CN200969686Y

CN200969686Y - High-frequency medium heater

Info

Publication number: CN200969686Y
Application number: CN 200620111601
Authority: CN
Inventors: 张建华
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-10-27
Filing date: 2006-10-27
Publication date: 2007-10-31
Anticipated expiration: 2016-10-27

Abstract

The utility model provides a high frequency medium heating machine, comprises a machine box and a inner circuit part, is characterized in that the inner circuit is composed of a power, high voltage rectifier circuit, high frequency oscillation circuit, a control device circuit and a load output circuit which are connected successively; the control circuit connects and controls the high voltage rectifier circuit and the high frequency oscillation circuit via an auxiliary switch circuit. The core of the high frequency oscillation circuit is an oscillation electron tube V7. An FD-911S type electron tube is chosen. The output power of the utility model can realize 100 KW; the utility model can completely satisfy the requirement to hot pressing scuffing and veneer drying treatment on different depth shaving board, veneer board or fiber board. The thermal efficiency is improved by 30 percents. The circuit design is advanced and reasonable and can be realized with the existing electronic components, the working reliability is good. The utility model is provided with convenient operation, is easy to extending and put into practice.

Description

The high-frequency dielectric heater

Technical field

The utility model relates to the heater that is used for thick moulding plane card, glued board and fiber board are carried out hot-press gluing and veneer drying, is specifically related to a kind of high-frequency dielectric heater.Belong to electronic technology field.

Background technology

Produce the wood furniture parts of various panel doors, crooked different shape and the production of glued board and all need to use high frequency heating machine.In the prior art, high-frequency dielectric heater/machine is numerous in variety, structure is different.As Chinese patent 92214549.0 disclosed " a kind of novel high-frequency dielectric heater ", it has done improvement to the oscillating part of existing high-frequency dielectric heater, make it and load matched to change inductance value, substitute expensive limited vacuum tunable capacitor of life-span with fixed capacity, on line design, avoided the influence of load variations the tank road parameter of shaking.But the same with at present all high-frequency dielectric heaters, peak power output still can only reach 30-40KW, obviously can not satisfy the needs that particieboard, glued board or fiber board etc. to various thick types carry out hot-press gluing and veneer drying processing.

The content of utility model

At the prior art above shortcomings, the purpose of this utility model provides a kind of 100KW high-frequency dielectric heater of specially sheet materials such as particieboard, glued board or fiber board of various thick types being carried out hot-press gluing or veneer drying processing.

The purpose of this utility model is achieved in that the high-frequency dielectric heater, comprise cabinet and internal circuit partly, it is characterized in that internal circuit mainly is made of the power supply, high-voltage rectifier, high-frequency oscillating circuits, controller circuitry and the load output circuit that connect successively; Controller circuitry connects control high-voltage rectifier, high-frequency oscillating circuits by auxiliary switching circuit; The core of described high-frequency oscillating circuits is oscillating electron pipe V7, and the anode of oscillating electron pipe V7 joins by the high pressure output of anode choke L1 and high-voltage rectifier, and this high-voltage output end is also by high pressure bypass condenser C1 ground connection; Be connected in series in the anode tank by tank circuit inductance L 3, tank capacitance C6-1, C6-2, an end of tank circuit inductance L 3 connects the anode of V7 oscillating electron pipe, the other end ground connection of tank circuit inductance L 3 through capacitance C9; The tie point of tank capacitance C6-1, C6-2 is regulated inductance L 4 and load capacitance C0 ground connection through matching capacitance C7, output; The negative electrode of oscillating electron pipe V7 meets filament bypass condenser C2-3; The grid of oscillating electron pipe V7 is by the oscillation circuit be made up of feedback capacity C4, feedback inductance L2 and through grid leak resistance R5 and grid capacitance C5 ground connection; Described oscillating electron pipe V7 selects the FD-911S type for use.High-frequency oscillating circuits is provided with aluminium matter shielded box.

Compared to existing technology, the utlity model has following advantage:

1, adopts FD-911S type oscillating electron pipe V7, and the segmentation secondary send high-tension circuit, avoided the impact of surge voltage, power output can realize 100KW, can satisfy the needs that various thick moulding plane cards, glued board or fiber board etc. carried out hot-press gluing and veneer drying processing fully; The heat efficiency improves 30%;

2, circuit design is rationally advanced, adopts existing electronic component to realize, functional reliability is good;

3, aluminium matter shielded box is set, high-frequency oscillating circuits is protected, effectively prolong the useful life of high-frequency dielectric heater;

4, simple in structure, cost is low, and is easy to operate, is easy to promotion and implementation.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model;

Fig. 2 is the circuit theory diagrams of the utility model one execution mode.

Embodiment

The high-frequency dielectric heater, comprise that cabinet and internal circuit are partly, its internal circuit as depicted in figs. 1 and 2, internal circuit is made of main power supply 1, high-voltage rectifier 2, high-frequency oscillating circuits 3 and the load output circuit 5 that connects successively, and high-voltage rectifier 2, high-frequency oscillating circuits 3 connect controller circuitry 4 by auxiliary switching circuit.

Referring to Fig. 2, the core of the high-frequency oscillating circuits 3 of high-frequency dielectric heater is oscillating electron pipe V7, V7 oscillating electron pipe is selected the FD-911S type for use, be connected in series in the anode tank by tank circuit inductance L 3, tank capacitance C6-1, C6-2, one end of tank circuit inductance L 3 connects the anode of V7 oscillating electron pipe, the other end ground connection of tank circuit inductance L 3 through capacitance C9; The tie point of tank capacitance C6-1, C6-2 is regulated inductance L 4 and load capacitance C0 ground connection through matching capacitance C7, output; The anode of oscillating electron pipe V7 joins by the high pressure output of anode choke L1 and high-voltage rectifier, and this high-voltage output end is also by high pressure bypass condenser C1 ground connection; The negative electrode of oscillating electron pipe V7 meets filament bypass condenser C2-3; The oscillation circuit that the grid of oscillating electron pipe V7 passes through to be made up of feedback capacity C4, feedback inductance L2 is through grid leak resistance R5 and grid capacitance C5 ground connection.

High-voltage rectifier 2 constitutes by step-up transformer with by the silicon stack direct current rectification circuit that high-voltage diode constitutes.Among the figure, Q1-Q5 circuit breaker, K1-K A.C. contactor, M1 fan, the M2 water pump, S1-8 button, SQ1-2 position switch, the KT time relay, HL1-5 indicator light, V1-6 silicon rectifier, V7 oscillating electron pipe, Aa anode current table, KV anode voltage table, Ag grid current table, V filament voltage table, KA overcurrent relay, the T high-tension transformer, Ts saturation core regulator, R1-3 starting resistance, the R4 current-limiting resistance, R5 grid leak resistance, C1 high pressure bypass condenser, C2-3 filament bypass condenser, C4 feedback capacity, C5 grid capacitance, the C6 tank capacitance, C7 matching capacitance, L1 anode choke, the L2 feedback inductance, L3 tank circuit inductance, inductance is regulated in L4 output.

The utility model hunting power is 100KW, and frequency of oscillation is 3.39MHZ+10%.

For preventing the influence of high frequency to each components and parts, high-frequency oscillating circuits is located in the aluminium matter shielding cabinet 6, effectively guaranteed the reliability of high-frequency dielectric heater work.

Operating process: put in place when workpiece enters the press press pressure, " height " potential plate can not be collided with " low " current potential in the press, and the air insulation distance more than 2 centimeters is arranged, and carries out following operation then:

1, starts cooling button S2, check whether fan works well, and whether cooling water flow is normal; 2, start one grade of filament voltage S4, filament voltage will rise to about 9 volts from zero volt lentamente this moment, start second gear filament voltage master S6 then, and filament voltage rises to 12 volts; 3, determining of heating time is adjusted to needs to relay on heating time according to technological requirement; 4, start high pressure S7.Adjusting coupling makes the ratio of anode current and grid current between 6: 1 and 5: 1.Notice that grid current can not be lower than 1/7th of anode current.Grid current should not surpass 2A, and anode current can not surpass 12A; 5, in need not heating, press dynamic high-pressure cut-off push button S8 by time relay control when artificially controlling (or) heating time, just stop to heat; 6,4,5 steps of heating repetition for the second time get final product; 7, shut down order for turn-offing high pressure button S8, disconnect one grade of filament S3, disconnect the second gear filament; Cooling is turn-offed cooling fan and water pump more than 5 minutes then.

Operation principle: heating object (referring to that electrical insulator is a medium, as timber, urine aldehyde glue etc.) is placed in the high-frequency electric field, and the molecule of interior of articles will produce the electric polarization of molecule under the effect of electric field force.If the direction of an electric field conversion will make the molecule of polarization to opposite direction polarization, conversion direction of an electric field so repeatedly, the past repolarization of molecule in the object, produce heat energy with regard to making intermolecular phase mutual friction, the strong more just easy more generation heat energy of electric field force, this is the directly principle of heating of object absorbing high-frequency electric energy.It is compared with indirect such as conduction, convection current, has that firing rate is fast, the heat efficiency is high, homogeneous heating, is easy to advantages such as control.Be particularly suitable for extensive use in woodenware industry.

Claims

1, high-frequency dielectric heater comprises cabinet and internal circuit partly, it is characterized in that internal circuit comprises power supply (1), high-voltage rectifier (2), high-frequency oscillating circuits (3), the load output circuit (5) that connects successively; High-voltage rectifier (2) is connected controller circuitry (4) with high-frequency oscillating circuits (3) by auxiliary switching circuit; The core of described high-frequency oscillating circuits (3) is oscillating electron pipe V7, and the anode of oscillating electron pipe V7 joins by the high pressure output of anode choke L1 and high-voltage rectifier, and this high-voltage output end is also by high pressure bypass condenser C1 ground connection; Be connected in series in the anode tank by tank circuit inductance L 3, tank capacitance C6-1, C6-2, an end of tank circuit inductance L 3 connects the anode of oscillating electron pipe V7, the other end ground connection of tank circuit inductance L 3 through capacitance C9; The tie point of tank capacitance C6-1, C6-2 is regulated inductance L 4 and load capacitance C0 ground connection through matching capacitance C7, output; The negative electrode of oscillating electron pipe V7 meets filament bypass condenser C2-3; The grid of oscillating electron pipe V7 is by the oscillation circuit be made up of feedback capacity C4, feedback inductance L2 and through grid leak resistance R5 and grid capacitance C5 ground connection.

2, high-frequency dielectric heater according to claim 1 is characterized in that described oscillating electron pipe V7 selects the FD-911S type for use.

3, high-frequency dielectric heater according to claim 1 is characterized in that described high-frequency oscillating circuits (3) is located in the aluminium matter shielding cabinet (6).