DE2315231C2 - Device for burning heating gases - Google Patents

Description

a) the second line (61) opens into the housing (11) at a downstream point as seen in the flow direction of the heating gas emerging from the nozzles (24), so that no substantial deflection of the heating gas flowing out of the nozzles (24) takes place;

b) the housing interior (66) has air guiding arrangements assigned to the mixing tubes (26) (33,48,84) so that at the inlet opening area (27) there is essentially the same air pressure and ambient air in one of the Outlet opening area (31,56) of each mixing tube (26) respectively surrounding socket (44,46,49, 33,79,84) is passed directly to the combustion chamber;

c) on the outlet-side section (31) of each mixing tube (26; a dome-shaped upstream arched sieve 58) is arranged on the inside, at the level of the Sieves (58) are radial bores (S3) in the Wall of the mixing tube (26) ΐ. Outside and on this section (31) of each mixing tube (26) an upstream closed ring jacket (54) is placed, which communicates via the radial bores (53) with the interior of the associated mixing tube (26) forms a narrow annular gap (56) and extends directly into the combustion chamber

2. Apparatus according to claim 1, characterized in that the first line (19) is a low-pressure heating gas line

3. Apparatus according to claim 1, characterized in that the second line (61) to the housing (U) directly flanged an outlet port Kleingebiäses (62,78) is

4. Apparatus according to claim 3, characterized in that the small bubble (62, 78) on an opening (59) in the top (14) of the housing (11) is flanged

5. Apparatus according to claim 4, characterized in that the opening (59) is approximately opposite half the length of the aligned mixing tubes (26).

6. Apparatus according to claim 1, characterized in that the direct distance between adjacent mixing tubes (26) is small, preferably smaller than half the mixing tube diameter

The invention relates to a device for burning heating gases according to the preamble of Claim 1.

Heating gas is understood to mean generator gas, natural gas, etc., while the word "gas" is to be understood in its most general meaning, including ambient air

A generic device is known from FR-PS 14 37 575, for example. Here the second line coming from the fan opens upstream from the nozzles into the housing. Although S "U a an air distribution grille still in front of the nozzles

to cause an even supply of air to the mixing tubes, but it must be from the nozzles into the mixing tubes The flowing heating gas jet draws the required air from the outside blowing in the same direction over the nozzles Suck in air flow. This according to the Venturi principle taking place suction process is therefore because of the small difference in the relative speed of Heating gas jet and air flow not very effective. In addition, the air flow flowing along the nozzles, the thus has a certain kinetic energy through which Heating gas jet deflected from its direction of movement and this within the cm distance. So there is only insufficient air in the mixing tubes. before especially when the heating gas is supplied at low pressure, which is generated in the area of the ten air pressure moves, no satisfactory Venturi effect can arise. For this reason alone is the known device limited to a relatively high heating gas pressure range is also located on Outlet of the mixing tubes a baffle that the Gas mixture jet deflected twice by 180 ° and then the output of all mixing tubes is combined into a single mixed jet, which only then enters the combustion chamber exits This deflection opposes the beam considerable resistance and can only pass through accordingly high fan pressure and even higher heating gas pressure can be compensated. On the other hand, see !! a reasonably usable flame zone due to the deflection can be achieved. Because of the high gas pressure required, the correspondingly high flow speeds and the ring-shaped or strip-shaped combined flame zone, the flame is uneven, extends far into the combustion chamber and causes strong flame noises. Because of the Fluctuations in the flame area can be seen in itself simple and reliable ionization control is not insert. Furthermore, the required fan power is high with a corresponding noise level, large Size and high power consumption. For example in the article »Construction and operation of some gas burners for Industrial use "from the magazine" gaswärme international ", Volume 21, No. 12, December 1972, from page 548. are explanations about gas burners in general, after which one can find those with partial, complete or without gas-air premix benen gas burners with fan are in any case without Premixing formed and thus the generic feature of a mixing tube is missing. The real one Mixing takes place in the flame and such burners require sufficient turbulence len, a relatively high air pressure of 300 mm WS or 30 mbar. Here too the flame is restless and loud and so is the fan. big, loud and draws a lot of electricity.

With so-called atmosphere burners, that is, the combustion air without a fan directly from the area it is known to be downstream of the nozzle to arrange a mixing tube so that the gas jet sucks in air from the environment according to the Venturi principle For example, DE-OS 20 34 284 and US-PS

3694137 show such burners. In this respect, it is similar Nozzle-mixing tube arrangement of that of FR-PS 14 37 575, but it is missing for higher burner capacities The necessary air supply with overpressure and the difficulties associated therewith are therefore such The atmosphere is alien.

The object of the invention is to create a generic device which, with a smaller, low-performance! and quieter fan and a quiet, also largely noise-reduced Flame generated so that ionization control is also possible

This object is achieved by the characterizing features of claim 1

a mixing tube 26 is provided, whose according to FIG. 1 Left end section 27 opens like a trumpet. This is followed by a circular cylindrical section 28 at. This is followed by a frustoconical widening section 29 and finally a shorter one again Kreiszylmdrischer section 31. A screw 32 is screwed into the bottom 12 from the bottom left holds an air baffle 33 which extends continuously from the side wall 16 to the side wall 17 ίο runs within the housing 11 resting on the floor 12 to about the right quarter, makes there a first bend 34 upwards, here runs at an angle of about 30 ° upwards and then turns a bend 36 with a section 37 in the horizontal

The special introduction of the air downstream from 15 right back. Furthermore, the screw 32 traverses a the nozzles results in a high speed of rotation Heating gas and air, even if both only pass through tenwand 17, slowly with his horizontal vision stream. So there is a lot of air in the mixing tube 39 rests on the air baffle 33 and in its re sucked, so that a well-burning mixture is created vertical legs 41 in the top about half-one further mixing by baffles or around 20 circular recesses has Die.-1 recesses Steering of the beam is not necessary, so that also fit straight into a circumferential groove 42 of a sleeve 43, which for this reason, a low pressure both <ies heating over the seam of the end section 27 and the exhaust gas as well as the air is sufficient The special air cut 28 sits and is soldered there above the Guide around the mixing tubes in connection with the section 29 is on the cover 14 a bracket 44 air-ring jackets at the burner end there is a 25 tightly attached which extends from the side wall 16 to the side stable and calm holding flame. Each mixing tube acts wall 17 extends at its vertical leg as it were as a burner, so that the flame is actually attached to another bracket 46 which is also attached consists of several individual flames extends from side wall 16 to side wall 17 as loading

Further advantageous refinements result from fastening elements using screws $ 1. The horizontal from the description below and from the wrong legs of the bracket 46 carries an air guide claims. sheet 48, which is approximately the right half of the mixing tube 26

The invention is described below with reference to the preferred embodiment area 49 shown in the drawing covering the greater part of its length in the drawing and described in more detail to the left of it until it is played. It shows: Section 28 with one leg 51 bent at about 90 °. 1 is a vertical, partially broken away 35 gene and to the right of area 49 after a very cross-section through sir. first example! Lt. obtuse angled bend 52 on the mixing tube from a scale of 1: 1. In the section 31 of the mixing tube 26, reference is expressly made to this figure, wall small radial bores 53 are provided. Au? the F i g. 2 shows a view according to arrow A in FIG. 1 on section 31 is a circular ring jacket 54, a complete device with six horizontally pushed on, so that an annular gap 56 of a few millimeters in width is created to the left of the radial boreholes.

The ring jacket 54 is located at 53 gsn with a constriction 57 airtight. The right end of the Ringmanu-Is 54 protrudes a few millimeters beyond the right end of section 45 31. From inside the section 31 is a spherical cap-shaped Sieve 58 inserted arched inward. A recess 59 is provided in the cover 14, into which Airtight as a second line 61 a nozzle of a small fan 62 protrudes at the top and bottom of the housing attached rear wall 13, an airtight fastened 50 11 fastening flanges 63 welded, with which th cover 14 and two equally attached side walls you can attach the unit in front of a combustion chamber.

F i g. 3 shows a view according to arrow B in FIG. 2, partially broken,

F i g. 4 shows a view according to FIG. 2, but with two layers of mixing tubes arranged one above the other, F i g. 5 shows a view according to the arrow Cin F i g. 4,

F i g. 6 shows the front view of a structural unit with six mixing tubes arranged on a radius.

A housing 11 has a bottom 12, one airtight

16 and 17. At the rear of the rear wall 13 is a heating gas box 18 welded on one side over a first Line 19 receives heating gas without the intentional admixture of air. From the rear there are threaded sockets 21 with internal threads Inserted gas-tight In these screw plugs 22 are screwed gas-tight coaxially with the Locking screw 22, a further threaded bushing 23 with an internal thread is provided, which both the heating gas box 18 and the rear wall 13 traversed gas-tight. In the threaded bushing 23 is a nozzle 24 with External thread screwed in If you unscrew the screw plug 22 you can go through the Hole in the threaded bushing 21 to the nozzle 24,

The cover 14 protrudes less to the right than the B or 1 ?, which is compensated for in the side walls 16, 17 by a step 64. As a support element for the Mixing tube 26 is used for the bracket 38 and the air baffle 33. As can be seen from FIG. 2, there are six of these Mixing tubes 26 arranged side by side The device works as follows:

Line 19 has been carrying low-pressure heating gas since then

lent pressure. Pressure reducing valves or overpressure generators are not beyond what has been used up to now necessary. The heating gas box 18 has such a volume that seen in the transverse direction essentially a.i the same gas pressure prevails in all places, so that not

because the hole in dtr threaded bush 21 is larger than ts about the DTR close line 19 located nozzles 24, the outer diameter of the nozzle 24. It would otherwise be obtained without a higher pressure than the other. The heating gas coming to the nozzles 24, which is otherwise not possible to control the nozzle 24, is cleaned or exchanged in the mixing pipe. Injected coaxially with the nozzle 24 re 26 In the space 66 there is an overpressure of air

of about 5 mm water column. This causes vom Space 66 is pressed from air into the end section 27. This is one part of the air The other part of the air can because of the parts 44,46,48,33 not directly to the right stream. The air baffle 48 already forces the air s about half the length of the mixing tube 26 horizontally and to flow almost laminar to the right. This air enters the X-shaped spaces 67 to the right the end. Because the two outer mixing tubes 26 end at a small distance from the side walls 16, 17, have Ben the gaps there half an X-shaped figure.

These two half Xs correspond to a whole X and the spaces 67 are equal to one another, both in area and geometry. Each mixing tube 26 therefore has the same air flow conditions. The sieve 58 backs up the air-heating gas mixture in the mixing tube 26 somewhat, the more the further the flow volumes in the section 31 are on the outside. This is due to the fact that with the same mesh size of the screen 58 in Seen in the direction of flow, the wires are always closer together towards the outside. This jam causes the radial bores 53 to be supplied with an air-heating gas mixture, which is relatively independent of pressure emerges at the front in the annular gap 56 and thus leads to a good holding flame. The second line 61 could be at Another arrangement of the sheets contributing to the air flow also blow into the housing U from below. How one sees, prevent the air baffle 48 and the mixing tubes 26 that the air can get directly to its destination. Rather, these parts represent There is resistance to flow and the air can calm down until it reaches its destination if the air is blown in from the rear wall 13, then one would have to prevent it from reaching the end sections 27 directly. The resulting flame is hygienic, dehumidified and silent. She also bothers in not close to living spaces. It is also short, which is why shorter combustion chambers are required with the same heating output. Figs. 2 and 3 show the two Ignition electrodes 68 and 69 near the right mixing tube. These ignition electrodes are also part of the ionization monitoring (not shown), which works so satisfactorily here because the Flame is calm and has hardly any pulsations. In the fig. 2 and 3 you can also see the housing for the Small blower runner. In Fig. 3 the inlet opening 72 is visible, while in FIG. 2 the electric motor 73 can be seen This has a power consumption of around 20 watts. This brings you to eight mixing tubes 8000 kcal each on the safe side, because the optimal one Combustion takes place when the throttle valve, which can be operated via a lever 74, is closed somewhat The unit also includes a low air pressure switch 76 and a low gas pressure switch 77. As of Comparison of the size of this known ironer switch 76, 77 with the small fan 62 shows that the dimensions can be minimized here is F i g. 4 and 5 show that double the number of mixing tubes hardly leads to an increase in the dimensions A small fan 62 is used here, as already described, and an additional small fan 78, whose engine looks to the other side, so that a "left" and a "right" small fan are used, which relate to the left and right six Blow in the sergnip of the mixing pipes symmetrically. For better air flow and also for reasons of mounting a horizontal sheet metal strip 79 is provided here between the upper and lower group of six, which extends from side wall to side wall and is about as wide as the ring jacket 54 is long instead of the Bracket 38 you have a higher bracket 81 here, which both the upper and the lower row the mixing tubes on their sleeves 43 carries and in its area an air movement in the horizontal direction in essential connectors. In the device according to FIG. 6 are six mixing tubes on the same radius For their storage, a tube 82 is provided which is soldered to the rear wall 13, of course the nozzles 24 are also arranged here on a circle corresponding to the center of the mixing tube Sockets 43 carries the pipe 82 a star which engages in the circumferential grooves 42 The annular jackets 54 are on Pipe 82 welded on. Here, too, the air is blown onto section 28 of mixing pipes 26. In the area of the ring jackets 54, the mixing tubes 26 are on the outside Surrounded by a guide cylinder 84, however, otherwise protrude freely into the space 66. All the others are therefore missing Air baffles such as the air baffles 48,33 etc. of the previously described embodiments.

For this purpose 4 sheets of drawings

Claims (1)

Patent claims: 1. Device for burning heating gases, with a plurality of mixing tubes arranged in a housing, one end of which is each to one approximately coaxial nozzle arranged at a cm distance is open, with a first line supplying heating gas to the nozzles, as well as with ambient air a second line leading into the housing from a fan, the housing being essentially airtight, but open to the combustion chamber, characterized by the following features: