DE8306612U1 - PRESSURE SPRAYER NOZZLE FOR HEATING SYSTEMS - Google Patents

Description

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DIPL-ING. GUIDO ENGELHARDT PATEIITANWALTY

7990 Friedrichshafen

Satronic AG

CH - 81o5 Regensdorf

Pressure atomizer nozzle for heating systems

The invention relates to a pressure atomizer nozzle for heating systems, with a one-part or multi-part Nozzle body, to which the oil to be atomized via flow channels incorporated in these or associated intermediate pieces is supplied and emerges as an oil mist from a nozzle opening.

With such atomizer nozzles occurs after the burner has been switched off and during the heating up of the one to be burned Oil in an uncontrolled manner from the nozzle. As soon namely the magnetically operated shut-off valve used in the oil supply system is closed, sinks the line pressure between this valve and the nozzle opening decreases to atmospheric pressure. But mostly it is with one Line pressure below 5 bar no longer possible proper atomization of the falling oil; and when the line pressure is below 2 bar, the nozzle opening sometimes becomes a full stream of oil emitted. The baffle plate and the flame tube are thus filled with oil when the burner is switched off

splashed and the proportion of air bubbles trapped in the pipe system largely determine the amount that flows in Amount of oil. ^

In addition, when the oil to be burned is preheated, this is done to at least 70 ° C is to be heated before the solenoid valve is opened, Io - 15 drops of oil from the atomizer nozzle ejected, as the increase in temperature also results in an increase in volume - the outflowing oil creeps, depending on the burner vibration back on the nozzle block and drips outside the boiler onto the heating floor, or through the Combustion air, individual drops are blown forward against the baffle plate and this is thereby on the Glued back.

Also by heat radiation from the hot walls of a Combustion chamber is the oil in an atomizer nozzle heated and expanded? this also leads to about 20 drops of oil flowing out of the nozzle. The subsequent cooling to room temperature, however, makes this Missing oil volume in the nozzle replaced by sucked in air, but when the burner is put into operation, they interfere escaping air bubbles temporarily stop the atomization. Oil drops of undefined size thus become arbitrary injected onto the turbulator housing and the flame tube, se that uncombustible oil derivatives and soot are detectable in the flue gas.

The object of the invention is therefore to create a pressure atomizer nozzle for heating systems, by means of which with simple Means an uncontrolled leakage of OeI after turning off the burner and also when heating the to

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burning OeIs is reliably prevented and with which is further excluded that during the cooling of the oil in the atomizer nozzle and thus when its volume is reduced, air is sucked in. Rather, it should be achieved that the atomizer is automatically closed and opened depending on the pressure of the oil flow supplied to it, so that contamination and malfunctions caused by dripping oil are reliably prevented.

According to the invention this is achieved in that in

one of the flow channels an automatically switchable i

I shut-off valve is used, which consists of a flow | direction of the OeIs arranged adjustable in two end positions, in one end position resting on a valve surface and a membrane-like spring spring acting on this, supported on a stationary component, "which can be switched depending on the pressure of the supplied oil in the flow channel . m

It is very useful to have the shut-off valve in the |

Area of transition of the oil flow from a central | to arrange axially directed supply channel in outward channels of the atomizer nozzle, so that between the The shut-off valve and the nozzle opening are only a very small amount of oil, but it is also possible if structural Reasons for this require the shut-off valve in an oil feed channel incorporated into an oil preheater assigned to the atomizer nozzle or to be installed elsewhere.

The adjusting body of the shut-off valve can easily be designed as a ball or a cone.

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So that the shut-off valve only opens automatically when the operating pressure is sufficient, and thus a premature one

j leakages% of OeI is prevented, it is appropriate to the

! spring spring acting on the adjustment body on one

j 5 opening pressure of approx. 7-9 bar. And about the To close the pressure atomizer nozzle in good time, the spring should be set to a closing pressure of approx. 1 - 3 bar be designed. This ensures that after the solenoid valve is closed by the still existing low overpressure no oil ejected and that with a Cooling air is sucked in.

So that the spring spring easily closes the open shut-off valve assigned end position can occupy, it is also useful that this on the opposite of the closure body Side supporting component, for example the nozzle cone, with a spring in its end position partially absorbing recess to be provided; Also, the recess should be so that this does not come after is filled for some time by leak oil, with a preferably centrally arranged leading to the nozzle opening Be provided ventilation duct.

To record the changes in volume of the oil warmer in the atomizer nozzle and / or one of these preferably assigned to it with the shut-off valve closed, it is also very advantageous to use an expansion tank to be provided that is to be connected to the flow channels arranged upstream of the shut-off valve. That way will even with extreme heating of the oil in the atomizer nozzle, a pressure increase above a value through which the discharge valve would be opened, reliably excluded,

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In a simple embodiment, the compensating vessel can be an open or in a hose, a bellows or the like, trapped air bubbles are formed, wherein it is appropriate to form the open bubble in the nozzle body, preferably an annular groove-shaped Incorporate chamber, the thread receiving an individual component of the atomizer nozzle and / or into this Integrated recesses with one of the flow channels or the oil collection chamber of the pressure atomizer nozzle connected is.

In the chamber, however, an air-filled container in the form of a hose "- a bellows or Like. Be inserted.

According to a different embodiment, it can be used as a compensation tank also a built into the nozzle body filled with air and closed by a membrane !: Pressure chamber are provided, the membrane of the pressure prevailing in front of the shut-off valve of the to be atomized OeIs is applied.

If a pressure atomizer nozzle for heating systems with an automatically switchable one designed according to the invention Equipped with a shut-off valve, this ensures that no or only one extremely small amount of oil drips from the nozzle opening, even with a pressure increase in the atomizer nozzle this remains closed by heating and that in the case of a volume reduction caused by cooling no air can be drawn in. Namely, the shut-off valve from a closure body and one on this acting membrane-like spring, which revolves depending on the prevailing oil pressure,

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formed, it is ensured that the shut-off valve z. B. at a delivery pressure of 2 bar, and thus before this after switching off the solenoid valve to atmospheric pressure has sunk, is closed. This means that no further spraying is possible, as is dripping is reduced to a very considerable extent, since only nocn diö small ones in the tangential slots and the swirl body the amount of oil present can lead to the formation of drops.

The heating oil in the atomizer nozzle is warmed up and through the heat radiating boiler walls increases its volume, through the molecularly dissolved air and especially through the one after further training provided compensation tank, this expansion is at least compensated so far that the pressure increase in the atomizer nozzle can be kept within limits. By the size of the expediently as an open in an annular groove ^ rtxgen Chamber enclosed air bubble formed equalizing vessel, the pressure increase can be influenced, so

that even with overheating up to 200 opening of the shut-off valve is to be avoided.

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The controlled switching of the shut-off valve offers the further advantage that during a subsequent cooling down no air is sucked into the atomizer nozzle at room temperature. The adjusting body is namely through the force of the spring is pressed against the valve surface, so that the shut-off valve is opened by the low negative pressure cannot be opened. The operating behavior is thus as when the pressure atomizer nozzle is started up again no air bubbles interfering with atomization are expelled, improves.

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In the drawing is an embodiment of the pressure atomizer designed according to the invention, the is explained in detail below.

The pressure atomizer nozzle for a heating system, denoted by 1 in the drawing, consists of a nozzle body 2, by means of an external thread 17 on an oil preheater is attached and has an outlet opening 1o, from which the fuel oil to be burned is expelled under pressure. Between the nozzle body 2 and the oil preheater 3 a filter 4 is inserted, which is screwed into an internal thread 16 worked into the nozzle body 2. Furthermore, in the thread 16 there is one with an oil supply channel 12 provided pressure screw 5 held and the nozzle body 2 takes a spacer sleeve 6 and one Nozzle cone 8 on. In the spacer sleeve 6, which is in the outer area with the help of a seal 7 against the nozzle body 2 is sealed, are also a flow channel 13 and adjoining this outwardly Channels 14 incorporated, via which the oil to be atomized into the Dx'all grooves provided in the nozzle cone 8 is fed. In addition, a further filter 15 is inserted between the spacer sleeve and the nozzle cone 8.

In order to rule out that oil still escapes from the atomizer nozzle 1 after the burner has been switched off, an is automatic switching shut-off valve 21 is provided, which consists of an adjustable in the flow direction of the oil than Ball-shaped closure body 22 and a membrane-like spring spring acting on it 24 exists. The closure body 22 cooperates with a valve surface 23 attached to the spacer sleeve 6, the spring 24 is supported here on the

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Nozzle cone 8. To ensure that the spring 24 always corresponds to the open position of the shut-off valve 2.1 can assume the corresponding end position, I is in the nozzle cone 8 a spring spring partially up-

I 5 taking recess 25 incorporated. And so that the leak oil reaching recess 25 in I can drain away,

I, the nozzle cone 8 has a centrally running ent-

I vent hole 26, which leads to the nozzle opening Io.

1 The shut-off valve 21 is thus immediately before the

I 10 the ice to be atomized enters the outward-facing directed channels 14 arranged.

I The spring 24 is designed in such a way that, for example,

I wise at a pressure of 2 bar in the flow channel

I the closure body 22 rests on the valve surface 23

I 15 and the shut-off valve 21, as shown, gei . is closed. If the pressure increases when the

I burner above a value of, for example, 8 bar,

The spring 24 and the shut-off valve 21 jump over

I is open so that 1o OeI is discharged from the nozzle opening.

I will encounter 2.O.

I, however, as soon as the pressure falls below a value

I 2 bar drops, is due to the force of the spring 24

the shut-off valve 21 closed automatically, a dripping Oil from the oil chamber 11 of the pressure atomizer nozzle 1 is thus reliably prevented.

Even during the inevitable subsequent heating of the oil located in the oil chamber 11 by the jet

I lungs heat of the boiler walls and the resulting

I volume increase is excluded that OeI from the

% 3o pressure atomizer nozzle 1 can drip. The closure body

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is namely through the force of the pre-tensioned spring 24 continues to be pressed against the valve surface 23, the shut-off valve 21 therefore remains as long as the pressure in the Oedraum 11 does not rise above 8 bar, closed. Part of the increase in volume is compensated for by the molecularly dissolved air in the oil.

However, even when heated to z. B. 200 ° C, the pressure in the oil chamber 11 does not rise so that the Shut-off valve 21 would be opened, an equalizing tank 3o is connected to it, also the larger one Changes in volume are to be compensated. To do this an annular groove-like chamber 31 is incorporated into the nozzle body 2, in which, as in the upper Part is shown by a dash-dotted line, an air bubble 32 forms. The one enclosed in the chamber 31 Air is more or less compressed when the pressure increases in the oil chamber 11, so that the in this located OeI can expand. The pressure prevailing in the oil space 11 is here via the thread 16 and / or a cut-out 34 that is worked into the end face of the pressure screw 5 and shown in dash-dotted lines transferred to the OeI partially located in the chamber 31. Instead of the open bladder 32, each forms in the upper region of the chamber 31, but can also, as is also shown in dash-dotted lines, in this is, an air-filled hose 33 can be inserted, which is compressed when the pressure increases.

The shut-off valve 21 accordingly switches automatically as a function of the pressure prevailing in the oil chamber 11 around. In this way it is ensured / that after

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Closing the associated solenoid valve OeI from the Atomizer nozzle 1 neither due to the residual pressure still present nor due to the increase in volume escapes and that even with a cooling no air can be sucked into the pressure atomizer nozzle 1.

February 28, Tp83 e-1 A 82o3

Claims (1)

DiPL.-ING. GUIDO ENGELKARDT PATENT ADVERTISER 7990 Friedrichstefen Satronic AG CH - 81o5 Regensdorf Pa L e it-1, claims 1. Pressure atomizer nozzle for heating systems, with a one-part or multi-part nozzle body to which the oil to be atomized is via in this or associated intermediate pieces incorporated flow channels are fed in and emerge as oil mist from a nozzle opening, characterized, that in one of the flow channels (12, 13) an automatic switchable shut-off valve (21) is used, which consists of one in the direction of flow of the oil in two end positions adjustably arranged closure body (22) resting against a valve surface (23) in one end position and a membrane-like design which acts on this and is supported on a stationary component (8) Spring spring (24) is made, each depending on the pressure in the flow channel (13) of the supplied OeIs is switchable. It ti · · * * r ψ »* ■ * ■ r * · 2. Druckzerstäoberdüse according to claim 1, because dji rch marked, that the shut-off valve (21) in the area of the transition of the oil flow from a central, axially directed feed channel 12) into outwardly directed channels (14) of the atomizer nozzle (1) is arranged. 3. Pressure atomizer nozzle according to claim 1, characterized / that the shut-off valve (21) in an oil preheater (3) incorporated in an oil preheater (3) assigned to the atomizer nozzle (1) or is arranged elsewhere. 4. Pressure atomizer nozzle according to one or more of claims 1 to 3, characterized, that the adjusting body (22) of the shut-off valve (21) is designed as a ball or cone. 5. Pressure atomizer nozzle according to one or more of claims 1 to 4 , characterized, that the spring (24) acting on the adjusting body (22) of the shut-off valve (21) is designed for an opening pressure of approx. 7 to 9 bar and a closing pressure of approx. 1 to 3 bar. <5 «·> 'I I C t ■ «t f 't • "ι a <ι ι * · ι" it cc ■ /. ¹ I. 6. Pressure atomizer nozzle according to one or more 1 of claims 1 to 5, I characterized by | ^f that the spring (24) on the closure \ body (22) opposite side supporting j Component (nozzle cone 8) with one of these in their j I a recess partially accommodating an end position (25) | is provided. § 7. Pressure atomizer nozzle according to claim 6, I characterized in that f that the recess (25) with a preferably § centrally arranged in the nozzle cone (8) incorporated -and to the nozzle opening "(1o) leading ventilation channel (25) is provided. 8. Pressure atomizer nozzle after one or more
of claims 1 to 7, characterized, that to accommodate the volume changes in the Atomizer nozzle (1) and / or one of these preferably
associated oil preheater (3) closed shut-off valve (21) an expansion tank
(3o) is provided, which is connected to the front of the shut-off valve
(21) arranged flow channels (12, 13) connected is. F Ϊ 9. Pressure atomizer nozzle according to claim 8, characterized, that the compensation vessel (3o) is enclosed by an open or in a hose (33), a bellows or the like Air bubble (32) is formed. 10. Pressure atomizer nozzle according to claim 9, characterized thereby, that to form the air bubble (32) in the nozzle body (2) a preferably annular groove-shaped chamber (31) is incorporated, the screw thread receiving a single component (4, 5) of the atomizer nozzle (1) (16) and / or recesses (34) incorporated into these with one of the flow channels (I2) or connected to the oil collection chamber (11) of the atomizer nozzle (1) is. 11. Pressure atomizer nozzle according to claim 1o, characterized in that that in the chamber (31) an air-filled container In the form of a hose (33), an inflated bellows or the like. Is inserted. 12. Pressure atomizer nozzle according to claim 8, characterized, that the expansion tank by a worked into the nozzle body (2), filled with air and ι- ν. is formed by a membrane closed pressure chamber, which prevails in front of the shut-off valve (21) Pressure of the oil to be atomized is applied. February 25, 1983 e-1
A 82o3 /