DE8609585U1 - Device for generating a combustible mixture of butane or propane gas and air - Google Patents

Description

Colsman & Co., Brauck 1, 5890 Werdohl 4 20

Device for generating a combustible mixture of butane or propane gas and air.

25th

The object of the innovation is a device zua.

Generation of a combustible mixture of butane or propane gas and air at the end of a gas supply pipe arranged nozzle and an inlet funnel axially arranged at a distance in front of the nozzle, to which a mixing tube is connected, which is followed by a conically widening diffuser.

Such devices are fundamental in their structure known and are used, for example, in burners for infrared emitters.

In these devices, the supplied gas, the unto.T stands a higher pressure than the ambient air and exits the nozzle at high speed,

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in the mixing tube with the flowing through the inlet funnel Air mixed. A problem with such devices is that as much as possible A constant mixing ratio of gas and air can be achieved over a larger volume range target. When using the device in burners for

IG infrared emitter, which is especially used in animal rearing are to be used, there is also the fact that certain levels of carbon monoxide in the exhaust gas are not exceeded may be. In known devices, this is only over a relatively small control range of the supplied Gas quantity of about 1: 2 possible.

The object on which the innovation is based was to develop a device of the type described at the outset To be designed in such a way that the following conditions are met over the largest possible control range:

a) The amount of air required for combustion should be sucked in by the gas jet emerging from the nozzle will;

f 25 b) the amount of air drawn in should be mixed with the gas in such a way that the C0 value in the exhaust gas that corresponds to the prescribed standard values is not exceeded;

c) the combustible gas-air mixture should be brought to a higher pressure than the ambient pressure.

This object is achieved according to the innovation in that the ratio of the mean inner diameter of the mixing tube to the diameter of the nozzle is in the range from 35: 1 to 25: 1.

The mixing tube can either have a cylindrical inner cross-section, but it can also have a

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have a conically widening cross-section with an opening angle of up to 5 °.

According to the further innovation, it has proven to be advantageous if the ratio of the length of the mixing tube to the inside diameter or the mean inside diameter of the thinronre is in the range from 3.5: 1 to 4.5: 1. Of the the diffuser adjoining the mixing tube can advantageously have an opening angle of approximately 14 °.

In the following, with reference to the accompanying drawings, an exemplary embodiment of a device according to FIG Innovation described in more detail.

In the drawing is a schematic representation in Longitudinal section of a device for generating a combustible mixture of butane or propane gas and air shown. At the front end of a gas supply pipe 1, which can be preceded by a control device not specifically shown, is an outlet nozzle 2, which has an inlet

funnel 3 opposite. To the inlet funnel 3!

is followed by a mixing tube 4, which in the embodiment | game is shown as a mixing tube with a cylindrical cross-section. The mixing tube 4 can also be one have a slightly widening cross-section, whereby an opening angle of 5 ° should not be exceeded.

A conically widening diffuser 5 adjoins the mixing tube, at the outer end of which a flame holder 6 is arranged.
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The ratio of the length L of the mixing tube 4 to its inner diameter D - in the case of a conically widening Mixing tube is D the mean inside diameter - is

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3.5: 1 or greater. The ratio of the inner diameter D of the mixing pipe 4 to the diameter of the nozzle 2 is in the range of 35: 1 to 25 I _4!

The opening angle oC of the diffuser 5 is about 14 ° *

The functioning of the device shown is as follows:

/ \ From the nozzle 2 flows through the driving gas at high speed in the form of a gradually widening beam. The core of this gas jet has a significantly higher speed than the edge areas. The gas jet enters the mixing tube 4. Here air particles are accelerated and carried away via the exchange of momentum. Air flows in through the inlet funnel 3.

In the mixing tube 4 there is a strong turbulence due to the large velocity gradient between air and gas generated, which in the course of the flow through the mixing tube 4 causes a good mixing of gas and air. Of the

!, 'adjoining diffuser 5 sets the in mixing tube 4 in front

existing speed energy is converted into pressure, whereby at the same time the speed is reduced to the extent that that behind the mold holder 6 a steadily burning

Can hold (I% ÜR de flame.

With the above-described device according to the Neuuwg it is possible to meet the required limit values for carbon monoxide in the exhaust gas when used in a burner must be adhered to over a wide control range of the gas supply of about i; iiO.

Claims (5)

ii ta * ι · f λ ι * ■ · * · t · · t rtfra ■ · «ι * · ι ι ι ι ι · · · te · r% · iii · · · · it 11 * i ■> · ' * 86-20-> 29-5 - claims for protection 1. Device for generating a combustible mixture of butane or propane gas and air with a nozzle arranged at the end of a gas supply pipe and an inlet funnel arranged axially at a distance in front of the nozzle, to which a mixing tube is connected, which is followed by a conically widening diffuser , ⁴ ^ a characterized in that the ratio of the mean inside diameter (D) of the mixing tube (4) to the diameter of the nozzle (2) is in the range from 35: 1 to 25: 1. 2. Apparatus according to claim 1, characterized in that the mixing tube (4) has a cylindrical inner cross section having. 3. Apparatus according to claim 1, characterized in that the mixing tube (4) has a conically widening Has internal cross-section with an opening angle of up to 5 °. 4. Apparatus according to claim 2 or 3, characterized in that that the ratio of the length (L) of the mixing tube (4) to the inner diameter (D) or mean inner diameter of the mixing tube (4) is in the range from 3.5: 1 to 4.5: 1. 5. Device according to one of claims 1 to 4, characterized in that the opening angle (^) of the diffuser (5) is approximately 14 °.
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