situation (interference) that the microwave of microwave radiation portion radiation and the microwave from the radiation of the 2nd microwave radiation portion are cancelled out each other. Therefore, it is possible to the heating object in heating chamber is uniformly heated up in the case of not using drive mechanism.

It is further preferred, that on described direction of transfer with the 1/2 of described wavelength in pipe the interval configuration of integral multiple There is multiple described standing wave stabilizers.According to this structure, it is possible to from the terminal part of waveguide, every wavelength in pipe The integral multiple of 1/2 more reliably forms the node of standing wave, the disorder of suppression standing wave, it is possible to make have desired shaking Width is relative with each microwave radiation portion with the standing wave part of phase place.It is as a result, it is possible to suppress more reliably to put from the 1st microwave The situation (interference) that the microwave penetrating portion's radiation and the microwave radiated from the 2nd microwave radiation portion are cancelled out each other.Therefore, In the case of not using drive mechanism, the heating object in heating chamber can be uniformly heated up.

It is further preferred, that multiple microwave radiation portions are made up of opening respectively, not with described when described opening is to overlook The mode that the central shaft of the width of waveguide intersects is formed.In the most common TE10 pattern, at waveguide The center of width, electric field is maximum, and at the two ends of waveguide, electric field is 0.Assuming with the width crossing waveguide When the mode of degree direction central shaft is provided with the opening as microwave radiation portion, this opening has crossed the point that electric field is maximum. Now, it may occur however that the quantitative change of the microwave radiated from other openings from 1 opening substantial amounts of microwave of radiation is lacked, There is the situation of deviation in the amount of the microwave radiated from each opening.In contrast, by with not with the width side of waveguide The mode intersected to central shaft forms each opening, it is possible to make the amount of microwave radiated from each opening uniform.Therefore, In the case of not using drive mechanism, the heating object in heating chamber can be uniformly heated up.

It is further preferred, that the plurality of microwave radiation portion is configured at the both sides of the described axis of centres symmetrically when overlooking. According to this structure, not only on the direction of transfer of waveguide, and it is also configured with multiple on the width of waveguide Opening, therefore, it is possible to configure more opening.It addition, in the most common TE10 pattern, at the width of waveguide The center in direction, electric field is maximum, and at the two ends of the width of waveguide, electric field is 0.That is, electric field have about The characteristic substantially symmetrical about its central axis of the width of waveguide.Therefore, the most so by opening relative to the width of waveguide The central shaft arrangement in degree direction is when both sides, and each opening easily radiates the microwave of isodose.Therefore, according to above-mentioned knot Structure, all has multiple openings of the microwave that can radiate isodose with on the width of waveguide in the transmission direction, Can in heating chamber radiated microwaves on a large scale, therefore, it is possible to heating chamber in the case of not using drive mechanism Interior heating object is uniformly heated up.

It is further preferred, that described microwave radiation portion is made up of the opening shape radiating circularly polarized wave.According to this structure, Produce the electric field rotated in the distinctive 360 degree of omniranges of circularly polarized wave centered by microwave radiation portion, from microwave radiation Central vortex ground radiated microwaves in heating chamber in portion, it is possible to circumferencial direction is uniformly heated up.It is as a result, it is possible to right The entirety of heating chamber radiated microwaves equably, it is possible to being heated in heating chamber in the case of not using drive mechanism Thing is uniformly heated up.

It is further preferred, that the opening of X word shape that described microwave radiation portion is intersected by 2 elongated holes is constituted.Root According to this structure, it is possible to reliably radiate circularly polarized wave from waveguide with simple structure.

Hereinafter, the preferred implementation of the microwave heating equipment of the present invention it is explained with reference to.Although it addition, with Microwave oven is illustrated by the microwave heating equipment of lower embodiment, but microwave oven simply illustrates, the microwave of the present invention Heater is not limited to microwave oven, also comprises heater, garbage disposer or the quasiconductor that make use of sensing heating Manufacture the microwave heating equipments such as device.Additionally, this invention is not limited to the concrete structure of implementation below, based on equally The structure of technological thought be also contained in the present invention.

(embodiment 1)

Fig. 1 and Fig. 2 is the figure of the microwave heating equipment that embodiments of the present invention 1 are described.Fig. 1 is to illustrate embodiment party The integrally-built axonometric chart of the microwave heating equipment of formula 1, Fig. 2 diagrammatically illustrates the microwave as embodiment 1 Microwave generating unit, waveguide and the heating chamber etc. of the major part in heater.In fig. 2, (a) be from The profile of heating chamber etc. is observed in top, and (b) is the profile observed from front.

Microwave oven 101 as representational microwave heating equipment has: heating chamber 102, and it can be received as generation The food (not shown) of the heating object of table；Magnetron 103, this magnetron 103 is the representativeness producing microwave Microwave generating unit；Waveguide 104, the microwave radiated from magnetron 103 is guided to heating chamber 102 by it；Microwave Radioactive department, it is by the microwave radiation in waveguide 104 to heating chamber 102；And the mounting table 107 of mounting food. It addition, the upper surface that the microwave radiation portion in embodiment 1 is formed from waveguide 104 is (relative with heating chamber 102 Face) 8 openings 105a, 105b, 105c, 105d constitute.

Heating chamber 102 in embodiment 1 is the rectangular shape grown crosswise, and is configured to, and utilizes mounting table 107 Cover the whole bottom surface of heating chamber 102.Mounting table 107 is configured to: using as microwave radiation portion opening 105a, 105b, 105c, 105d cover into and are not exposed in heating chamber 102.The upper surface (mounting surface) of mounting table 107 Be formed flatly so that user easily takes out, put into food, and speckle with in mounting table 107 during spot easy Wiped clean.As the mounting table 107 in embodiment 1, in order to make microwave radiation from opening 105 to heating In room 102, mounting table 107 is easily made the material of microwave transparent constitute by glass or pottery etc..

About the connection status of waveguide 104 with heating chamber 102, it is connected to the microwave transmission side of waveguide 104 To the width (left and right directions in Fig. 2) becoming heating chamber 102.It addition, each opening 105 is by X word The opening shape of shape is constituted, so as to radiation circularly polarized wave, wherein, the opening shape of described X word shape is Elongated rectangular 2 elongated holes (slit) are made mutually to intersect in central spot.8 opening 105a, 105b, When 105c, 105d are to overlook, the width central shaft parallel with direction of transfer of discord waveguide 104 is (hereinafter referred to as Make pipe axle) 108 modes intersected, configure symmetrically about pipe axle 108 line.It addition, waveguide 104 is configured to, When overlooking, pipe axle 108 is by the center in direction before and after the bottom surface 109 of heating chamber 102.8 opening 105a, 105b, 105c, 105d configure symmetrically about central shaft 110 line of the left and right directions of the bottom surface 109 of heating chamber 102.That is, 8 openings 105a, 105b, 105c, 105d are about the bottom surface 109 of heating chamber 102, and front and back/left and right is all symmetrical Ground configuration.It addition, on the direction of transfer of waveguide 104, opening 105a, 105b, 105c, 105d are with in pipe The interval of the 1/3 of wavelength X g configures.It addition, produce standing wave in waveguide 104.Hereinafter, by this standing wave It is referred to as pipe standing internal wave.This pipe standing internal wave has the shape decision of the frequency of oscillation by magnetron 103 and waveguide 104 Wavelength in pipe λ g.Pipe standing internal wave repeats antinode and node every 1/2 wavelength of wavelength in pipe λ g, at waveguide 104 Terminal part 111 at must become node.

It addition, in (b) of Fig. 2, it is illustrated that the image of the pipe standing internal wave produced in waveguide 104.Standing wave Stabilizers 112a, 112b, 112c are such as made up of the conductive material being projected in waveguide 104.Standing wave is stable Portion 112a, 112b, 112c have and mate element and known stub tuner etc. are closely similar with as so-called Structure, is arranged on the position corresponding with the node of pipe standing internal wave.That is, from terminal part 111, every wavelength in pipe λ g 1/2 interval be configured with 3 standing wave stabilizers 112a, 112b, 112c altogether.Herein, steady about these standing waves Determine portion, from terminal part 111 side, the most referred to as first standing wave stabilizers 112a, the second standing wave stabilizers 112b, 3rd standing wave stabilizers 112c.It addition, about each opening, from terminal part 111 side, the most referred to as first opens Mouth 105a, the second opening 105b, the 3rd opening 105c, the 4th opening 105d.

Waveguide 104 is configured to, and the first standing wave stabilizers 112a and the second standing wave stabilizers 112b are about heating chamber The left and right directions central shaft 110 of the bottom surface 109 of 102 is axisymmetricly.Its result, as shown in (b) of Fig. 2, pipe The antinode of standing internal wave is positioned at the position by central shaft 110.It addition, the first opening 105a be positioned at at terminal part 111 And the first relative position of the antinode of the pipe standing internal wave produced between standing wave stabilizers 112a.4th opening 105d is positioned at Relative with the antinode of the pipe standing internal wave produced between the second standing wave stabilizers 112b and the 3rd standing wave stabilizers 112c Position.Second opening 105b and the 3rd opening 105c be positioned at neither relative with the antinode of pipe standing internal wave, the most not with node Relative position.

It addition, as it is shown in figure 1, microwave oven 101 have can be to the door 116 of the opening and closing made above of heating chamber 102. By closing door 116, formed in waveguide 104 and heating chamber 102 and close space, by microwave containment in this closing In space.This microwave being closed will necessarily produce certain standing wave.

Action to the microwave heating equipment of embodiment 1 configured as described above illustrates.

From magnetron 103 radiation microwave transmit in waveguide 104, one part from opening 105a, 105b, 105c, 105d emit in heating chamber 102, and remainder is reflected at terminal part 111.Further, since add Hot cell 102 for closing space, therefore emit to the part of microwave in heating chamber 102 by opening 105a, 105b, 105c, 105d and return in waveguide 104.Its result, can produce certain in waveguide 104 and heating chamber 102 Plant standing wave.Particularly in waveguide 104, easily produce the standing wave that wavelength in pipe is λ g.

It addition, under conditions of the big grade of amount volume of heating object, heating object easily absorb microwave, by opening 105a, 105b, 105c, 105d and to return to the amount of the microwave in waveguide 104 few.Therefore, standing wave is stable.On the other hand, Amount volume at heating object waits less, heating object is difficult to absorb under conditions of microwave, at the opening as microwave radiation portion A fairly large number of in the case of, owing to opening 105a, 105b, 105c, 105d connect with heating chamber 102, therefore The standing wave in waveguide 104 can be upset.And should in the case of, even if somewhat change the amount volume of heating object, material or Modes of emplacement, also can upset the standing wave in waveguide 104, it is impossible to stablize the amplitude of pipe standing internal wave near each opening And phase place.Its result, it is impossible to control the exit dose of the microwave of radiation in heating chamber 102, it is impossible to heating chamber 102 Radiated microwaves equably.

On the other hand, in the microwave oven 101 of embodiment 1, stable owing to being configured with standing wave in waveguide 104 Portion 112a, 112b, 112c, therefore, it is possible to the position of the node of fixing pipe standing internal wave.It is as a result, it is possible to make each The amplitude of the standing wave near individual opening and phase stabilization, it is possible to will be from each opening 105a, 105b, 105c, 105d In heating chamber 102, the exit dose of the microwave of radiation controls into isodose.

Further, since the opening shape that opening 105a, 105b, 105c, 105d are X word shape, thus microwave is made Emit in heating chamber 102 for circularly polarized wave.Circularly polarized wave be while make electric field with opening 105a, 105b, 105c, Centered by 105d circumferentially rotatable while radiating.It addition, as shown in (a) of Fig. 2, opening 105a, 105b, 105c, 105d are about bottom surface 109 equal balanced configuration on fore-and-aft direction and left and right directions of heating chamber 102.Cause This, it is possible to radiated microwaves equably in heating chamber 102, it is possible to the week to the heating object being placed on bottom surface 109 Enclose radiated microwaves equably.

Then, circularly polarized wave is illustrated.Circularly polarized wave is extensively should in the field of mobile communication and satellite communication Technology, as at one's side make use-case, ETC(Electronic Toll Collection System can be enumerated: do not stop Car automatic fare collection system) etc..Circularly polarized wave is that the plane of polarization of electric field is micro-relative to what direct of travel rotated according to the time Ripple, and have the feature that the direction of electric field persistently changed according to the time when forming circularly polarized wave, and electric-field strength The size of degree does not changes.If this circularly polarized wave is applied to microwave heating equipment, then utilize line inclined with conventional The microwave heating of ripple of shaking is compared, and especially can expect to realize heating object in the circumference of circularly polarized wave uniformly heating.Separately Outward, circularly polarized wave is classified as right-handed polarized wave (CW:clockwise, clockwise) and left-handed according to direction of rotation Polarized wave (CCW:counter clockwise, counterclockwise) both, but in heating art, performance is the most special Difference.

As the structure of radiation circularly polarized wave, there are above-mentioned patent documentation 1 and patent documentation 2 like that by the wall of waveguide The structure being made up of paster antenna shown in the structure of opening composition and patent documentation 3.In embodiments of the present invention In the microwave oven of 1, with the structure shown in patent documentation 1 again it is on the upper surface (H face) of waveguide 104 Form opening 105a, 105b, 105c, 105d and radiate the structure of circularly polarized wave.

Circularly polarized wave was mainly used in the communications field originally, and therefore general discussion is to carry out radiating and not returning to open space Return echo, so-called row ripple.On the other hand, in the microwave heating equipment of embodiments of the present invention 1, produce Given birth to towards close space carry out radiating and echo return to waveguide 104 in and with the microwave from magnetron 103 The standing wave that (row ripple) synthesizes, is described according to this standing wave, and wherein, described closing space is by waveguide 104 It is isolated with outside with heating chamber 102.But it is known that from opening 105a, 105b, 105c, 105d The meeting of the standing wave in the moment waveguide 104 of radiated microwaves disequilibrium in heating chamber 102, in waveguide 104 again Secondary return to stable standing wave before period in create row ripple.Therefore, by by opening 105a, 105b, 105c, 105d is set to circularly polarized wave radiation shape, it is possible to utilize the speciality of above-mentioned circularly polarized wave, it is possible to make heating chamber 102 In to add heat distribution more uniform.

It addition, in order to export circle partially from opening 105a, 105b, 105c, 105d of being arranged at square waveguide 104 Shake ripple, the example as shown in (a) of Fig. 2, can be set to following structure: 2 that make to have width long Hole (slit) intersects in centre, is arranged in not by the opening shape having tilted 45 degree relative to microwave transmission direction The position intersected with the pipe axle 108 in the microwave transmission direction of waveguide 104.

Then, use Fig. 3 that the waveguide 104 as microwave transmission portion is illustrated.Fig. 3 is to schematically show The figure of the inner space of simple common waveguide pipe 104.Simplest common waveguide pipe 104 is square waveguide, as Shown in Fig. 3, its inner space is rectangle (width a × highly b) and length by the cross section vertical with tube axial direction Direction is that the cuboid of tube axial direction is constituted.For this square waveguide, it is known that: set microwave at free space Interior wavelength is λ₀Time, by the wavelength X of the width a(microwave at waveguide₀＞ a ＞ λ₀/ 2), highly b(＜ λ₀/ 2) In the range of select, thus with TE10 pattern transmit microwave.

TE10 pattern refers to only exist magnetic-field component on the direction of transfer of waveguide 104 inner waveguide pipe 104 and do not deposit At electric field component, H ripple (TE ripple；H mode transmit Transverse Electric Wave) in transfer mode. It addition, the transfer mode beyond TE10 pattern is not suitable for the waveguide 104 of microwave heating equipment substantially.

Herein, before the explanation of the wavelength in pipe λ g in waveguide 104, the wavelength X to free space₀Say Bright.It is well known that, for the microwave of general microwave oven, the wavelength X of free space₀It is about 120mm.But, The wavelength X of free space₀λ can be used₀=c/f accurately obtains.Herein,_cIt is speed, is fixed as light velocity 3.0*10⁸ ［ m/s ］, and f is frequency, has the bandwidth of 2.4～2.5 ［ GHz ］ (ISM band).As microwave generating unit Frequency of oscillation f of magnetron changes according to fluctuation and loading condition, and result is, the wavelength X of free space₀ Also change, and wavelength X₀At minimum 120 ［ mm ］ (during 2.5GHz) to maximum 125 ［ mm ］ (2.4GHz Time) in the range of change.

Return to the topic of waveguide 104, it is also contemplated that the wavelength X of free space₀Scope, it is however generally that, make For waveguide 104, it is 80～100mm, highly b to be to carry out in the range of 15～about 40mm from width a mostly Select.In the waveguide 104 shown in Fig. 3, upper and lower wide format refers to the face of magnetic field vortex the most abreast, Being referred to as H face 126, the narrow face of left and right refers to the face with field parallel, referred to as E face 127.It addition, microwave is existed Wavelength table when transmitting in waveguide 104 is shown as wavelength in pipe λ g, and Wavelength in pipe λ g changes according to the size of the width a of waveguide 104, but the determination of wavelength in pipe λ g and height b Size unrelated.It addition, in TE10 pattern, at the width (direction of transfer with microwave of waveguide 104 Vertical direction) two ends (E face) 127 in electric field be 0, at central authorities' (pipe axle shown in Fig. 2 of width On 108) electric field maximum.Therefore, during magnetron 103 becomes the width of the waveguide 104 maximum with electric field The structure that centre (on pipe axle 108) combines.

It addition, in the structure of the microwave oven of embodiment 1, as shown in (a) of Fig. 2, radiation circularly polarized wave Opening 105a, 105b, 105c, 105d are the openings making elongated hole (slit) be vertically formed X word shape, be from The central authorities of the width in the H face (upper surface) of waveguide 104 are partial to side and carry out configuring and can producing circle The shape of polarized wave.Opening according to radiation circularly polarized wave is relative in the width in the H face of waveguide 104 Centre (on pipe axle 108) is divided into right-handed polarized wave, left-hand polarized wave near which side.

Hereinafter, the feature of the opening of the X word shape of radiation circularly polarized wave is illustrated.Fig. 4 is simulation result. Obtain owing to the simulation result shown in Fig. 4 emulates, therefore different from reality, it is by complete for the wall of heating chamber 128 Portion is set to radiate the opening 129 formed on border (the not boundary condition of microwave reflection) and waveguide 130 and is only one Individual simple structure.Additionally, be also set to the terminal part 131 of waveguide 130 radiate (the not limit of microwave reflection, border Boundary's condition).Mould shapes when (a) of Fig. 4 is phantom viewed from above.(b) of Fig. 4 is to analyze knot Really, it is the contour map of the top view cross section illustrating the electric-field intensity distribution in heating chamber 128 viewed from above.See Examine (b) of Fig. 4, at heating chamber 128 internal electric field vortex as circularly polarized wave, become centered by opening 129 The left and right directions of direction of transfer 132(paper at waveguide 130) and the width 133(paper of waveguide Above-below direction) on all uniform Electric Field Distribution.

Herein, in the communications field of open space with the heating art closing space, there are some differences, therefore chase after Add explanation.In the field of communications, only receive and dispatch required information in order to avoid the mixing with other microwaves, send lateral spacing Any one party being set in right-handed polarized wave and left-hand polarized wave is transmitted, and receives side and also selects corresponding optimal Reception antenna.On the other hand, in heating art, it not the reception antenna with directivity, but by there is no spy The heating objects such as the food of other directivity receive microwave, and therefore important point is only in that microwave to be allowed is evenly radiated into The entirety of heating object.Therefore, in heating art, even if right-handed polarized wave and left-hand polarized wave depositing the most is not asked Topic, on the contrary, needs to prevent as much as possible owing to mounting position and the shape of heating object cause uneven distribution.Example As, as the simulation architecture of Fig. 4, in the case of microwave radiation portion only has single opening 129, can by by Heating thing is placed on the surface of this opening 129, but deviates on position or right position before and after peristome 129 During ground mounting heating object, it is to leave the near position of mouth 129 to be easily subject to heating eventually, and leaves the portion that mouth 129 is remote Position is not easily susceptible to heating, and it is irregular that result creates heating in heating object.It is therefore preferable that arrange multiple circularly polarized wave Opening.In the microwave oven 101 of embodiment 1, as in figure 2 it is shown, the heating region about heating chamber 102 is symmetrical Ground, be configured with 8 openings 105a, 105b, 105c, 105d with good balance.

Then, use Fig. 5 and Fig. 6 that standing wave stabilizers is illustrated.

Fig. 5 is shown in the standing wave stabilizers 134,135 being provided with drum on waveguide 104 illustrated in fig. 3 Structure.Standing wave stabilizers 134,135 is made up of the conductive material such as aluminum or rustless steel, solid by welding or screw The central part of width due to the H face 126 of waveguide 104.It is provided with in waveguide 104 and has so Standing wave stabilizers 134,135 of structure time, although these standing wave stabilizers are as the protuberance in waveguide 104 And hinder the transmission of microwave, but above this standing wave stabilizers 134,135, easily produce the node of standing wave.Cause This, arrange standing wave stabilizers 134,135 by producing the lower section of the position of the node of standing wave in hope, it is possible to make The position of standing wave is stable and does not changes.Mate it addition, standing wave stabilizers 134,135 has with as so-called Element and the closely similar structure such as known stub tuner, have can be by shape (especially height) simultaneously It is finely adjusted with position and determines the node of standing wave and can carry out mating this 2 functions.In fig. 5 it is shown that The example that the height of the aspect ratio standing wave stabilizers 135 of standing wave stabilizers 134 is high.

It addition, as it is shown in figure 5, the distance between standing wave stabilizers 134 and standing wave stabilizers 135 is being set to (λ g/2) During × n (λ g is wavelength in pipe, and n is integer), it is possible to produce the node of standing wave at two.Itself as a result, it is possible to Between standing wave stabilizers 134 and standing wave stabilizers 135, produce perfect standing wave.Such as, as n=1, at standing wave The top of stabilizers 134,135 produces the node of standing wave, between standing wave stabilizers 134 and standing wave stabilizers 135 Pars intermedia produce standing wave antinode.It addition, as n=2, produce above standing wave stabilizers 134,135 and stay The node of ripple, the pars intermedia between standing wave stabilizers 134 and standing wave stabilizers 135 also produces the node of standing wave.Cause This, it is possible between standing wave stabilizers 134 and standing wave stabilizers 135, produce perfect standing wave.

Fig. 6 is shown in the structure being provided with hemispherical standing wave stabilizers 136 on waveguide 104 illustrated in fig. 3. Standing wave stabilizers 136 shown in Fig. 6 such as can by the H face of waveguide 104 is struck out internally prominent and Formed.In the case of Gai, standing wave stabilizers 136 can be constituted with the material identical with waveguide 104, it is not necessary in order to Form standing wave stabilizers 136 and parts are additionally set.

Then, the difference of the distance (spacing) between opening adjacent one another are the difference of the magnetic distribution caused is entered Row explanation.

Fig. 7 diagrammatically illustrates as the major part in the microwave oven of the microwave heating equipment of comparative example, and (a) is Top plan view, (b) is main pseudosection.The microwave oven 101 of the microwave oven of comparative example and embodiment 1 is not Being with putting, microwave radiation portion is made up of 6 openings 137a, 137b, 137c, this opening 137a, 137b, 137c On the direction of transfer of waveguide 104, the interval with the 1/2 of wavelength in pipe λ g configures.

Fig. 8 is the microwave oven 101 to embodiment 1 and the difference of the heat characteristic of the microwave oven of comparative example illustrates Figure.In fig. 8, (a) shows, with the microwave oven of comparative example, food (freezing braised meal) has been carried out one regularly Between heating after, measure the Temperature Distribution during surface temperature of this food from top with thermal imaging system (Thermo Viewer), B () schematically shows the heating in this food uneven.It addition, in fig. 8, (c) shows with embodiment 1 Microwave oven 101 food (freezing braised meal) has been carried out certain time heating after, with thermal imaging system from top measure should The Temperature Distribution during surface temperature of food, it is uneven that (d) schematically shows the heating in this food.

As shown in (a) and (b) of Fig. 8, in the microwave oven of comparative example, (freezing braised at the above-below direction of paper Direction before and after meal) on remain a lot of non-heating region 138.On the other hand, such as (c) and (d) institute of Fig. 8 Showing, in the microwave oven of embodiment 1, non-heating region 138 becomes little.It follows that embodiment 1 Microwave oven compared with the microwave oven of comparative example, it is possible to more uniformly food is heated.

Fig. 9 shows and has carried out the result of electromagnetic field analysis to investigate its reason.Fig. 9 is to by adjacent one another are The figure that the difference of the magnetic distribution that the difference of spacing P between opening 139a, 139b causes illustrates.At figure In 9, (a) is the model image figure of electromagnetic field analysis, and (b) is to illustrate the microwave that P=λ g/2(is equivalent to comparative example The structure of stove) time the contour map of analysis result, (c) is to illustrate that P=λ g/3(is equivalent to the micro-of embodiment 1 The structure of ripple stove) time the contour map of analysis result.

As shown in (b) of Fig. 9, as P=λ g/2, the part of electromagnetic field intensity is only the attached of opening 139a, 139b Closely, the skewness of electromagnetic field.This is because, as P=λ g/2, although opening 139a, 139b are positioned at and pipe The position that part that the amplitude size of standing internal wave is identical is relative, but the direction of the phase place of this pipe standing internal wave is phase negative side To, therefore produce interference (cancelling out each other).In contrast, as shown in (c) of Fig. 9, as P=λ g/3, electricity The strong part in magnetic field is not only the vicinity of opening 139a, 139b, and also extends between them, electromagnetic field It is distributed more uniform.This is because, as P=λ g/3, opening 139a, 139b are positioned at and the phase place side of pipe standing internal wave To the position that identical part is relative, do not produce interference (cancelling out each other).I.e., it is believed that interference is not due to opening Distance between 139a, 139b is near and produces, but produces due to the relation with the phase place of pipe standing internal wave.

Hereinafter, the effect in the microwave oven 101 of embodiment 1 and effect are illustrated.

The microwave oven 101 of embodiment 1 has: the heating chamber 102 of storage heating object；Produce the magnetron of microwave 103；Transmit the waveguide 104 of microwave；From waveguide 104 to multiple opening 105a of radiated microwaves in heating chamber 102, 105b, 105c, 105d, microwave oven 101 is configured in waveguide 104 produce standing wave.Configured as described above In the microwave oven 101 of embodiment 1, the standing wave every pipe on the direction of transfer of waveguide produced in waveguide 104 The 1/2 of interior wavelength X g repeats antinode (producing the position of peak swing) and node (is nearly free from the portion of amplitude Position).Therefore, when comparing in standing wave at the two of the 1/2 of wavelength in pipe λ g, become that to create amplitude identical And the opposite phase relationship of ripple in opposite direction.Therefore, in the microwave oven 101 of embodiment 1, by multiple openings In 105a, 105b, 105c, 105d at least 1 is arranged on the position relative with the antinode of standing wave, and with pipe The interval of the 1/3 of interior wavelength X g configures the plurality of opening.According to this structure, with relative the staying of opening adjacent one another are Ripple part is all without becoming opposite phase relationship (interval of the odd-multiple of the 1/2 of wavelength in pipe λ g).Its result, The situation (interference) cancelled out each other from the microwave of opening radiation adjacent one another are can be suppressed.Therefore, it is possible to do not make In the case of drive mechanism, the heating object in heating chamber 102 is uniformly heated up.

It addition, it is said that in general, when the quantity of opening increases, the microwave in waveguide 104 easily emits to heating chamber In 102.Thus, when microwave emits in heating chamber 102 in order, it is difficult to maintain the standing wave in waveguide 104, The state labile of standing wave.Its result, the phase place of the microwave relative with each opening is moved and amplitude also becomes Dynamic.On the other hand, the microwave oven 101 due to embodiment 1 has the position of the standing wave in making waveguide 104 Stable standing wave stabilizers 112a, 112b, 112c, therefore, it is possible to the disorder of suppression standing wave, it is possible to make that there is the phase The amplitude hoped is relative with multiple opening 105a, 105b, 105c, 105d with the standing wave part of phase place.Thereby, it is possible to Suppress situation about simultaneously cancelling out each other from the microwave of each opening 105a, 105b, 105c, 105d radiation more reliably (interference).Therefore, it is possible in the case of not using drive mechanism to the heating object in heating chamber 102 equably Heating.

It addition, in the microwave oven 101 of embodiment 1, standing wave stabilizers 112a, 112b, 112c are configured to Produce the node of standing wave in waveguide 104, and be arranged in the terminal part 111 with waveguide 104 in the transmission direction The position of the distance of the integral multiple of the 1/2 of wavelength in pipe λ g apart.According to this structure, it is possible to from waveguide 104 Terminal part 111, every the integral multiple of the 1/2 of wavelength in pipe λ g, more reliably form the node of standing wave, The disorder of suppression standing wave, it is possible to make to have the standing wave part of desired amplitude and phase place and multiple opening 105a, 105b, 105c, 105d are relative.It is as a result, it is possible to suppress more reliably from each opening 105a, 105b, 105c, 105d The situation (interference) that the microwave of radiation is cancelled out each other.Therefore, it is possible to heating in the case of not using drive mechanism Heating object in room 102 is uniformly heated up.

It addition, in the microwave oven 101 of embodiment 1, in the transmission direction with the 1/2 of wavelength in pipe λ g whole The interval of several times is configured with multiple standing wave stabilizers 112a, 112b, 112c.According to this structure, it is possible to from waveguide The terminal part of 104 111, every the integral multiple of the 1/2 of wavelength in pipe λ g, more reliably forms the node of standing wave, The disorder of suppression standing wave, it is possible to make to have the standing wave part of desired amplitude and phase place and multiple opening 105a, 105b, 105c, 105d are relative.It is as a result, it is possible to suppress more reliably from each opening 105a, 105b, 105c, 105d The situation (interference) that the microwave of radiation is cancelled out each other.Therefore, it is possible to heating in the case of not using drive mechanism Heating object in room 102 is uniformly heated up.

It addition, in the microwave oven 101 of embodiment 1, the first standing wave stabilizers 112a and the second standing wave stabilizers 112b configures with the interval of the 1/2 of wavelength in pipe λ g in the transmission direction.Herein, stable due to the first standing wave Portion 112a and the second standing wave stabilizers 112b are configured to produce the node of standing wave, and therefore the centre at them produces and stays The antinode of ripple.Additionally, in the microwave oven 101 of embodiment 1, the first opening 105a, the second opening 105b, 3rd opening 105c and the 4th opening 105d joins with the interval of the 1/3 of wavelength in pipe λ g in the transmission direction Put.Further, the second opening 105b and the 3rd opening 105c is arranged in the first standing wave stabilizers 112a and the second standing wave Between stabilizers 112b.Therefore, the second opening 105b and the 3rd opening 105c be positioned at neither with the node phase of standing wave To, the most not relative with antinode position.

It addition, in the same manner as the first standing wave stabilizers 112a and the second standing wave stabilizers 112b, by the second opening 105b and the 3rd opening 105c be configured to about central shaft 110 in line symmetry in the case of, from the second opening 105b Distance to the node of standing wave becomes the 1/2-wavelength in pipe of the 1/12(=(wavelength in pipe λ g of wavelength in pipe λ g The 1/3 of λ g)/2), become the 1/6 of wavelength in pipe λ g from second opening 105b distance to the antinode of standing wave The 1/3 of (=(wavelength in pipe)/2).That is, the second opening 105b is compared to the antinode of standing wave, closer to node. Equally, the 3rd opening 105b is compared to the antinode of standing wave, closer to node.On the other hand, the first opening 105a quilt Be configured to the second opening 105b at a distance of wavelength in pipe λ g 1/3 distance, this second opening 105b is configured to With the node of standing wave at a distance of the 1/12 of wavelength in pipe λ g distance.That is, the first opening 105a is configured to and standing wave Node at a distance of wavelength in pipe λ g 1/4(=wavelength in pipe λ g 1/3-wavelength in pipe λ g 1/12) distance. Owing to becoming the antinode of standing wave at a distance of the position of distance of the 1/4 of wavelength in pipe λ g with the node of standing wave, therefore the 1st Opening 105a is positioned at the position relative with the antinode of standing wave.Equally, the 4th opening 105d is positioned at the antinode with standing wave Relative position.It addition, the position of the 1st opening 105a and the 4th opening 105d is managed at a distance of wavelength in pipe λ g(=( The 1/3 of interior wavelength X g) × 3) distance.Therefore, relative for opening 105a with the 1st standing wave part and with the 4th Standing wave part relative for opening 105d has identical amplitude and phase place.As described above, the second opening 105b With the position that the 3rd opening 105c is all located at the node near standing wave, the first opening 105a and the 4th opening 105d The position that the antinode of the standing wave being positioned at and have identical amplitude and phase place is relative, each opening 105a, 105b, 105c, 105d are symmetrical in line about central shaft 110.According to this structure, can be more uniformly in heating chamber 102 The heating object being centrally disposed on axle 110 is heated.

It addition, in the microwave oven 101 of embodiment 1, multiple opening 105a, 105b, 105c, 105d are respectively Be formed as not intersecting with pipe axle 108 when overlooking.In the most common TE10 pattern, at the width of waveguide 104 The center in direction, electric field is maximum, and at the two ends of waveguide 104, electric field is 0.Assuming to cross pipe axle 108 In the case of mode is provided with opening 105a, 105b, 105c, 105d, this opening has crossed the point that electric field is maximum. Now, it may occur however that the quantitative change of the microwave radiated by other openings from 1 opening substantial amounts of microwave of radiation is lacked, There is the situation of deviation in the amount of the microwave radiated from each opening.In contrast, by not intersect with pipe axle 108 Mode forms each opening 105a, 105b, 105c, 105d, it is possible to make from each opening 105a, 105b, 105c, The amount of the microwave of 105d radiation is uniform.Therefore, it is possible to in heating chamber 102 in the case of not using drive mechanism Heating object be uniformly heated up.

It addition, in the microwave oven 101 of embodiment 1, multiple opening 105a, 105b, 105c, 105d are bowing Apparent time is symmetrically arranged at the both sides of pipe axle 108.According to this structure, not only on the direction of transfer of waveguide 104, And on the width of waveguide 104, be also configured with multiple opening, therefore, it is possible to configure more opening.It addition, In the most common TE10 pattern, at the center of the width of waveguide 104, electric field is maximum, at waveguide 104 The two ends of width, electric field is 0.That is, electric field has the characteristic of pipe axle 108 symmetry about waveguide 104. Therefore, when as above opening 105a, 105b, 105c, 105d being configured at the both sides of pipe axle 108, each Opening easily radiates the microwave of isodose.Therefore, according to said structure, in the transmission direction with the width of waveguide 104 All there are on degree direction multiple opening 105a, 105b, 105c, 105d of the microwave that can radiate isodose, it is possible to Radiated microwaves on a large scale in heating chamber 102, therefore, it is possible to heating chamber in the case of not using drive mechanism Heating object in 102 is uniformly heated up.

It addition, the microwave oven 101 of embodiment 1 is configured to opening 105a, 105b, 105c, 105d to heating chamber Heat release regional radiation circularly polarized wave in 102.Thus, knowable to the simulation result of Fig. 4, the microwave of embodiment 1 Stove 101 can produce centered by opening 105a, 105b, 105c, 105d circularly polarized wave distinctive 360 degree complete The electric field that rotates up of side, from the central vortex of each opening to radiated microwaves in heating chamber 102, it is possible to circumference Direction is uniformly heated up.It is as a result, it is possible to entirety radiated microwaves equably to heating chamber 102, it is possible to do not using In the case of drive mechanism, the heating object in heating chamber 102 is uniformly heated up.

And, in the microwave oven 101 of embodiment 1, radiation the opening 105a of circularly polarized wave, 105b, 105c, 105d is made up of the X word shape that 2 elongated holes (slit) are intersected with each other.Therefore, in the structure of embodiment 1, Circularly polarized wave can be reliably radiated from waveguide 104 with simple structure.

It addition, at patent documentation 4(Japanese Unexamined Patent Publication 10-284246 publication) in, as shown in figure 24, disclose Multiple rectangular slits 140,141,142,143 are joined with the interval of the 1/4 of wavelength in pipe in the transmission direction The structure put.In the structure shown in Figure 24, the side in rectangular slits adjacent one another are is arranged on sinusoidal wave The relative position of antinode, the opposing party in rectangular slits adjacent one another are is arranged on relative with sinusoidal wave node Position.Such as, rectangular slits 140 is arranged on the position relative with sinusoidal wave antinode, with this rectangle The rectangular slits 141 that slit 140 is adjacent is arranged on the position relative with sinusoidal wave node.It addition, rectangle is narrow Seam 142 is arranged on the position relative with sinusoidal wave antinode, the rectangular slits adjacent with this rectangular slits 142 143 are arranged on the position relative with sinusoidal wave node.And, rectangular slits 141 is arranged on and sinusoidal wave ripple Saving relative position, the rectangular slits 142 adjacent with this rectangular slits 141 is arranged on and sinusoidal wave antinode Relative position.According to this structure, between opening adjacent one another are, above-mentioned interference will not be caused.But, such as, The standing wave part relative with opening 140 and the standing wave relative with opening 142 are partially in that amplitude is identical and phase place is phase Reciprocal opposite phase relationship.Therefore, between opening 140 and opening 142, above-mentioned interference may be caused. It addition, the opening 140,141,142,143 of patent documentation 4 to be deformed into the X word that can radiate circularly polarized wave During shape, the end (end of X word) of opening adjacent one another are is connected to each other, and is actually unable in constituting in this wise.

It addition, in embodiment 1, discuss opening 105a, 105b, 105c, 105d or standing wave stabilizers 112a, During the interval of 112b, 112c, employ 1/2 grade of wavelength in pipe λ g on the direction of transfer of waveguide 104 so Statement illustrate, but the 1/2 of wavelength in pipe λ g allow a certain degree of scope.Due in waveguide 104 The wavelength in pipe of microwave be λ g, therefore if the deviation of about the 1/8 of wavelength in pipe λ g, then it is assumed that be not have The allowed band of large change.This is because, when considering sinusoidal wave, if the deviation from 1/4 wavelength, then maximum or Minimum to change to 0,0 maximum or minimum to change to, and this is bigger change.But, if the deviation from About 1/8 wavelength of the half being equivalent to 1/4 wavelength, the most substantially there is no the conversion of magnitude relationship, and maintain identical Trend.Wavelength in pipe λ g usesRepresent.As it has been described above, free space Wavelength X₀Being 120～125mm, the width a of the waveguide 104 in embodiment 1 is width a=100mm's In the case of, wavelength in pipe λ g is 150mm(2.5GHz)～160mm(2.4GHz), it 1/8 is 18.75～20mm. Therefore, for 1/2 of the wavelength in pipe λ g on direction of transfer, with the lucky 1/2(75 of wavelength in pipe λ g～ On the basis of 80mm), the deviation within further the 1/2 of the 1/8 of wavelength in pipe λ g is allowed band.Concrete and Speech, the allowed band of deviation is 9.375～10mm.Accordingly, it is considered to arrive the allowed band of this deviation, wavelength in pipe λ g 1/2 be minimum 65mm～maximum 90mm.

It addition, in embodiment 1, in the distance discussed between the opening relevant to the direction of transfer of waveguide 104 Time, only account for along waveguide wall (face corresponding with bottom of heating chamber) connect each opening 105a, 105b, The component of the direction of transfer in the air line distance at the center of 105c, 105d.And be assumed to by same thickness, identical In the case of the sheet material of proportion constitutes each opening shape, the central representation of opening 105a, 105b, 105c, 105d The position of centre of gravity of this sheet material.

Although it addition, in embodiment 1, by least 1 in multiple opening 105a, 105b, 105c, 105d Individual it is arranged on the position relative with the antinode of standing wave, and configures the plurality of opening with the interval of the 1/3 of wavelength in pipe, But the present invention is not limited to this.For example, it is also possible to by the 1st opening (the 1st microwave radiation portion) in multiple openings It is arranged in the position relative with the antinode of standing wave, by 2nd opening (2nd microwave radiation adjacent with the 1st opening Portion) be arranged in the 1st opening apart exceed on the direction of transfer of waveguide 104 wavelength in pipe 1/4 and less than pipe The position of the distance of the 1/2 of interior wavelength.Now, relative with the 1st opening standing wave part and with the 2nd opening phase To standing wave part also will not become the relation of opposite phase, also therefore be able to suppress from the radiation of the 1st microwave radiation portion The situation (interference) that microwave and the microwave from the radiation of the 2nd microwave radiation portion are cancelled out each other.Therefore, it is possible to do not make In the case of drive mechanism, the heating object in heating chamber is uniformly heated up.

It addition, in order to the 1st opening being arranged in the position relative with the antinode of standing wave, such as, as long as by the 1st Opening is arranged in and is configured at the terminal part 111 of side away from magnetron 103 at a distance of wavelength in pipe in waveguide 104 1/4 the position of distance of odd-multiple.Node due to standing wave must be positioned at the terminal part of waveguide 104 111, therefore the antinode of standing wave be positioned at terminal part 111 at a distance of the 1/4 of wavelength in pipe the position of distance of odd-multiple.

It addition, in multiple opening 105a, 105b, 105c, 105d, the 1st opening is preferably configured near end End 111.Namely it is preferred that the 1st opening being arranged in the position relative with the antinode of standing wave is opening 105a. According to this structure, it is possible to make the position (waveform) of the standing wave in waveguide 104 stablize.

It addition, as in figure 2 it is shown, opening 105a, 105d of being arranged in the both ends of heating chamber 102 are preferably provided at The position relative with the antinode of standing wave.When the antinode with standing wave has been arranged as opposed to opening, easily radiation is more Microwave.By being configured to the central part of the heating chamber 102 intensive compared to opening, put from the both ends of heating chamber 102 Penetrate more microwave, easily make the microwave distribution in heating chamber 102 more uniform.

(embodiment 2)

Hereinafter, referring to the drawings the microwave heating equipment of embodiments of the present invention 2 is illustrated.Figure 10 is explanation As the figure of the structure of the major part in the microwave oven of the microwave heating equipment of embodiments of the present invention 2, schematically Show microwave generating unit, waveguide and heating chamber etc..In Fig. 10, (a) is heating chamber viewed from above etc. Profile, (b) is the profile observing heating chamber etc. from front.Hereinafter, about the microwave oven of embodiment 2, To illustrate centered by the difference of embodiment 1.

In the microwave oven of embodiment 2, have: using from the microwave radiated as the magnetron 201 of microwave generating unit Guide the waveguide 203 curving L-shaped (with reference to (b) of Figure 10) to heating chamber 202；By waveguide 203 In microwave radiation to 8 openings 204,205,206,207 as microwave radiation portion in heating chamber 202； And mounting is as the mounting table 208 of the food (not shown) of heating object.8 openings as microwave generating unit 204,205,206,207 upper surface being formed at waveguide 203.

The bottom space 209 of the lower section being formed at heating chamber 202 is in order at the upper surface being formed at waveguide 203 Opening 204 and guarantee that a certain distance sets as between the mounting table 208 of the substantial bottom surface of heating chamber 202 Put.Bottom space 209 is that below the middle body of the bottom surface 210 making heating chamber 202 side is narrowed by inclined-plane Mode is prominent to be formed.The lower face side of bottom space 209 is made up of the upper surface of waveguide 203, bottom space The upper surface side of 209 is made up of the lower surface of mounting table 208.Mounting table 208 utilizes putty (putty) or sealing member Etc. the Outboard Sections of the bottom surface 210 being fixed on heating chamber 202, thus close into make opening 204,205,206, 207 are not exposed in heating chamber 202.Mounting table 208 is formed more slightly smaller than bottom surface 210.

Opening 204,205,206,207 is configured to, and when overlooking, discord waveguide 203 puts down with direction of transfer The width central shaft (hereinafter referred to as pipe axle) 211 of row intersects.It addition, opening 204,205,206,207 It is configured to, symmetrical about pipe axle 211 line when overlooking.In other words, opening 204,205,206,207 about Before and after the bottom surface 210 of heating chamber 202, direction configures symmetrically.

It addition, opening 204,207 is arranged in the position relative with the antinode of standing wave.It addition, opening 204,205, 206,207 be not in the transmission direction according to wavelength in pipe λ g 1/3 uniform intervals configure, but according to Exceed the 1/4 of wavelength in pipe λ g and configure less than unevenly spaced in the range of 1/2.Opening 204 and opening The interval P3 between interval P1 and opening 206 and opening 207 between 205 is set to than wavelength in pipe λ g 1/3 slightly larger.It addition, the interval P2 between opening 204 and opening 205 is set 1/3 than wavelength in pipe λ g Slightly smaller.It addition, about the effect by this unevenly spaced realization, will the embodiment 5 below describe, Omit the description the most herein.

It addition, in order to make pipe standing internal wave stable, at the terminal part 212 with waveguide 203 at a distance of wavelength in pipe λ g's The position of 3/2 is provided with standing wave stabilizers 213.Standing wave stabilizers 213 produces the node of pipe standing internal wave, and sets It is set to, the terminal part 212 of waveguide 203 and the central authorities of standing wave stabilizers 213 and the bottom surface 210 of heating chamber 202 The centrage 214 of left and right directions consistent.And be arranged to, central authorities between opening 204 and opening 207 and Central authorities between opening 205 and opening 206 also with the centrage 214 of the left and right directions of the bottom surface 210 of heating chamber 202 Unanimously.Thus, opening 204,205,206,207 is symmetrical about the left and right directions of the bottom surface 210 of heating chamber 202 Ground configuration.

As shown in (a) of Figure 10, opening 204,205,206,207 is to make elongated hole (slit) be crossed as X word The opening of shape, be configured in the way of not pipe axle 211 with waveguide 203 intersects pipe axle 211 both sides ( For the upper side and lower side in (a) of Figure 10) and the shape of circularly polarized wave can be radiated.

In the microwave oven of embodiment 2, multiple openings 204,205,206,207 are according to exceeding wavelength in pipe λ g 1/4 and less than the 1/2 of wavelength in pipe λ g in the range of unevenly spaced configure, opening 204,207 is joined Put in the position relative with the antinode of standing wave.According to this structure, the standing wave part relative with opening adjacent one another are is also All will not become the relation (interval of the odd-multiple of the 1/2 of wavelength in pipe λ g) of opposite phase.Its result, energy The situation (interference) that enough suppression are cancelled out each other from the microwave of opening radiation adjacent one another are.Therefore, it is possible to do not using In the case of drive mechanism, the heating object in heating chamber 202 is uniformly heated up.

It addition, in the microwave oven of embodiment 2, standing wave stabilizers 213 is configured to produce in waveguide 203 stay The node of ripple, and it is configured in the terminal part 212 with waveguide 203 in the transmission direction at a distance of wavelength in pipe λ g 3/2 the position of distance of integral multiple.According to this structure, it is possible to from the terminal part 212 of waveguide 203, Every the integral multiple of the 1/2 of wavelength in pipe λ g, more reliably form the node of standing wave, suppress the disorder of standing wave, Enable to that there is desired amplitude relative with multiple openings 204,205,206,207 with the standing wave part of phase place. It is as a result, it is possible to suppress the microwave radiated from each opening 206,207,208,209 to cancel out each other more reliably Situation (is disturbed).Therefore, it is possible to it is equal to the heating object in heating chamber 202 in the case of not using drive mechanism Heat evenly.

(embodiment 3)

Hereinafter, referring to the drawings the microwave heating equipment of embodiments of the present invention 3 is illustrated.Figure 11 is explanation As microwave radiation portion, standing wave and waveguide in the microwave oven of the microwave heating equipment of embodiments of the present invention 3 The figure of the relation between wall electric current.Hereinafter, about the microwave oven of embodiment 3, with the difference with embodiment 1 Centered by illustrate.

In the microwave oven of embodiment 3, as shown in (c) of Figure 11, as multiple openings in microwave radiation portion 301 are arranged on the position that not axis of symmetry 601 with the left and right directions of heating chamber intersects.(c) that observe Figure 11 can To be clear that, waveguide tube wall electric current becomes the state concentrating on most axis of symmetry 601 with the point of intersection of pipe axle 901. It is said that in general, in microwave heating equipment, it is recommended that the central part mounting heating object in the bottom surface of heating chamber.Axis of symmetry 601 is the most consistent with the central part of the bottom surface of heating chamber with the intersection point of pipe axle 901.

Figure 12 is that microwave radiation portion, standing wave and the ripple as in the microwave oven of the microwave heating equipment of comparative example is described The figure of the relation between catheter wall electric current.As shown in (c) of Figure 12, in the microwave oven of comparative example, multiple openings 1 configuration as above in 301 is on axis of symmetry 601.Upper when at the opening 301 being configured on this axis of symmetry 601 When side has loaded the heating object 302 of little bulk as Rhizoma Solani tuber osi, not only waveguide tube wall electric current easily concentrates on this and is added Hot thing 302, and the microwave transmitted in waveguide 306 directly emits to heating object 302 through opening 301 On.Now, heating concentrates on the bottom of heating object 302, easily produces heating.

In contrast, by as the microwave oven of embodiment 3, opening 301 is arranged on not with axis of symmetry 601 The position intersected, thus as shown in figure 13, even if the position on the axis of symmetry 601 that waveguide tube wall electric current is concentrated most Load heating object 302, it is also possible to avoid the microwave transmitted in waveguide 306 directly to put through opening 301 It is mapped on heating object 302.Concentrate on the bottom of heating object 302 therefore, it is possible to prevent from heating and heating occurred.

It addition, from the standpoint of convenience from the sag and swell of heating chamber or user etc., make heating object 302 when recommending the position that mounting position becomes the central part deviating from bottom of heating chamber, it is also possible to deviate from through this The position of the central part of bottom of heating chamber and set axis of symmetry 601.

(embodiment 4)

Hereinafter, referring to the drawings the microwave heating equipment of embodiments of the present invention 4 is illustrated.Figure 14 is explanation As microwave radiation portion, standing wave and waveguide in the microwave oven of the microwave heating equipment of embodiments of the present invention 4 The figure of the relation between wall electric current.Hereinafter, about the microwave oven of embodiment 4, with the difference with embodiment 3 Centered by illustrate.It addition, in the explanation of embodiment 4, identical with above-mentioned embodiment 3 for having The structural element of function marks identical reference numeral, omits the description.

In the microwave oven of embodiment 4, as shown in figure 14, it is set as: as adjacent with axis of symmetry 601 micro- The width ratio of the opening 301a of ripple radioactive department is as the opening 301b in not adjacent with axis of symmetry 601 microwave radiation portion Width is big.

As shown in (c) of Figure 14, in the way of cutting off waveguide tube wall electric current, it is being provided with opening 301a, 301b In the case of, towards the microwave radiation direction vertical with the magnetic field below electric field and opening 301a, 301b (i.e., In heating chamber) radiated microwaves, wherein, described electric field be utilize opening 301a, 301b cut off waveguide tube wall electric current and Produce.It addition, waveguide tube wall electric current flows up in the side vertical with magnetic field.

When by the width of opening 301a from the width expansion shown in (a) of Figure 15 to the width shown in (b) of Figure 15 When spending, for cutting off the failure of current effective width 1502 of waveguide tube wall electric current than failure of current effective width 1501 Narrow.Therefore, it is suppressed that the magnetic field that waveguide tube wall electric current is cut off by opening 301a and produces, it is suppressed that from opening 301a The amount of the microwave of radiation.

Therefore, even if the heating object 302 of little bulk as by Rhizoma Solani tuber osi is arranged on axis of symmetry 601, pass through The width of enlarged openings 301a, it is also possible to suppression emits to the amount of the microwave of the bottom of heating object 302, it is possible to press down Made the generation of heating.

It addition, the width of opening 301a preferably width big more than 10% than opening 301b.Thereby, it is possible to it is the most true Recognized the inhibition of heating.

It addition, big by the width of the width ratio peristome 301b that makes peristome 301a, expand bottom of heating chamber Aperture area near central part.Therefore, the central part in bottom of heating chamber has loaded the big heating object of load 302 Time (such as, putting into the 1L water in the cylindrical chamber of diameter 19 centimetres), it is possible to increase for the quilt that this load is big The efficiency of heating surface of heating thing 302.

(embodiment 5)

Hereinafter, referring to the drawings the microwave heating equipment of embodiments of the present invention 5 is illustrated.Figure 16 is explanation Figure as the configuration space in the microwave radiation portion in the microwave oven of the microwave heating equipment of embodiments of the present invention 5. Hereinafter, about the microwave oven of embodiment 5, to illustrate centered by the difference of embodiment 3.It addition, In the explanation of embodiment 5, identical with the structural element mark of above-mentioned embodiment 3 identical function for having Reference numeral, omit the description.

In the microwave oven of embodiment 5, make with according to the configuration evenly and at intervals bigger than the 1/4 of wavelength in pipe λ g Situation (with reference to (a) and (b) of Figure 16) for the configuration space on the direction of transfer of the opening 301 in microwave radiation portion Compare, make opening 301a to offset in the way of axis of symmetry 601.Thus, with close to the 1/4 of wavelength in pipe λ g The interval (with reference to (c) and (d) of Figure 16) of mode shortens and axis of symmetry 601 is adjacent opening 301a, 301a.

About 4 the opening 301as adjacent with axis of symmetry 601, as shown in (a) of Figure 17 and (b) of Figure 17, When 2 be arranged on the direction tilted relative to axis of symmetry 601 openings 301a, 301a are set to one group, can To resolve into two groups.Opening 301a, 301a of one group is same with the microwave radiation portion in generally known directional coupler The configuration of sample ground.

Then, the principle of directional coupler is briefly described.Figure 18 and Figure 19 is directional coupler is described former The figure of reason.

As shown in (g) of Figure 18, the 1st waveguide the 1801 and the 2nd waveguide 1802 is by the 1st microwave radiation portion 1803 and the 2nd microwave radiation portion 1804 and connect.An end of the 1st waveguide 1801 is provided with input The input unit 1805 of microwave, is provided with the output unit of output microwave on another end of the 1st waveguide 1801 1806.It addition, be provided with the output unit 1807 of output microwave on an end of the 2nd waveguide 1802, the The output unit 1808 of output microwave it is provided with on another end of 2 waveguides 1802.Defeated by input unit 1805 The microwave entered in the 1st waveguide 1801 is by the 1st microwave radiation portion 1803 and the 2nd microwave radiation portion 1804 Emit in the 2nd waveguide 1802.Emitted in the 2nd waveguide 1802 by the 1st microwave radiation portion 1803 The radial location 1809 that is branched to above via the 1st microwave radiation portion 1803 of microwave advance to output unit 1807 Microwave and advance to output unit 1808 and arrive the in-position 1812 above the 2nd microwave radiation portion 1804 Microwave.It addition, the microwave emitted in the 2nd waveguide 1802 by the 2nd microwave radiation portion 1804 is branched For advance to output unit 1807 and arrive in-position 1810 above the 1st microwave radiation portion 1803 microwave, with And the microwave advanced to output unit 1808 via the radial location 1811 above the 2nd microwave radiation portion 1804.

(a) of Figure 18 shows the waveform of the microwave at radial location 1809.(b) of Figure 18 shows arrival The waveform of the microwave at position 1810.(c) of Figure 18 shows the microwave shown in (a) of Figure 18 and Figure 18's The synthetic waveform of the microwave shown in (b).As shown in (a) and (b) of Figure 18, micro-at in-position 1810 Ripple relative to the microwave at radial location 1809, phase offset the 1/2 of wavelength in pipe λ g.This is because, the 1st Microwave radiation portion 1803 configures at a distance of the distance of the 1/4 of wavelength in pipe λ g with the 2nd microwave radiation portion 1804, with The microwave being emitted to radial location 1809 by the 1st microwave radiation portion 1803 is compared, by the 2nd microwave radiation portion 1804 and reach the distance that the microwave of in-position 1810 moves 2 times of 1/4 of wavelength in pipe λ g more.Therefore, As shown in (c) of Figure 18, the microwave at radial location 1809 and the synthetic waveform of the microwave at in-position 1810 Amplitude be 0.Therefore, microwave is not exported from output unit 1807.

It addition, (d) of Figure 18 shows the waveform of the microwave at radial location 1811.(e) of Figure 18 illustrates The waveform of the microwave at in-position 1812.(f) of Figure 18 show the microwave shown in (d) of Figure 18 with The synthetic waveform of the microwave shown in (e) of Figure 18.As shown in (d) and (e) of Figure 18, radial location 1811 The microwave at place is identical with the amplitude of the microwave at in-position 1812 and phase place.This is because, put by the 2nd microwave Penetrate portion 1804 and emit to the microwave of radial location 1811 and reached by the 1st microwave radiation portion 1803 The displacement of the microwave reaching position 1812 is identical.Therefore, the microwave at radial location 1811 and in-position 1812 The amplitude of the synthetic waveform of the microwave at place is the microwave (or the microwave at in-position 1812) at radial location 1811 2 times of amplitude.Therefore, export, from output unit 1808, the microwave that amplitude is 2 times.

Then, Figure 19, the midpoint 1901 to the 1st microwave radiation portion 1804 of microwave radiation portion the 1803 and the 2nd are used The amplitude of the microwave at place illustrates.(a) of Figure 19 shows and emits to by the 1st microwave radiation portion 1803 2 waveguides 1802 are interior and advance to output unit 1808 and reach the waveform of the microwave at midpoint 1901.(b) of Figure 19 Show in emitting to the 2nd waveguide 1802 by the 2nd microwave radiation portion 1804 and advance to output unit 1807 and Reach the waveform of the microwave at midpoint 1901.(c) of Figure 19 shows the microwave shown in (a) of Figure 19 and figure The synthetic waveform of the microwave shown in (b) of 19.Microwave shown in (b) of Figure 19 (a) institute relative to Figure 19 The microwave shown, phase offset the 1/4 of wavelength in pipe λ g.This is because, and by the 1st microwave radiation portion 1803 And the microwave arriving midpoint 1901 is compared, the microwave being arrived midpoint 1901 by the 2nd microwave radiation portion 1804 is many Move wavelength in pipe λ g 1/4 distance.Therefore, as shown in (c) of Figure 19, by the 2nd microwave radiation Portion 1804 and arrive the microwave at midpoint 1901 and arrive the micro-of midpoint 1901 with by the 1st microwave radiation portion 1803 The amplitude of these microwaves of amplitude ratio of the synthetic waveform of ripple is big, and the amplitude than the 2 of these microwaves times is little.

Therefore, as shown in (a) and (b) of Figure 17, by same with the microwave radiation portion in above-mentioned directional coupler The opening 301a of each group of sample ground configuration, it is possible to the amplitude of the synthetic waveform of the microwave between the opening 301a of each group is omited Micro-die down.Thus, even if the heating object 302 of little bulk as by Rhizoma Solani tuber osi is positioned on axis of symmetry 601, It also is able to suppress the generation of heating.

It addition, in the microwave oven of embodiment 5, the part corresponding with above-mentioned 2nd waveguide 1802 becomes and has The heating chamber of broad space.Wavelength at the microwave of heating indoor propagation is not the wavelength in pipe of waveguide, and becomes micro- The oscillation wavelength of ripple generating unit.Therefore, preferable directional couple state will not be become.Additionally, due to opening 301a The restriction of size, the distance between the opening 301a of each group the most sometimes can not be made to become the 1/4 of wavelength in pipe.But, Even if in this case, as shown in (c) of Figure 16, by with as close possible to the 1/4 of wavelength in pipe λ g The interval of mode reduces and axis of symmetry 601 is adjacent opening 301a, 301a, even if thus such as (d) of Figure 16 The shown central part that heating object 302 is positioned in bottom of heating chamber, it is also possible to suppressed the generation of heating.It addition, Pass through experimental verification and can obtain effect as above.

Even if it addition, reducing and the interval of adjacent opening 301a, the 301a of axis of symmetry 601, in bottom of heating chamber Aperture area near heart portion also will not change.Therefore, even if by heating object 302(big for load such as, putting into 1L water in the cylindrical chamber of diameter 19 centimetres) be placed on the central part of bottom of heating chamber, it is also possible to maintain for The efficiency of heating surface of the heating object 302 that this load is big.

(embodiment 6)

Hereinafter, referring to the drawings the microwave heating equipment of embodiments of the present invention 6 is illustrated.Figure 20 is explanation The opening shape as microwave radiation portion in the microwave heating equipment of embodiments of the present invention 6, such as microwave oven Figure.In the structure of embodiment 6, it is opening shape with the difference of the structure of embodiment 1 to embodiment 5, The structure of other aspect application implementation mode 1 to embodiments 5.

In the microwave heating equipment of embodiment 6, especially to as microwave radiation portion, radiation circularly polarized wave by The opening shape that the elongated hole (slit) of more than at least 2 is constituted describes.

As shown in figure 20, opening 411～417 is made up of the elongated hole of more than 2 respectively.In opening 411～417, As long as the shape that the long limit of at least 1 elongated hole tilts relative to microwave transmission direction (arrow 418).Therefore, Can be the Uncrossed shape of elongated hole as opening 415 and opening 416, it is also possible to be by 3 as opening 414 The shape that individual elongated hole is constituted.

It addition, as the microwave radiation portion of the radiation circularly polarized wave being made up of 2 elongated holes (slit), about opening The condition of optimum shape, can enumerate following 3 points.

1st be each elongated hole long limit a length of waveguide 419 in wavelength in pipe λ g about more than 1/4.

2nd is that 2 elongated holes are mutually perpendicular to and the long limit of each elongated hole tilts (example relative to direction of transfer 418 Such as 45 °).

3rd is using parallel with the direction of transfer 418 of waveguide 419 and by as the opening in microwave radiation portion The straight line at center be axle, the distribution of electric field is the most axisymmetricly.Such as, in the situation transmitting microwave with TE10 pattern Under, electric field using the pipe axle 421(of the centrage of the width 420 as waveguide 419 with reference to Figure 20) for symmetry Axle and symmetrical, therefore optimum condition is arranged to: opening shape about pipe axle 421 the most axisymmetricly, i.e. opening Center be not on pipe axle 421.

Although additionally, figure 20 illustrates the structure that elongated hole (slit) is vertical but it also may out of plumb and tilt Ground constitutes elongated hole, becomes the X font flattened by X word shape in the way of laterally (direction of transfer) is elongated and obtain Shape.In the case of the opening (microwave radiation portion) of the X word shape employed after so flattening, although from positive round It is deformed into ellipse, but also is able to radiate circularly polarized wave, it is possible in the case of the elongated hole not reducing circularly polarized wave opening Make the center end side further towards the width of waveguide of opening.It is as a result, it is possible to main at waveguide The scope of microwave is further expanded on width (direction vertical with direction of transfer).

Additionally, as the opening shape in the structure of embodiments of the present invention 6, as shown in figure 20, can be set to The structure of T shape as L shape, opening 415 as opening 413.Furthermore, it is possible to such as open Mouth 415,416 such each elongated hole of mutually liftoff configurations (slit).Additionally, 2 elongated holes (slit) can not be vertical Straight relation, such as, can tilt about 30 degree and be formed.

Additionally, in the structure of embodiment 6, constitute the elongated hole (slit) as the opening in microwave radiation portion and do not limit In rectangle.Such as, by being constituted the corner of opening portion with curve shape (R) or opening portion is constituted For ellipticity, it is also possible to produce circularly polarized wave.Consideration mode as basic circularly polarized wave opening, it is believed that if group 2 elongated open that unification the longer direction vertical with this direction, direction is shorter.

Industrial applicability

The microwave heating equipment of the present invention can to heating object irradiating microwaves equably, therefore, it is possible to be effectively used in into Row is as the heater etc. adding hot-working or sterilization etc. of the food etc. of heating object.

Claims (11)

1. a microwave heating equipment, it has:

The heating chamber of storage heating object；

Produce the microwave generating unit of microwave；

Transmit the waveguide of microwave；And

From described waveguide to multiple microwave radiation portions of radiated microwaves in described heating chamber,

Standing wave is produced in described waveguide,

The 1st microwave radiation portion in the plurality of microwave radiation portion is configured in the position relative with the antinode of described standing wave Put place,

The 2nd microwave radiation portion adjacent with described 1st microwave radiation portion is configured in and exists with described 1st microwave radiation portion The position of the distance of apart exceed wavelength in pipe on the direction of transfer of described waveguide 1/4 and be less than wavelength in pipe 1/2 Put place.

Microwave heating equipment the most according to claim 1, wherein,

Described 1st microwave radiation portion is configured in and is configured at away from described microwave generating unit in described waveguide The position of the distance of the odd-multiple of the 1/4 of the terminal part of side described wavelength in pipe apart.

Microwave heating equipment the most according to claim 2, wherein,

In the plurality of microwave radiation portion, described 1st microwave radiation portion is configured near described terminal part.

Microwave heating equipment the most according to claim 1, wherein,

The plurality of microwave radiation portion on described direction of transfer with the 1/3 of wavelength in pipe interval and configure.

5. according to the microwave heating equipment described in any one in Claims 1-4, wherein,

Described microwave heating equipment has standing wave stabilizers, described standing wave stabilizers standing wave in making described waveguide Position stable.

Microwave heating equipment the most according to claim 5, wherein,

Described standing wave stabilizers is configured to produce the node of standing wave in described waveguide, and described standing wave stabilizers is joined Be placed in the terminal part of described waveguide on described direction of transfer at a distance of described wavelength in pipe 1/2 integral multiple away from From position.

Microwave heating equipment the most according to claim 6, wherein,

Described direction of transfer is configured with multiple described standing wave with the interval of the integral multiple of the 1/2 of described wavelength in pipe steady Determine portion.

8. according to the microwave heating equipment described in any one in Claims 1-4, wherein,

The plurality of microwave radiation portion is made up of opening respectively, when described opening is to overlook not with the width of described waveguide The mode that the central shaft in direction intersects is formed.

Microwave heating equipment the most according to claim 8, wherein,

The plurality of microwave radiation portion is configured at the both sides of described central shaft symmetrically when overlooking.

10. according to the microwave heating equipment described in any one in Claims 1-4, wherein,

Described microwave radiation portion is made up of the opening shape radiating circularly polarized wave.

11. microwave heating equipments according to claim 10, wherein,

The opening of the X word shape that described microwave radiation portion is intersected by 2 elongated holes is constituted.