CN210291985U - Protective structure in microwave oven solid source and magnetron co-heating system - Google Patents
Protective structure in microwave oven solid source and magnetron co-heating system Download PDFInfo
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- CN210291985U CN210291985U CN201921299041.XU CN201921299041U CN210291985U CN 210291985 U CN210291985 U CN 210291985U CN 201921299041 U CN201921299041 U CN 201921299041U CN 210291985 U CN210291985 U CN 210291985U
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Abstract
The utility model discloses a protective structure among microwave oven solid state source and magnetron common heating system, microwave oven includes double-source microwave heating cavity, the one end of double-source microwave heating cavity is provided with microwave waveguide exciter, with the magnetron microwave source that microwave waveguide exciter is connected to and the entry is presented to the waveguide, the other end of double-source microwave heating cavity be provided with solid-state microwave source power amplifier, with the radio frequency coaxial antenna is transferred to electricity that solid-state microwave source power amplifier is connected. Compared with the prior art, the utility model discloses can effectively protect the solid-state source power amplifier of 900MHz, reduce 2.45GHz microwave energy loss simultaneously, very big promotion double-source microwave heating system's security and efficiency.
Description
Technical Field
The utility model relates to a microwave oven heating technical field, in particular to a protective structure in a microwave oven solid state source and magnetron heating system together.
Background
The traditional microwave oven adopts a 2.45GHz magnetic control technology, the technology is mature, the cost is low, but the defects of insufficient heating depth, poor uniformity, uncontrollable output power and the like exist; the 900MHz frequency is lower, the penetrability is good, but the traditional 900MHz magnetron design is large in size, the design size of a waveguide transmission port cannot be applied to a miniaturized cavity, in recent years, a 900MHz microwave source designed by a solid source is small in size, and a mode of feeding in a resonant antenna is adopted, so that the dual-frequency coexistence in the small cavity heating is possible.
However, when dual frequencies coexist in the same cavity, the problem of mutual coupling of microwave energy exists, 2.45GHz can inhibit low-frequency 900MHz microwaves from entering a waveguide port due to waveguide transmission characteristics, but 900MHz antennas are difficult to completely isolate high-frequency 2.45GHz, and there is a great risk that the high-frequency 2.45GHz microwaves return through the antennas and damage the 900MHz solid-state source.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a protective structure among solid-state source of microwave oven and the common heating system of magnetron aims at restraining the antenna coupling of high frequency 2.45GHz to the solid-state source of 900MHz with lower cost, improves energy efficiency to effectively protect the solid-state source power amplifier of 900 MHz.
In order to realize the above object, the utility model provides a protective structure among microwave oven solid state source and the magnetron co-heating system, microwave oven includes dual-source microwave heating cavity, dual-source microwave heating cavity's one end is provided with microwave waveguide exciter, with the magnetron microwave source that microwave waveguide exciter is connected to and the waveguide is presented the mouth, dual-source microwave heating cavity's the other end be provided with solid-state microwave source power amplifier, with radio frequency coaxial antenna is transferred to the electricity that solid-state microwave source power amplifier is connected.
The utility model discloses a further technical scheme is, electricity radio frequency coaxial antenna adjust through shielding ball axle sleeve install in the top of double-source microwave heating cavity, electricity radio frequency coaxial antenna adjust through the radio frequency transmission cable with solid-state microwave source power amplifier is connected.
The further technical proposal of the utility model is that the microwave waveguide exciter is connected with the magnetron microwave source through a microwave waveguide transmission cable.
The utility model discloses a further technical scheme is, solid-state microwave source power amplifier still is provided with high-power low pass filter with electricity between the coaxial antenna of adjusting the radio frequency.
The further technical proposal of the utility model is that the utility model is characterized by also comprising an oven door connected with the double-source microwave heating cavity.
The utility model has the advantages that: the utility model discloses protective structure among the solid-state source of microwave oven and the magnetron concurrent heating system is through electricity modulation radio frequency coaxial antenna and dual source microwave heating cavity for low frequency 900MHz and high frequency 2.45GHz can be in same cavity microwave heating simultaneously, effectively improve the shortcoming that traditional 2.45GHz heating penetrability and homogeneity are not enough. In addition, the high-frequency suppression by designing a high-power low-pass filter reaches over 28dB, so that the power of a magnetron is 1 kilowatt (60dBm), the power of the magnetron, which is coupled to a 900MHz solid-state source power amplifier through an antenna, is also less than 2 watts (32dBm), and the power is far lower than the safety margin of a solid-state source power tube. Through the design, the 900MHz solid-state source power amplifier can be effectively protected, the 2.45GHz microwave energy loss is reduced, and the safety and the efficiency of the double-source microwave heating system are greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a protective structure in a heating system for a solid source and a magnetron of a microwave oven according to the present invention;
FIG. 2 is a schematic structural diagram of a high-power low-pass filter in a protection structure of a microwave oven solid-state source and magnetron co-heating system according to the present invention;
FIG. 3 is a schematic model diagram of an electrically tunable RF coaxial antenna in a protective structure of a microwave oven solid-state source and magnetron co-heating system according to the present invention;
FIG. 4 is a schematic diagram of the distribution of near-field electromagnetic field of the electrically tunable RF coaxial antenna in the protection structure of the microwave oven solid-state source and magnetron co-heating system of the present invention;
FIG. 5 is a schematic diagram of the resonance mode of the dual-source microwave heating cavity at 900MHz in the protection structure of the microwave oven solid-state source and magnetron co-heating system of the present invention;
FIG. 6 is a schematic diagram of the resonant mode of the dual-source microwave heating cavity at 2.45GHz in the protection structure of the microwave oven solid-state source and magnetron co-heating system of the present invention;
FIGS. 7 and 8 are schematic diagrams of RF performance indexes of a high-power low-pass filter in a protection structure of a microwave oven solid-state source and magnetron co-heating system according to the present invention;
FIG. 9 is a schematic diagram of the field intensity of the protection structure in the heating system for the solid source and the magnetron of the microwave oven when 900MHz high power traveling wave signal passes through the microstrip line of the high power low pass filter.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | Double-source |
7 | Shielding |
| 2 | Microwave waveguide exciter | 8 | Radio |
| 3 | Magnetron |
9 | Microwave |
| 4 | Waveguide feed-through | 10 | High-power low- |
| 5 | Solid-state microwave |
11 | Furnace door |
| 6 | Electrically-tunable radio frequency coaxial antenna |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 to 9, the present invention provides a protection structure in a heating system for a solid source and a magnetron of a microwave oven.
As shown in fig. 1, the utility model provides a protective structure among microwave oven solid state source and the common heating system of magnetron includes dual-source microwave heating cavity 1, wherein, dual-source microwave heating cavity 1's one end is provided with microwave waveguide exciter 2, with magnetron microwave source 3 that microwave waveguide exciter 2 is connected to and the waveguide is presented and is gone into mouth 4, dual-source microwave heating cavity 1's the other end be provided with solid-state microwave source power amplifier 5, with radio frequency coaxial antenna 6 is transferred to the electricity that solid-state microwave source power amplifier 5 is connected.
It should be noted that the electrically tunable rf coaxial antenna 6 is used for feeding low-frequency 900MHz microwave energy into the dual-source microwave heating cavity 1 with optimal matching. The double-source microwave heating cavity 1 obtains the low-frequency 900MHz optimal matching size according to HFSS simulation, and simultaneously meets the size requirement of a multi-mode field generated by 2.45GHz on the double-source microwave heating cavity 1.
Further, the utility model discloses in, electricity radio frequency coaxial antenna 6 electricity adjust through shielding ball axle sleeve 7 install in the other end of double-source microwave heating cavity 1, electricity radio frequency coaxial antenna 6 electricity adjust through radio frequency transmission cable 8 with solid-state microwave source power amplifier 5 is connected.
The microwave waveguide exciter 2 is connected with the magnetron microwave source 3 through a microwave waveguide transmission cable 9.
Furthermore, as shown in fig. 2, in the present invention, a high-power low-pass filter 10 is further disposed between the solid-state microwave source power amplifier and the electrically tunable rf coaxial antenna. The circuit design of the high-power low-pass filter 10 achieves 1 kilowatt of power, the isolation index of high frequency 2.4GHz-2.5GHz reaches-28 dB, and the low frequency difference loss of 900MHz is less than 0.1 dB.
Furthermore, the protection structure of the co-heating system of the solid source and the magnetron of the microwave oven of the present invention further comprises an oven door 11 connected to the dual-source microwave heating cavity 1.
The utility model provides an electricity is transferred radio frequency coaxial antenna 6, low frequency 900MHz adopts electricity to transfer dull and stereotyped radiating antenna, forms the resonant cavity at 900MHz with double-source microwave heating cavity 1, and the resonant cavity forms the best feed-in of microwave energy through adjusting electricity transfer dull and stereotyped radiating antenna's feed-in position at 900MHz frequency channel. An antenna model of the electrically tunable radio-frequency coaxial antenna 6 is shown in fig. 3.
The distribution of the near-field electromagnetic field of the electrically-tunable radio-frequency coaxial antenna 6 is shown in fig. 4, after the energy of the electrically-tunable radio-frequency coaxial antenna 6 is fed in, a low-impedance loop is formed due to the action of the dielectric constant of the food material, the higher the dielectric constant is, the lower the impedance is, and the energy of the electromagnetic field reaches the food material through the low-impedance loop to heat the food material.
The utility model discloses the size of the dual-source microwave heating cavity 1 in the protective structure in the microwave oven solid-state source and magnetron concurrent heating system can satisfy 900MHz microwave energy resonant mode best feed-in, can satisfy again that traditional 2.45GHz magnetron passes through the waveguide mouth and has aroused many mode fields in the cavity.
As shown in fig. 5, the resonant mode of the cavity at 900MHz can be seen by designing the dual-source microwave heating cavity 1 through simulation, and the selection of the resonant mode frequency point can be realized by adjusting the feeding position of the electrically tunable antenna. Meanwhile, the double-source microwave heating cavity 1 is designed through simulation, a resonant mode of the cavity at 2.45GHz can be obtained, and as can be seen from fig. 6, the 2.45GHz microwave realizes a multi-mode field in the double-source microwave heating cavity 1.
Therefore, the double-source microwave heating cavity 1 realizes double-source feeding of low frequency 900MHz and high frequency 2.45GHz, can realize high-efficiency low-frequency feeding through the 900MHz electric adjusting radio frequency coaxial antenna 6, and can coexist with the traditional magnetron scheme to realize multi-mode double-source field microwave energy heating.
The utility model discloses in, high-power low pass filter 10 adopts microstrip low pass filter form, places between 900MHz solid-state source power amplifier output and the electric coaxial antenna of adjusting radio frequency 6, and the radio frequency performance index is shown in figure 7 and figure 8.
According to the HFSS simulation data, the high-power low-pass filter 10 has 28dB inhibition at 2.45GHz, the power of a magnetron 1000W signal is about 2W after the magnetron 1000W signal is coupled into a port of the high-power low-pass filter 10 from the electrically-tuned radio frequency coaxial antenna 6, and the 2W power is totally reflected at a power amplifier port and then is released to the ground at an open circuit terminal of the high-power low-pass filter 10. The open end is equivalent to a short circuit to the ground capacitor at the antenna port through a half-wavelength, and 2.45GHz signals are restrained. For 900MHz signals with the wavelength less than 1/4, the capacitance to ground is equivalent to high impedance at the electrically-adjusted radio frequency coaxial antenna 6, thereby not influencing the insertion loss of the 900MHz signals.
The field intensity of 900MHz high-power traveling wave signals passing through the high-power low-pass filter 10 microstrip line is shown in FIG. 9, the maximum field intensity is 24KV/M, and the breakdown field intensity of an AD255A board is 48KV, so that the board can bear high power.
The utility model has the advantages that: the utility model discloses protective structure among the solid-state source of microwave oven and the magnetron concurrent heating system is through electricity modulation radio frequency coaxial antenna and dual source microwave heating cavity for low frequency 900MHz and high frequency 2.45GHz can be in same cavity microwave heating simultaneously, effectively improve the shortcoming that traditional 2.45GHz heating penetrability and homogeneity are not enough. In addition, the high-frequency suppression by designing a high-power low-pass filter reaches over 28dB, so that the power of a magnetron is 1 kilowatt (60dBm), the power of the magnetron, which is coupled to a 900MHz solid-state source power amplifier through an antenna, is also less than 2 watts (32dBm), and the power is far lower than the safety margin of a solid-state source power tube. Through the design, the 900MHz solid-state source power amplifier can be effectively protected, the 2.45GHz microwave energy loss is reduced, and the safety and the efficiency of the double-source microwave heating system are greatly improved.
The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (5)
1. The protection structure in the microwave oven solid source and magnetron co-heating system is characterized in that the microwave oven comprises a double-source microwave heating cavity, one end of the double-source microwave heating cavity is provided with a microwave waveguide exciter, a magnetron microwave source connected with the microwave waveguide exciter and a waveguide feed-in port, and the other end of the double-source microwave heating cavity is provided with a solid microwave source power amplifier and an electrically-adjusted radio frequency coaxial antenna connected with the solid microwave source power amplifier.
2. The protective structure of claim 1, wherein the electrically tunable RF coaxial antenna is mounted to the top end of the dual-source microwave heating cavity through a ball-shielding sleeve, and is connected to the solid-state microwave source via a RF transmission cable.
3. A shield structure in a microwave oven solid state source and magnetron co-heating system as claimed in claim 1, wherein said microwave waveguide driver is connected to said magnetron microwave source by a microwave waveguide transmission cable.
4. The protective structure of claim 1, wherein a high-power low-pass filter is further disposed between the solid-state microwave source power amplifier and the electrically tunable RF coaxial antenna.
5. A shield structure in a microwave oven solid state source and magnetron co-heating system as claimed in claim 1, further comprising an oven door connected to said dual source microwave heating cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921299041.XU CN210291985U (en) | 2019-08-12 | 2019-08-12 | Protective structure in microwave oven solid source and magnetron co-heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921299041.XU CN210291985U (en) | 2019-08-12 | 2019-08-12 | Protective structure in microwave oven solid source and magnetron co-heating system |
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| Publication Number | Publication Date |
|---|---|
| CN210291985U true CN210291985U (en) | 2020-04-10 |
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| CN201921299041.XU Active CN210291985U (en) | 2019-08-12 | 2019-08-12 | Protective structure in microwave oven solid source and magnetron co-heating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110360604A (en) * | 2019-08-12 | 2019-10-22 | 深圳市博威射频科技有限公司 | Safeguard structure in micro-wave oven Solid Source and the common heating system of magnetron |
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2019
- 2019-08-12 CN CN201921299041.XU patent/CN210291985U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110360604A (en) * | 2019-08-12 | 2019-10-22 | 深圳市博威射频科技有限公司 | Safeguard structure in micro-wave oven Solid Source and the common heating system of magnetron |
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