CN1592829A

CN1592829A - Electronic igniting circuit for oil burner

Info

Publication number: CN1592829A
Application number: CNA018238815A
Authority: CN
Inventors: K·彼得森
Original assignee: Danfoss AS
Current assignee: Danfoss AS
Priority date: 2001-12-14
Filing date: 2001-12-14
Publication date: 2005-03-09
Anticipated expiration: 2021-12-14
Also published as: AU2001298080A1; US20050042563A1; WO2003052322A1; ATE352752T1; EP1454096B1; CN1254632C; KR100632766B1; EP1454096A1; DE60126362T2; KR20040074074A; DE60126362D1

Abstract

The present invention relates to an electronic ignition circuit for oil burners, in particular a high voltage high frequency ignition circuit, said circuit comprising an oscillator and a high frequency high voltage transformer wound on a core. The core on which the high frequency transformer is wound forms a substantially closed magnetic path for the magnetic flux generated by the winding of the transformer, when current flows through the windings.

Description

The electronic igniting circuit that is used for oil burner

The present invention relates to a kind of electronic igniting circuit that is used for oil burner, particularly high voltagehigh frequency firing circuit, wherein circuit comprises oscillator and centers on core body high-frequency converter of reeling and the converter that is used for sort circuit.

Adopt electronic igniting circuit in the oil burner that in being often used in the house in single room, heats.

In this burner, air blast produces air-flow, and oil is ejected in the air-flow so that form mist of oil in air-flow by injection nozzle.For a fuel oil, the pilot spark gap is positioned near the injection nozzle, when not too close nozzle.Usually spark gap is positioned at the downstream of air blast and injection nozzle with respect to air-flow.But the distance on airflow direction from the injection nozzle to the spark gap is very little, for example about 1-2 millimeter.Injection nozzle and spark gap are crossing offset slightly on the direction of air-flow usually, arrive the electrode of spark gap so that prevent mist of oil.Other configurations are certainly arranged.Particularly, spark gap can be positioned at the upstream of injection nozzle.But importantly the pilot spark gap is enough away from injection nozzle or away from the mist of oil location, so that prevent that unburned oil forms cigarette ash in the mist of oil on electrode.

On the other hand, spark gap must the close enough injection nozzle location make the electric arc that forms in the spark gap in fact arrive mist of oil and it lighted.When electric arc was formed between the electrode of spark gap, it was out of shape by air-flow especially easily, thereby extends in the mist of oil downstream.But this has cooled off electric arc, and is merely able to lingeringly put fuel spray under certain conditions, perhaps can not light mist of oil at all.In both cases, unburned oil product blows in the environment, pollutes thus.

As mentioned above, The present invention be more particularly directed to the high voltagehigh frequency firing circuit.Expression is used to produce the known electronic circuitry of electric arc in Fig. 1.Circuit comprises the spark gap G that is connected on high voltagehigh frequency converter T1 secondary.High-frequency converter T1 is wound on the ferrite post.Can in US-A-4683518, find the example of this high-frequency and high-voltage converter.Electronic circuit is combined with oscillating circuit R1, R2, R3, R4, C3, C4, C5, C6, DZ1, DZ2, TR1 and T1.Should be noted that converter T1 is connected with the bottom of transistor T R1, so that provide oscillator required feedback.

Electronic circuit also comprises half-wave rectifying circuit D1, C2 and noise suppression circuit L1, C1, R5, R6, and it is uncorrelated with the present invention that its details are thought, and will not describe in further detail.

Half-wave rectified current from half-wave rectifier is fed to oscillator, and produces high-frequency impulse for high-frequency converter T1.

Working well for many years although have the prior art igniting unit of described circuit, the size of parts causes restriction for the size of igniting unit in the circuit.The size of unit also limits the degree of freedom of its location.Limiting both and causing restriction for the size of burner of the size of unit and location makes it be difficult to make compact burner.

First purpose of the present invention is to make compacter oil burner.

Second purpose of the present invention is to improve the igniting of oil burner.

According to a first aspect of the present invention, these purposes satisfy by the electronic igniting circuit of the described oil burner of opening paragraph, it is characterized in that when electric current flow through winding, the core body that is wound with high-frequency converter was formed for the roughly closed magnetic circuit of the magnetic flux of converter winding generation.

Be formed for the core body of the roughly closed magnetic circuit of magnetic flux by use, not only owing to reduce the size of core body itself but also, reduce the size of converter significantly owing to the size that reduces winding.

According to the preferred embodiments of the present invention, core body comprises two parts, between two parts the gap is set.

This can assemble converter easily.

In first preferred embodiment, core body comprises at least one roughly core body and york piece of E shape.

In second preferred embodiment, core body also comprises second core body of E shape roughly.

In the 3rd preferred embodiment, the gap is formed between the central shank and york piece of E core body.

More than all embodiment improved in the use pierce circuit and to have used the transistorized advantage of MOS-FET.

Therefore, in another preferred embodiment of electronic circuit, oscillator comprises the MOS-FET transistor.

Use the transistorized advantage of MOS-FET to be that it saves energy more than traditional polarization transistor, therefore help the electronic circuit overall efficiency, in addition, make the bigger deflection of electric arc.

According to a second aspect of the present invention, provide a kind of burner that comprises described electronic circuit.

According to a third aspect of the present invention, relate to and in the electronic igniting circuit of oil burner, use the high voltagehigh frequency converter, it comprises the roughly core body of closed magnetic circuit of the magnetic flux that is formed for the generation of converter winding when electric current flows through winding.

The present invention will and be described with reference to the accompanying drawings in further detail by non-limiting example, in the accompanying drawing:

Fig. 1 is the schematic diagram of the electronic igniting circuit of oil burner;

Fig. 2 is the perspective view of the partial section of closed core body roughly, and core body is used for the preferred embodiments of the present invention so that be formed for the roughly closed magnetic circuit of the magnetic flux that the converter winding produces;

Fig. 3 is the schematic diagram in the pilot spark gap of oil burner; And

Fig. 4 a-4c is illustrated in the ignition arc under the different tests condition.

Fig. 1 is the schematic diagram of the electronic igniting circuit of oil burner.Except the high voltagehigh frequency converter T1 that is replaced by high voltagehigh frequency converter T1 ' in the present invention, this circuit is corresponding with prior art circuits.Purpose promptly has two roughly the same accompanying drawings in order to avoid for convenience, carries out reference for Fig. 1 in literal of the present invention, only uses T1 ' to replace T1.

As mentioned above, circuit comprises the spark gap G that is connected on high voltagehigh frequency converter T1 ' secondary.The spark gap of burner is away from the igniting unit location that comprises electronic circuit, and electronic circuit comprises high voltagehigh frequency converter T1 '.Electronic igniting circuit is combined with oscillating circuit R1, R2, R3, R4, C3, C4, C5, C6, DZ1, DZ2, TR1 and T1 '.Should be noted that converter T1 ' and the bottom of transistor T R1 are coupled, so that provide oscillator required feedback.

Converter T1 ' represents with perspective view and partial section in Fig. 2.Converter T1 ' has the roughly closed core body 1 that comprises two

parts

1a and 1b, and these parts are identical in a preferred embodiment, and both are roughly E shape and both are ferrite material.Two parts are arranged with the structure of opposite mirror image.For convenience's sake, will be described below in the E shape one.The middle leg 2 of E is preferably cylindrical, so that match with the cylindrical tube 3 that is wound with winding 4a, 4b, 4c.Two outer legs 5 of E are the square-section basically.But preferably the inboard is crooked, with reference to figure 2, so that match with the external shape of cylindrical shell 3.Be apparent that the outside also can be crooked, making its cross section is the arc section that the external shape with cylindrical shell 3 matches.Middle leg 2 is slightly shorter than two outer legs 5.Therefore, when two the outer legs 5 of

parts

1a, 1b abuts separately, between middle leg 2, form gap 6.

Interconnect part 7 convergent slightly between outer legs 5 and the middle leg 2, so that have the trapezoid cross section.

On cylindrical shell 3, four windings are positioned at suitable groove.Two secondary high pressure winding 4b and 4c are arranged, its each be distributed between a plurality of grooves, three secondary winding that are used for each structure in Fig. 2 are so that reduce voltage between the adjacent turn.Two secondary winding are connected in series, so that have mid point between them.In burner, this mid point can use the metal parts ground connection of burner, reduces Danger Electric shock risk thus, and undesirable spark is transmitted to the danger on the combustor component.Another groove is arranged in cylindrical shell 3, wherein be positioned with elementary low pressure winding 4a.The coupling winding 4d (not shown among Fig. 2) and the elementary winding 4a that are connected to transistor T R1 bottom are positioned at together.

In a preferred embodiment, employed core body is a pair of by Iskra Feriti, the core component of ETD 45G 19 14 07-50 that Ljubljana, Slovenia provide.Use these two core components to provide about 1 mm clearance.The overall dimensions of each core component approximately is 19.6 millimeters * 7.4 millimeters.The overall weight that provides core body is about 13.4 grams, for the rod-type core body that present applicant adopts, alleviates the weight of about 16 grams.

In addition, use the roughly this core body of closed magnetic circuit of the magnetic flux that when electric current flows through winding, is formed for the generation of converter winding, reduce the required copper quantity of converter winding and be about 20%.

Consider above-described preferred embodiment, what deserves to be mentioned is that herein roughly closure can not be interpreted as the magnetic circuit that comprises complete closure.The magnetic circuit of this complete closure can not provide advantage of the present invention, is understood in the description of the test that this will provide below.

In addition, use the core body of the present invention of the roughly closed magnetic circuit that is formed for magnetic flux to utilize the MOS-FET transistor npn npn as the transistor T R1 in the oscillating circuit.MOS-FET produces steeper flank in the higher-order of oscillation that forms, and forms bigger arc deflection, as following in conjunction with as described in Fig. 4 a-4c.In addition, use the MOS-FET transistor to save energy more.

Although be further noted that and use a pair of identical core component in a preferred embodiment, can also use the structure of other core components, promptly the structure of two of core body parts can be any traditional type, for example C-I, C-C, E-I, E-C, E-E or C-T.

Fig. 3 represents spark gap G, and 12,13 and two terminals 14 and 15 of two electrodes wherein are so that be connected on igniting converter T1 ' secondary via the cable (not shown).When high pressure acted on the spark gap, plasma-arc was formed between the

electrode

12,13.

Part is owing to begin described air-flow, and electric arc is by the electrode that blows off.The electric arc of air-flow cooling simultaneously.Have been found that the blown off distance of spark gap of in given air-flow electric arc depends on high voltagehigh frequency converter T1 ' in the electronic igniting circuit.

Fig. 4 a-4c represents the ignition arc under the experimental condition, and the different high voltagehigh frequency converters in adopting the electronic circuit that inserts Fig. 1 are tested.Darker region representation discharges the isoionic centre gangway of high brightness of the heat of white light, and gray area is represented the luminous isoionic outside cloud of colder blue/white.Ratio is about the 0-2 decimetre.

Fig. 4 a represents if the electric arc that uses closed core body to realize for the high voltagehigh frequency converter.Fig. 4 b represents the electric arc that adopts prior art high voltagehigh frequency converter to be realized.The electric arc that Fig. 4 c represents to use the high voltagehigh frequency converter of preferred embodiment to realize, it is 1 millimeter that this embodiment uses the core component of ETD 45G 1914 07-50 and gap.

As can be seen, in Fig. 4 b firing circuit, use under the situation of prior art converter T1 the plasma luminescence cloud to extend and leave about 13 millimeters of eletrode tip.If use according to converter of the present invention, about 15 millimeters of eletrode tip is left in the luminous cloud extension of Fig. 4 c ionic medium.On the other hand, if use the converter with closed core body, only deflection and luminous cloud only extend and leave about 5 millimeters of electrode electric arc slightly.

Therefore, the present invention not only provides the isoionic more long arc of blue/white that arrives in the mist of oil so that light a fire, and arc channel institute of the white heat central authorities reach that uses the present invention to realize is the same far away with the distance that the colder blue/white plasma that uses prior art is reached.

Therefore realize that mist of oil is lighted better.

Claims

1. electronic igniting circuit that is used for oil burner, high voltagehigh frequency firing circuit particularly, described circuit comprises oscillator and the high-frequency converter of reeling around core body (1) (T1 '), it is characterized in that, when electric current flow through winding (4a-4d), the core body (1) that is wound with high-frequency converter was formed for the roughly closed magnetic circuit of the magnetic flux that the winding (4a-4d) of converter (T1 ') produces.

2. electronic igniting circuit as claimed in claim 1 is characterized in that, core body comprises two parts (1a, 1b), and gap (6) is set between two parts.

3. as each described electronic igniting circuit of above-mentioned claim, it is characterized in that core body comprises at least one core body of E shape (1a) and york piece (1b) basically.

4. electronic igniting circuit as claimed in claim 3 is characterized in that, york piece (1b) comprises second roughly core body of E shape.

5. as each described electronic igniting circuit of claim 3-4, it is characterized in that gap (6) are formed between the center leg and york piece (1b) of E core body (1a).

6. as each described electronic igniting circuit of above-mentioned claim, it is characterized in that core body (1) is the ferrite core body.

7. as each described electronic igniting circuit of above-mentioned claim, it is characterized in that oscillator comprises MOS-FET transistor (TR1).

8. as each described electronic igniting circuit of above-mentioned claim, it is characterized in that the weight of core body (1) is less than 14 grams.

9. comprise oil burner as above-mentioned each described electronic igniting circuit of claim.

10. in the electronic igniting circuit of oil burner, use high-frequency converter (T1 '), converter (T1 ') comprises core body (1), when electric current flow through winding (4a-4d), core body (1) was formed for the roughly closed magnetic circuit of the magnetic flux that the winding (4a-4d) of converter (T1 ') produces.

11. be used for the high-frequency ignition converter of oil burner, it is characterized in that, converter (T1 ') comprises core body (1), and when electric current flow through winding (4a-4d), core body (1) was formed for the roughly closed magnetic circuit of the magnetic flux that the winding (4a-4d) of converter (T1 ') produces.

12. high-frequency ignition converter as claimed in claim 11 is characterized in that, core body comprises two parts (1a, 1b), and gap (6) is set between two parts.

13., it is characterized in that core body (1) is the ferrite core body as claim 11 or 12 described high-frequency ignition converters.

14., it is characterized in that the weight of core body (1) is less than 14 grams as each described high-frequency ignition converter of claim 11-13.