CN208590130U - A kind of microwave heating equipment using phasescan - Google Patents

A kind of microwave heating equipment using phasescan Download PDF

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Publication number
CN208590130U
CN208590130U CN201820968683.3U CN201820968683U CN208590130U CN 208590130 U CN208590130 U CN 208590130U CN 201820968683 U CN201820968683 U CN 201820968683U CN 208590130 U CN208590130 U CN 208590130U
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China
Prior art keywords
waveguide
microwave
phase shifter
phasescan
output
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Withdrawn - After Issue
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CN201820968683.3U
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Chinese (zh)
Inventor
毋明旗
刘宁
卢晓颖
徐翔新
罗鹏
张峰
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Kunshan jiuhua electronic equipment factory
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Kunshan jiuhua electronic equipment factory
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Abstract

The utility model relates to a kind of microwave heating equipments using phasescan, including microwave generator, waveguide power distributor, waveguide phase shifter, microwave applications cavity, no less than 2 secondary microwave antennas and phasescan control system;The waveguide power distributor has the output of (N >=2) road N, and at least output is connect with waveguide phase shifter all the way;Microwave antenna is divided into N group, and the input of at least one group and the output of waveguide phase shifter connect, and the input of other groups of antennas and the output of waveguide power distributor are directly connected to;The input port of the waveguide phase shifter to the phase difference between output port be continuously adjustable;Phasescan control system adjusts the phase shift angle of the waveguide phase shifter with given speed;By the phase difference between different groups of antennas of scanning, realizes the movement of microwave field density, feeble field region in microwave applications cavity, improve the uniformity of heating;The utility model power capacity is big, is suitble to industrial microwave large-scale production application.

Description

A kind of microwave heating equipment using phasescan
Technical field
The utility model belongs to microwave technical field, particularly a kind of microwave heating equipment using phasescan.
Background technique
Microwave heating is to act on polar molecule using microwave field, swings it quickly, collision friction causes interior energy to be promoted To achieve the purpose that heating.Since microwave wavelength is much larger than infrared ray, penetration depth is deep, can be done directly on inside material Without heat transfer, therefore have energy transmission speed fast, the low advantage of slippages.In addition, this material spontaneous heating Heating mechanism, system thermal inertia is small, and heating starts and stops reaction speed fastly, it can be achieved that flexible control.
In practical application, since the metal boundary effect of microwave applications cavity and the dielectric property of material influence, cause Microwave field distribution in material has apparent strength distribution variation, causes the cold and hot subregion of heating obvious, heating effect is uneven It is even.This is the intrinsic physical characteristic of microwave field distribution, and influences the principal element of microwave heating application effect.
To improve this inhomogeneities, more common method includes: that material is stirred movement, such as CN 204122002U public affairs The continuous-type microwave heating Double shaft stirring device opened;Utilize multimode cavity, it is desirable to which the strength distribution of different mode forms complementation, allusion quotation A kind of multi-modal microwave heating equipment as disclosed in CN106686792A of type;Change the intracorporal field mould of chamber using model perturbation Formula, to change the position in cold and hot area;Its radiation field distribution is set to form strong and weak complementation using the distributing position of microwave energy-feeding antenna, The microwave heating equipment as disclosed in CN104125669A;And it is swept using solid state microwave sources, multiple groups antenna using amplitude and phase It retouches, to change field distribution in microwave cavity, so as to improve its uniformity, a kind of microwave as disclosed in CN205017622U is filled It sets and microwave heating equipment.
Above-mentioned measure has certain improvement in specific applications, but has certain limitation.Such as: material The method of movement of stirring is suitable only for liquid or granular material;The method of multimode cavity and model perturbation, due to material dielectric Characteristic and complex-shaped, is difficult theoretically to analyze whole modes, thus be difficult to judge how many mode in final cavity, How is the uniformity of field distribution;Multiple antennas distribution energy regenerative, due to the effect of metal cavity boundary condition, effect and freely sky Between it is different, finally still have apparent cold and hot area's distribution;Solid Source provides good amplitude and phase control characteristic, but at present Still without the example for more than tens, hundred kilowatts high-power industrial applications.
Utility model content
The purpose of this utility model is to propose one further to improve the homogeneity question in industrial microwave heating application Kind uses the microwave heating equipment of phasescan, is mainly characterized by, and passes through waveguide power distributor and waveguide phase shifter, realizes Phase difference scanning in heating system between mutiple antennas, to control in microwave applications cavity, microwave field distribution is strong, weak-strong test It is mobile, reach the uniform purpose of Energy distribution;The utility model power capacity is big, can be used for high-power industrial microwave heating.
In order to achieve the above objectives, the utility model adopts the following technical solution:
A kind of microwave heating equipment using phasescan, including microwave generator, waveguide power distributor, waveguide phase shift Device, microwave applications cavity, no less than 2 secondary microwave antennas and phasescan control system;It is characterized in that, the microwave hair The output of raw device is connect with the input of waveguide power distributor;The waveguide power distributor has the output of (N >=2) road N, feature It is at least to export all the way and is connect with the waveguide phase shifter;It is further characterized in that the input port of the waveguide phase shifter It is continuously adjustable to the phase difference between output port;The microwave antenna is divided into N group, it is characterised in that at least one group The input of antenna is connect with the output of the waveguide phase shifter, and the input of other groups of antennas divides with other waveguide powers respectively The output of orchestration connects;The radiation port of the microwave antenna faces the inside of the microwave applications cavity, by microwave energy feed-in In the intracorporal material of microwave applications chamber;It is further characterized in that the phasescan control system is continuously adjusted with given speed The phase shift angle of the waveguide phase shifter.
Preferably, the waveguide power distributor has the distribution output of 2 tunnels, wherein output connects with waveguide phase shifter all the way It connects;The microwave antenna is divided into two groups, and the input of one group of microwave antenna is connect with the output of the waveguide phase shifter, and another group micro- The output that wave antenna inputs with the waveguide power distributor is directly connected to;It is characterized in that, the microwave applications cavity and two Group microwave antenna connection, and two groups of microwave antennas are distributed in the two sides of material, i.e. the intracorporal material of microwave applications chamber is located at two groups On line between microwave antenna, the radiation direction of two groups of microwave antennas is opposite, irradiates two sides of material.
Preferably, the waveguide power distributor has the distribution output of 2 tunnels, wherein output connects with waveguide phase shifter all the way It connects;The microwave antenna is divided into two groups, and the input of one group of microwave antenna and the output of waveguide phase shifter connect, another group of microwave day The input of line and the output of the waveguide power distributor are directly connected to;It is characterized in that, the microwave applications cavity with it is described Two groups of microwave antennas are connected and are distributed in the same side of the intracorporal material of microwave applications chamber by certain spacing;Described two groups micro- The radiation direction of wave antenna is identical or close.
Preferably, the waveguide phase shifter includes one and matches double T and be also also known as evil spirit T), two short-circuit plungers and a length For the waveguide of a quarter waveguide wavelength;A transverse arm port of the evil spirit T is connect with short-circuit plunger, another transverse arm port with The waveguide of a quarter waveguide wavelength connects, then connect with short-circuit plunger;The face the H branch section of the evil spirit T is used as waveguide phase shifter Input, then E-plane branch is that waveguide phase shifter exports or E-plane branch is inputted as waveguide phase shifter, then the face H branch is as wave Lead phase shifter output;Described two short-circuit plunger location of short circuit having the same, keep synchronizing moving in phase adjustment process. Preferably, the short-circuit plunger includes waveguide, piston and pull rod;One end of the waveguide is input terminal, and the other end is short circuit Face;The piston is located in waveguide cavity, and the rectangular box of one end open, the cross section of the rectangular box are surrounded by metal plate Shape is similar to waveguide cross-section, but undersized, it is ensured that piston and waveguide inner wall are without directly contacting;The four of the rectangular box A face is respectively parallel to two broadsides and two narrow sides of waveguide, and the 5th face is perpendicular to waveguide axial direction, and close waveguide is defeated Enter end, and another is open close to waveguide short face and perpendicular to the face of waveguide axial direction;The rectangular box shape piston Length in the axial direction is about a quarter waveguide wavelength;The pull rod is cylindrical body, the axis and waveguide axis of the cylindrical body Line is overlapped, and one end passes through the circular hole on the short-circuit face of the waveguide, protrude into waveguide in the waveguide external, the other end, and from The open one end of the rectangular box shape piston enters internal piston, connect with the 5th face of rectangular box shape piston solid It is fixed;In the waveguide external using pull rod described in motor or other power device push/pulls, piston edge inside waveguide is driven The movement of waveguide axis direction, realizes the adjusting of short road surface position.Preferably, the phasescan control system includes stepping electricity Machine, controllor for step-by-step motor and control single chip computer;The stepper motor is connect with the short-circuit plunger pull rod of the waveguide phase shifter, Pull rod is driven to move along waveguide axial direction;The controllor for step-by-step motor receives the control signal of the control single chip computer, operation step It is operated into motor, realizes phasescan.
Due to the application of the above technical scheme, the utility model has the advantage that compared with prior art
A kind of microwave heating equipment using phasescan of the utility model is moved using waveguide power distributor and waveguide Phase device realizes the scanning of phase difference between different group antennas in microwave action cavity, thus real in the case where not mobile material Strong, weak-strong test movement, reaches and is evenly heated purpose in existing microwave field, and power capacity is big, is suitble to large-scale industrial microwave applications.
Detailed description of the invention
Fig. 1 is the principles of the present invention block diagram;
Fig. 2 is that the microwave applications cavity of the utility model embodiment 1 and microwave antenna constitute schematic diagram;
Fig. 3 is the waveguide phase shifter schematic diagram of the utility model embodiment 1;
Fig. 4 is the short-circuit plunger structural schematic diagram of the utility model embodiment 1;
Fig. 5 (a) be the utility model embodiment 1-phase quadrature when Energy distribution simulation result;
Energy distribution simulation result when Fig. 5 (b) is -60 ° of differences of the utility model embodiment 1;
Energy distribution simulation result when Fig. 5 (c) is -30 ° of differences of the utility model embodiment 1;
Energy distribution simulation result when Fig. 5 (d) is 0 ° of difference of the utility model embodiment 1;
Energy distribution simulation result when Fig. 5 (e) is 30 ° of differences of the utility model embodiment 1;
Energy distribution simulation result when Fig. 5 (f) is 60 ° of differences of the utility model embodiment 1;
Energy distribution simulation result when Fig. 5 (g) is the phase quadrature of the utility model embodiment 1;
Fig. 5 (h) is the Energy distribution simulation result after all phase condition cumulative means of the utility model embodiment 1;
Fig. 6 is the composition schematic diagram of the utility model embodiment 2;
Fig. 7 is the Energy distribution simulation result of the utility model embodiment 2.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and embodiments.
A kind of microwave heating equipment using phasescan of the utility model, principle is as shown in Figure 1, include microwave Device 11, waveguide power distributor 12, waveguide phase shifter 13, phasescan control system 14, microwave antenna 15, microwave applications cavity 16 and material 17.
The microwave power that microwave generator 11 generates is assigned as the output of (N >=2) road N through waveguide power distributor 12, wherein At least output is connect with waveguide phase shifter 13 all the way;Microwave antenna 15 divides for N group, wherein the input of one group of microwave antenna 151 with The output of waveguide phase shifter 13 connects, and the input of other groups of microwave antennas 152 and the delivery outlet of waveguide power distributor 12 are direct Connection.Waveguide phase shifter 13 can continuously adjust the phase difference being input between output.Phasescan control system 14 is according to setting Speed adjustment waveguide phase shifter 13 phase, realize the variation of phase difference between antenna sets 151 and 152, then microwave applications chamber Field distribution changes with the variation of phase difference in body 16, realizes the movement of microwave field density, feeble field region in material 17.
The utility model embodiment 1 uses three distributor of magnetron microwave generator and waveguide power, and the magnetron is micro- Wave producer and three distributor of waveguide power are the universal component of Microwave Industry application field, and characteristic and index do not constitute this reality Apply the feature of example.The present embodiment uses microwave applications cavity and microwave antenna as shown in Figure 2, which cuts Face is rectangle, and the bottom surface that tabular material 22 is parallel to the microwave applications cavity is placed, and apart from the microwave applications cavity bottom surface Certain altitude.Microwave antenna 23 includes three Waveguide slot antennas being placed in parallel, and wherein the antenna of the leftmost side and the rightmost side is One group 231, input terminal is directly connect with two output ports of three distributor of waveguide power;The input of intermediate antenna 232 After connecting with waveguide phase shifter, then a delivery outlet of device is divided to connect with waveguide power three.
The microwave antenna of the present embodiment includes waveguide, and gap 233 and pyramidal loudspeaker 234 form, and waveguide is general Rectangular waveguide, narrow side are parallel to the top surface of microwave applications cavity 21, and have rectangular aperture 233 in narrow side, and microwave energy is passed through Rectangular aperture 233 is fed into microwave applications cavity.
Pyramidal loudspeaker 234 are made of metal plate, and lesser mouth face is located at the top of microwave applications cavity 21, and surrounds Three gaps of three radiating guides;Biggish mouth is facing towards the material inside microwave applications cavity 21.
The waveguide phase shifter of the present embodiment 1 is constituted as shown in figure 3, include evil spirit T 31, two short-circuit plungers 32 and one Length is the connection waveguide 33 of a quarter waveguide wavelength.A transverse arm port 313 of evil spirit T31 is connect with short-circuit plunger 32, After another transverse arm port 314 is connect with waveguide 33, then it connect with short-circuit plunger.The H branch port 311 of evil spirit T31 can be used as Total input port, then the port 312 of E branch is total output port, and vice versa.
The short-circuit plunger structure of the waveguide phase shifter of the present embodiment 1 is as shown in figure 4, include waveguide 41, piston 42 and pull rod 43.411 short circuit of a port of the waveguide, another port 412 is used as input terminal.Piston 42 is located in waveguide cavity, by metal Plate surround one end open, tool there are five face rectangular box, the cross-sectional shape and waveguide cross-section of the rectangular box It is similar, but undersized, with waveguide inner wall without directly contacting;Four faces of the rectangular box are respectively parallel to two of waveguide Broadside and two narrow sides, the 5th face 421 is perpendicular to waveguide axial direction, and close to waveguide input terminal, and another is close to waveguide Short-circuit face and be open perpendicular to the face of waveguide axial direction;The length of the rectangular box shape piston in the axial direction is about A quarter waveguide wavelength;The pull rod 43 is cylindrical body, and the axis of the cylindrical body is overlapped with waveguide axis, and one end is in the wave Lead outside, the other end passes through the circular hole on the short-circuit face 411 of the waveguide, protrudes into waveguide, and from the rectangular box shape The open one end of piston enters internal piston, is connected and fixed with the 5th face 412 of rectangular box shape piston;In the waveguide Pull rod described in external push/pull drives the piston to move inside waveguide along waveguide axis direction, realizes the tune of short road surface position Section.
Fig. 5 is normalized energy distribution map of the present embodiment in different antennae phase difference, and Fig. 5 (a)~Fig. 5 (g) is respectively Phase from by -90 °~90 ° at interval of 30 ° of variations when normalized energy, it can be seen that with the variation of phase, microwave field By force, feeble field distributed areas move in the horizontal direction.After the corresponding Energy distribution cumulative mean of each phase difference, final energy Distribution is as shown in Fig. 5 (h), it is seen that its uniformity is greatly improved than single phase condition.
The utility model embodiment 2 is as shown in Figure 6.Difference from Example 1 is that microwave generator exports and waveguide The connection of two distributor of power.Microwave antenna 62 includes 6 Waveguide slot antennas being placed in parallel, wherein 3 are one group of composition 621, positioned at the upper surface of microwave applications cavity 61, in addition three form one group 622, positioned at the lower surface of microwave applications cavity; Material 63 is located between two groups of microwave antennas, the spoke of the radiation direction of first group of microwave antenna 621 and second group of microwave antenna 622 It is opposite to penetrate direction.Every group of microwave antenna respectively connects with three output ports of three distributor of waveguide power (being not drawn into figure) It connects.After the input of any three distributor of waveguide power is connect with waveguide phase shifter, then with two distributor of waveguide power An output connection;The input of another three distributor of waveguide power is directly connect with the output of two distributor of waveguide power. The phase shift angle of waveguide phase shifter is adjusted, then the phase difference between antenna sets 621 and antenna sets 622 changes, and makes microwave field By force, the distributed areas of feeble field move in the vertical direction, and improve the uniformity of vertical direction.
Fig. 7 is that 2 phase difference of embodiment changes between -180 °~180 °, the knot in material after Energy distribution cumulative mean Fruit, it can be seen that the distribution of Feeble field is obviously reduced.
Above-described is only some embodiments of the utility model.For those of ordinary skill in the art, Without departing from the concept of the present invention, various modifications and improvements can be made, these belong to practical Novel protection scope.

Claims (8)

1. a kind of microwave heating equipment using phasescan, including microwave generator, waveguide power distributor, waveguide phase shift Device, microwave applications cavity, no less than 2 secondary microwave antennas and phasescan control system;It is characterized in that, the microwave hair The output of raw device is connect with the input of waveguide power distributor;The waveguide power distributor has the output of the road N, N >=2, wherein extremely Rare output all the way is connect with the waveguide phase shifter;The input port of the waveguide phase shifter is to the phase between output port Difference is continuously adjustable;The microwave antenna is divided into N group, and inputting at least one group antenna is defeated with the waveguide phase shifter It connects out, the input of other groups of antennas is connect with the output of other waveguide power distributors respectively;The microwave antenna Radiation port, will be in the intracorporal material of microwave energy feed-in microwave applications chamber towards the inside of the microwave applications cavity;The phase Bit scan control system continuously adjusts the phase shift angle of the waveguide phase shifter with given speed.
2. a kind of microwave heating equipment using phasescan as described in claim 1, it is characterised in that: the waveguide power Distributor has the distribution output of 2 tunnels, wherein output is connect with the input of the waveguide phase shifter all the way;The microwave antenna is divided into Two groups, the input of one group of microwave antenna is connect with the output of the waveguide phase shifter, the input of another group of microwave antenna with it is described The output of waveguide power distributor is directly connected to;The microwave applications cavity is connect with two groups of microwave antennas, and two groups of microwave days Line is distributed in the two sides of the intracorporal material of microwave applications chamber, i.e., the described intracorporal material of microwave applications chamber is located at two groups of microwave antennas Between line on, the radiation direction of two groups of microwave antennas is opposite, irradiates two sides of material.
3. a kind of microwave heating equipment using phasescan as described in claim 1, it is characterised in that: the waveguide power Distributor has the distribution output of 2 tunnels, wherein output is connect with the input of the waveguide phase shifter all the way;The microwave antenna is divided into Two groups, the input of one group of microwave antenna is connect with the output of the waveguide phase shifter, the input of another group of microwave antenna with it is described The output of waveguide power distributor is directly connected to;The microwave applications cavity is connect with two groups of microwave antennas, and two groups micro- Wave antenna is distributed in the same side of the intracorporal material of microwave applications chamber with certain spacing;The radiation direction phase of two groups of antennas It is same or close.
4. a kind of microwave heating equipment using phasescan as described in claims 1 or 2 or 3, it is characterised in that: the wave Leading phase shifter includes the waveguide that the double T of a matching, two short-circuit plungers and a length are a quarter waveguide wavelength;Described A transverse arm port with double T is connect with short-circuit plunger, another transverse arm port is connect with the waveguide of a quarter waveguide wavelength, It is connect again with short-circuit plunger;The face the H branch section for matching double T is inputted as waveguide phase shifter, then E-plane branch is waveguide phase shift Device output or E-plane branch are inputted as waveguide phase shifter, then the face H branch exports as waveguide phase shifter;Described two short circuits Piston location of short circuit having the same, keeps synchronizing moving in phase adjustment process.
5. a kind of microwave heating equipment using phasescan as claimed in claim 4, it is characterised in that: the short-circuit plunger Including waveguide, piston and pull rod;One end of the waveguide is input terminal, and the other end is short-circuit face;The piston is located at waveguide It is intracavitary, the rectangular box of one end open, cross-sectional shape and the waveguide cross-section phase of the rectangular box are surrounded by metal plate Seemingly, but undersized, it is ensured that piston and waveguide inner wall are without directly contacting;Four faces of the rectangular box are respectively parallel to waveguide Two broadsides and two narrow sides, the 5th face is perpendicular to waveguide axial direction, and close to waveguide input terminal, and another is close to wave It leads short-circuit face and is open perpendicular to the face of waveguide axial direction;The length of the rectangular box shape piston in the axial direction is about For a quarter waveguide wavelength;The pull rod is cylindrical body, and the axis of the cylindrical body is overlapped with waveguide axis, and one end is in the wave Lead outside, the other end passes through the circular hole on the short-circuit face of the waveguide, protrudes into waveguide, and from the rectangular box shape piston Open one end enters internal piston, is connected and fixed with the 5th face of rectangular box shape piston;Make in the waveguide external The pull rod described in motor or other power device push/pulls, drives the piston to move inside waveguide along waveguide axis direction, real The adjusting of existing short road surface position.
6. a kind of microwave heating equipment using phasescan as described in claims 1 or 2 or 3, it is characterised in that: the phase Bit scan control system includes stepper motor, controllor for step-by-step motor and control single chip computer;The stepper motor and the waveguide The short-circuit plunger pull rod of phase shifter connects, and pull rod is driven to move along waveguide axial direction;The controllor for step-by-step motor receives the control The control signal of single-chip microcontroller processed, operation stepper motor operating, realizes phasescan.
7. a kind of microwave heating equipment using phasescan as claimed in claim 4, it is characterised in that: the phasescan Control system includes stepper motor, controllor for step-by-step motor and control single chip computer;The stepper motor and the waveguide phase shifter Short-circuit plunger pull rod connection, drive pull rod moved along waveguide axial direction;The controllor for step-by-step motor receives the control monolithic The control signal of machine, operation stepper motor operating, realizes phasescan.
8. a kind of microwave heating equipment using phasescan as claimed in claim 5, it is characterised in that: the phasescan Control system includes stepper motor, controllor for step-by-step motor and control single chip computer;The stepper motor and the waveguide phase shifter Short-circuit plunger pull rod connection, drive pull rod moved along waveguide axial direction;The controllor for step-by-step motor receives the control monolithic The control signal of machine, operation stepper motor operating, realizes phasescan.
CN201820968683.3U 2018-06-22 2018-06-22 A kind of microwave heating equipment using phasescan Withdrawn - After Issue CN208590130U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108668398A (en) * 2018-06-22 2018-10-16 昆山九华电子设备厂 A kind of microwave heating equipment using phasescan
CN111031620A (en) * 2019-11-12 2020-04-17 四川大学 Method and device for realizing microwave zone heating by using single solid-state source frequency modulation
CN112976627A (en) * 2021-03-11 2021-06-18 德星技术(苏州)有限公司 Reverse osmosis element filter screen and preparation process thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108668398A (en) * 2018-06-22 2018-10-16 昆山九华电子设备厂 A kind of microwave heating equipment using phasescan
CN108668398B (en) * 2018-06-22 2024-04-30 昆山九华电子设备厂 Microwave heating device adopting phase scanning
CN111031620A (en) * 2019-11-12 2020-04-17 四川大学 Method and device for realizing microwave zone heating by using single solid-state source frequency modulation
CN112976627A (en) * 2021-03-11 2021-06-18 德星技术(苏州)有限公司 Reverse osmosis element filter screen and preparation process thereof

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