CN104186024A - Microwave heating device - Google Patents

Abstract

This microwave heating device is provided with: a heating chamber (103), which contains a subject to be heated; a microwave generating unit (202), which generates microwaves; a waveguide unit (201), which transmits the microwaves; and microwave radiation units (102) which radiate the microwaves to the inside of the heating chamber (103). The device has a plurality of the microwave radiation units in the direction at right angle to the transmission and magnetic field directions of the waveguide unit (201), and the microwave radiation units are configured such that the microwaves radiated from the microwave radiation units spread in the direction at right angle to the transmission and magnetic field directions of the waveguide unit.

Description

Microwave heating equipment

Technical field

The present invention relates to carry out to heating object radiated microwaves the microwave heating equipments such as the microwave oven of dielectric heating, particularly at the characteristic microwave heating equipment of textural tool of microwave radioactive department.

Background technology

As the representative device of by microwave, object being carried out to the microwave heating equipment of heat treated, there is microwave oven.In microwave oven, the microwave producing in microwave generator is emitted to metal heating chamber inside, the object of microwave to heating chamber inside by radiation, heating object carries out dielectric heating.

As the microwave generator of existing microwave oven, use magnetron.The microwave being generated by magnetron emits to heating chamber inside via waveguide.When the electromagnetic field of the microwave of heating chamber inside distributes (microwave distribution) when inhomogeneous, can not carry out microwave heating to heating object equably.

As the means of the heating object of heating chamber inside being carried out to homogeneous heating, generally adopt with the following method: utilize on one side make to load the worktable rotary of heating object and make the structure of heating object rotation, fixing heating object and make the structure of antenna rotation of radiated microwaves or the structure etc. that changes the phase place of the microwave producing from microwave generator by phaser arbitrarily driving mechanism change micro-wave line of propagation of radiating to heating object, heat on one side, thereby realize the homogeneous heating to heating object.

On the other hand, simple in structure in order to make, expect in the situation that not thering is driving mechanism, to carry out the method for homogeneous heating, thus the method for the circularly polarized wave that the plane of polarization that has proposed to utilize electric field rotated according to the time.The dielectric heating originally electric field based on utilizing microwave is realized the principle that has the heating object of dielectric loss and heat, and therefore thinks that to use the circularly polarized wave of electric field rotation effective to the homogenizing heating.

For example, as the production method of concrete circularly polarized wave, as shown in figure 12, in No. 4301347 specification of United States Patent (USP) (patent documentation 1), show the structure of the circularly polarized wave opening 1202 that uses the X font of intersecting on waveguide 1200.In addition, as shown in figure 13, in No. 3510523 communique of Japanese Patent (patent documentation 2), show the opening 1301 that makes on waveguide 1300 to extend along vertical direction two rectangle slit-shaped that arrange toward each other and the structure of configured separate.In addition, as shown in figure 14, in TOHKEMY 2005-235772 communique (patent documentation 3), show following structure: transmission from the waveguide pipe 1400 of the microwave of magnetron 1404 in conjunction with paster antenna 1401, produce circularly polarized waves thereby form otch 1402 at the planar section of this paster antenna 1401.

For example, in existing microwave heating equipment, some microwave heating equipments have following structure: have rotable antenna, antenna axis etc. in waveguide internal configurations, on one side by antenna electrical, this antenna rotation is driven on one side to magnetron, reduce thus inhomogeneous that microwave in heating chamber distributes.

In addition, Japanese kokai publication sho 62-64093 communique (patent documentation 4) has proposed following microwave heating equipment: this microwave heating equipment arranges rotable antenna in the bottom of magnetron, be blown into the blade of this rotable antenna from the cooling air of Air Blast fan, thereby make rotable antenna rotation by the wind-force of Air Blast fan, the microwave changing in heating chamber distributes.

As the example with phaser, in patent documentation 1, record following microwave heating equipment: this microwave heating equipment has reduced the heating inequality of microwave heating to heating object, and realized the space saving of power supply.In patent documentation 1, as shown in figure 12, propose following microwave heating equipment: this microwave heating equipment has revolving phase shifter 1201, and be provided with the single microwave radioactive department 1202 of radiation circularly polarized wave in heating chamber inside.

Prior art document

Patent documentation

Patent documentation 1: No. 4301347 specification of United States Patent (USP)

Patent documentation 2: No. 3510523 communique of Japanese Patent

Patent documentation 3: TOHKEMY 2005-235772 communique

Patent documentation 4: Japanese kokai publication sho 62-64093 communique

Summary of the invention

The problem that invention will solve

In the such microwave heating equipment of the microwave oven of above-mentioned existing structure, require to there is as far as possible simply structure, and require efficiently, equably heating object heated.But, in the existing structure proposing up to now, can not meet these requirements, at aspects such as textural, high efficiency and homogenizing, there is variety of issue.

In addition, in microwave heating equipment, particularly microwave oven, the technological development development of high output, in Japan, commercialization of the product that specified high frequency output is 1000W.Microwave oven is not to be conducted food is heated by heat, and microwave oven is as the notable feature of commodity can the direct convenience that food is heated of working medium heating.But in microwave oven, the high output not yet solving under the state of non-uniform heat flux can cause more obviously this serious problem of non-uniform heat flux.

In described existing structure, as the existing constructional problem of the microwave heating equipment with driving mechanism, can enumerate following 3 points.

First is, need to possess the driving mechanism for making workbench or antenna rotation in order to reduce heating inequality, therefore must guarantee revolution space that workbench or antenna are used and for making the space that arranges that the drive source such as motor of workbench or antenna rotation uses, thereby hinder the miniaturization of microwave heating equipment.

Second point is, rotates in order to make antenna stabilization, this antenna need to be arranged on to top or the bottom of heating chamber, is restricted textural.

Thirdly, owing to thering is the emerging of microwave oven of the various heating functions such as steam heating or Hot-blast Heating, need more structure member in the enclosure interior of microwave oven.In addition, in this microwave oven, because the caloric value of control assembly from enclosure interior etc. is more, thereby just need to guarantee cooling air channel in enclosure interior in order to realize sufficient cooling performance, thereby exist the setting position of waveguide and microwave radioactive department to be restricted, microwave in heating chamber distributes and become inhomogeneous problem.

In addition, in existing microwave heating equipment, lead to rotating mechanism being provided with in space heating chamber, illuminated microwave (radiator (applicator)) workbench or phaser etc., this mechanism arranges the electric discharge phenomena that can cause based on microwave, reduces the reliability of device.Therefore, require in the art to realize the microwave heating equipment that does not need these mechanisms.

About the above-mentioned existing microwave heating equipment that has utilized circularly polarized wave, in patent documentation 1～3, all there is the problem that does not reach the even effect that can not use the such degree of driving mechanism.In any one document of patent documentation 1～3, be all only to have recorded compared with the existing structure only with driving mechanism, can further realize the technology of homogenizing by the cooperative effect of circularly polarized wave and driving mechanism.

Particularly, in the patent documentation 1 shown in Figure 12, there is the rotary body that is known as phase shifter 1201 at the end of waveguide 1200, in the patent documentation 2 shown in Figure 13, there is the turntable for rotating heating object, in the patent documentation 3 shown in Figure 14, recorded the structure that also makes paster antenna 1401 rotations be used as mixer except turntable 1403.As mentioned above, if all do not record the situation that uses circularly polarized wave Ze Bu demand motive mechanism in any one of patent documentation 1～3.Its reason is, do not arrange driving mechanism in the case of only relying on the circularly polarized wave radiating from single microwave radioactive department, with there is the structure of general driving mechanism, for example, make the structure of the worktable rotary that loads heating object or make compared with the situation of structure etc. of antenna rotation, the stirring of microwave is insufficient, and therefore uniformity is poor.

In addition, the existing microwave heating equipment of patent documentation 4 is the structures by make rotable antenna rotation from the cooling air of Air Blast fan, and rotating mechanism is arranged in radiator.Thereby, reduce the reliability of device, and also had problems aspect the homogenizing that distributes of microwave in heating chamber.

The object of the invention is to solve the problem in above-mentioned existing microwave heating equipment, provide a kind of can be in the situation that not using driving mechanism the microwave heating equipment to heating object homogeneous heating.Especially as shown in Figure 12 and Figure 13, in the case of from the opening radiation circularly polarized wave of waveguide, due to cannot be at the width arranged outside opening of waveguide, because of but microwave cannot be extended to than the structure in the width of waveguide region in the outer part.And in the present invention, provide a kind of microwave that can make to expand on the Width of waveguide, and structure that can homogeneous heating heating object.

For the means of dealing with problems

In order to solve the problem in above-mentioned existing microwave heating equipment, microwave heating equipment of the present invention is configured to be had:

The heating chamber of storage heating object;

Produce the microwave generating unit of microwave;

The waveguide portion of transmission microwave; And

To the microwave radioactive department of radiated microwaves in described heating chamber,

With the transmission of described waveguide portion and the rectangular direction of direction of an electric field (Width of waveguide portion) on there are multiple described microwave radioactive departments.

Microwave heating equipment of the present invention is configured to as constructed as above, from along with the transmission of waveguide portion and multiple microwave radioactive departments of the rectangular direction alignment arrangements of direction of an electric field to radiated microwaves in heating chamber.Therefore, in microwave heating equipment of the present invention, microwave is above being expanded with transmission and the rectangular direction of direction of an electric field (Width of waveguide portion) of waveguide portion, can also be to heating chamber inside than the width of waveguide portion region radiated microwaves in the outer part, thus even if do not use driving mechanism can make the heat distribution that adds of heating object become even yet.

The effect of invention

In microwave heating equipment of the present invention, from along with multiple microwave radioactive department radiated microwaves of the transmission of waveguide portion and the rectangular direction configuration of direction of an electric field, thereby microwave with the transmission of waveguide portion and the rectangular direction of direction of an electric field on expand, can also be to than the width of waveguide region radiated microwaves in the outer part, thus can in the situation that not using driving mechanism, make the heat distribution that adds of heating object become even.

Brief description of the drawings

Fig. 1 is the integrally-built stereogram that the microwave heating equipment of embodiments of the present invention 1 is shown.

Fig. 2 is the end view of the relation between the electric field in vertical view and explanation microwave radioactive department and the waveguide portion of waveguide portion, microwave radioactive department and heating chamber that embodiments of the present invention 1 are shown.

Fig. 3 is the figure of relation between electric field, magnetic field and the transmission direction in the waveguide portion of explanation embodiments of the present invention 1.

Fig. 4 is the figure of relation between electric field, magnetic field, current phase and the microwave radioactive department in the waveguide portion of explanation embodiments of the present invention 1.

Fig. 5 is the figure of the relation between phase place and the directive property of microwave of radiating from microwave radioactive department of the electric field in the waveguide portion of explanation embodiments of the present invention 1.

Fig. 6 is the end view of the relation between the electric field in vertical view and explanation microwave radioactive department and the waveguide portion of waveguide portion, microwave radioactive department and heating chamber that embodiments of the present invention 2 are shown.

Fig. 7 is the end view of the relation between the electric field in vertical view and explanation microwave radioactive department and the waveguide portion of waveguide portion, microwave radioactive department and heating chamber that embodiments of the present invention 3 are shown.

Fig. 8 is the figure of the relation between phase place and the directive property of microwave of radiating from microwave radioactive department of the electric field in the waveguide portion of explanation embodiments of the present invention 3.

Fig. 9 is the end view of the relation between the electric field in vertical view and explanation microwave radioactive department and the waveguide portion of waveguide portion, microwave radioactive department and heating chamber that embodiments of the present invention 4 are shown.

Figure 10 is the end view of the relation between the electric field in vertical view and explanation microwave radioactive department and the waveguide portion of waveguide portion, microwave radioactive department and heating chamber that embodiments of the present invention 5 are shown.

Figure 11 is the figure of the shape example of the microwave radioactive department of explanation embodiments of the present invention 5.

Figure 12 is the structure chart that produces the existing microwave heating equipment of circularly polarized wave by the opening of X font.

Figure 13 is the structure chart that produces the existing microwave heating equipment of circularly polarized wave by two orthogonal rectangle slits.

Figure 14 is the structure chart that produces the existing microwave heating equipment of circularly polarized wave by paster antenna.

Embodiment

The microwave heating equipment of the 1st mode of the present invention is configured to be had:

The heating chamber of storage heating object;

Produce the microwave generating unit of microwave;

The waveguide portion of transmission microwave; And

To the microwave radioactive department of radiated microwaves in described heating chamber,

With the transmission of described waveguide portion and the rectangular direction of direction of an electric field on there are multiple described microwave radioactive departments.

The microwave heating equipment of the 1st mode of the present invention is configured to as constructed as above, from along with the transmission of waveguide portion and multiple microwave radioactive departments of the rectangular direction alignment arrangements of direction of an electric field to radiated microwaves in heating chamber.Therefore, in microwave heating equipment of the present invention, microwave is above being expanded with transmission and the rectangular direction of direction of an electric field (Width of waveguide portion) of waveguide portion, microwave also can be emitted to heating chamber inside than the width of waveguide portion region in the outer part, even if do not use driving mechanism also can make the heat distribution that adds of heating object become even.

In the microwave heating equipment of the 2nd mode of the present invention, the center of at least 2 described microwave radioactive departments of described the 1st mode is configured in the position corresponding with the roughly anti-node location of the electric field in described waveguide portion.The microwave heating equipment of the 2nd mode of the present invention forming is like this configured to, the roughly anti-node location place of the microwave in waveguide portion disposes microwave radioactive department, thereby is further expanding with transmission and the rectangular direction of direction of an electric field of waveguide portion from the microwave of microwave radioactive department radiation.

In the microwave heating equipment of the 3rd mode of the present invention, the center of at least 2 described microwave radioactive departments of described the 1st mode or the 2nd mode is configured in the position of the roughly the same phase place of the electric field in described waveguide portion.The microwave heating equipment of the 3rd mode of the present invention forming is like this configured to, and dies down from ground wave the cancelling out each other each other of the microwave radioactive department that is configured in roughly the same phase place place, can carry out more effective heating.

In the microwave heating equipment of the 4th mode of the present invention, the center of at least 2 described microwave radioactive departments of any one mode in described the 1st mode to the 3 modes is configured in the axisymmetric position, the center that is parallel to transmission direction about described waveguide portion in relative mode.The microwave heating equipment of the 4th mode of the present invention forming is like this configured to, and is expanding, and further radiate reliably the microwave as circularly polarized wave from the microwave of microwave radioactive department radiation with transmission and the rectangular direction of direction of an electric field of waveguide portion.

In the microwave heating equipment of the 5th mode of the present invention, in the transmission direction of the described waveguide portion of described the 2nd mode, the center of at least 1 described microwave radioactive department is approximately 1/4 odd-multiple of wavelength in pipe in described waveguide portion to the distance of the terminal part of described waveguide portion.The microwave heating equipment of the 5th mode of the present invention forming is like this configured to, and is expanding with transmission and the rectangular direction of direction of an electric field of waveguide portion from the microwave of microwave radioactive department radiation.

In the microwave heating equipment of the 6th mode of the present invention, in the described waveguide portion of described the 2nd mode, there is the matching part of at least 1 impedance adjustment use, in the transmission direction of described waveguide portion, the center of at least 1 described microwave radioactive department is approximately 1/4 odd-multiple of wavelength in pipe in described waveguide portion to the distance of described matching part.The microwave heating equipment of the 6th mode of the present invention forming is like this configured to, the center of microwave radioactive department is disposed at the roughly anti-node location of electric field reliably, is expanding with transmission and the rectangular direction of direction of an electric field of waveguide portion from the microwave of microwave radioactive department radiation.

In the microwave heating equipment of the 7th mode of the present invention, in the described waveguide portion of described the 2nd mode, there is the matching part of at least 1 impedance adjustment use, in the transmission direction of described waveguide portion, and the terminal part of described matching part and described waveguide portion between the center that disposes at least 1 described microwave radioactive department, corresponding position.The microwave heating equipment of the 7th mode of the present invention forming is like this configured to, and the center of microwave radioactive department is configured in the roughly anti-node location place of electric field, is expanding with transmission and the rectangular direction of direction of an electric field of waveguide portion from the microwave of microwave radioactive department radiation.

In the microwave heating equipment of the 8th mode of the present invention, in the described waveguide portion of described the 2nd mode, there is the matching part of at least 2 impedance adjustment use, in the transmission direction of described waveguide portion, with adjacent described matching part between the center that disposes at least 1 described microwave radioactive department, corresponding position.The microwave heating equipment of the 8th mode of the present invention forming is like this configured to, and the center of microwave radioactive department is configured in the roughly anti-node location place of electric field, is expanding with transmission and the rectangular direction of direction of an electric field of waveguide portion from the microwave of microwave radioactive department radiation.

In the microwave heating equipment of the 9th mode of the present invention, in the transmission direction of the described waveguide portion of described the 2nd mode, the center of at least 1 described microwave radioactive department is approximately 1/2 integral multiple of wavelength in pipe in described waveguide portion to the distance of the efferent of described microwave generating unit.The microwave heating equipment of the 9th mode of the present invention forming is like this configured to, and the center of microwave radioactive department is configured in the roughly anti-node location place of electric field, is expanding with transmission and the rectangular direction of direction of an electric field of waveguide portion from the microwave of microwave radioactive department radiation.

The microwave heating equipment of the 10th mode of the present invention is configured to, at least 1 described microwave radioactive department radiation circularly polarized wave in described the 1st mode to the 9 modes.The microwave heating equipment of the 10th mode of the present invention forming is like this configured to, from microwave radioactive department radiation circularly polarized wave, thus can be along circumferentially the heating object on microwave radioactive department being heated uniformly.

The preferred implementation of microwave heating equipment of the present invention is described with reference to accompanying drawing below.In addition, although microwave oven is described in the microwave heating equipment of following execution mode, but microwave oven just illustrates, microwave heating equipment of the present invention is not limited to microwave oven, also comprises and has utilized the microwave heating equipments such as heater, garbage disposer or the semiconductor-fabricating device of dielectric heating.In addition, the invention is not restricted to the concrete structure of following execution mode, the structure of the technological thought based on same is also contained in the present invention.

(execution mode 1)

Fig. 1～Fig. 5 is the key diagram relevant to the microwave oven of the microwave heating equipment as embodiments of the present invention 1.

Fig. 1 is the integrally-built stereogram illustrating as the microwave oven 101 of the microwave heating equipment of execution mode 1.(a) of Fig. 2 is the figure with respect to the position relationship of heating chamber 103 of the waveguide portion 201 of explanation in microwave heating equipment 101, microwave radioactive department 102, microwave generating unit 202.(b) of Fig. 2 be the microwave radioactive department 102 of explanation in waveguide portion 201, figure at phase place (the generation state of electric field 401), the terminal part 203 of waveguide portion 201 and the position relationship of microwave generating unit 202 of the standing wave 204 of waveguide portion 201 interior generations.Fig. 3 is the figure of the relation between size and the transmission mode for common rectangular waveguide 301 is described.Fig. 4 is the figure for the relation between electric field 401, magnetic field 402 and the electric current 403 of the waveguide portion 201 interior generations of rectangle is described.(a) of Fig. 4 illustrates the magnetic field 402 of waveguide portion 201 of rectangle and the plane graph of the state of electric current 403, and (b) of Fig. 4 is the end view that the relation between electric field 401 and the microwave radioactive department 102 of waveguide portion 201 of rectangle is shown.(a) of Fig. 5 is in waveguide portion 201 inside for explanation, from the figure of the relation between the distance of terminal part 203 and the phase place of standing wave (electric field 401), (b) of Fig. 5 is for illustrating in the position that is provided with microwave radioactive department 102, the figure that the expansion of the microwave radiating changes according to the phase state of the standing wave in waveguide portion 201.Result shown in Fig. 5 is obtained by electromagnetic field analysis.

The microwave oven 101 of execution mode 1 have can receive heating object heating chamber 103, produce the microwave generating unit 202 of microwave, the microwave radiating from microwave generating unit 202 guided to the waveguide portion 201 of heating chamber 103, the microwave in the waveguide portion 201 of the H face of waveguide portion 201 (with reference to the H face 302 of the waveguide 301 of Fig. 3) setting is emitted to the multiple microwave radioactive departments 102 in heating chamber 103.

As shown in Figure 1, microwave oven 101 has the door 105 that hides the top of microwave radioactive department 102 and load the mounting table 104 of heating object (not shown) and put into for the taking-up of heating object.In execution mode 1, mounting table 104 is held meable material by microwaves such as glass or potteries and is formed.

In addition, by making microwave generating unit 202 adopt magnetron, waveguide portion 201 to adopt rectangular waveguide 301, microwave radioactive department 102 to adopt the peristome that is arranged at waveguide portion 201, can be easy to realize said structure.

First summary action as the microwave oven 101 of the microwave heating equipment of execution mode 1 is described.When user is placed on heating object in the mounting table 104 in heating chamber 103, and this microwave oven 101 is carried out to heating while starting to indicate, in microwave oven 101, in waveguide portion 201, provide microwave from the magnetron as microwave generating unit 202.In from microwave generating unit 202 to waveguide portion 201, provide microwave, via the microwave radioactive department 102 that heating chamber 103 and waveguide portion 201 are linked to the interior radiated microwaves of heating chamber 103.Its result is carried out the heating to heating object in microwave oven 101.

In addition, in explanation of the present invention, will radiate and the direct-fired microwave of heating object is called to ground wave from microwave radioactive department 102, the microwave after the reflections such as the inwall of heated chamber 103 be called reflected wave.

Then, illustrate as the rectangular waveguide 301 of representative waveguide portion 201 that is equipped on microwave oven with Fig. 3.As shown in Figure 3, the simplest common waveguide is that (width a × height b) extends along transmission direction 207 rectangular waveguide 301 that the cuboid that forms forms by making fixing rectangle cross section.In the rectangular waveguide 301 of this structure, be known that, in the time establishing the wavelength of the microwave that this rectangular waveguide 301 is provided and be λ, by select the width a of waveguide in the scope of λ > a > λ/2, select height b in the scope of b < λ/2, thereby microwave transmits in waveguide with TE10 pattern.

TE10 pattern refers in the waveguide 301 of rectangle, in transmission direction 207, only there is the composition in magnetic field 402 and do not exist electric field 401 composition, H ripple (TE ripple; H mode transmission Transverse Electric Wave) in transmission mode.In addition, substantially the transmission mode beyond TE10 pattern is not applied to the waveguide portion 201 of microwave oven 101.

In microwave oven 101, the wavelength X that is provided to the microwave in waveguide portion 201 from microwave generating unit 202 is about 120mm, and as waveguide portion 201, conventionally large more options width a is 80～100mm, and height b is 15～40mm left and right.

Now, the upper and lower face of Fig. 3 refers to magnetic field 402 face of vortex abreast therein, is called H face 302, and the face of left and right refers to the face parallel with electric field 401, is called E face 303.In addition, wavelength table when microwave is transmitted in waveguide is shown wavelength in pipe λ g, and λ g=λ/√ (1-(λ/(2 × a)) ^2), wavelength in pipe λ g changes according to the size of width a, but determining with the size of height b of wavelength in pipe λ g is irrelevant.In addition, " ^2 " is for performance square.

In addition,, in TE10 pattern, in the two ends (E face 303) of the Width of waveguide portion 201, electric field 401 is 0, in centre electric field 401 maximums of Width.Therefore, be configured to the central authorities of the Width of the waveguide portion 201 of electric field 401 maximums and be combined as the efferent of the magnetron of microwave generating unit 202.

Then, as shown in Figure 2, in the situation that using rectangular waveguide 301 (with reference to Fig. 3) as waveguide portion 201, interfere with each other from the row ripple of microwave generating unit 202 and the reflected wave of the terminal part 203 places reflection in waveguide portion 201, thereby at the interior generation standing wave 204 of waveguide portion 201.

In addition, according to being provided with the phase state of standing wave 204 position, the 201 interior generations of waveguide portion (electric field 401) of microwave radioactive department 102, the extended mode that emits to the microwave of heating chamber 103 from waveguide portion 201 changes.The principle that the expansion of this microwave changes is below described.

First, with Fig. 4, the relation between electric field 401, magnetic field 402 and the electric current 403 in standing wave 204 is described.Be expert in ripple, electric field 401 differs 90 ° with the direction in magnetic field 402, and phase place is identical.On the other hand, in standing wave 204, electric field 401 differs 90 ° with the direction in magnetic field 402, and phase place differs pi/2.Therefore, having produced electric field 401 in the waveguide portion 201 of standing wave 204 and the relation between magnetic field 402 becomes shown in Fig. 4.Its main cause is, the in the situation that of standing wave 204, row ripple, at terminal part 203 places of waveguide portion 201, reflex times, 180 ° of the phase deviations of electric field 401 occurs.In addition, electric current 403 on the surface of waveguide portion 201 along flowing through with the orthogonal direction in magnetic field 402.

The directive property of the microwave for be formed with microwave radioactive department 102 on the H face (the H face 302 of the rectangular waveguide 301 shown in Fig. 3) of waveguide portion 201 that has produced standing wave 204 time is carried out principle explanation below.

To as shown in Figure 4 in the standing wave 204 of waveguide portion 201 interior generations, in anti-node location 205 roughly and the situation that roughly 206 places, node position are formed with microwave radioactive department 102 describe.When consider microwave radioactive department 102 electric current 403 transmission direction 207 composition and during with the composition of transmission and the rectangular direction 209 of direction of an electric field, in the electric current 403 of the microwave radioactive department 102 that roughly anti-node location 205 places form, more with the composition of transmission and the rectangular direction 209 of direction of an electric field.Therefore, the flow direction of electric current 403 is identical with the propagation direction of electric field 401, thus the microwave that emits to heating chamber 103 from waveguide portion 201 with transmission and rectangular direction 209 expansions of direction of an electric field.

On the other hand, in the electric current 403 of the microwave radioactive department 102 that roughly 206 places, node position form, the composition of transmission direction 207 is more.Therefore, the microwave that emits to heating chamber 103 from waveguide portion 201 becomes in transmission direction 207 expansions, and not with transmission and the rectangular direction 209 of direction of an electric field on the state of expansion.

Then, Fig. 5 show be provided with microwave radioactive department 102 standing wave 204 position, in waveguide portion 201 electric field 401 phase place and emit to the relation between the expansion of microwave of heating chamber 103 from waveguide portion 201.In addition, Fig. 5 obtains by electromagnetic field analysis.

In Fig. 5, the node position of standing wave 204 is made as to 0 °, phase place, 180 °, 360 °, anti-node location is made as to 90 ° and 270 °, obtains the distribution of the microwave radiating from microwave radioactive department 102 from about 0 ° to the about 180 ° every 45 ° ground of phase place by electromagnetic field analysis.In addition, in this analysis, by changing the distance from the terminal part 203 of waveguide portion 201 to microwave radioactive department 102 center, in the position that is provided with microwave radioactive department 102, change the phase place of the electric field 401 of the standing wave 204 in waveguide portion 201.In addition, the λ g in Fig. 5 represents the wavelength in pipe in waveguide portion 201.

As shown in Fig. 5 (b), phase place is in the situation of about 0 ° (the roughly node position 206 of (b) of Fig. 4), illustrates similarly to have the expansion of transmission direction 207 with above-mentioned principle.On the other hand, by making approximately 45 ° of phase shiftings (λ g/8), the directive property of microwave is passed in the counterclockwise direction, be about 90 ° (the roughly anti-node location 205 of Fig. 4 (b)) in phase place, with transmission and the rectangular direction 209 of direction of an electric field on there is the expansion of microwave.This is also consistent with above-mentioned principle explanation.

As mentioned above, by microwave radioactive department 102 being arranged to the roughly anti-node location 205 in waveguide portion 201, can make microwave expand to than the region of the width more lateral of waveguide portion 201, can be to the heating object homogeneous heating in heating chamber 103.

Then, below record the analysis condition of the analysis result shown in Fig. 5.In this analysis, the microwave that uses the rectangular waveguide 301 shown in Fig. 3 to produce from the magnetron as microwave generating unit using TE10 mode transfer.

Rectangular waveguide 301 in this analysis is of a size of 30mm on direction of an electric field 208, with transmission and the rectangular direction 209 of direction of an electric field on be of a size of 100mm, will be made as 2.46GHz for micro-wave frequency of analyzing.

In addition, the displacement that makes 90 ° of required microwave radioactive departments 102 of propagation direction change of microwave is only about half of (the approximately λ g/2) of wavelength in pipe, is 2.46GHz for micro-wave frequency of analyzing.Therefore, making the displacement of 90 ° of required microwave radioactive departments 102 of propagation direction change of microwave is about 60mm.

In addition, the shape of the microwave radioactive department 102 using in this analysis is configured to: make 2 slits orthogonal in the centre of each slit, make each slit tilt 45 ° with respect to transmission direction 207.

In addition, the quantity of microwave radioactive department 102 is 1, and the length of each slit is 55mm, and the demonstration data of Fig. 5 (b) are effective radiant powers.

Then the node position of the electric field 401 in waveguide portion 201 is described.In the case of the interior transmission microwave of the waveguide portion 201 with terminal part 203 shown in Fig. 2, be formed with standing wave 204 along the transmission direction 207 of microwave.Waveguide portion 201 is sealed by terminal part 203, and therefore the amplitude at terminal part 203 places is 0.At the supply side (efferent) of microwave generating unit 202, as shown in Fig. 2 (b), become the free end that shows amplitude maximum, thereby the length that can use the transmission direction 207 of the microwave of Fig. 2 is c and represents the natural number s of standing wave mode, obtain the wavelength of the standing wave 204 of waveguide portion 201 interior generations by following formula (1) computing easily.

[formula 1]

$\mathrm{\&lambda;s}=\frac{4c}{2s-1}---\left(1\right)$

For example, if establishing the length c of the transmission direction 207 of microwave is 275mm, the frequency of oscillation ν at the wavelength X s place of the node interval of the wavelength X s of standing wave 204, standing wave 204 (λ s/2) and standing wave 204 is respectively that shown in following table (1), (υ=(light velocity)/λ s).

[table 1]

[mm] [GHz] [mm]

s	λs	v	λs/2
				1	1100.0	0.27	550.0
2	366.7	0.82	183.4
				3	220.0	1.36	110.0
4	157.1	1.91	78.6
				5	122.2	2.45	61.1
6	100.0	3.00	50.0

Table 1

Wherein, be present in the ripple that standing wave 204 in waveguide portion 201 is frequencies of oscillation of providing based on microwave generating unit 202.Therefore, be 2.45GHz in the frequency of oscillation of microwave generating unit 202, the quantity that is present in the standing wave 204 in waveguide portion 201 is easy to exist the value close with the frequency of microwave generating unit 202.Therefore,, according to described table 1, exist the node interval (λ s/2) of s=5 and standing wave 204 for the standing wave 204 of 61.1mm.In addition, the anti-node location of standing wave 204 is present in the centre of adjacent node.

But, in actual waveguide portion, cannot reach perfect condition at the entrance state (state of shape, structure etc.) of supply side (efferent) of microwave generating unit and the state of the terminal part of waveguide portion, also can get the upper and lower value of operation values (being now s=4, s=6), if thereby think to obtain reliably the wavelength X s of standing wave 204 in fact accurately, need the amplitude in actual measurement waveguide portion.

Then explanation emits to the interference of the microwave of heating chamber 103 from waveguide portion 201 through microwave radioactive department 102.

The mutual interference of the microwave at arbitrfary point place is to determine by the propagation direction of the microwave from each microwave radioactive department 102 with to the wavelength of the microwave in difference and the heating chamber 103 of the distance of arbitrfary point.In addition, when 1/2 even-multiple (comprising 0) of the wavelength in heating chamber 103, mutually strengthen, in the time of odd-multiple, mutually weaken.The micro-wave frequency 2.45GHz adopting at common microwave oven 101, the airborne wavelength of the interior grade of heating chamber 103 is about 120mm.

In the structure shown in Fig. 2, be formed with multiple microwave radioactive departments 102 at anti-node location 205 places roughly, radiate respectively possessing the microwave of expansion with transmission and the rectangular direction 209 of direction of an electric field, in the interior mutual interference of heating chamber 103 from each microwave radioactive department 102.

Illustrate from only thering is distance and be configured in the interference of the microwave that roughly 2 microwave radioactive departments 102 of anti-node location 205 radiate respectively with transmission and the rectangular direction 209 of direction of an electric field herein.Each microwave radioactive department 102 is configured in roughly anti-node location 205, is possessing divergence with transmission and the rectangular direction 209 of direction of an electric field, thus can with transmission and the rectangular direction 209 of direction of an electric field on strongly produce interfere.But, the expansion of the composite wave of the microwave radiating from these 2 microwave radioactive departments 102 still in transmission and the rectangular direction 209 of direction of an electric field.

Similarly, about with transmission and the rectangular direction 209 of direction of an electric field and transmission direction 207 on there is distance and be configured in roughly multiple microwave radioactive departments 102 at anti-node location 205 places, the expansion of the composite wave of the microwave radiating from microwave radioactive department 102 be also still in transmission and the rectangular direction 209 of direction of an electric field.

The following describes concrete structure, effect as the microwave oven 101 of the microwave heating equipment of embodiment of the present invention 1.

As shown in Figure 2, multiple microwave radioactive department 102 center of the microwave heating equipment of execution mode 1 is configured in and is parallel to axisymmetric position, transmission direction 207 center about waveguide portion 201 in relative mode.

Here, microwave heating equipment of the present invention be not must be as shown in Figure 2 structure such, by multiple microwave radioactive department 102 center of microwave heating equipment with relative mode be configured in about waveguide portion 201 be parallel to axisymmetric position, transmission direction 207 center, as long as along configuring multiple microwave radioactive departments 102 with transmission and the rectangular direction 209 of direction of an electric field (Width) of waveguide portion 201.For example, in a side's that, can divide at the central shaft parallel with transmission direction 207 of waveguide portion 201 region, configure multiple microwave radioactive departments 102.In addition, in a side's that can also divide at the central shaft parallel with transmission direction 207 of waveguide portion 201 region, configure multiple microwave radioactive departments 102, in the opposing party's region, configure 1 microwave radioactive department 102.

In addition, as shown in Figure 2, multiple microwave radioactive departments 102 of the microwave heating equipment of execution mode 1 are configured to central authorities' 210 point symmetries about heating chamber 103.Across waveguide portion 201, and the parallel central shaft of transmission direction 207 and distance between relative 2 microwave radioactive departments 102 is set to, and distance between the approaching microwave radioactive department 102 of the central authorities 210 of heating chamber 103 approach distance between the microwave radioactive department 102 of wall of heating chamber than away from the central authorities 210 of heating chamber 103 short.

In addition, as mentioned above, as shown in Fig. 2 (b), the supply side (efferent) of microwave generating unit 202 becomes the free end that shows amplitude maximum, thereby is anti-node location 205 roughly.Therefore, from the efferent of microwave generating unit 202 till the position of approximately 1/2 the integral multiple of the wavelength in pipe λ g of distance microwave radioactive department 102 center, on transmission direction 207 in waveguide portion 201, microwave radioactive department 102 is arranged at roughly anti-node location 205.In the structure of execution mode 1, configure all microwave radioactive departments 102 to become the mode of above-mentioned distance.In addition, microwave radioactive department 102 center represents the practical center position of the radiation mouth of microwave, for example, be made up of microwave radioactive department 102 opening in the situation that, if supposition forms its opening shape with the sheet material of same thickness, microwave radioactive department 102 center represents the position of centre of gravity of this sheet material.

Therefore, in the structure of execution mode 1, utilization is configured in roughly multiple microwave radioactive departments 102 at anti-node location 205 places, can make microwave with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on expansion, can be to heating object homogeneous heating in the situation that not using driving mechanism.

In addition, microwave heating equipment of the present invention be not must be as shown in Figure 2 structure such, all microwave radioactive departments 102 are all disposed to roughly anti-node location 205, as long as at least 2 microwave radioactive departments 102 are disposed to the roughly structure of anti-node location 205, just can play the effect same with the structure of execution mode 1, such structure is also contained in the present invention.

In addition, in microwave heating equipment of the present invention, the quantity of microwave radioactive department and configuration are not limited to the structure of execution mode 1, can consider that specification, the structure etc. of microwave heating equipment suitably set.In addition, in the case of the configuration of microwave radioactive department about the asymmetric situation of central authorities 210 (with reference to Fig. 2) of heating chamber and microwave radioactive department be shaped as beyond the rectangle shown in Fig. 2, also can play same effect, such configuration and shape are also contained in the present invention.

(execution mode 2)

Then, with Fig. 6, the microwave oven as the microwave heating equipment of embodiment of the present invention 2 is described.Fig. 6 is the key diagram relevant to the microwave oven of the microwave heating equipment as execution mode 2.In Fig. 6, give identical numbering to the expression function identical with above-mentioned execution mode 1 essence, the part of action.In addition, the elemental motion of execution mode 2 is identical with the elemental motion of execution mode 1, therefore in execution mode 2 as main its action and effect to be described with the difference of execution mode 1.

Fig. 6 is the figure of explanation microwave radioactive department 102 and the position relationship between terminal part 203 and the microwave generating unit 202 of the position relationship between the phase place of the standing wave (electric field 401) of waveguide portion 201 interior generations and waveguide portion 201.(a) of Fig. 6 is explanation waveguide portion 201, microwave radioactive department 102, microwave generating unit 202 plane graph with respect to the position relationship of the heating chamber 103 of microwave heating equipment 101.(b) of Fig. 6 be the microwave radioactive department 102 of explanation in waveguide portion 201, the end view of position relationship between terminal part 203 and the microwave generating unit 202 of the phase place (the generation state of electric field 401) of the standing wave 204 of waveguide portion 201 interior generations, waveguide portion 201.

There is the waveguide portion 201 of the heating chamber 103 of storage heating object, the microwave generating unit 202 that produces microwave, transmission microwave, microwave radioactive department 102 to heating chamber 103 interior radiated microwaves as the microwave oven 101 of the microwave heating equipment of execution mode 2.The microwave radioactive department 102 of execution mode 2 is configured to, with only with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field (Width) on there is the mode of distance, dispose multiple.In addition, each microwave radioactive department 102 is positioned at the roughly the same phase bit position of the electric field 401 of waveguide portion 201, and is configured in roughly anti-node location 205.

In addition, as mentioned above, as shown in Fig. 6 (b), because the amplitude at terminal part 203 places of waveguide portion 201 is 0, thereby terminal part 203 is in node position 206 roughly.Therefore, from the terminal part 203 of waveguide portion 201 till distance microwave radioactive department 102 center, on transmission direction 207 is the length of approximately 1/4 the odd-multiple of wavelength in pipe λ g in waveguide portion 201, microwave radioactive department 102 center is in anti-node location 205 roughly.In the structure of execution mode 2, each microwave radioactive department 102 is as above configured to: be the length of approximately 1/4 the odd-multiple of wavelength in pipe λ g in waveguide portion 201 from the length of terminal part 203.

As used Fig. 4 illustrated in above-mentioned execution mode 1, even if microwave radioactive department 102 is in anti-node location 205 roughly, but in the time that the phase place of the electric field 401 in waveguide portion 201 is different, the opposite direction in electric field 401 and magnetic field 402, so the propagation direction of microwave is also contrary.Therefore, in the structure of microwave radioactive department 102, by according to the roughly the same phase place of the electric field of waveguide portion 201 401 and at least 2 microwave radioactive departments 102 of the 205 places' configurations of anti-node location roughly, compare from phase place according to different and in the situation of at least 2 microwave radioactive departments 102 of anti-node location 205 places' configurations roughly, can heat more uniformly.In addition, in waveguide portion 201, roughly anti-node location 205 and roughly node position 206 can temporal evolution and occurs significantly to change, only the direction in electric field 401 and magnetic field 402 is reversed according to every half period.

As mentioned above, in the microwave heating equipment of execution mode 2, utilize along that configure with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field, be positioned at roughly the same phase bit position and be configured in roughly multiple microwave radioactive departments 102 at anti-node location 205 places, can make microwave with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on expansion.Therefore, in the microwave heating equipment of execution mode 2, can be in the situation that not using driving mechanism, to heating object homogeneous heating.

In addition, in microwave heating equipment of the present invention, be not must be as shown in Figure 6 structure such, all microwave radioactive departments are all disposed to roughly the same phase bit position and are disposed at roughly anti-node location, as long as at least 2 microwave radioactive departments being disposed to roughly the same phase bit position and being disposed at the roughly structure of anti-node location, just can play the effect same with the structure of execution mode 2, such structure comprises in the present invention.

In addition, in microwave heating equipment of the present invention, the quantity of microwave radioactive department and configuration are not limited to the structure of execution mode 2, can consider that specification, the structure etc. of microwave heating equipment suitably set.In addition, in the case of the configuration of microwave radioactive department about the asymmetric situation of central authorities 210 (with reference to Fig. 6) of heating chamber and microwave radioactive department be shaped as beyond ellipse as shown in Figure 6, also can play same effect, such configuration and shape are also contained in the present invention.

(execution mode 3)

Then, with Fig. 7 and Fig. 8, the microwave oven as the microwave heating equipment of embodiment of the present invention 3 is described.Fig. 7 is the key diagram relevant to the microwave oven of the microwave heating equipment as execution mode 3 with Fig. 8.In Fig. 7 and Fig. 8, give identical numbering to the expression function identical with above-mentioned execution mode 1 and execution mode 2 essence, the part of action.In addition, the elemental motion of execution mode 3 is identical with the elemental motion of execution mode 1 and execution mode 2, therefore in execution mode 3 as main its action and effect to be described with the difference of other execution modes.

Fig. 7 is figure in the microwave heating equipment of explanation execution mode 3, microwave radioactive department 102 and the position relationship between the matching part 701 of terminal part 203, microwave generating unit 202 and the impedance adjustment use of the position relationship between the phase place of the standing wave (electric field 401) of waveguide portion 201 interior generations and waveguide portion 201.(a) of Fig. 7 is the waveguide portion 201 of explanation in microwave heating equipment 101, microwave radioactive department 102, microwave generating unit 202 plane graph with respect to the position relationship of heating chamber 103.(b) of Fig. 7 be the microwave radioactive department 102 of explanation in waveguide portion 201, the end view of position relationship between terminal part 203, matching part 701 and the microwave generating unit 202 of the phase place (the generation state of electric field 401) of the standing wave 204 of waveguide portion 201 interior generations, waveguide portion 201.

As shown in Fig. 7 (a), as the shape of the microwave radioactive department 102 of the microwave oven 101 of execution mode 3, there is the shape that 2 slits are intersected.Therefore, the microwave radioactive department 102 of execution mode 3 is configured to heating chamber 103 and radiates circularly polarized wave.

(a) of Fig. 8 is the figure for the relation the phase place of the standing wave (electric field 401) in illustrating from the matching part 701 of impedance adjustment use to distance and the waveguide portion 201 at microwave radioactive department 102 center.(b) of Fig. 8 is for illustrating in the position that is provided with microwave radioactive department 102, the figure that the directive property of the microwave radiating changes according to the phase state of the standing wave in waveguide portion 201 (electric field 401).Result shown in Fig. 8 is obtained by electromagnetic field analysis.

First the matching part 701 of the impedance adjustment use using in the microwave heating equipment of execution mode 3 is described.

As shown in Figure 7,206 places, roughly node position in waveguide portion 201 have configured behind matching part 701, and amplitude is 0 in the position of matching part 701, forms reliably the roughly node position 206 of the electric field 401 of the phase place of standing wave 204 at 701 places, matching part.In execution mode 3, use the metal of drum as matching part 701, its metal covering performance effect same with stiff end.

Therefore, by matching part 701 being disposed to the roughly node position 206 of electric field 401, even at the state that produces the Electric Field Distribution distortion in waveguide portion 201 from microwave radioactive department 102 to the interior radiated microwaves of heating chamber 103, then again form in the process that consistent electric field in waveguide portion 201 distributes, also can waveguide portion 201 interior by anti-node location 205 roughly and roughly node position 206 be fixed on stable position.In addition, as the factor of the Electric Field Distribution distortion in waveguide portion 201, can also enumerate the microwave of locating reflection at the inwall of heating chamber 103 etc. and turn back to the situation in waveguide portion 201 by microwave radioactive department 102.Even if there is like this distortion in the Electric Field Distribution in waveguide portion 201, also can waveguide portion 201 interior by anti-node location 205 roughly and roughly node position 206 be stably formed at the position of regulation.

In addition, in the structure of execution mode 3, by the interval of adjacent matching part 701 being set as to approximately 1/2 of wavelength in pipe λ g in waveguide portion 201, can reasonably form the Electric Field Distribution in the waveguide portion 201 maintaining by matching part 701 with the wavelength that is easy to exist.Therefore, in the microwave oven 101 of the microwave heating equipment as execution mode 3, efficient microwave transmission can be realized, efficient and stable microwave heating can be carried out.

In addition, in the structure of execution mode 3, be 0 and be node position 206 roughly at the position of matching part 701 amplitude, thus roughly anti-node location 205 to be present in from the distance of matching part 701 be the position of approximately 1/2 the odd-multiple of wavelength in pipe λ g in waveguide portion 201.

In the structure shown in Fig. 7, show the example that matching part 701 is disposed to central authorities' (on central shaft 211) of the Width of waveguide portion 201, but, even if depart from from the central authorities of the Width of waveguide portion 201 matching part 701, also can obtain same effect.

In addition, in the structure of execution mode 3, matching part 701 has been used the metal of drum, thereby is easy to realize matching part 701.In addition, as matching part 701, as long as the structure in the generating amplitude place that is 0, for example, can use at the inwall of waveguide portion 201 structure of depression or the metal parts of quadrangular shape etc. are set, can play same effect.

Then, Fig. 8 show the electric field 401 of standing wave 204 microwave radioactive department 102 present position places, in waveguide portion 201 phase place, and emit to the relation between the expansion of microwave of heating chamber 103 from waveguide portion 201.(a) of Fig. 8 is for illustrating in waveguide portion 201 inside, the figure of the relation the distance [× λ g] from matching part 701 to microwave radioactive department 102 center and the phase place [deg.] of standing wave (electric field 401).(b) of Fig. 8 is for illustrating in the position that is provided with microwave radioactive department 102, the figure that the expansion of the microwave radiating changes according to the phase state of the standing wave in waveguide portion 201.In addition, Fig. 8 obtains by electromagnetic field analysis.

The explanation of Fig. 5 of the explanation of being correlated with Fig. 8 and above-mentioned execution mode 1 is identical, all show following situation: in the time having increased approximately 1/8 the length of wavelength in pipe λ g from matching part 701 to the distance at microwave radioactive department 102 center, the variation of approximately 45 ° occurs the phase place of the electric field 401 in waveguide portion 201; And the propagation direction that emits to the microwave in heating chamber 103 also changes according to the phase place of the electric field 401 in waveguide portion 201.

As shown in Fig. 8 (b), be about 0 ° (the roughly node position 206 of (b) of Fig. 7) in phase place, illustrate similarly to there is the expansion of transmission direction 207 with above-mentioned principle.On the other hand, by making approximately 45 ° of phase shiftings (λ g/8), the directive property of microwave is passed in the counterclockwise direction, be about 90 ° (the roughly anti-node location 205 of Fig. 7 (b)) in phase place, with transmission and the rectangular direction 209 of direction of an electric field on there is the expansion of microwave.This is also consistent with above-mentioned principle explanation.

As mentioned above, by microwave radioactive department 102 being arranged to the roughly anti-node location 205 in waveguide portion 201, can make microwave expand to than the region of the width more lateral of waveguide portion 201, can be to the heating object homogeneous heating in heating chamber 103.

Then explanation is as concrete structure, the effect of the microwave oven 101 of the microwave heating equipment of embodiment of the present invention 3.

As shown in Figure 7, there is the matching part 701 of waveguide portion 201, the impedance adjustment use of the heating chamber 103 of storage heating object, the microwave generating unit 202 that produces microwave, transmission microwave, microwave radioactive department 102 to heating chamber 103 interior radiated microwaves as the microwave oven 101 of the microwave heating equipment of execution mode 3.Along disposing the microwave radioactive department 102 of multiple execution modes 1 across predetermined distance with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field (Width of waveguide portion 201).In addition, each microwave radioactive department 102 is configured in the roughly anti-node location 205 of the electric field 401 in waveguide portion 201.

In addition,, as shown in Fig. 7 (b), in the microwave oven 101 of execution mode 3, between the terminal part 203 of waveguide portion 201 and matching part 701, dispose microwave radioactive department 102.Its reason is, the amplitude of the electric field 401 in the waveguide portion 201 at the terminal part 203 of waveguide portion 201 and 701 places, matching part is 0, thereby the position of terminal part 203 and matching part 701 becomes roughly node position 206, the roughly anti-node location 205 of the electric field 401 producing between portion 203 and matching part 701 endways configures microwave radioactive department 102.And then, roughly anti-node location 205 places' configuration microwave radioactive departments 102 of approximately 1/4 the odd-multiple of the wavelength in pipe λ g in the distance from matching part 701 is waveguide portion 201.

In addition, only with the transmission and the rectangular direction 209 of direction of an electric field (Width) of waveguide portion 201 on, to separate the mode of predetermined distance, configure multiple microwave radioactive departments 102, thereby compared with utilizing the situation of single microwave radioactive department 102 radiated microwaves, can increase the expansion of microwave on the Width of waveguide portion 201.

As mentioned above, in the microwave oven 101 of execution mode 3, between the terminal part 203 of waveguide portion 201 and matching part 701 and be the position of approximately 1/4 the odd-multiple of wavelength in pipe λ g in waveguide portion 201 from the distance of matching part 701, dispose microwave radioactive department 102.And then, in the microwave oven 101 of execution mode 3, by with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on configure multiple microwave radioactive departments 102, can make microwave with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on expansion, become can be in the situation that not using driving mechanism the structure to heating object homogeneous heating.

In addition, in microwave heating equipment of the present invention, be not must be shown in Fig. 7 (a) structure, all microwave radioactive departments 102 are all disposed to roughly anti-node location 205, as long as at least 2 microwave radioactive departments 102 being disposed between the terminal part 203 of waveguide portion 201 and matching part 701 and being the structure of the position of approximately 1/4 the odd-multiple of wavelength in pipe λ g in waveguide portion 201 from the distance of matching part 701, just can play the effect same with the structure of execution mode 3, such structure comprises in the present invention.

In addition, in microwave heating equipment of the present invention, the quantity of microwave radioactive department and configuration are not limited to the structure of execution mode 3, can consider that specification, the structure etc. of microwave heating equipment suitably set.In addition, making beyond shape that 2 slits intersect shape as shown in Figure 7 in the configuration of microwave radioactive department about the asymmetric situation of central authorities 210 (with reference to Fig. 7) of heating chamber and the shape of microwave radioactive department, also can play same effect, such configuration and shape are also contained in the present invention.

(execution mode 4)

Then, with Fig. 9, the microwave oven as the microwave heating equipment of embodiment of the present invention 4 is described.Fig. 9 is the key diagram relevant to the microwave oven of the microwave heating equipment as execution mode 4.In Fig. 9, give identical numbering to representing with above-mentioned execution mode 1 to the part of the identical function of execution mode 3 essence, action.In addition, the elemental motion of execution mode 4 is identical to the elemental motion of the microwave heating equipment of execution mode 3 with execution mode 1, therefore in execution mode 4 as main its action and effect to be described with the difference of other execution modes.

Fig. 9 is explanation microwave radioactive department 102 and the position relationship between the phase place of the standing wave (electric field 401) of waveguide portion 201 interior generations, and the figure of position relationship between the matching part 701 of the terminal part 203 of waveguide portion 201, microwave generating unit 202 and impedance adjustment use.(a) of Fig. 9 is the waveguide portion 201 of explanation in microwave heating equipment 101, microwave radioactive department 102, matching part 701, microwave generating unit 202 plane graph with respect to the position relationship of heating chamber 103.(b) of Fig. 9 be the microwave radioactive department 102 of explanation in waveguide portion 201, the end view of position relationship between terminal part 203, matching part 701 and the microwave generating unit 202 of the phase place (the generation state of electric field 401) of the standing wave 204 of waveguide portion 201 interior generations, waveguide portion 201.

First structure as the microwave oven 101 of the microwave heating equipment of execution mode 4 is described.

As shown in Figure 9, the microwave oven 101 of execution mode 4 has the matching part 701 of waveguide portion 201, multiple impedance adjustment use of the heating chamber 103 of storage heating object, the microwave generating unit 202 that produces microwave, transmission microwave, microwave radioactive department 102 to heating chamber 103 interior radiated microwaves.The microwave radioactive department 102 of execution mode 4 is configured to, and upper with transmission and the rectangular direction 209 of direction of an electric field (Width) of waveguide portion 201, partition distance disposes multiple microwave radioactive departments 102.In addition, each microwave radioactive department 102 is configured in the roughly anti-node location 205 of the electric field 401 in waveguide portion 201.

In addition,, in the microwave oven 101 of execution mode 4, microwave radioactive department 102 has the shape that 2 slits is to the configuration of V word shape.Therefore, the microwave radioactive department 102 of execution mode 4 is configured to heating chamber 103 and radiates circularly polarized wave.

In addition,, as shown in Fig. 9 (b), being approximately 1/4 the odd-multiple of wavelength in pipe λ g in waveguide portion 201 with the distance of matching part 701, roughly anti-node location 205 places dispose microwave radioactive department 102.

As shown in Figure 9, in the structure of execution mode 4, the roughly node position in waveguide portion 201 disposes metal hemispheric matching part 701.When configurations match portion 701, amplitude is 0 in the position of matching part 701, can form reliably at 701 places, matching part the roughly node position 206 of the electric field 401 of the phase place of standing wave 204 like this.

As mentioned above, in the microwave heating equipment of execution mode 4, the position of approximately 1/4 the odd-multiple of the wavelength in pipe λ g in the distance from matching part 701 is waveguide portion 201 disposes microwave radioactive department 102, and then, with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on dispose multiple microwave radioactive departments 102, thereby can make microwave with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on expansion.Therefore, in the microwave heating equipment of execution mode 4, can be in the situation that not using driving mechanism, to heating object homogeneous heating.

In addition, structure is as shown in Figure 9 such, in microwave heating equipment of the present invention, be the structure of the position of approximately 1/4 the odd-multiple of wavelength in pipe λ g in waveguide portion as long as at least 2 microwave radioactive departments being disposed at from the distance of matching part, just can play the effect same with the structure of execution mode 4, such structure comprises in the present invention.

In addition, in microwave heating equipment of the present invention, the quantity of microwave radioactive department and position are not limited to the structure of execution mode 4, can consider the suitably setting such as specification, structure of microwave heating equipment, make the structure of 2 slits intersections and have in the structure of shape in addition at the asymmetric structure of the central authorities 210 about heating chamber (with reference to Fig. 9 (a)), microwave radioactive department, as long as realizing the structure of the microwave radiation with directive property, just can play the effect same with the structure of execution mode 4, such structure comprises in the present invention.

(execution mode 5)

Then, be used as the microwave oven of the microwave heating equipment of embodiments of the present invention 5 to describe.Figure 10 and Figure 11 are the key diagrams as the microwave oven 101 of the microwave heating equipment of execution mode 5.In Figure 10 and Figure 11, give identical numbering to representing with above-mentioned execution mode 1 to the part of the identical function of execution mode 4 essence, action.In addition, the elemental motion of execution mode 5 is identical to the elemental motion of execution mode 4 with execution mode 1, therefore in execution mode 5 as main its action and effect to be described with the difference of other execution modes.

Figure 10 is explanation as the figure of the microwave radioactive department 102 in the microwave oven 101 of the microwave heating equipment of execution mode 5 and the position relationship between the matching part 701 of terminal part 203, microwave generating unit 202 and the impedance adjustment use of the position relationship between the phase place of the standing wave (electric field 401) of waveguide portion 201 interior generations and waveguide portion 201.(a) of Figure 10 is the waveguide portion 201 of explanation in microwave oven 101, microwave radioactive department 102, matching part 701, microwave generating unit 202 plane graph with respect to the position relationship of heating chamber 103.(b) of Figure 10 be the microwave radioactive department 102 of explanation in waveguide portion 201, the end view of position relationship between terminal part 203, matching part 701 and the microwave generating unit 202 of the phase place (the generation state of electric field 401) of the standing wave 204 of waveguide portion 201 interior generations, waveguide portion 201.

Figure 11 is the figure that is illustrated in the example of the shape of microwave radioactive department 102 that use, radiation circularly polarized wave in the structure of microwave oven 101 of execution mode 5.

First the feature of the circularly polarized wave that microwave radioactive department 102 radiates is described and has used the advantage of the microwave heating of circularly polarized wave.

Circularly polarized wave is widely used technology in mobile communication and satellite communication field, as example at one's side, can enumerate ETC (Electronic Toll Collection System) " not Auto Fare Collection Parking System " etc.Circularly polarized wave is the microwave that the plane of polarization of electric field 401 rotates according to the time with respect to the direct of travel of electric wave, and there is following feature: in the time forming circularly polarized wave, the direction of electric field 401 changes according to time remaining, therefore the radiation angle that emits to the microwave in heating chamber 103 also continues to change, and not temporal evolution of the size of electric field strength.

Due to above-mentioned feature, compared with the microwave heating of the linearly polarized wave using in existing microwave heating equipment, can be on a large scale radiated microwaves dispersedly, thereby can carry out homogeneous heating to heating object.The trend of particularly carrying out homogeneous heating on the circumferencial direction of circularly polarized wave is stronger.In addition, circularly polarized wave is classified as these two kinds of right-handed polarized wave (CW:Clockwise, clockwise) and left-hand polarized waves (CCW:Counter Clockwise, counterclockwise) according to direction of rotation, but both heating properties do not have difference.

In addition, with respect to circularly polarized wave, the microwave in waveguide portion is the linearly polarized wave that the direction of vibration of Electric and magnetic fields is fixed-direction.In the microwave heating equipment in the past linearly polarized wave being emitted in heating chamber, the inhomogeneities distributing in order to reduce microwave, needs to arrange the mechanism etc. that makes the mechanism of the worktable rotary that loads heating object or make the rotation of antenna from from waveguide portion to heating chamber radiated microwaves.

Therefore, in the microwave heating equipment of execution mode 5, due to the microwave being configured to from waveguide portion 201 to the interior radiation circularly polarized wave of heating chamber 103, therefore can relax in the microwave heating of the microwave heating equipment of existing use linearly polarized wave and become standing wave problem, that produce in heating chamber due to the interference of ground wave and reflected wave, can realize uniform microwave heating.

Then, for the utilization of circularly polarized wave, in the communications field of open space and the heating field of enclosure space, there are some differences, therefore append explanation.In the communications field, for fear of only wish the required information of transmitting-receiving with mixing of other microwaves, therefore transmitter side be defined as in right-handed polarized wave or left-hand polarized wave any one send, receiver side is also correspondingly selected best reception antenna.

On the other hand, in heating field, be not the reception antenna with directive property, but receive micro-wave structure by not referring in particular to the heating objects such as tropism's food, therefore important part is only to allow microwave irradiate equably entirety.

Therefore,, even right-handed polarized wave and left-hand polarized wave mix also no problemly in the field of heating, but need to prevent from as far as possible causing the inhomogeneous heat distribution that adds due to the configuration position of heating object or the shape of heating object.For example, in the case of arranging single circularly polarized wave opening, heating object be disposed at circularly polarized wave opening directly over time comparatively good, and be disposed at towards the front and back of circularly polarized wave opening or when the position of left and right deviation when heating object, the position that approaches circularly polarized wave opening is easily heated, and position far away is difficult for being heated, its result causes heating object to produce heating inequality.Therefore,, in microwave heating equipment, multiple circularly polarized wave openings are preferably set.

In the microwave heating equipment of execution mode 5, as shown in figure 10, in the transmission direction 207 of waveguide portion 201, arrange and form the circularly polarized wave opening of 4 row as microwave radioactive department 102, with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on arrange and form the circularly polarized wave openings of 2 row as microwave radioactive department 102, add up to and dispose 8 circularly polarized wave openings.Especially line up the polarization wave line of propagation (right-handed polarized wave and left-hand polarized wave) opposite each other of 2 row and relative circularly polarized wave opening (microwave radioactive department 102) along right angle orientation 209, being configured in the communications field was not like this considered, being by the first structure realizing of the present invention, is to configure especially for heating field.

Then other shapes of the microwave radioactive department 102 of explanation radiation circularly polarized wave.Here specify the microwave radioactive department 102 being formed by least 2 above slits.

Figure 11 (a)～(f) is the plane graph that the example of the shape of the microwave radioactive department 102 of radiation circularly polarized wave is shown.As shown in Figure 11 (a)～(f), as the shape of microwave radioactive department 102 of radiation circularly polarized wave, can be to be formed by 2 above slits, and the shape that wherein the long limit of at least 1 slit tilts with respect to the transmission direction 207 of microwave.Therefore,, as the microwave radioactive department 102 of radiation circularly polarized wave, can be depicted as the Uncrossed shape of slit as (e) of Figure 11 with (f) or be depicted as Figure 11 (d) shape being formed by 3 slits.

In addition, as shown in figure 11, as the optimum shape condition of the microwave radioactive department 102 of the radiation circularly polarized wave being formed by least 2 slits, can enumerate 3 following points.

The 1st is, wavelength in pipe λ g approximately more than 1/4 of the length on the long limit of each slit in waveguide portion 201.The 2nd is, the long limit of the orthogonal and each slit of 2 slits for example, with respect to transmission direction 207 tilt (45 °).The 3rd is, the distribution of electric field 401 is not axisymmetric taking and straight line by microwave radioactive department 102 center parallel with the transmission direction 207 of waveguide portion 201 as axle.

For example, in situation by TE10 mode transfer microwave, electric field 401 distributes taking the central shaft 211 (with reference to Figure 10 (a)) of the transmission direction 207 of waveguide portion 201 as symmetry axis, and therefore its condition is that the shape of each microwave radioactive department 102 can not be configured to axial symmetry about the central shaft 211 of the transmission direction 207 of waveguide portion 201.

In addition, in the microwave heating equipment of execution mode 5, the microwave radioactive department 102 of radiation circularly polarized wave is the structure of the roughly X word shape of two slotted holes (slit) intersection.By such formation, can with simple reliable in structure radiate circularly polarized wave.

In addition, shown in the microwave heating equipment of above-mentioned execution mode 3 as shown in Figure 7, do not make by each microwave radioactive department 102 is configured to that slotted hole (slit) is orthogonal tilts it, become X word in horizontal (transmission direction 207) upper shape of being flattened more longways.In the situation that using this microwave radioactive department 102, can radiate circularly polarized wave, can be in the case of not reducing the slotted hole of circularly polarized wave opening, make the end (left and right sides is faced the wall and meditated) of microwave radioactive department 102 center more close waveguide portion 201.Its result, can make microwave further with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on expansion, can be in the situation that not using driving mechanism, to heating object homogeneous heating.

In addition, as Figure 11 (e) with (f), as the structure of microwave radioactive department 102, can be configured to T font or X font by multiple slits of linearity.Therefore, in the time that configuring each slit like that discretely, also can apply by above-mentioned patent documentation 2 as shown in figure 13.In addition, as microwave radioactive department 102, as shown in Figure 13 (b), two slits can not be orthogonality relation, and the 30 degree left and right that for example can tilt form.

In addition,, as the opening shape of slotted hole (slit) of microwave radioactive department 102 that forms execution mode 5, be not limited to rectangle.For example, by forming the bight of opening portion or opening portion is configured to ellipticity by curved portion (R), can eliminate the acute angle portion that exists electric discharge possible, thereby produce circularly polarized wave.As the thinking of basic circularly polarized wave opening, if longer in one direction slit and direction with respect to this slit of growing are tilted or orthogonal direction on shorter these two slits of slit constitute.

Then explanation is as the structure of the microwave oven 101 of the microwave heating equipment of execution mode 5.

As shown in figure 10, the microwave oven 101 of execution mode 5 has the heating chamber 103 of storage heating object, the microwave generating unit 202 that produces microwave, the waveguide portion 201 of transmission microwave, the matching part 701 of multiple impedance adjustment use, the microwave radioactive department 102 to the interior radiation of heating chamber 103 as the microwave of circularly polarized wave.The microwave radioactive department 102 of execution mode 5 is configured to, and is disposing multiple microwave radioactive departments 102 with transmission and the upper partition distance of the rectangular direction 209 of direction of an electric field (Width) of waveguide portion 201.In addition, each microwave radioactive department 102 is configured in the roughly anti-node location 205 of the electric field 401 in waveguide portion 201.

In addition,, in the microwave oven 101 of execution mode 5, as shown in Figure 10 (b), the position between adjacent matching part 701 and matching part 701 disposes microwave radioactive department 102.In waveguide portion 201, be 0 at the amplitude of the position of matching part 701 electric field 401, in node position 206 roughly.Therefore, in the microwave oven 101 of execution mode 5, between matching part 701 and matching part 701, produce the roughly anti-node location 205 of electric field 401, microwave radioactive department 102 is configured in to this roughly anti-node location 205 places reliably.

The microwave radioactive department 102 of the radiation circularly polarized wave in the microwave heating equipment of embodiments of the present invention 5 is configured to, in the upper and lower surface of the waveguide portion (301) shown in above-mentioned Fig. 3, magnetic field 402 forms the opening shape of regulation therein in the H face 302 of the face of parallel vortex, radiates reliably circularly polarized wave to heating chamber 103.

In addition, as mentioned above, compared with heating based on linearly polarized wave, the heating more equably in a circumferential direction of the heating based on circularly polarized wave.Especially with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on while configuring symmetrically microwave radioactive department 102, swirl direction is rightabout each other, therefore, at the equidirectional that is oriented of the center side of waveguide portion 201, can not cancel each other out.Therefore,, in the microwave heating equipment of execution mode 5, can make its expansion in the case of not wasting the microwave radiating from microwave radioactive department 102.

As mentioned above, in the microwave heating equipment of execution mode 5, by configuring microwave radioactive department 102 between the matching part 701 adjacent and matching part 701, and then with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on configure multiple microwave radioactive departments 102, can make microwave with the transmission of waveguide portion 201 and the rectangular direction 209 of direction of an electric field on expansion, can be in the situation that not using driving mechanism, to heating object homogeneous heating.

In addition, in microwave heating equipment of the present invention, be not must be as shown in figure 10 structure such, all microwave radioactive departments are all disposed to roughly anti-node location, as long as at least 2 microwave radioactive departments are disposed to the structure between adjacent matching part and matching part, just can play the effect same with the structure of execution mode 5, such structure comprises in the present invention.

In addition, in microwave heating equipment of the present invention, the quantity of microwave radioactive department and position are not limited to the structure of execution mode 5, can consider that specification, the structure etc. of microwave heating equipment suitably set.In addition, the configuration of microwave radioactive department is also contained in the present invention about the asymmetric situation of central authorities 210 (with reference to Figure 10) of heating chamber.

In addition, in microwave heating equipment of the present invention, as long as at least 1 microwave radioactive department of radiation circularly polarized wave is disposed to roughly anti-node location, can make microwave with the transmission of waveguide portion and the rectangular direction of direction of an electric field on expand, can play same effect, such structure comprises in the present invention.

As mentioned above, microwave heating equipment of the present invention be configured to there is the waveguide portion of the heating chamber of storage heating object, the microwave generating unit that produces microwave, transmission microwave, microwave radioactive department to radiated microwaves in heating chamber, with the transmission of waveguide portion and the rectangular direction of direction of an electric field (Width of waveguide portion) on there are multiple microwave radioactive departments.

As constructed as above microwave heating equipment of the present invention be configured to from the transmission of waveguide portion and the rectangular direction of direction of an electric field multiple microwave radioactive departments of alignment arrangements to radiated microwaves in heating chamber, thereby microwave is above being expanded with transmission and the rectangular direction of direction of an electric field (Width of waveguide portion) of waveguide portion, can also to heating chamber inside than the width of waveguide portion region radiated microwaves in the outer part, even if do not use driving mechanism also can make the heat distribution that adds of heating object become even.

In microwave heating equipment of the present invention, according to the phase state that is provided with the microwave in the waveguide portion of position of microwave radioactive department, the propagation direction of the microwave radiating in from microwave radioactive department to heating chamber changes.Especially by the roughly anti-node location place configuration microwave radioactive department at standing wave, can make microwave above expanding with transmission and the rectangular direction of direction of an electric field (Width of waveguide portion) of waveguide portion, can in the situation that driving mechanism not being set, make the heat distribution that adds of heating object become even.

In addition, in microwave heating equipment of the present invention, by the microwave radioactive department of radiation circularly polarized wave is set, from microwave radioactive department to heating chamber in radiation there is microwave as the divergence of circularly polarized wave feature, can make in the larger context microwave become even to the radiation of heating object.Especially for the microwave heating based on circularly polarized wave, can expect week homogeneous heating upwards.

In addition, in microwave heating equipment of the present invention, by being made as the shape that is formed the microwave radioactive department of radiation circularly polarized wave by 2 above slits, the homogeneous heating to heating object not only can be realized, the miniaturization of the microwave power pack that reliability is high (waveguide portion+microwave radioactive department) can also be realized by the easy structure of demand motive mechanism not.

Utilizability in industry

Microwave heating equipment of the present invention can carry out the uniform irradiation to heating object, therefore can effectively be used in heater that adds hot working or sterilization etc. of only food etc. etc.

Label declaration

101 microwave heating equipments (microwave oven)

102 microwave radioactive departments

103 heating chambers

201 waveguide portions

202 microwave generating units

203 terminal parts

205 anti-node location roughly

207 transmission directions

209 with transmission and the rectangular direction of direction of an electric field

701 matching parts

Claims (10)

1. a microwave heating equipment, it is configured to has:

The heating chamber of storage heating object;

Produce the microwave generating unit of microwave;

The waveguide portion of transmission microwave; And

To the microwave radioactive department of radiated microwaves in described heating chamber,

With the transmission of described waveguide portion and the rectangular direction of direction of an electric field on there are multiple described microwave radioactive departments.

2. microwave heating equipment according to claim 1, wherein,

The center of at least 2 described microwave radioactive departments is configured in the position corresponding with the roughly anti-node location of the electric field in described waveguide portion.

3. microwave heating equipment according to claim 1 and 2, wherein,

The center of at least 2 described microwave radioactive departments is configured in the position of the roughly the same phase place of the electric field in described waveguide portion.

4. according to the microwave heating equipment described in any one in claims 1 to 3, wherein,

The center of at least 2 described microwave radioactive departments is configured in the axisymmetric position, the center that is parallel to transmission direction about described waveguide portion in relative mode.

5. microwave heating equipment according to claim 2, wherein,

In the transmission direction of described waveguide portion, the center of at least 1 described microwave radioactive department is approximately 1/4 odd-multiple of wavelength in pipe in described waveguide portion to the distance of the terminal part of described waveguide portion.

6. microwave heating equipment according to claim 2, wherein,

In described waveguide portion, there is the matching part of at least 1 impedance adjustment use,

In the transmission direction of described waveguide portion, the center of at least 1 described microwave radioactive department is approximately 1/4 odd-multiple of wavelength in pipe in described waveguide portion to the distance of described matching part.

7. microwave heating equipment according to claim 2, wherein,

In described waveguide portion, there is the matching part of at least 1 impedance adjustment use,

In the transmission direction of described waveguide portion, and the terminal part of described matching part and described waveguide portion between the center that disposes at least 1 described microwave radioactive department, corresponding position.

8. microwave heating equipment according to claim 2, wherein,

In described waveguide portion, there is the matching part of at least 2 impedance adjustment use,

In the transmission direction of described waveguide portion, with adjacent described matching part between the center that disposes at least 1 described microwave radioactive department, corresponding position.

9. microwave heating equipment according to claim 2, wherein,

In the transmission direction of described waveguide portion, the center of at least 1 described microwave radioactive department is approximately 1/2 integral multiple of wavelength in pipe in described waveguide portion to the distance of the efferent of described microwave generating unit.

10. according to the microwave heating equipment described in any one in claim 1 to 9, wherein,

At least 1 described microwave radioactive department is radiation circular polarization wave structure.