CN105227137B - A kind of pesticide-germicide resonant cavity type radio-frequency signal generator - Google Patents
A kind of pesticide-germicide resonant cavity type radio-frequency signal generator Download PDFInfo
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- CN105227137B CN105227137B CN201510662323.1A CN201510662323A CN105227137B CN 105227137 B CN105227137 B CN 105227137B CN 201510662323 A CN201510662323 A CN 201510662323A CN 105227137 B CN105227137 B CN 105227137B
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Abstract
The invention discloses a kind of pesticide-germicide resonant cavity type radio-frequency signal generator, belong to sterilization technology field.Pesticide-germicide resonant cavity type radio-frequency signal generator, including, metal shell, electronics tube chamber, high-frequency resonant cavity, resonant capacitance pole plate, capacitance tuning chamber, output coupling pole plate, using semiclosed body structure distributed constant formed distributed resonance circuit.The advantages that resonant cavity type radio-frequency signal generator of the present invention has simple in construction, easy to adjust, resonant frequency stability height, and cost is low, long lifespan, is easy to be commercialized promotion and implementation.
Description
Technical field
The present invention relates to a kind of pesticide-germicide resonant cavity type radio-frequency signal generator, belong to sterilization technology field.
Background technology
Radio frequency pesticide-germicide technology is a kind of application of frequency medium heating technique, is the principle using dielectric loss to non-
Metal material (grain or food) carries out selective heating and reaches the purpose of pesticide-germicide.Frequency medium heating process is quick,
Uniformly, heat penetration is big, has the characteristics such as selectivity heating, develops it rapidly for a kind of preferable, efficient cold heater meanses.
In grain (or food) pesticide-germicide field, frequency medium heating can optionally be brought rapidly up insect and bacterium, destroy its egg
White matter structure, reach and kill their effect, and the temperature rise of grain (or food) is then relatively small, not only saved nutritional ingredient but also
With good mouthfeel, therefore there is very bright application prospect.Radio-frequency signal generator (or radio-frequency oscillator) is that radio frequency kills
The pith of worm sterilizing unit.
The main composition of radio frequency pesticide-germicide device includes power input portion, high-voltage rectifying part, radio-frequency signal generator portion
Divide, control section and load matched output par, c form.According to relevant national standard, frequency medium heater not only needs
Enough power outputs, it is also necessary to stable frequency (conventional frequency 13.56MHz, 27.12MHz, 40.68MHz).Existing use
Radio frequency pesticide-germicide device, its radio-frequency signal generator largely employs the LC resonance circuits of lumped-parameter element, and loads
Matching output mainly by adjust high pressure vacuum tunable capacitor realize.And the LC resonance circuits of lumped-parameter element are used, by
In the effect of kelvin effect, frequency stability is not high, easy occurrence frequency skew, causes electromagnetism to do neighbouring wireless device
Disturb, and its electrical characteristic to circuit element requires tightened up (need to select that price is higher, the more preferable circuit element of electrical characteristic
Deng), cause the increase of equipment cost.In addition, with the accumulation of device usage time, lumped parameter used in pierce circuit
Element is easier the problems such as aging, electrical characteristic decline (working environment of high frequency causes) occur, whole device can be caused to work
Unstable, operating efficiency reduces, while potential safety hazard be present.In addition, load matched output is adjustable by adjusting high pressure vacuum
What electric capacity was realized, and high pressure vacuum tunable capacitor, expensive (every thousand yuan of 1-2), and restricted lifetime, need to often it change.
After changing every time, adjustment again carried out to device, add cost of equipment maintenance.
The content of the invention
The invention provides a kind of pesticide-germicide resonant cavity type radio-frequency signal generator, including casing metal shell, electron tube
Chamber, high-frequency resonant cavity, resonant capacitance pole plate, capacitance tuning chamber, output coupling pole plate, using semiclosed body structure distributed constant
The distributed resonance circuit of formation;The electronics tube chamber is made up of insulation column and insulation board, radiotron, the insulation branch
Post and insulation board are used to fix radiotron;The resonant capacitance pole plate be located at casing inside of metal outershell electronics tube chamber,
Between high-frequency resonant cavity;The high-frequency resonant cavity includes the Back Word type electrode for being located therein centre, and Back Word type electrode is by Back Word type electricity
Pole inner ring pole plate, Back Word type electrode outer shroud pole plate are formed;The capacitance tuning chamber includes capacitance tuning pole plate, output coupling pole
Plate, insulation column, connected and fed by copper foil between capacitance tuning chamber and high-frequency resonant cavity, and separated by cavity metal partion (metp).
In one embodiment of the invention, the high-frequency resonant intracavitary, the upper surface of Back Word type electrode inner ring pole plate
Together with the upper plane-welding of casing metal shell, lower surface and the outer circumpolar of Back Word type electrode of Back Word type electrode inner ring pole plate
The lower surface of plate overlaps, and Back Word type electrode inner ring pole plate forms the main inductance of high-frequency resonant cavity;Meanwhile the outer circumpolar of Back Word type electrode
Gap between the outer surface of plate and casing metal shell and capacitance tuning cavity be present and form air electric capacity, Back Word type electrode outer shroud
Gap between the lower surface of pole plate and the upper surface of resonant capacitance pole plate be present and form air electric capacity;Two air electric capacity and main inductance
Form high-frequency resonant loop, the major loop as radiotron strength.
In one embodiment of the invention, connected and presented by copper foil between the capacitance tuning chamber and high-frequency resonant cavity
Send, and separated by cavity metal partion (metp), copper foil one end is connected back on the outer surface of font electrode inner ring pole plate close to upper surface
Position, the other end connect the capacitance tuning pole plate of capacitance tuning chamber.
In one embodiment of the invention, the capacitance tuning pole plate is by upper and lower, left and right totally four plane pole plates
Annular connection forms, and is supported by insulation column;Top crown in capacitance tuning pole plate is connected to high-frequency resonant cavity by copper foil
Back Word type electrode inner ring pole plate;Between the outer surface of left pole plate in capacitance tuning pole plate and cavity metal partion (metp), and right pole
Gap be present between the inner surface of plate outer surface and casing metal shell and form electric capacity.
In one embodiment of the invention, the output coupling pole plate is supported by insulation column, with capacitance tuning pole
Gap be present between the inner surface of right pole plate in plate and form electric capacity.
In one embodiment of the invention, the output coupling pole plate is used for the load to radio frequency pesticide-germicide device
Processing chamber feeds radio-frequency power;The position of output coupling pole plate can move left and right, to change it between capacitance tuning pole plate
Gap, that is, change the size of output coupling capacitor value, realize load matched.
In one embodiment of the invention, the resonant capacitance pole plate can finely tune up and down.
In one embodiment of the invention, copper foil and the tie point position of the outer surface of Back Word type electrode inner ring pole plate
It can adjust up and down, so that output impedance best match.
In one embodiment of the invention, the casing metal shell makees grounding.Whole metal shell was both made
For the conductor part of resonant cavity type generator, while it is earth terminal again, a good shielding action is served to high frequency radiation,
High frequency radiation is greatly prevented while reducing manufacturing cost.
In one embodiment of the invention, forced air cooling device is additionally provided with outside the casing metal shell, be used for
Cool down radiotron.
A kind of pesticide-germicide provided by the invention equivalent lumped parameter principle such as Fig. 2 of resonant cavity type radio-frequency signal generator
It is shown, wherein the equivalent parameters principle of semiclosed casing is as shown in figure 3, the structural principle of semiclosed casing is as shown in Figure 4.Radio frequency
Generation circuit is mainly made up of electronics tube chamber and high-frequency resonant cavity, and radiotron works in common cathode state in electronics tube chamber,
Plate grid interelectrode capacity inside radiotron forms feedback circuit, completes the vibration of radiotron jointly with high-frequency resonant cavity
And frequency-selecting.High-frequency resonant cavity is anode resonant groove path, and its resonant frequency is by the resonant capacitance pole plate below high-frequency resonant cavity
Upper-lower position be finely adjusted;The grid resonance tank circuit being made up of the grid-to-cathode capacitance of radiotron with external inductance, adjusts grid
The resonant frequency in pole loop, RF oscillatory circuit is set continually and steadily to work, radio-frequency signal generator produces lasting vibration and power is defeated
Go out.Capacitor resonance chamber is used as high-frequency oscillating circuits and coupled with the tuning of load output circuit, in order to improves harmonic high frequency
Shake the Q values of chamber, so as to realize the stabilization of resonant frequency, while higher-order of oscillation power can be coupled to output circuit, realized negative
Carry the power match with high-frequency resonant cavity.The output coupling pole plate of capacitor resonance intracavitary is connected with load capacitance pole plate, passes through
Adjust the gap between output coupling plate and capacitor resonance cavity wall, you can change the degree of coupling, matched load, reach power output
It is maximum.
Present invention also offers a kind of radio frequency pesticide-germicide device for including the resonant cavity type radio-frequency signal generator, the dress
Putting also includes power input portion, high-voltage rectifying part, control section and load matched output par, c.
The load matched output par, c is incorporated into high-frequency resonant intracavitary.
The resonant cavity type radio-frequency signal generator of this radio frequency pesticide-germicide device has that circuit structure is simple, easy to adjust, vibration
The advantages that frequency stability is high, and cost is low, long lifespan.Adjusted with a relatively high frequency stability, and as a result of double loop
Humorous mode, influence of the capacitance variations to centre frequency is very small caused by output loading, and frequency of oscillation can be stablized in center frequency
Within ± the 0.8% of rate.
Brief description of the drawings
Fig. 1 is the main composition of radio frequency pesticide-germicide device;51 power input portions, 52 high-voltage rectifying parts, 53 radio frequencies
Generator part, 54 load matched output par, cs, 55 control sections.
Fig. 2 is the lumped parameter equivalent circuit figure of this resonant cavity type radio-frequency signal generator.
Fig. 3 is the argument structure equivalent schematic of this resonant cavity type radio-frequency signal generator.1 high-frequency resonant cavity, 2 electronics tube chambers, 3
Capacitance tuning chamber, 4 resonant capacitance pole plates, 5 anode capacitances, 6 output coupling pole plates, 7 radiotrons, 8 load capacitance poles
Plate, 9 casing metal shells, 10 insulation columns and insulation board, 11 coupling copper foil wires.
Fig. 4 is the structure principle chart of this resonant cavity type radio-frequency signal generator.21 anode capacitance access points, 22 casing metals
Shell, 23 high-frequency resonant cavities, 24 resonant capacitance pole plates, 25 electronics tube chambers, 26 insulation columns, 27 output coupling pole plates, 28 electric capacity
Tune pole plate, 29 capacitance tuning chambers, 31 Back Word type electrode inner ring pole plates, 32 Back Word type electrode outer shroud pole plates, 33 cavity metals every
Plate.
Fig. 5 is that the structural diagrams of resonant capacitance pole plate are intended to.
Fig. 6 is that the structural diagrams of output coupling pole plate are intended to.
Fig. 7 is that (41,43 be load capacitance pole plate, and 42 be pending for the output circuit schematic diagram of radio frequency pesticide-germicide system
Material).
Embodiment
The present invention is described in detail for shown embodiment below in conjunction with the accompanying drawings, but it should explanation, these realities
The mode of applying not is limitation of the present invention, those of ordinary skill in the art according to these embodiment institute work energy, method or
Equivalent transformation or replacement in person's structure, are belonged within protection scope of the present invention.
Fig. 2 is the equivalent circuit diagram of this resonant cavity type radio-frequency signal generator, and Fig. 3 is the distribution of this resonant cavity type radio-frequency signal generator
Argument structure equivalent schematic, Fig. 4 are the structure principle chart of this resonant cavity type radio-frequency signal generator.Fig. 2 is Fig. 3 lumped-circuit etc.
Schematic diagram is imitated, Fig. 3 is the distributed constant equivalent schematic that the structure provided by Fig. 4 obtains.In fig. 2, C1For anode shunt
Electric capacity, C2For anode capacitance, C3For anode tank capacitance, C4For grid capacitance, C5For capacitance tuning chamber resonance electricity
Hold, C6For output coupling plate coupled capacitor, C7For grid bypass electric capacity, C0For load capacitance, V is radiotron, and A, G, K divide
Not Wei radiotron anode (anode), grid, negative electrode, R is grid leak resistance, L1For anode choke, L2Adjusted for grid-feedback
Economize on electricity sense, L3For anode tank circuit inductance, L4For grid high frequency choke coil, L5For capacitance tuning chamber resonant inductance.In fig. 2, by electricity
Feel L3, electric capacity C3Form anode resonant groove path, be medium-high frequency cavity resonator structure of the present invention it is equivalent go out lumped circuit, for the
One resonant tank.Inductance L5With electric capacity C5Form resonance circuit, for the present invention in capacitance tuning cavity configuration it is equivalent go out lumped parameter
Circuit, it is the second resonant tank.Output coupling plate coupled capacitor C6With load capacitance C0Ungrounded end connection.Radiotron V's
Anode A passes through anode choke L1Connect with the positive pole of high-voltage rectifying part, negative electrode K one end is directly grounded or connect by electric capacity
Ground, grid G pass through grid-feedback inductance L2One branch road and grid capacitance C4Series connection ground connection, another branch road is through high frequency choke
Enclose L4, grid bypass electric capacity C7, grid leak resistance R ground connection.The feedback capacity of oscillating circuit is by electric between radiotron V screen-grid
Hold CagForm.Because feeder line tie point is located at the hollow battery lead plate of high-frequency resonant cavity between capacitance tuning chamber and high-frequency resonant cavity
(anode tank circuit inductance L3) close to upper plane be casing metal shell (ground connection) place, output coupling plate coupled capacitor C6, load capacitance
C0Change to by C3、L3The influence of the anode tank resonant frequency of composition is little, will not destroy its oscillating condition, its resonance frequency
Rate is also stablized constant.Therefore radio frequency pesticide-germicide device is in the course of the work, load capacitance C0Change (by processing material dielectric
Constant ξ change causes) or coupled capacitor C6Change (due to the needs of matched load), to radio-frequency signal generator resonant frequency
Have little to no effect, device working frequency stability is high.
Fig. 3 be resonant cavity type radio-frequency signal generator of the present invention distributed structures schematic diagram, its circuit feature and connection by
Semi-enclosed body structure shown in Fig. 4 and determine, the intrinsic working frequency of this resonant cavity type radio-frequency signal generator is 27.12MHz
(being determined by cavity body structure), and by adding grid back bias voltage to realize the work and stopping of oscillating circuit.As shown in figure 3, this resonance
The upper-left portion of cavate radio-frequency signal generator is high-frequency resonant cavity 1, lower left part is electronics tube chamber 2, right-hand part is electric capacity
Tuning cavity 3.In electronics tube chamber 2, the V of radiotron 7 is fixed with insulation board and insulating support 10, the V's of radiotron 7
Forced air cooling device (be installed on the present apparatus outside) of the cooling dependent on bottom installation.
B-B sectional views are the schematic diagram of high-frequency resonant cavity 1 of resonant cavity type radio-frequency signal generator of the present invention in Fig. 4.High-frequency resonant
Chamber 1 is formed by Back Word type battery lead plate and its relative position structure between cabinet shell metal.Back Word type electrode inner ring pole plate
31 be hollow square body, and the side of plane four and the metal shell of plane on casing are welded as a whole (ground connection) thereon, this pad
For the sole support face of whole Back Word type electrode.Back Word type electrode outer shroud pole plate 32 is made up of big hollow square column, four sides
Uniform gap is kept between casing metal shell 22 and cavity metal partion (metp) 33 (ground connection), upper plane hollow out, lower plane is with returning
The lower plane of font electrode inner ring pole plate 31 overlaps, and is welded into one.The access point of anode capacitance 21 is electric from Back Word type
The lower plane of pole plate is through anode capacitance C2, the anode A of radiotron 7 is connected to by copper foil wire 11.In high-frequency resonant
In chamber 1, circumpolar plate lights supreme plane (ground connection) by the access of anode capacitance 21 and is equivalent to Fig. 2 electricity within Back Word type electrode 31
Road Anodic tank circuit inductance L3, the Coupling point of high-frequency resonant cavity 1 and capacitance tuning chamber 3 is located at the inner ring of the pole plate of Back Word type electrode 31
Some position of the close upper plane of pole plate side, equivalent to inductance L3Tap, the position can adjust up and down, so that output
Best match is realized in impedance.Four sides of Back Word type electrode outer shroud pole plate 32 and casing metal shell 22 and cavity metal partion (metp)
Uniform gap between 33 be present, form electric capacity, while the lower plane of Back Word type electrode outer shroud pole plate 32 is with being fixed on high-frequency resonant
Gap be present between metal partion (metp) (resonant capacitance pole plate 24, as shown in Figure 5) between chamber 1 and electronics tube chamber 2, form electric capacity,
Above electric capacity synthesis is equivalent to anode tank capacitance C3.Because resonant capacitance pole plate 24 and the multiple spot of casing metal shell 22 reliably join
Connect, and the position of resonant capacitance plate 24 can move up and down, i.e. its gap with the lower plane of Back Word type electrode outer shroud pole plate 32
It can finely tune, thus anode tank capacitance C3Trimmer value can be realized, makes anode resonant frequency adjusted.
Capacitance tuning chamber 3 is combined as one by four pieces of plate electrodes and is integrally formed, as shown in Figure 4.Wherein upper plane and under
Plane pole plate is fixed with the upper surface of casing and lower surface respectively by insulation column, is insulated with metal shell.Upper plane and under
Plane and the gap of cabinet shell are very big, and it forms electric capacity and can be ignored, and left plane pole plate with right plane pole plate (adjust by electric capacity
Humorous pole plate 28) certain gap between cavity metal partion (metp) 33 and casing metal shell 22 respectively be present, main body capacitive is formed,
It is equivalent to capacitance tuning chamber resonant capacitance C in Fig. 25;Four pieces of pole plates form a loop and form inductance, the electricity being equivalent in Fig. 2
Hold tuning cavity resonant inductance L5.In the inner side of capacitance tuning chamber 3, output coupling pole plate 27 is (as shown in Figure 6) solid with insulation column 26
It is fixed, gap be present with the right conductor pole plate of capacitance tuning chamber 3 and form electric capacity, be equivalent to output coupling capacitor C in Fig. 26, it is left
Move right the position of adjustable output coupling plate 27, you can change C6Size, carry out load matched, adjustment whole device reach
Maximum power output, the vacuum tunable capacitor of costliness was both eliminated, and be easy to adjustment again and safeguard.Radio frequency is exported by copper foil wire 11
One end is connected on output coupling plate 27, and the other end is connected to load capacitance C0On top crown, load capacitance C0Bottom crown and case
Body metal shell 22 is connected.Casing metal shell 22 makees grounding, and whole casing metal shell 22 is both used as resonant cavity type
The conductor part of generator, while be earth terminal again, a good shielding action is served to high frequency radiation, reduces manufacture
High frequency radiation is greatly prevented while cost.
On the basis of above-mentioned implementation, preferably casing and each conductor plate are the pure aluminum plate that thickness is 5mm, and copper foil uses
Thickness 0.2mm copper foil tape.
Although the present invention is disclosed as above with preferred embodiment, it is not limited to the present invention, any to be familiar with this skill
The people of art, without departing from the spirit and scope of the present invention, it can all do various change and modification, therefore the protection model of the present invention
Enclose being defined of being defined by claims.
Claims (8)
- A kind of 1. pesticide-germicide resonant cavity type radio-frequency signal generator, it is characterised in that including casing metal shell, electronics tube chamber, High-frequency resonant cavity, resonant capacitance pole plate, capacitance tuning chamber, output coupling pole plate, using semiclosed body structure distributed constant shape Into distributed resonance circuit;The electronics tube chamber is made up of insulation column and insulation board, radiotron, the insulation column It is used to fix radiotron with insulation board;The resonant capacitance pole plate is located at electronics tube chamber, the height of casing inside of metal outershell Between frequency resonator;The high-frequency resonant cavity includes the Back Word type electrode for being located therein centre, and Back Word type electrode is by Back Word type electrode Inner ring pole plate, Back Word type electrode outer shroud pole plate are formed;The capacitance tuning chamber include capacitance tuning pole plate, output coupling pole plate, Insulation column, connected and fed by copper foil between capacitance tuning chamber and high-frequency resonant cavity, and separated by cavity metal partion (metp);It is described Casing metal shell is grounded, and forced air cooling device is additionally provided with outside the casing metal shell, for cooling down radiotron.
- A kind of 2. pesticide-germicide resonant cavity type radio-frequency signal generator according to claim 1, it is characterised in that the high frequency In resonator, the upper surface of Back Word type electrode inner ring pole plate is together with the upper plane-welding of casing metal shell, Back Word type electricity The lower surface of pole inner ring pole plate overlaps with the lower surface of Back Word type electrode outer shroud pole plate, and Back Word type electrode inner ring pole plate forms high frequency The main inductance of resonator;Meanwhile the outer surface of Back Word type electrode outer shroud pole plate and casing metal shell and capacitance tuning cavity it Between exist gap formed air electric capacity, deposited between the lower surface of Back Word type electrode outer shroud pole plate and the upper surface of resonant capacitance pole plate Air electric capacity is formed in gap;Two air electric capacity form high-frequency resonant loop with main inductance, as radiotron strength Major loop.
- A kind of 3. pesticide-germicide resonant cavity type radio-frequency signal generator according to claim 1, it is characterised in that the electric capacity Connected and fed by copper foil between tuning cavity and high-frequency resonant cavity, and separated by cavity metal partion (metp), copper foil one end connection Back Word On the outer surface of type electrode inner ring pole plate the capacitance tuning pole plate of capacitance tuning chamber is connected close to the position of upper surface, the other end.
- A kind of 4. pesticide-germicide resonant cavity type radio-frequency signal generator according to claim 1, it is characterised in that the electric capacity By upper and lower, left and right, totally four plane pole plate annular connections form tuning pole plate, are supported by insulation column;Capacitance tuning pole plate In top crown the Back Word type electrode inner ring pole plate of high-frequency resonant cavity is connected to by copper foil;Left pole plate in capacitance tuning pole plate Between outer surface and cavity metal partion (metp), and gap be present simultaneously between right pole plate outer surface and the inner surface of casing metal shell Form electric capacity.
- A kind of 5. pesticide-germicide resonant cavity type radio-frequency signal generator according to claim 1, it is characterised in that output coupling Pole plate is supported by insulation column, gap is present between the inner surface of the right pole plate in capacitance tuning pole plate and is formed electric capacity.
- A kind of 6. pesticide-germicide resonant cavity type radio-frequency signal generator according to claim 1, it is characterised in that the output Coupling plates are used to feed radio-frequency power to the load processing chamber of radio frequency pesticide-germicide device;The position of output coupling pole plate can be left Move right, to change its gap between capacitance tuning pole plate, that is, change the size of output coupling capacitor value, realize load Match somebody with somebody.
- 7. a kind of radio frequency pesticide-germicide device for including any resonant cavity type radio-frequency signal generators of claim 1-6, its feature It is, in addition to power input portion, high-voltage rectifying part, control section and load matched output par, c.
- 8. radio frequency pesticide-germicide device according to claim 7, it is characterised in that the load matched output par, c is whole Close in high-frequency resonant intracavitary.
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CN106985496B (en) * | 2017-04-28 | 2019-03-08 | 江门市联兴高频设备有限公司 | A kind of frequency generating apparatus of high frequency binding machine |
CN109921745B (en) * | 2019-04-02 | 2023-07-18 | 无锡旭洲智能科技有限公司 | Side output type radio frequency resonance generator and insecticidal sterilization device |
CN111660571A (en) * | 2020-05-22 | 2020-09-15 | 福州三矩机电设备有限公司 | Method and device for reducing high-frequency radiation for pedal type high-frequency machine |
CN113839682B (en) * | 2021-09-26 | 2023-02-28 | 哈工大机器人(合肥)国际创新研究院 | Miniaturized multipurpose radio frequency resonance generating device |
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