DE8220335U1 - Burner for generating a stream of hot gas, especially for shrinking plastic film - Google Patents

Description

MSK packaging systems limited company Liability, Kemnadestrasse 3, 4192 Kalkar-Wissel

Firing to generate a stream of hot gas, especially for shrinking plastic film

The invention relates to a burner for generating a stream of hot gas, in particular for shrinking of plastic film, with a pressure distribution chamber connected to a mixture feed with a fan-shaped plan, which at their broad end.in a combustion chamber with an elongated cross-section merges, with in the transition area A flame holder is arranged between the pressure distribution chamber and the combustion chamber.

Such burners are required for shrinking plastic films, e.g. in the form of Hoods that are drawn onto a stack of goods located on a pallet. The shrinking can be done with handheld devices, but also with stationary, automatically operating systems be made. When shrinking plastic film, it is important that a uniform flame-free hot gas flow is generated. In particular—

Deutsche Bank AG Krefeld 103/1525 BLZ32 (570080. '■ Sp'ai <a ^ e KrpfelupO97 ^ 2 BLZ 32050000 · Postal check Essen 4055-431 BLZ36010043

• · · ■

PATENT ADVERTISER DR. STARK · MOpRfEFiSTFJ. 1 <g) J D-415IJ KfJEF.BLD · "§? (02151) 28222 U. 20469 · [Tx] 853578

111 t

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In the case of handheld devices, the aim is for the burner exhaust gases to exit as broadly as possible. Because of this the combustion chamber and its outlet receive an elongated cross-section. 5

A burner of the type described above is known (German patent application P 32 15 608.S). In this burner the flame holder is made up of a large number of rods formed, which are arranged parallel to each other and extend over the height of the rectangular Extend cross-section at the beginning of the combustion chamber. Since such a flame holder is a forms considerable flow resistance, it also causes a distribution of the

f the pressure distribution flowing into the combustion chamber

Gases. This assumes, however, that the individual rods of the flame holder with relatively are positioned at an exact distance from one another. However, such a precise arrangement is Difficult to achieve in terms of production technology.

^: Even with minor deviations it happens

to a change in the pressure distribution in the combustion chamber and thus to irregularities of the outflowing hot gas stream.

The object of the invention is to improve a burner of the type described above so that that it has reliable and consistent properties with a simple structure.

This object is achieved in that the flame holder is a profile rod, which

PATENT ADVOCATE DR. STARK · MCjERSEF? STFJ. 1 ^ 0 > D-415.J KIJEF ₁ PLD · ⁰ ^ (02151) 28222 and 20469 · Qx] 853578

|: across the entire width of the pruck distribution

chamber or combustion chamber extends and with

the adjacent walls forms passage gaps for the fuel gases.
5

With this burner, the flame holder is only a single component, which is also technically possible in terms of production can be positioned very precisely with simple means. Even when producing larger quantities, they can be reliable and achieve consistent properties of the burner. The rod-like flame holder divides, as it were, the gas flow entering the combustion chamber. The one through the passage gap partial flows entering the combustion chamber

are under the effect of the

, stab-formed dead water in the middle of the

Combustion chamber pulled and strain at their

.; Combustion therefore the walls of the combustion chamber

\ 20 less.

'Particularly favorable conditions arise

when the flame holder is a pipe which has a pronounced dead water area downstream that not only produces the desired one

Guiding the partial flows to the middle of the combustion chamber

.; causes, but also an intense entanglement

generation of the combustion gases. This is especially true if the passage gaps have the same dimensions own.

A preferred embodiment of the invention is characterized in that the substantially

PATENT ADVOCATE OR. STARK ■ MQeR ₁ SEFESTf ^. TjO { D-415f KJJEF.ELD ■ «g» (02151) 28222 and 20469 - Qx] 85357'f>

flat walls of the pressure distribution chamber and combustion chamber in the transition area with a Connect bends to each other and that the pipe is arranged symmetrically to the bend. then namely arise between the outer sides

of the pipe and the adjacent walls ^

Passage gap with a venturi-like cross-section. Ij

To ensure complete combustion of the fuel gases To enable the combustion chamber to exit before it exits the combustion chamber, the length of the combustion chamber - viewed in the direction of flow of the combustion gases - should be at least three times the (over the length) constant height of the combustion chamber.

15th

In order to improve the pressure distribution across the width of the combustion chamber, the pressure distribution chamber additionally have internals for the control and distribution of the fuel gases.

These internals should in particular be designed and arranged so that across the width of the The same pressure conditions prevail in the combustion chamber and the same amounts of fuel gas in each case Enter combustion chamber.

25th

The internals can in particular be formed from a sheet metal, which is essentially extends across the pressure distribution chamber and with the walls of the pressure distribution chamber Forms penetration gap. In addition, the sheet can also be perforated.

In the following, an embodiment of the invention shown in the drawing is illustrated explained; show it:

I I t t I · I t I t I I

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PATENT ADVOCATE DR. STARK - MdERkERl STF *. 14O ί D-415 & K $ EF, gLD - <g> (02151) 28222 & 20469 * Qx] 853578

Fig. 1 is a plan view of a burner,

Fig. 2 is a section in the direction II-II

the object according to FIGS. 1, 5

Fig. 3 is a view with partial section in the direction

III-III according to Fig. 1.

The burner shown in the drawing serves to generate a hot gas stream from combustion gases. It is used at Shrinking of plastic film, e.g. of shrink hoods, that have been pulled onto a stack of pallets.

15th

The basic structure of the burner consists of a mixture feed pipe 2, which is followed by a pressure distribution chamber 3 with a fan-shaped plan (Fig. 1).

The pressure distribution chamber 3 merges into a combustion chamber 4 with an outlet 5. In the transition area between pressure distribution chamber 3 and Combustion chamber 4 has the pressure distribution chamber 3 and also the combustion chamber 4 has a elongated rectangular cross-section on which the side walls 6,7 of the pressure distribution chamber 3 converge. These side walls 6, 7 of the pressure distribution chamber go into adjoining side walls with a bend 8 9.10 of the combustion chamber 4 over. The combustion chamber 4 has a length that is at least three times their height. For example

the length of the combustion chamber is at least f

45 mm and their height 15 mm. The width of the

PATENT ADVOCATE DR. STARK - MOERSEFi STFf. 1-40 i D-415 {> KIjEF ₁ ELD - <g> (02151) 28222 U. 20469 - Qi] 853578

Combustion chamber and thus also the width of the pressure distribution chamber in the transition area (Bend 8) is 180 mm in the exemplary embodiment.

In the transition area between pressure distribution chamber 3 and combustion chamber 4 is used as a flame holder arranged over the entire width extending tube 11, which, as shown, is attached symmetrically to the bend 8 and which with the adjacent side walls 6.7 or 9.10 passage gaps 12.13 of constant width for the fuel gases.

To improve the pressure distribution of the combustion gases when entering the combustion chamber 4 has the pressure distribution chamber 3 internals, which in the illustrated embodiment a Sheet metal 14 are formed, which extends substantially across the pressure distribution chamber extends and with the side walls 6,7 of the pressure distribution chamber 3 passage gaps or 16 forms. The sheet 15 is folded in the middle so that two at an angle of in the embodiment 117 ° to each other directed legs arise, which in the area of their common folding edge 17 attached to the side walls 6, 7 of the pressure distribution chamber 3 are. The legs extend, as shown, in the direction of the combustion chamber and ensure that the fuel gases flowing out of the mixture feed pipe are distributed in such a way that that they enter the combustion chamber 4 at the same pressure and the same amount. Not shown is that the plate 14 can also be perforated.

PATENT ADVOCATE DR. STARK-MCER ^ EFJSTfJ. 140 j 'd-4153'kREFBLD * g> (02151) 28222 & 20469 - Qx] 853578

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p In Figs. 1 and 2 it is also shown

that on the side wall 10 of the combustion chamber 4, a nozzle 18 with an internal thread 19 is attached can be.

In addition, the long side walls 9, 10 of the combustion chamber 4 have cover folds (20) that extend in the direction of the outflowing gases. This cover folds 20 can also of angled and interconnected

welded ends of adjacent wall sections be formed. This keeps the burner geometry unchanged even under strong thermal loads.

Claims (10)

Dr.-lng. WALT £ # R * "S TA R K PATE NTANWALT Moerser Straße 140 D-4150 Krefeld 1 ° S (02151) 28222 and 20469 El 8 53 Claims: 1. Burner for generating a stream of hot gas, in particular for shrinking plastic film, with a pressure distribution chamber connected to a mixture feed fan-shaped plan, which at its broad The end merges into a combustion chamber with an elongated cross-section, in the transition area A flame holder is arranged between the pressure distribution chamber and the combustion chamber, characterized in that the flame holder (11) is a profile bar that extends over the entire width of the pressure distribution chamber (3) or combustion chamber (4) extends and with the adjacent walls (6, 7 and 9, 10) passage gaps (12, 13) for forms the fuel gases. 2. Burner according to claim 1, characterized in that the flame holder is a tube (11). 3. Burner according to claim 1 or 2, characterized in that the passage gaps (12,13) have the same dimensions. Deutsche Bank AG Krefeld 103/1525 BLZ33o'70080. "· Sparkasse« Trefelci 30572? BLZ 32050000 · Postal check Essen 4055-431 BLZ36010043 11 1111 PATENT AGENT DR. STARK - MCpRfERJ STR. Ίφ i D-4i5J * K? EFaLD ■ "g» (02151) 28222 and 20469 - Q3 853578 4. Burner according to one of claims 1 to 3, characterized in that the substantially flat walls (6,7 or 9,10) of the pressure distribution chamber (3) and combustion chamber (4) connect to each other in the transition area with a kink (P) and that the pipe (11) is symmetrical to the kink (8) is arranged. 5. Burner according to one of claims 1 to 4, characterized in that the length of the Combustion chamber (4) - viewed in the direction of flow of the combustion gases - at least three times the constant (over the length) Height of the combustion chamber (4) is. 6. Burner according to one of claims 1 to 5, characterized in that the pressure distribution chamber (3) has internals (14) for directing and distributing the fuel gases. 7. Burner according to claim 6, characterized in that the internals of a sheet metal (14) are formed, which is essentially across the pressure distribution chamber (3) extends and with the walls (6,7) of the pressure distribution chamber (3) passage gap (15,16) forms. 8. Burner according to claim 7, characterized in that the plate (14) is perforated. • · PATENT ADVOCATE DR. STARK · MOEFfeEFt STÖ. lio I D-415b K & EEELD · ^ (02151) 28222 and 20469 ■ [Tx] 853578 9. Burner according to one of claims 1 to 8, characterized in that the long Side walls (9, 10) of the combustion chamber 4 (4) have cover folds (20) f extend in the direction of flow of the gases. ι ? ■ 10. Burner according to claim 9, characterized marked- I net that the cover folds (20) from I angled and welded together I 8 ends of adjacent wall sections formed are .