CN103477707B - Microwave heating equipment - Google Patents
Microwave heating equipment Download PDFInfo
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- CN103477707B CN103477707B CN201280016371.8A CN201280016371A CN103477707B CN 103477707 B CN103477707 B CN 103477707B CN 201280016371 A CN201280016371 A CN 201280016371A CN 103477707 B CN103477707 B CN 103477707B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/72—Radiators or antennas
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Abstract
In microwave heating equipment of the present invention, the end (107) in the microwave transmission direction (MT) in waveguide (106) is closed, make the standing wave (SW) producing regulation in waveguide (106), the node of standing wave (SW) produced in waveguide (106) and the position of antinode configure roughly symmetrically about the center of heating chamber (103), therefore, when not using rotating mechanism, roughly uniform microwave heating can be carried out to heating object (102).
Description
Technical field
The present invention relates to the microwave heating equipments such as microwave oven, particularly at the characteristic microwave heating equipment of tool in the structure to heating chamber radiated microwaves.
Background technology
In the past, as this representative device of by microwave, heating object being carried out to the microwave heating equipment of heat treated, microwave oven was had.In microwave oven, the microwave produced in microwave feed unit is emitted to the inside of metal heating chamber, passes through radiated microwave and carries out heat treated to the heating object of heating chamber.
As the microwave feed unit in existing microwave oven, employ magnetron.The microwave generated by magnetron emits to heating chamber via waveguide from microwave radioactive department.When the magnetic distribution of the microwave of heating chamber is uneven, there is the problem can not carrying out microwave heating equably to heating object.
As equably to the means that the heating object of heating chamber heats, have and the mounting table of mounting heating object is rotated and the structure that heating object is rotated at heating chamber, fixing heating object and structure that the antenna of radiated microwaves is rotated or use phase shifter to change the structure of the phase place of the microwave transmitted from microwave feed unit, generally use possesses the microwave heating equipment of such structure.
Such as, in existing microwave heating equipment, some microwave heating equipments have following structure: have rotable antenna, antenna axis etc. in waveguide internal configurations, while make this rotable antenna rotate while drive magnetron by antenna electrical, reduce the uneven of the microwave distribution in heating chamber thus.
In addition, in Japanese Laid-Open Patent Publication 62-64093 publication (patent documentation 1), record the microwave heating equipment of other structures.Following microwave heating equipment is proposed: this microwave heating equipment is provided with rotable antenna on the top of magnetron in this patent documentation 1, by making wind from Air Blast fan to the blade of this rotable antenna, utilize the wind-force of this Air Blast fan that antenna is rotated, make the microwave changes in distribution in heating chamber.
On the other hand, in United States Patent (USP) No. 4301347 specification (patent documentation 2), describe following microwave heating equipment: this microwave heating equipment decreases the non-uniform heat flux to heating object in microwave heating, and the space achieving cost cutting and microwave power supply is saved.In this patent documentation 2, propose the microwave heating equipment with single microwave radioactive department circularly polarized wave being emitted to heating chamber.
Prior art document
Patent documentation
Patent documentation 1: Japanese Laid-Open Patent Publication 62-64093 publication
Patent documentation 2: United States Patent (USP) No. 4301347 specification
Summary of the invention
Invent problem to be solved
In the microwave heating equipment that the microwave oven with above-mentioned existing structure is such, require to have as far as possible simply to construct, and require efficiently, equably to heat heating object.But, in the existing structure proposed up to now, these requirements can not be met, constructively, the aspect such as high efficiency and homogenizing, there is various problem.
In addition, in microwave heating equipment, particularly microwave oven, the technological development development of high output, at home, specified high frequency output is the product commercialization of 1000W.Microwave oven is not heated food by heat transfer, and microwave oven is can use dielectric heating directly to the convenience that food heats as the notable feature of commodity.But in microwave oven, the high output under the state not yet solving non-uniform heat flux can cause the problem of non-uniform heat flux more obvious.
As the constructional problem that existing microwave heating equipment exists, following 2 points can be enumerated.First is, needs to use to reduce non-uniform heat flux the mechanism allowing mounting table or antenna rotate, and therefore must guarantee revolution space and for making the installation space of the drive sources such as the motor of mounting table or antenna rotation, hinder the miniaturization of microwave oven.Second point is, in order to rotate with making mounting table or antenna stabilization, need the top or the bottom that this antenna are arranged on heating chamber, being constructively restricted.
In addition, lead to microwave heating equipment heating chamber, in the space of illuminated microwave, be provided with the various mechanisms such as the rotating mechanism of mounting table or antenna and phase shifter, such arranges the problem existing and reduce device reliability.Therefore, the microwave heating equipment realizing not needing these mechanisms is required.
And, to decrease in microwave heating the non-uniform heat flux of heating object and in microwave heating equipment described in the patent documentation 2 saved of the space achieving cost cutting and microwave power supply, also there are the following problems.For the microwave heating equipment with single microwave radioactive department emitting to heating chamber disclosed in patent documentation 2, by circularly polarized wave, although have the advantage not possessing rotating mechanism, there is the problem not realizing sufficient homogeneous heating by microwave heating.
The present invention completes to solve above-mentioned the problems of the prior art, its object is to, providing a kind of microwave heating equipment that can carry out uniform microwave heating when not using rotating mechanism to heating object.
For solving the means of problem
Microwave heating equipment of the present invention has:
The heating chamber of configuration heating object;
Microwave supply unit, it generates the microwave supplied to described heating chamber;
Waveguide, its for the microwave transmission that will generate in described microwave supply unit to described heating chamber; And
Multiple microwave radioactive department, it is for emitting to described heating chamber by the microwave transmitted in described waveguide,
The end in the microwave transmission direction in described waveguide is closed, and makes the standing wave producing regulation in described waveguide,
The distribution of the standing wave produced in described waveguide configures roughly symmetrically about the center of described heating chamber.
In the microwave heating equipment of the present invention formed as mentioned above, microwave from microwave radioactive department is the source of the energy to the heating object radiation configured in heating chamber, described microwave from microwave radioactive department configures relative to heating chamber equably as the standing wave produced in waveguide, therefore, it is possible to make the heating of heating object be evenly distributed.
Invention effect
In microwave heating equipment of the present invention, the microwave from microwave radioactive department of the heating object radiation configured in heating chamber is configured relative to heating chamber as the standing wave produced in waveguide, equably therefore, it is possible to carry out uniform microwave heating to heating object.
Accompanying drawing explanation
Fig. 1 is the cutaway view of the schematic configuration of the microwave heating equipment that embodiments of the present invention 1 are shown.
Fig. 2 is the stereogram of the microwave heating equipment that embodiments of the present invention 1 are shown.
(a) of Fig. 3 is the stereogram of the outline surface structure of the waveguide illustrated in the microwave heating equipment of embodiments of the present invention 1, b () is the side sectional view of the waveguide in the microwave heating equipment of execution mode 1, and (c) is the vertical view of the waveguide in the microwave heating equipment of execution mode 1 relative to the configuration status of heating chamber.
Fig. 4 illustrates the vertical view of the waveguide in the microwave heating equipment of embodiments of the present invention 2 relative to the configuration status of heating chamber.
Fig. 5 illustrates the vertical view of the waveguide in the microwave heating equipment of embodiments of the present invention 3 relative to the configuration status of heating chamber.
Embodiment
The microwave heating equipment of the 1st mode of the present invention has:
The heating chamber of configuration heating object;
Microwave supply unit, it generates the microwave supplied to described heating chamber;
Waveguide, its for the microwave transmission that will generate in described microwave supply unit to described heating chamber; And
Multiple microwave radioactive department, it is for emitting to described heating chamber by the microwave transmitted in described waveguide,
The end in the microwave transmission direction in described waveguide is closed and described waveguide has the shape of regulation, makes to produce the standing wave with provision wavelengths in described waveguide,
The distribution of the standing wave produced in described waveguide configures roughly symmetrically about the center of the heating region of described heating chamber.
In the microwave heating equipment of the 1st mode of the present invention formed like this, the microwave from microwave radioactive department of the heating object radiation configured in heating chamber is configured relative to heating chamber as the standing wave produced in waveguide, roughly equably therefore, it is possible to carry out uniform microwave heating to heating object.
The microwave heating equipment of the 2nd mode of the present invention is in described 1st mode, and described multiple microwave radioactive department configures roughly symmetrically about the center of described heating region.In the microwave heating equipment of the 2nd mode of the present invention formed like this, because the center of microwave radioactive department about region configures roughly symmetrically, therefore, it is possible to carry out evenly and microwave heating efficiently heating object.
The microwave heating equipment of the 3rd mode of the present invention is in described 2nd mode, in the mode that the interval of the standing wave produced in the distance between centers of described multiple microwave radioactive department and waveguide is roughly the same, described waveguide arranges described microwave radioactive department.In the microwave heating equipment of the 3rd mode of the present invention formed like this, for the microwave from microwave radioactive department of the heating object radiation configured in heating chamber, the distribution of the standing wave produced in waveguide with this microwave configures microwave radioactive department accordingly, therefore, it is possible to carry out uniform microwave heating to heating object.
The microwave heating equipment of the 4th mode of the present invention is in described 3rd mode, is configured to, and the node position of the standing wave produced in described waveguide is corresponding with the center of the heating region of described heating chamber.In the microwave heating equipment of the 4th mode of the present invention formed like this, can from microwave radioactive department to heating chamber radiated microwaves equably.
The microwave heating equipment of the 5th mode of the present invention is in described 4th mode, and the node position of described microwave radioactive department and the interior standing wave produced of described waveguide configures accordingly.In the microwave heating equipment of the 5th mode of the present invention formed like this, the excessive output from microwave radioactive department can be prevented, can carry out heating chamber evenly microwave radiation.Particularly, form as described above, can to the heating object being configured in heating chamber center radiated microwaves and carry out uniform heat treated efficiently.
The microwave heating equipment of the 6th mode of the present invention is in described 5th mode, is formed with the standing wave with even number antinode in the region relative with the heating region of described heating chamber in described waveguide.In the microwave heating equipment of the 6th mode of the present invention formed like this, can carry out heating chamber on the microwave transmission direction of described waveguide evenly microwave radiation.
The microwave heating equipment of the 7th mode of the present invention is that in described 6th mode, described microwave radioactive department is made up of the opening of radiated microwaves, and this opening configures symmetrically about the tubular axis extended along microwave transmission direction in described waveguide.In the microwave heating equipment of the 7th mode of the present invention formed like this, even if for the heating region in vertical direction, the microwave transmission direction with waveguide, the homogenizing of microwave radiation also can be realized.
The microwave heating equipment of the 8th mode of the present invention is that described microwave radioactive department is made up of the opening of radiated microwaves in described 6th mode, and this opening asymmetricly configures about the tubular axis in the microwave transmission direction in described waveguide.The microwave heating equipment of the 8th mode of the present invention of such formation can carry out uniform microwave radiation to heating chamber.
The microwave heating equipment of the 9th mode of the present invention is in any one mode in described 1st to the 8th mode, is configured to, roughly the same from the microwave amount of described microwave radioactive department radiation.In the microwave heating equipment of the 9th mode of the present invention formed like this, uniform microwave radiation can be carried out from multiple microwave radioactive department to heating object.
The microwave heating equipment of the 10th mode of the present invention is in any one mode in described 1st to the 8th mode, described waveguide is configured to, the standing wave wavelength of the standing wave produced in described waveguide with to supply from described microwave supply unit and the transmission wavelength of the microwave transmitted in described waveguide is roughly equal.The microwave heating equipment of the 10th mode of the present invention of such formation stably can produce the standing wave of expectation in waveguide.
The microwave heating equipment of the 11st mode of the present invention is in any one mode in described 1st to the 8th mode, is configured to, described microwave radioactive department radiation circularly polarized wave.In the microwave heating equipment of the 11st mode of the present invention formed like this, the microwave of divergence can be had from the radiation of microwave radioactive department, uniform microwave radiation can be carried out with larger scope to heating object.
The microwave heating equipment of the 12nd mode of the present invention is in any one mode in described 1st to the 8th mode, and the microwave transmission distance from the output of described microwave supply unit to the end of described waveguide is from described microwave supply unit supply and the integral multiple of 1/4th of the transmission wavelength of the microwave transmitted in described waveguide.In the microwave heating equipment of the 12nd mode of the present invention formed like this, the standing wave had with the transmission same wavelength stably carrying out microwave transmission can be produced in waveguide, even if therefore carry out microwave radiation from microwave radioactive department to heating chamber, also in waveguide, stably standing wave can be maintained.
The microwave heating equipment of the 13rd mode of the present invention is in any one mode in described 1st to the 8th mode, described waveguide is square waveguide, and be configured to: when set from the supply wavelength of described microwave supply unit supply as the length vertical with the microwave transmission direction of described waveguide being provided with the wall of described microwave radioactive department of λ, described waveguide be a time, the standing wave wavelength X n of the standing wave produced in described waveguide is roughly equal with the transmission wavelength X g by the microwave transmitted in described waveguide shown in following formula (1).In the microwave heating equipment of the 13rd mode of the present invention formed like this, reliably can produce in waveguide and there is the standing wave with the transmission same wavelength stably carrying out microwave transmission.
[formula 1]
Below, be described with reference to the preferred implementation of accompanying drawing to microwave heating equipment of the present invention.In addition, although in the microwave heating equipment of following execution mode, microwave oven is described, but microwave oven is example, microwave heating equipment of the present invention is not limited to microwave oven, also comprises the microwave heating equipment of heater, garbage disposer or the semiconductor-fabricating device etc. that make use of dielectric heating.
In addition, the invention is not restricted to the concrete structure of following execution mode, the structure based on constructed thought is also contained in the present invention.
(execution mode 1)
Fig. 1 is the cutaway view of the schematic configuration of the microwave heating equipment that embodiments of the present invention 1 are shown.As shown in Figure 1, the microwave heating equipment of execution mode 1 has: the framework 101 of constituent apparatus outward appearance; For carrying out the heating chamber 103 of microwave heating to heating object 102; For the mounting portion 104 at heating chamber 103 inside mounting heating object 102; Form the microwave supply unit 105 of microwave; And for by the microwave transmission from microwave supply unit 105 to the waveguide 106 of heating chamber 103.In addition, in microwave heating equipment, be formed in waveguide 106 as the terminal part 107 closed of the transmission end of microwave and the microwave radioactive department 108 to heating chamber 103 radiated microwaves.Be configured to: utilize the microwave radiated from microwave radioactive department 108 to carry out microwave heating to as the heating object 102 mounting portion 104 of heating region.
In addition, in the microwave heating equipment of execution mode 1, employ glass plate as mounting portion 104, employ magnetron as microwave supply unit 105, and to employ the cross section vertical with microwave transmission direction be that the square waveguide of quadrangle is as waveguide 106.In addition, microwave radioactive department 108 is configured to have the radiation mouth 108a as opening, and described opening is formed on the wall relative with heating chamber 103 of waveguide 106.Form as described above, the microwave heating equipment of execution mode 1 can be realized with simple structure.
Fig. 2 is the stereogram of the microwave heating equipment that embodiments of the present invention 1 are shown.As shown in Figure 2, the microwave heating equipment of execution mode 1 possesses door 201, and door 201 for putting into heating object 102 or taking out heating object 102 from heating chamber 103 in heating chamber 103.The state that the door 201 that Fig. 2 shows microwave heating equipment opens wide.
(a) in Fig. 3 is the stereogram of the outline surface structure of the waveguide 106 illustrated in the microwave heating equipment of execution mode 1.In figure 3, b () is the side sectional view of the waveguide 106 in the microwave heating equipment of execution mode 1, (c) illustrates the vertical view of the waveguide 106 in the microwave heating equipment of execution mode 1 relative to the configuration status of heating chamber 103.Waveguide 106 shown in (c) of Fig. 3 and heating chamber 103 are the figure from top view waveguide 106 etc.
In addition, in (c) of Fig. 3, represent heating chamber 103 with single dotted broken line, represent microwave radioactive department 108 with double dot dash line.In (c) of Fig. 3, although represent the microwave radioactive department 108 represented with double dot dash line with rectangular area, but this rectangular area does not limit the shape of microwave radioactive department 108, just merely represent the region that should form opening of microwave radioactive department 108.As the concrete opening shape of microwave radioactive department 108, as long as the microwave of in the future self-waveguide pipe 106 shape in heating chamber 103 can be emitted to equably, be not limited to rectangular shape.
In the microwave heating equipment of execution mode 1, waveguide 106 is configured in the below of the heating region (mounting portion 104) of the bottom surface as heating chamber 103, the microwave transmission direction MT of waveguide 106 is consistent with the left and right directions of heating chamber 103.In addition, the center line (tubular axis) along microwave transmission direction MT extension in waveguide 106 is configured to overlapping up and down with the center line of the left and right directions of the bottom surface of heating chamber 103 (heating region).
In the microwave heating equipment of the execution mode 1 formed as mentioned above, the radiation mouth 108a of microwave radioactive department 108 is formed in the opening in the top wall face portion relative with heating chamber (heating region) of waveguide 106, be configured to the microwave existed in heating chamber 103 radiating guide 106 from this opening, microwave heating is carried out to heating object.
Then, the action of the microwave heating equipment of execution mode 1 is described.First, the outline action of microwave heating equipment is described.
Heating object 102 is configured in the mounting portion 104 in heating chamber 103 by user, and setting heating condition also instruction starts heating.When user indicate start to heat time, this microwave heating equipment encourages the magnetron as microwave supply unit 105, in waveguide 106, supply microwave.In the waveguide 106 being supplied to microwave, the microwave that supply comes is reflected by the terminal part 107 of waveguide 106, as shown in (b) of Fig. 3, in waveguide 106, produces standing wave SW.
In the microwave heating equipment of execution mode 1, near the node of the standing wave SW formed as microwave supply source, be provided with the radiation mouth 108a of the opening as microwave radioactive department 108.That is, the plumb line of the node position NP of the standing wave SW produced in waveguide 106 is formed with the opening of microwave radioactive department 108.Utilize the microwave radioactive department 108 formed as mentioned above, from waveguide 106 to radiated microwaves in heating chamber 103, thus, the microwave heating equipment of execution mode 1 carries out microwave heating to the heating object 102 in heating chamber 103.
Then, the node position NP of the standing wave SW be formed in waveguide 106 is described.As shown in (b) of Fig. 3, when to possess supply the microwave from microwave supply unit 105 as the waveguide 106 of terminal part 107 of the end closed time, microwave from microwave supply unit 105 transmits in the waveguide 106 of regulation shape, and reflect at terminal part 107 place of waveguide 106, thus produce standing wave SW in waveguide 106.
Because waveguide 106 is closed at terminal part 107 place, therefore the amplitude at terminal part 107 place is fixed to zero.On the other hand, the supply side of the microwave supply unit 105 shown in Fig. 1 shows the free end of peak swing value as shown in Fig. 3 (b).Therefore, about the wavelength of the standing wave SW produced in waveguide 106, the length c of the microwave transmission direction MT shown in (a) of Fig. 3 can be used and represent and carry out computing simply by following formula (2) by the natural number s of standing wave mode.In addition, length c represents the microwave transmission distance of the terminal part 107 from the output of microwave supply unit 105 to waveguide 106.
[formula 2]
Such as, when the length c of the microwave transmission direction MT in waveguide 106 is set to 346mm and applies above formula (2) and make λ become λ n, the wavelength X n of the standing wave SW formed in waveguide 106 and the interval (λ n/2) of standing wave SW are respectively shown in (table 1) described as follows.Herein, the interval of standing wave SW is the length from the node of standing wave SW to node.
[table 1]
In addition, for the standing wave SW formed in waveguide 106, become first-harmonic from the microwave of the frequency of oscillation of microwave supply unit 105 supply, the microwave of this frequency of oscillation transmits and becomes the microwave of transmitted frequency in square waveguide 106, and the microwave of this transmitted frequency produces standing wave SW through reflection.Therefore, the waveform of the standing wave SW formed in waveguide 106 naturally become with from microwave supply unit 105 and the identical waveform of the transmission waveform transmitted in waveguide 106, this waveform is the state of the easiest stable existence in waveguide 106.When set the wavelength that exports from microwave supply unit 105 as λ (λ=(light velocity)/(frequency of oscillation)), as waveguide 106 cut-off wavelength of transmissible maximum wavelength (low-limit frequency) be λ c time, the transmission wavelength X g of the microwave transmitted in waveguide 106 is as shown in the formula shown in (3).In addition, cut-off wavelength is the width of waveguide 106 by λ c=2 × a(a) determine.Herein, the width a of waveguide 106 refers to the length vertical with the microwave transmission direction MT of waveguide 106 being provided with the wall of microwave radioactive department 108 of waveguide 106.
[formula 3]
Such as, when the frequency of oscillation of microwave supply unit 105 be 2.46 [GHz], the width a of waveguide 106 be 100 [mm], when these numerical value being updated to formula (3), transmit wavelength become λ g=153.86 [mm].Therefore, according to above-mentioned (table 1), in waveguide 106, form the standing wave SW that standing wave mode is s=5, the interval of standing wave SW (λ n/2) is 76.9 [mm].Its result, also exists the standing wave SW of the node shown in (b) with Fig. 3 and antinode in waveguide 106.
But, in the waveguide 106 of reality, when the state of the terminal part 107 of the output of microwave supply unit 105 and the engagement state of waveguide 106 or waveguide 106 is not perfect condition, also may obtain the state of the standing wave mode of the value before and after operation values.Such as, in this case, the state that standing wave mode is s=4 or s=6 may be obtained.Therefore, as the wavelength of standing wave SW in esse in waveguide 106, the amplitude of the standing wave SW in waveguide 106 is confirmed preferably by actual measurement.
According to the experimental verification of inventor to: stably exist in order to the standing wave SW produced in waveguide 106 also can be made after having radiated microwave from the radiation mouth 108a of microwave radioactive department 108 in heating chamber 103, preferably waveguide 106 is configured to, the state making the wavelength X n of standing wave SW become identical with the state of the microwave transmitted in waveguide 106, namely becomes and transmit the identical value of wavelength X g.By forming waveguide 106 in this wise, the standing wave SW with the transmission wavelength X g phase co-wavelength transmitted in waveguide 106 can be produced, therefore can not produce inharmonic state in waveguide 106, become the most stable waveform state.Therefore, when determining the microwave transmission distance of the terminal part 107 of length c(from the output of microwave supply unit 105 to waveguide 106 of the microwave transmission direction MT in waveguide 106) time, in the following formula (4) obtained being out of shape above formula (2), substitute in wavelength X and transmit wavelength X g(≒ λ n: be 153.86 [mm] execution mode 1), the standing wave state (being s=5 execution mode 1) existed in desired wave conduit 106 is substituted in standing wave mode s, carried out from microwave radioactive department 108 condition that microwave radiation also can maintain stable standing wave SW in waveguide 106 even if can generate thus.
[formula 4]
As mentioned above, in the microwave heating equipment of execution mode 1, from the radiation mouth 108a of microwave radioactive department 108 to the mounting portion 104(heating region be positioned in heating chamber 103) heating object 102 radiate microwave as energy source, and this microwave is become be positioned at the standing wave SW of the microwave that the waveguide 106 below heating chamber 103 exists.In waveguide 106, be formed uniformly the distribution (antinode of standing wave SW and the configuration status of node) of the standing wave SW produced in waveguide 106, the radiation mouth 108a of multiple microwave radioactive department 108 corresponds to the distribution of this standing wave and is disposed on waveguide 106.By the radiation mouth 108a from these microwave radioactive departments 108 to radiated microwaves in heating chamber 103, the heating for the heating object 102 in heating chamber 103 can be made to be evenly distributed.
In the microwave heating equipment of execution mode 1, the center of radiation mouth 108a of microwave radioactive department 108 is corresponding with the position that node, the i.e. amplitude of the standing wave SW in waveguide 106 are essentially zero.In addition, when the sheet material of hypothesis same thickness forms the shape of radiation mouth 108a, the center of the radiation mouth 108a of microwave radioactive department 108 represents the position of centre of gravity of this sheet material.
Make the center of the radiation mouth 108a of microwave radioactive department 108 become to be essentially with the amplitude of standing wave SW the position that the node of zero is corresponding as described above, can prevent from exceedingly exporting microwave from the radiation mouth 108a of microwave radioactive department 108 to heating chamber 106, can to heating object 102 more uniformly radiated microwaves.
In the microwave heating equipment of execution mode 1, as shown in (c) of Fig. 3, waveguide 106 with the microwave transmission direction MT of waveguide 106 for the mode of the left and right directions of heating chamber 103 bottom surface is arranged on immediately below heating chamber 103.In addition, waveguide 106 is configured to: the central shaft extended along left and right directions along central shaft and heating chamber 103 bottom surface that direction of transfer extends of waveguide 106 is overlapping in the vertical direction.
In addition, in the microwave heating equipment of execution mode 1, be configured to: in the region shared by the region shared by heating chamber 103 and waveguide 106, go up at them the antinode that there is even number standing wave SW in overlapping region up and down, the position of the node NP of standing wave SW becomes the position corresponding with the approximate centre of the bottom surface of heating chamber 103 (mounting portion 104).In the example shown in (b) of Fig. 3, in the up and down overlapping region of the region shared by heating chamber 103 with the region shared by waveguide 106, have four antinodes of standing wave SW.And, be configured to: the center being in the microwave radioactive department 108 of the approximate centre of the bottom surface (mounting portion 104) of heating chamber 106 is roughly corresponding to the position of node NP at center being positioned at standing wave SW, and wherein this standing wave SW has four antinodes in the region overlapping up and down of the region shared by heating chamber 103 with the region shared by waveguide 106.
As mentioned above, by near the node that microwave radioactive department 108 is configured in standing wave SW, the radiation mouth 108a of microwave radioactive department 108 can be arranged at the middle section of often mounting heating object 102 in heating chamber 103, efficient microwave heating can be realized.
In addition, in heating chamber 103, for the radiation mouth 108a in the region being configured near wall of microwave radioactive department 108 and microwave radioactive department 108 be configured at radiation mouth 108a in middle section each other for, due to the reflections affect etc. for heating chamber 103, even identical shape, identical size, exit dose is sometimes not identical yet.
In this case, can tackle as follows: according to each node position of standing wave SW, increase and decrease ground changes the aperture area of the radiation mouth 108a of each microwave radioactive department 108, becomes thus and makes from the roughly the same shape of the microwave amount of each microwave radioactive department 108 radiation.Form as described above, the microwave radiation of even microwave amount can be carried out from the radiation mouth 108a of each microwave radioactive department 108 near the node of the standing wave SW be formed in waveguide 106 to heating chamber 106.
In addition, in the microwave heating equipment of execution mode 1, although be illustrated with the peristome shape of the rectangular shape shown in (c) of Fig. 3 to microwave radioactive department 108, but as the microwave radioactive department 108 in the present invention, be not limited to this opening shape, as long as can from the shape of waveguide 106 radiated microwaves efficiently.
In addition, in the microwave heating equipment of execution mode 1, preferably, the microwave transmission distance c from the output of microwave supply unit 105 to terminal part 107 in waveguide 106 is the integral multiple that namely wavelength in pipe transmits 1/4th (the λ g/4) of wavelength X g.By the integral multiple, the particularly odd-multiple that make microwave transmission distance c become 1/4th (the λ g/4) transmitting wavelength X g in this wise, can coordinate with waveguide 106 phase, the standing wave SW with the transmission wavelength X g phase co-wavelength of stable existence in waveguide 106 can be produced.Its result, even if carry out microwave radiation from microwave radioactive department 108 pairs of heating chambers 103, also stably can maintain standing wave in waveguide 106.
As mentioned above, in the microwave heating equipment of execution mode 1, the end of the microwave transmission direction MT in waveguide 106 is closed and waveguide 106 has regulation shape, makes to produce the standing wave with provision wavelengths in waveguide 106.In addition, can be configured to: the standing wave SW produced in waveguide 106 configures roughly symmetrically about the center of the heating region (104) in heating chamber 103, the distance between centers of multiple microwave radioactive department 108 is roughly the same with the interval (interval between node NP and node NP) of the interior standing wave SW produced of waveguide 106.In the microwave heating equipment of the execution mode 1 formed as mentioned above, the microwave from microwave radioactive department 108 that the heating object 102 of configuration in heating chamber 103 radiates is configured relative to heating chamber 103 roughly equably as the standing wave SW produced in waveguide 106, microwave radioactive department 108 corresponds to the distribution of this standing wave and is configured in assigned position, therefore, it is possible to carry out uniform microwave heating to heating object 102.
In addition, the microwave heating equipment of execution mode 1 is configured to, the node position of the standing wave SW produced in waveguide 106 is corresponding with the center of the heating region of heating chamber 103, therefore, it is possible to carry out uniform microwave radiation from the radiation mouth 108a of microwave radioactive department 108 to heating chamber 103.
In the microwave heating equipment of execution mode 1, microwave radioactive department 108 is configured accordingly with the position of the node NP of the interior standing wave SW produced of waveguide 106, therefore, it is possible to prevent the excessive output from microwave radioactive department 108, can carry out heating chamber 103 evenly microwave radiation.
In the microwave heating equipment of execution mode 1, also can being configured to, by increasing and decreasing the aperture area of the radiation mouth 108a of each microwave radioactive department 108, making from the microwave amount of each radiation mouth 108a radiation roughly the same.In the microwave heating equipment formed as mentioned above, multiple microwave radioactive department can be made respectively to the microwave amount homogenizing of heating object radiation.
And, in the microwave heating equipment of execution mode 1, the standing wave SW with even number antinode is defined in the region relative with the heating region (104) in heating chamber 103 in waveguide 106, and configure microwave radioactive department 108 accordingly with the node NP of this standing wave SW, therefore, on microwave transmission direction MT in waveguide 106, also can to heating chamber 103 radiated microwaves equably.Particularly, form as described above, to heating object 102 radiated microwaves efficiently at center being configured in heating chamber 103, can carry out heat treated equably.
(execution mode 2)
Below, the microwave heating equipment of embodiments of the present invention 2 is described.In the microwave heating equipment of execution mode 2, be with the difference of the microwave heating equipment of above-mentioned execution mode 1, microwave radioactive department is decided to be radiation circular polarization wave structure, and other aspects are identical.
In the explanation of the microwave heating equipment of following execution mode 2, for having the function identical with the inscape in the microwave heating equipment of execution mode 1, the part of structure marks identical label, and it describes the explanation of application implementation mode 1 in detail.
Fig. 4 illustrates the vertical view of the waveguide 106 in the microwave heating equipment of execution mode 2 relative to the configuration status of heating chamber 103, is the figure from top view waveguide 106.In the diagram, represent heating chamber 103 with single dotted broken line, represent microwave radioactive department 108 with double dot dash line.In the diagram, although represent the microwave radioactive department 108 represented with double dot dash line with rectangular area, this rectangular area does not limit the shape of microwave radioactive department 108, just represents the forming region that should form opening of microwave radioactive department 108 simply.
Below, the action of the microwave heating equipment of execution mode 2, effect are described.But the elemental motion of the microwave heating equipment of execution mode 2 is identical with execution mode 1, therefore omits the description here.
In the microwave heating equipment of execution mode 2, the microwave radioactive department 108 configured near the node of the standing wave SW existed in waveguide 106 has the such radiation circular polarization wave structure of Fig. 4.Circularly polarized wave is widely used technology in mobile communication and satellite communication field, as example at one's side, can enumerate ETC(ElectronicTollCollectionSystem) " not Auto Fare Collection Parking System " etc.
Circularly polarized wave is the microwave that the plane of polarization of electric field rotates according to the time relative to the direct of travel of electric wave, and there is following feature: when forming circularly polarized wave, the direction of electric field changes according to time remaining, therefore the rotation angle emitting to the microwave in heating chamber 103 also continues change, and the size of electric field strength does not change in time.
In the microwave heating equipment of execution mode 2, be configured to the microwave of the inner radiation circularly polarized wave from each microwave radioactive department 108 to heating chamber 103.In the microwave heating equipment of the execution mode 2 formed as mentioned above, compared with the microwave heating of the linearly polarized wave used in microwave heating equipment, can in the inside of heating chamber 103 radiated microwaves dispersedly on a large scale, therefore, it is possible to carry out uniform microwave heating to the heating object 102 be positioned in heating chamber 103.
Particularly when radiating the microwave of circularly polarized wave, stronger in the trend of circumferentially carrying out homogeneous heating of circularly polarized wave.In addition, circularly polarized wave is categorized as right-handed polarized wave (CW:clockwise) and left-hand polarized wave (CCW:counterclockwise) these two kinds according to direction of rotation.The microwave no matter emitting to the circularly polarized wave of heating chamber 102 inside is right-handed polarized wave (CW) or left-hand polarized wave (CCW), and heating properties does not all have difference.
In the microwave heating equipment of execution mode 2, same with the microwave heating equipment of above-mentioned execution mode 1, be configured near position corresponding to position being actually zero with node, the i.e. amplitude of the standing wave SW in waveguide 106 as the center of the radiation mouth 108b of the opening of microwave radioactive department 108.As mentioned above, because the center of the radiation mouth 108b of microwave radioactive department 108 is near position corresponding to node being actually zero with the amplitude of standing wave SW, therefore, it is possible to prevent from exceedingly exporting microwave from microwave radioactive department 108 to heating chamber 106, can more uniformly to heating object 102 radiated microwaves.
As mentioned above, in the microwave heating equipment of execution mode 2, the microwave as energy source emitted in heating chamber 103 from microwave radioactive department 108 is made to become the standing wave SW of the waveguide 106 be positioned at below heating chamber 103.In waveguide 106, be formed uniformly the distribution (antinode of standing wave SW and the configuration status of node) of this standing wave SW, multiple microwave radioactive department 108 corresponds to the distribution of this standing wave and is disposed on waveguide 106.By radiating the microwave of circularly polarized wave in heating chamber 103 from these microwave radioactive departments 108, the heating for the heating object 102 in heating chamber 103 can be made to be evenly distributed.
In the microwave heating equipment of execution mode 2, as the structure of microwave radioactive department 108, shape is not particularly limited, as long as have radiation circular polarization wave structure, as the example of concrete shape, is described with reference to Fig. 4.Fig. 4 shows the concrete opening shape formed in the region of the microwave radioactive department 108 used in the microwave heating equipment of execution mode 2.Microwave radioactive department 108 shown in Fig. 4 is formed on the face relative with heating chamber 103 of waveguide 106, is formed with the radiation mouth 108b of the opening of the microwave as radiation circularly polarized wave in the region of this microwave radioactive department 108.Radiation mouth 108b is that two slits (elongated opening portion) making to have width intersect in central authorities and form, and each slit has tilted 45 degree relative to the microwave transmission direction MT of waveguide 106.In addition, radiation mouth 108b, in microwave radioactive department 108, is formed at the position that deviate from predetermined distance from the tubular axis P along microwave transmission direction MT extension of waveguide 106, needs radiation mouth 108b to be configured in not by the position directly over tubular axis P.In the microwave heating equipment of execution mode 2, be configured to: the radiation mouth 108b in each microwave radioactive department 108 is configured in the front and back position (asymmetricly configuring) of tubular axis P interlaced with each otherly, and each microwave radioactive department 108 radiates right-handed polarized wave CW or left-hand polarized wave CCW.
As mentioned above, in the microwave heating equipment of execution mode 2, by the shape making the radiation mouth 108b of microwave radioactive department 108 become radiation circularly polarized wave (comprising elliptically polarized wave), radiate the microwave with divergence from microwave radioactive department 108.Its result, the microwave heating equipment of execution mode 2 becomes can with the structure of larger scope to heating object 102 radiated microwaves equably.
In addition, in the microwave heating equipment of execution mode 2, as the microwave radioactive department 108 of radiation circularly polarized wave, describe the structure of the radiation mouth 108b making two slots intersect, but the invention is not restricted to such structure, as long as the shape of radiation circularly polarized wave (comprising elliptically polarized wave).
As mentioned above, in the microwave heating equipment of execution mode 2, microwave radioactive department 108 is made up of the radiation mouth 108b of the opening as radiated microwaves, and this radiation mouth 108b asymmetricly configures relative to the tubular axis P of the microwave transmission direction MT in waveguide 106.The microwave heating equipment of the execution mode 2 of such formation can carry out uniform microwave radiation with larger scope to heating chamber 103.
(execution mode 3)
Below, the microwave heating equipment of embodiments of the present invention 3 is described.In the microwave heating equipment of execution mode 3, be with the difference of the microwave heating equipment of above-mentioned execution mode 1, microwave radioactive department is decided to be radiation circular polarization wave structure, and other aspects are identical.In addition, the elemental motion of the microwave heating equipment of execution mode 3 is identical with the microwave heating equipment of execution mode 1.
In the explanation of the microwave heating equipment of following execution mode 3, for having the function identical with the inscape in the microwave heating equipment of execution mode 1, the part of structure marks identical label, and it describes the explanation of application implementation mode 1 in detail.
Fig. 5 illustrates the vertical view of the waveguide 106 in the microwave heating equipment of execution mode 3 relative to the configuration status of heating chamber 103, is the figure from top view waveguide 106.In Figure 5, represent heating chamber 103 with single dotted broken line, represent microwave radioactive department 108 with double dot dash line.In Figure 5, although represent the microwave radioactive department 108 represented with double dot dash line with rectangular area, this rectangular area does not limit the shape of microwave radioactive department 108, just represents the forming region that should form opening of microwave radioactive department 108 simply.
In the microwave heating equipment of execution mode 3, as the microwave heating equipment of above-mentioned execution mode 2, on waveguide 103, be provided with the radiation mouth 108c of the microwave radioactive department 108 of radiation circularly polarized wave.But in the microwave heating equipment of execution mode 3, in each microwave radioactive department 108, radiation mouth 108c is arranged on the position about tubular axis P symmetry.By configuring radiation mouth 108c so symmetrically, become the micro-wave structure radiating right-handed polarized wave CW and left-hand polarized wave CCW from the region of each microwave radioactive department 108 in heating chamber 103.As mentioned above, in the microwave heating equipment of execution mode 3, in each microwave radioactive department 108, two radiation mouth 108c, 108c are arranged on the position about tubular axis P symmetry, owing to being such structure, the fore-and-aft direction (from the front face side of heating chamber 103 towards the direction of rear side) therefore becoming heating chamber 103 that can be vertical at the microwave transmission direction MT with waveguide 106 expands further the structure that microwave radiates.In addition, in the microwave heating equipment of execution mode 3, owing to being micro-wave structure of regional radiation right-handed polarized wave CW from each microwave radioactive department 108 and left-hand polarized wave CCW, therefore, it is possible to improve the expansion effect of microwave further in the inside of heating chamber 103.
As mentioned above, in the microwave heating equipment of execution mode 3, by the opening of the radiation mouth 108c as microwave radioactive department 108 being formed as the configuration of the tubular axis P symmetry of the microwave transmission direction MT about waveguide 106, also the device fore-and-aft direction vertical at the microwave transmission direction MT with waveguide 106 can expand microwave further to radiate, make the microwave radiation for heating chamber 103 more even, can irradiate uniformly heating object 102, thus perform efficient microwave heating.
As mentioned above, in the microwave heating equipment of execution mode 3, microwave radioactive department 108 is made up of the radiation mouth 108c of the opening as radiated microwaves, and radiation mouth 108c configures symmetrically about the tubular axis P along microwave transmission direction MT extension in waveguide 106.The microwave heating equipment of the execution mode 3 of formation described above, for the heating region (104) in the direction vertical with the microwave transmission direction MT in waveguide 106, also can carry out microwave radiation more equably.
In addition, in the microwave heating equipment of execution mode 3, the radiation mouth 108b of microwave radioactive department 108 is configured to radiate circularly polarized wave, therefore has the microwave of divergence from microwave radioactive department 108 radiation, can with larger scope to heating object 102 radiated microwaves equably.
As mentioned above, in microwave heating equipment of the present invention, waveguide is configured to, and makes the standing wave wavelength of the standing wave produced in waveguide and to supply from microwave supply unit and the transmission wavelength of the microwave transmitted in waveguide is roughly equal.The microwave heating equipment of the present invention of such formation reliably stably can produce the standing wave of expectation in waveguide.
In addition, in microwave heating equipment of the present invention, microwave transmission distance (c) from the output of microwave supply unit to the end of described waveguide is from the supply of microwave supply unit and the integral multiple of 1/4th of the transmission wavelength (λ g) of the microwave transmitted in waveguide.In the microwave heating equipment of the present invention formed like this, the standing wave (SW) had with the transmission wavelength of the microwave stably transmitted in waveguide (λ g) phase co-wavelength can be produced, even if therefore carry out microwave radiation from microwave radioactive department, the standing wave in waveguide also stably can be maintained.
As mentioned above, in microwave heating equipment of the present invention, the microwave from microwave radioactive department of the heating object radiation configured in heating chamber is configured relative to heating chamber equably as the standing wave produced in waveguide, and microwave radioactive department and this standing wave distribute and configure accordingly, therefore, it is possible to uniform microwave heating is carried out to heating object.
Utilizability in industry
Microwave heating equipment of the present invention can to heating object irradiating microwaves equably, therefore, it is possible to carrying out effectively utilizing in device adding hot working and sterilization etc. etc., and the microwave heating equipment in the various equipment such as heater, garbage disposer, semiconductor-fabricating device that make use of dielectric heating can be applied to.
Label declaration
101 frameworks
102 heating objects
103 heating chambers
104 mounting portions
105 microwave supply units
106 waveguides
107 terminal parts
108 microwave radioactive departments
Claims (13)
1. a microwave heating equipment, this microwave heating equipment has:
The heating chamber of configuration heating object;
Microwave supply unit, it generates the microwave supplied to described heating chamber;
Waveguide, its for microwave transmission that described microwave supply unit is generated to described heating chamber; And
Multiple microwave radioactive department, it is for emitting to described heating chamber by the microwave transmitted in described waveguide,
The end in the microwave transmission direction in described waveguide is closed and described waveguide has the shape of regulation, makes to produce the standing wave with provision wavelengths in described waveguide,
The position of the node of the standing wave existed in region overlapping on the above-below direction of the region shared by described heating chamber with the region shared by described waveguide is configured to become the center of the described microwave radioactive department at the center of the bottom surface being located at described heating chamber.
2. microwave heating equipment according to claim 1, wherein,
Described multiple microwave radioactive department configures roughly symmetrically about the center of the heating region of described heating chamber.
3. microwave heating equipment according to claim 2, wherein,
In the mode that the interval of the standing wave produced in the distance between centers of described multiple microwave radioactive department and waveguide is roughly the same, described waveguide arranges described microwave radioactive department.
4. microwave heating equipment according to claim 3, is wherein configured to,
The node position of the standing wave produced in described waveguide is corresponding with the center of the heating region of described heating chamber.
5. microwave heating equipment according to claim 4, wherein,
The node position of described microwave radioactive department and the interior standing wave produced of described waveguide configures accordingly.
6. microwave heating equipment according to claim 5, wherein,
The standing wave with even number antinode is formed in the region relative with the heating region of described heating chamber in described waveguide.
7. microwave heating equipment according to claim 6, wherein,
Described microwave radioactive department is made up of the opening of radiated microwaves, and this opening configures symmetrically about the tubular axis extended along microwave transmission direction in described waveguide.
8. microwave heating equipment according to claim 6, wherein,
Described microwave radioactive department is made up of the opening of radiated microwaves, and this opening asymmetricly configures about the tubular axis in the microwave transmission direction in described waveguide.
9. the microwave heating equipment according to any one in claim 1 to 8, is wherein configured to,
Roughly the same from the microwave amount of described microwave radioactive department radiation.
10. the microwave heating equipment according to any one in claim 1 to 8, wherein,
Described waveguide is configured to, the standing wave wavelength of the standing wave produced in described waveguide with to supply from described microwave supply unit and the transmission wavelength of the microwave transmitted in described waveguide is roughly equal.
11. microwave heating equipments according to any one in claim 1 to 8, are wherein configured to,
Described microwave radioactive department radiation circularly polarized wave.
12. microwave heating equipments according to any one in claim 1 to 8, wherein,
Microwave transmission distance from the output of described microwave supply unit to the end of described waveguide is from described microwave supply unit supply and the integral multiple of 1/4th of the transmission wavelength of the microwave transmitted in described waveguide.
13. microwave heating equipments according to any one in claim 1 to 8, wherein,
Described waveguide is square waveguide, and be configured to: when set from the supply wavelength of described microwave supply unit supply as the length vertical with the microwave transmission direction of described waveguide being provided with the wall of described microwave radioactive department of λ, described waveguide be a time, the standing wave wavelength X n of the standing wave produced in described waveguide is roughly equal with the transmission wavelength X g by the microwave transmitted in described waveguide shown in following formula (1)
[formula 1]
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| JP2011-081449 | 2011-04-01 | ||
| JP2011081449 | 2011-04-01 | ||
| JP2011250355 | 2011-11-16 | ||
| JP2011-250355 | 2011-11-16 | ||
| PCT/JP2012/002181 WO2012137447A1 (en) | 2011-04-01 | 2012-03-29 | Microwave heating device |
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| CN103477707A CN103477707A (en) | 2013-12-25 |
| CN103477707B true CN103477707B (en) | 2016-03-02 |
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| JP (1) | JP5991595B2 (en) |
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| US10045403B2 (en) | 2012-03-09 | 2018-08-07 | Panasonic Intellectual Property Management Co., Ltd. | Microwave heating device |
| JP2014116175A (en) * | 2012-12-10 | 2014-06-26 | Panasonic Corp | Microwave heating device |
| JP2014135123A (en) * | 2013-01-08 | 2014-07-24 | Panasonic Corp | Microwave heating device |
| JP2015195175A (en) * | 2014-03-25 | 2015-11-05 | パナソニックＩｐマネジメント株式会社 | Microwave processor |
| CN109951912A (en) * | 2018-11-20 | 2019-06-28 | 成都赛纳为特科技有限公司 | Top feedback type micro-wave heating furnace |
| CN109951913A (en) * | 2018-11-20 | 2019-06-28 | 成都赛纳为特科技有限公司 | Laterally uniform microwave oven |
| CN109548221A (en) * | 2018-11-20 | 2019-03-29 | 成都赛纳为特科技有限公司 | Microwave oven with circumference movable roundabout |
| CN109600874A (en) * | 2018-11-20 | 2019-04-09 | 成都赛纳为特科技有限公司 | Double array feed-in type microwave ovens |
| CN109475020A (en) * | 2018-11-20 | 2019-03-15 | 成都赛纳为特科技有限公司 | Array side presents type micro-wave heating furnace |
| CN109951911A (en) * | 2018-11-20 | 2019-06-28 | 成都赛纳为特科技有限公司 | Rectangle battle array presents type micro-wave heating furnace |
| CN109548220A (en) * | 2018-11-20 | 2019-03-29 | 成都赛纳为特科技有限公司 | Basic mode battle array presents type micro-wave heating furnace |
| CN109951914A (en) * | 2018-11-20 | 2019-06-28 | 成都赛纳为特科技有限公司 | Microwave oven with circumference precession turntable |
| CN109548214B (en) * | 2018-12-20 | 2022-02-25 | 广东美的厨房电器制造有限公司 | Microwave oven with a heat exchanger |
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| CN1231397A (en) * | 1998-04-06 | 1999-10-13 | Lg电子株式会社 | Waveguide tube for microwave oven |
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| US4301347A (en) * | 1980-08-14 | 1981-11-17 | General Electric Company | Feed system for microwave oven |
| KR850000580B1 (en) * | 1983-12-31 | 1985-04-29 | 주식회사 금성사 | Uniformity heating device for oven |
| JP3064875B2 (en) * | 1995-07-07 | 2000-07-12 | 松下電器産業株式会社 | High frequency heating equipment |
| JP3808791B2 (en) * | 2001-08-27 | 2006-08-16 | 三菱電機株式会社 | High frequency heating device |
| JP3931623B2 (en) * | 2001-10-29 | 2007-06-20 | 松下電器産業株式会社 | High frequency heating device |
| JP4036052B2 (en) * | 2002-07-30 | 2008-01-23 | 松下電器産業株式会社 | Microwave heating device |
| JP2004139863A (en) * | 2002-10-18 | 2004-05-13 | Hitachi Display Devices Ltd | Microwave heating device |
| JP2004335304A (en) * | 2003-05-08 | 2004-11-25 | Matsushita Electric Ind Co Ltd | High frequency heating device |
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| EP2648479B1 (en) * | 2010-11-29 | 2017-10-25 | Panasonic Corporation | Microwave heater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1231397A (en) * | 1998-04-06 | 1999-10-13 | Lg电子株式会社 | Waveguide tube for microwave oven |
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| WO2012137447A1 (en) | 2012-10-11 |
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