CN2037912U

CN2037912U - High-frequency medium heating machine

Info

Publication number: CN2037912U
Application number: CN 88213647
Authority: CN
Inventors: 张建华; 蒋毅
Original assignee: JIANHUA ELECTROMECHANICAL EQUIPMENT FACTORY JIANGBEI DISTRICT CHONGQING
Current assignee: JIANHUA ELECTROMECHANICAL EQUIPMENT FACTORY JIANGBEI DISTRICT CHONGQING
Priority date: 1988-08-24
Filing date: 1988-08-24
Publication date: 1989-05-17

Abstract

The utility model discloses a high-frequency medium heating machine, which replaces the double-loop common cathode oscillation circuit of an adjustable screen adjusting grid in the traditional high-frequency medium heating machine by a double-loop common grid oscillation circuit. The utility model has the advantages of simple operation, low cost, and wide load matching scope. Besides, the utility model is without parasitic oscillation, and the high voltage can be started under the condition of no load or heavy load. The high-frequency medium heating machine is most suitable for the wood industry and furniture industry.

Description

High-frequency medium heating machine

A kind of novel high-frequency medium heater belongs to the energy technology category in the radiotechnics.

The high-frequency dielectric heater is made up of high-voltage rectifying mechanism, oscillating mechanism, controlling organization and load matched mechanism.The high-frequency dielectric heater is widely used in the industry of timber Family tool, as hot-press gluing plate, bent wooden Family tool, Family tool parts, particieboard etc.Traditional high-frequency dielectric heater because the line design of oscillating mechanism is not too reasonable, adjust difficulty in the use, and load matched scope (being the scope of application) is narrow.

It is simple that task of the present utility model provides a kind of circuit, is easy to adjust, and the scope of application is wide, the novel high-frequency medium heater that cost is low.

Main points of the present utility model are in oscillating mechanism, replace traditional accent screen tuned grid double loop common cathode circuit with the double loop common-gird circuit, thereby have realized the task that the utility model proposed.

Below in conjunction with accompanying drawing, the utility model will be further described

Fig. 1 is a prior art high-frequency dielectric heater oscillator circuit.

Fig. 2 is an oscillator circuit of the present utility model.

Fig. 3 is the ac equivalent circuit of the utility model oscillator circuit.

In Fig. 1 and Fig. 2, dotted line is all represented metal cabinet.

Circuit shown in Figure 1 is the inductance of three-point circuit for transferring screen tuned grid double loop its equivalent electric circuit of common cathode circuit.Adopt this circuit, capacitor C ₁₂With C ₁₃Adjust improper then can not starting of oscillation, one and transfer disorderly and also can cause overcurrent tripping, thereby debugging, operation are difficult.

Oscillator circuit shown in Figure 2 is the double loop common-gird circuit, also is an embodiment of the present utility model, and its ac equivalent circuit is capacitance connecting three point type oscillator as shown in Figure 3.Adopt this circuit, capacitor C ₁₂No matter all can starting of oscillation in any position, thus simple to operate, and matching range is extremely wide.Entire circuit is to connect like this: capacitor C ₁₀, coil L ₄Common port pass through capacitor C ₁₁Link to each other C with the anode of electron tube G ₁₀, L ₄Another common port and coil L ₃An end and the grid of electron tube G link to each other L ₃The other end and capacitor C ₆And resistance R ₆An end link to each other C ₆The other end links to each other with metal cabinet, capacitor C ₅With the grid current Table A _gAfter the parallel connection, an end links to each other with metal cabinet, the other end and resistance R ₆The other end link to each other the indirect capacitor C of the grid of G and negative electrode ₉, the indirect capacitor C of anode and negative electrode ₈, C ₈, C ₉Common port (being a pin of negative electrode) link to each other with metal cabinet, be serially connected with high frequency flow vibration coil L between G anode and metal cabinet successively ₁And capacitor C ₇, L ₁With C ₇Common port links to each other with the rectification output end of high-voltage rectifying mechanism.

C in Fig. 2 ₁₀L ₄Constitute the plate grid loop, C ₉L ₃C ₆Constitute grid-cathode circuit, capacitor C is a filament cathode punching shunt capacitance.Load capacitance C ₀Two interpolars are serially connected with variable capacitance C ₁₂And coil L ₅, capacitor C.One utmost point and capacitor C ₁₂Contact simultaneously link to each other L with metal cabinet ₅C ₁₂C ₀Constitute the load matched resonant tank, coil L ₅By with coil L ₄Mutual inductance obtain electromagnetic-energy, regulate C ₁₂Make C.Obtain rated power, can heat.

The utility model, owing to used new oscillator circuit, thereby have following advantage:

Because capacitor C₁₂No matter all can starting of oscillation in any position, thereby simple to operate, matching range is extremely wide, for example when hot-press gluing plate or Family tool parts, single or multiple lift all can mate, and the heater of prior art can only be mated multilayer;

In addition, the adjustment of load matched resonant tank is subjected to the restriction of mutual inductance, and mutual inductance is suitable, just can make equipment start high pressure under zero load or heavy duty, then charged adjustment C₁₂, make equipment be operated in optimum state, and the equipment of prior art then can't be implemented in the lower high pressure that starts of zero load or heavy duty;

Moreover this circuit does not have condition high-end and that the low side parasitic oscillation produces and does not therefore have the possibility that parasitic oscillation produces, and in the prior art, capacitor C ₁₂C ₁₃Once transfer disorderly, very easily produce parasitic oscillation, influence equipment work;

On the other hand, use this circuit, cost is low.

In sum, owing to used new oscillator circuit, the utlity model has simple to operate, matching range is extremely wide, no parasitic oscillation, can under zero load or heavy duty, start high pressure, and the low advantage of cost, be most appropriate to the industry of timber and Family tool and use.

Claims

1. novel high-frequency medium heater, flow mechanism, oscillating mechanism, controlling organization and load matched mechanism by high gland and form, it is characterized in that oscillator circuit used in the said oscillating mechanism is a so-called double loop common-gird circuit.

2. heater as claimed in claim 1 is characterized in that said double loop is total to the grid circuit and connects as follows: capacitor C ₁₀, coil L ₄A common port through capacitor C ₁₁Link to each other G with electron tube G anode ₁₀L ₄Another common port and coil L ₃An end and electron tube G grid link to each other L ₃The other end and capacitor C ₆And resistance R ₆An end link to each other C ₆The other end links to each other with metal cabinet, capacitor C ₅With the grid current Table A _gAfter the parallel connection, an end links to each other with metal cabinet, the other end and resistance R ₆The other end link to each other the indirect capacitor C of the grid of G and negative electrode ₉The indirect capacitor C of anode and negative electrode ₈, C ₈C ₉Common port (being a pin of negative electrode) link to each other with metal cabinet, be serially connected with high frequency flow vibration coil L between G anode and metal cabinet successively ₁And capacitor C ₇, L ₁With C ₇Common port links to each other with the rectification output end of high-voltage rectifying mechanism.