Device for detecting the presence and the quality of a flame by detection of electromagnetic radiations.

p0001The present invention relates to a device for detecting the presence and the quality of a flame with<ul><li>1. a collection and bundling element (11) for the electromagnetic radiations of the flame, comprising a lens system and a corresponding holder,</li><li>2. a transfer and separating element (12) for the radiation, from a radiation Bestend input point (121), a fiber optic bundle (122) and an output and separating station (123),</li><li>3. an integrated element with the just mentioned element for sealing the combustion chamber with respect to the electrical circuit of the device, consisting of the same cured with liquid binder starting and poured separation point (123)</li><li>4. a container in a metallic element (14) contained for the measurement and evaluation of the detected radiation (13) consisting of corresponding sensors and electronic circuits.</li></ul>

p0002Depending on the formation conditions and the space of the combustion chamber, it may be necessary to locate the sensing element (11) in the immediate vicinity of the flame inside the combustion chamber (Fig. 1-A).

p0003In such a case, the transmission and separating element has a corresponding length (<u>Means in an extended version</u>) And contains all the above ingredients.

p0004In other cases (Fig. 1-B), the sensing element (11) of the flame be remote and accordingly, the transfer and separating element have a minimum length (<u>Means in summary execution</u>) And all of the above constituents, such as 12, are combined in the source and separating point (123).

p0005In the device in an extended embodiment, the sensing element is attached to the body of the burner and the typical means diagram is reproduced in Figure 1-A.; in 11 denotes the detecting member 12, the transmission element, which consists of the input point 121, the separation point 123 and the intervening beam 122, which is provided with a flexible jacket 15, and leads to a container 14, in which the sensors and the corresponding amplifier circuits are contained thirteenth

p0006The device is a summary version is mounted directly on the wall of the combustion chamber and the typical device diagram is reproduced in Figure 1-B, where the collection and bundling member 11 seen is located in the immediate vicinity of the source and separation point 123, which also find the tasks the point of entry and the transmission element takes over.

p0007The invention is based on the following tasks:<ul><li>Detecting emitted by the flame of a burner radiations by means of an arranged in the vicinity of the flame optical element, at operating temperatures of about 300 ° C and at a peak temperature of 450 ° C; </li><li>Remote transmission of radiation via a fiber bundle, so that transmission of electromagnetic radiation is achieved with optimum efficiency as a function of the desired wavelength;</li><li>Separation of radiations of different wavelengths by a combination of different fibers and / or optical filters and / or sensors, which are designed for different wavelength ranges;</li><li>Receiving the radiation of different wavelengths to analyze separately at separate sensors, which are capable of the energy radiation of the flame in the different areas of the wavelength and the modulation;</li><li>comparative analysis of the radiations with different wavelengths and different modulation frequencies, to detect the presence and the quality of the flame, and the possible deviation from the optimal quality.</li></ul>

p0008To fulfill the above tasks, the input device according to the invention mentioned below characterizing features:<ul><li>the sensing element consists essentially in a converging lens which focuses the serving for the evaluation of combustion Nutzstrahlungen in the region of "geometric" focal point; in this focus, the input header of the transmission and separating element forming the optical fiber bundle is placed and fixed;</li><li>the transfer and separation element is formed by optical fibers whose radiation yields are adapted to the certain wavelengths for evaluation, and these optical fibers are separated in a separator at the outlet end;</li><li>the separation element comprises means for the mechanical fixation of the fibers for their routing to the radiation-sensitive sensors, and for the sealed separation of the combustion chamber of the electrical circuit of the device.</li></ul>

p0009These and other features of the claims removable will be explained in more detail below with reference to the accompanying diagrammatic drawings using an exemplary embodiment of the invention, to which the latter is not restricted.

p0010In the drawings:<dl id="dl0001"><dt>Figure 1-A and 1-B</dt><dd>the schematic embodiments of the device already described above,</dd><dt>figure 2</dt><dd>an example for the inventive sensing element,</dd><dt>figure 3</dt><dd>a detail of the inventive input head piece of the optical fiber bundle,</dd><dt>figure 4</dt><dd>an inventive separating element,</dd><dt>figure 5</dt><dd>the use of the separating element for shutting off the originating from inside the combustion chamber fuel gases (51 = device in an extended version; 52 = means in summary execution).</dd></dl>

p0011The arranged in the vicinity of the flame detecting element 11 for radiation is illustrated in more detail in the exemplary embodiment in Fig. 2. It consists essentially of two parts:<ul><li>a collimating lens 111 whose area allows recording of a desired amount of energy and the curvature is designed such that the lens, serving in consideration of the aberration, all of the evaluation of the combustion Nutzstrahlungen, namely ulttaviolette (wavelength 190-300 nm) to visible (400 - 750 nm) and infrared to Nutzstrahlungen (800-2500 nm), "geometric" in the region of the focal point brings together mm² on an area of ​​more than 3.5;</li><li>a protective sleeve 23, which receives the input head piece 121 at the geometric focus of the lens 111th</li></ul>

p0012The mutual position of the lens 111 and the entrance head piece 121 of the fiber bundle is secured by the bushing 23rd

p0013Two fixing members 241 and 242 fix the lens and the head piece in the predetermined position.

p0014The structure of the input head piece 121 is shown in detail in Fig. 3. This head is constructed such that it can withstand operating temperatures of about 300 ° C and peak temperatures of 450 ° C, and mechanical stresses that a in Fig 1-A with - due α α to + Marked swing.. The rotation is rigidly coupled with the movement of the torch body, so that no slippage occurs between the fiber bundle 122 and the protective sleeve. This feature ensures that the end face of the fiber bundle always in the focal point of the lens (Fig. 2) remains constant and is given the highest possible proportion of the light radiated by the flame and collected by the lens power.

p0015This is achieved by the cold state into the interior of the fiber bundle 122 inserted spreading element 22, the fibers away from each other and thus forms a position with expanded bundle diameter.

p0016In the space between the thus deformed fiber bundle and the supporting and protective sleeve 21 a liquid fast curing binder is then 25 poured under pressure that fixes after solidifying the fiber bundle in the desired position and at the same time prevents the above-mentioned slip.

p0017The transfer of radiation via said optical fiber bundle 122nd

p0018The optical fibers available on the market have, depending on the wavelength of the radiation on different radiation yields and Accordingly, the fiber bundle is constructed with such fibers whose properties are either depending on the desired wavelengths to be evaluated are the same or different from each other.

p0019In the present embodiment, different Lichtleitfasertypen come for transmitting ultraviolet or visible or infrared light signals for use.

p0020In this way a first separation of radiations.

p0021The separation of fibers with different light conductivity takes place at the output end of the fiber bundle (FIG. 4) which is intended for use at the ambient temperature.

p0022Thus the separation of the fibers and at the same time the mechanical fixing is achieved, a cylindrical metallic hollow body 123 (Fig. 4) is provided in the bottom of which are provided apertures. The latter serve to accommodate the individual components of the optical fiber bundle (which two components are denoted by 33 and 34 respectively) each with each other and homogeneous fibers of component to component light of different conductivity.

p0023The procedure provided for the optical resolution separation element 123 also serves to shut off the combustion gases, which otherwise from the interior of the combustion chamber into the container 14 (FIG. 5) could arrive which contains the sensors and associated amplifier circuits.

p0024This barrier prevents an explosion of fuel gas in the interior of the container fourteenth

p0025In order to achieve this result, the cylindrical hollow body 123 is completely filled with a liquid quick-setting binder 35th The Lichtleitfasen the receiving and separating the hollow body 123 is thus a solid cylindrical body.

p0026The perfect gas-tight barrier is achieved by insertion of an elastic seal 31 (Fig. 5) between the body 123 and the container 14.

p0027The fixing of the body 123 and the associated seal 31 is carried out by means of a threaded ring 32nd