JPS58120303A - Oscillator and heater of microwave - Google Patents

Abstract

PURPOSE:To ensure the uniform heating for a material to be heated, by applying the anode voltage alternately to a pair of magnetrons through a pair of voltage multiplying amplifiers consisting of capacitors and diodes connected to the secondary side of a boosting transformer. CONSTITUTION:A microstrip line 1 is formed with an earth conductor 3 and a center conductor 4 stuck on the upper and lower surfaces of a dielectric substrate 2 respectively. Plural slits 5 are formed to the conductor 3 along the propagating direction of the micro mu wave, and a ladder pattern 6 is formed. Magnetrons MGTs 16 and 17 are connected to coaxial cables 7 and 8 connected to the line 1, and the micro wave is supplied from both directions A and B. Voltage multiplying rectifiers 22 and 25 consisting of capacitors C21 and C24 and diodes 20 and 23 connected to the secondary side of a boosting transformer 19 are connected to anodes 26 and 27 of the MGTs 16 and 17 respectively. Then the MGTs 16 and 17 oscillate alternately by the alternate charging/discharging of the C21 and C24. Thus the microwave is supplied to the line 1. As a result, a material 15 to be heated which is held between transfer rollers 13 and 14 is heated uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides 51 micro? 8! The present invention relates to improvements in microwave oscillation equipment and microwave heating equipment for supplying.

In the past, a number of microwave heating devices have been proposed that utilize microstrip lines on which ladder patterns are formed (for example, Japanese Patent Application No. 1066-1983, Japanese Patent Application No. 1983-1066).
-1127291. However, since these microwave heating devices supply microwaves only from the ends of the microstrip line, the area near the end of the microwave supply is inevitably heated well, making it difficult to uniformly heat the object. It was a good idea to heat it up.

Therefore, it is possible to supply microwaves from both ends of the micro strip line, but if microwaves are supplied from both ends at the same time, the microwaves supplied from one end and the microwaves supplied from the other end will interfere with each other. Unwanted standing waves are generated, which makes it difficult to achieve uniform heating.

This was done in view of one point noted in the present invention, in which a pair of voltage doubler rectifier circuits consisting of a capacitor and a diode are connected to the secondary side of a step-up transformer, and a magnetron is connected to the output end of each voltage doubler rectifier circuit. A microwave oscillation device is characterized in that an anode current is alternately applied to each magnetron at the same time, and micro-a generated by the microwave heating device is alternately supplied from both ends of a microstrip line. It is a microwave heating device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to one drawing. FIG. 1 is a perspective view showing a microslap line (1). The microstrip line t1) is a tetraful f
a Dielectric material such as Eterene l Two Tenaru & Saka (2), and a grounding conductor (31) made of nickel foil stuck to its top surface.
The center conductor, also made of nickel foil, is attached to the bottom surface (
4; and i2. There is also a ground conductor (31 along the microwave propagation direction).

A plurality of slits (5)... are opened to form a ladder pattern 461. (7) is a coaxial cable attached to one end of the microstrip line (1), which is connected to a magnetron Qel: 1,000 and microwaves are supplied from the direction of arrow A. (8) is a coaxial cable attached to the other end of the microstrip line (11), which is connected to the other magnetron 0ηC, and microwaves are supplied from the arrow 80,000. +91 (11m is the outer conductor of each coaxial cable (7) (8), Oυl is the center conductor, each outer conductor (9) (2) is the microstrip line (11
The center conductor 01G3 is connected to the center conductor (4) of the microstrip line 11). 1] 3Q41 is a pair of transfer rollers for scanning the thin object to be heated 9 on a ladder pattern (61), which rotates while holding the object to be heated II9.

Figures 2 to 4 show the microwave oscillation device. 1
In the figure, the Nishiki #H heater transformer is a step-up transformer. A tap is drawn out approximately at the center of the secondary winding of the step-up transformer 09, and a diode circle and a capacitor 1''&I are connected in series between this tap and one end of the secondary winding.
A voltage doubler rectifier circuit A1 is formed.

Moreover, between the tap and the other end of the secondary winding, there is a die-doro and a capacitor c! in the opposite direction to the guide (2). ! 4 are connected in series to form a second voltage doubler rectifier circuit (2).The output terminal (C) of each voltage doubler rectifier circuit is connected to the magnetron 1161 (positive −α−1 of lη: .Furthermore, the secondary winding of the heater transformer Nishiki is connected in parallel to the heater RA12!J of the magnetron aoon of both swords.

Next, the operation of this embodiment will be explained. As shown in FIG. 2, first, a current flows in the direction of the arrow (2) through the first voltage doubler rectifier port (w!I), and the capacitor υ is charged.

Next, a current flows in the direction of the arrow (■) in FIG. 3, and a positive current of -10,000 gnetron 0 minus twice the voltage is printed I. And the microwave generated from this magnesilon n set 2 is -
Propagate through ten thousand coaxial cables (7).

Micros) From the -10,000 end of the 9-tube line (1) to the arrow A
applied in the direction. At this time, the second voltage doubler rectifier circuit G (
: Current flows in the direction of arrow 0, and the capacitor is charged. After that, two currents flow in the direction of the arrow in Fig. 4, and an anode current with a doubled voltage is applied to the other magnetron aη.Then, the microwave generated by this magnetron 071 propagates through the other coaxial cable (8). Then, a current is applied in the direction of arrow B from the other end of the microstripline line (1).At this time, a current in the direction of arrow ■ flows through the first voltage doubler rectifier circuit ■, and capacitor &l is charged. i
II. The capacitors Qυ(2) of the first and second voltage doubler rectifier circuits alternately repeat the photodischarge, and each time the two magnets (QeG7) alternately oscillate, causing micro (b) Microwaves are alternately supplied from both ends of the 9-tube line (1).

Therefore, if the object to be heated n9 is quantified on the ladder pattern (6) while microwaves are alternately supplied from both ends of the microstrip line +11, the object to be heated 09 will be heated alternately from both sides. . At this time, the power frequency is 60FI
Z, the microwaves are alternately supplied to the microstrip line W/IIm at a rate of 60 times per second, so
The scanning speed of the object to be heated 09 is extremely fast (if not, if it is less than C/sec 501).

There is no heating in stripes. If you want to increase the amount of electricity and speed, it is enough to increase the number of power supplies.

As described above, according to the present invention, since nine microstrip lines can be mutually supplied from both ends of the microstrip line, the object to be heated can be heated uniformly.

Furthermore, since microwaves are not supplied simultaneously from both ends of the microstrip line, no unwanted standing waves are generated.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIGS. 2 to 4 are circuit diagrams showing different operating states of the embodiment. (1)...Microstrip line, +31...
・Grounding conductor (6:...ladder pattern, +71 +
81...Coaxial cable, 0t/heated object, oenrI
... Magnetron% 0t, step-up transformer, clOd
−...Diode, Qυ@...Capacitor, of (
c)...Voltage doubler rectifier circuit. −13=

Claims (1)

[Claims] A capacitor and a die 1- on the secondary side of the lance.
Nine pairs of voltage doubler rectifier circuits are connected. A microwave oscillator device 2 characterized in that a magnetron is connected to the output end of each of the voltage doubler rectifier circuits and a positive current is applied to each magnetron. A pair of voltage doubler FE rectifier circuits consisting of a capacitor and a diode are connected. A magnetron is connected to each output terminal of this voltage doubler rectifier circuit, and at least 10,000 conductors are connected in the microwave propagation direction. A plurality of slits are opened along the line, and one end of the micro strip line with a ladder pattern formed thereon is connected to the output end of the -10,000 magnetron, and the other end of the micro strip line is connected to the other magnetron. A microwave heating device characterized in that micro-TL is alternately supplied from both ends of a micro-strip line by connecting the output ends of the micro-wave strip line and applying a positive current to each magnetron alternately.