DE3225554A1 - Measuring device for fluid jets - Google Patents

Abstract

A device for determining the characteristics of a fluid jet emerging from a nozzle (12) consists of a capacitor (K). When the jet passes through this capacitor, the dielectric constant of the capacitor changes, and the resultant change and measurement of the charge voltage allow conclusions to be drawn about the characteristic of the jet. Suitable constructions of capacitors make it possible to determine correctly the direction, the vibration characteristic and the consistency of the jet, for example of the fuel jet emerging from an injection nozzle. <IMAGE>

Description

Measuring device for fluid jets PRIOR ART The invention works from a device according to the preamble of the main claim. 3one like that In known devices, laser beams are used, such as the shape especially cross-sectional shape, or to measure the direction of a fluid jet. One Such a device is complex because the equipment required for this is expensive.

Advantages of the invention The device according to the invention with the characterizing Features of the main claim has the advantage that it is very simple, is cheap and accurate.

The measures listed in the subclaims are further developments the features specified in the main claim possible.

Drawing An embodiment of the invention is in the drawing and explained in more detail in the following description. It show the Figures 1 to 4 schematic sketches of sensors, Figures 4 to 9 applications of these Sensors.

Description of the exemplary embodiment In FIG. 1 there are nit 10 and 11 denotes the two disks of a plate capacitor K, between which a constant Distance d prevails. The capacitance C of the capacitor depends on the voltage applied among other things, substantially on the 3 -electricity constant of the dielectric between the Disks off, e.g. B. Air. One emerging from a nozzle 12 and between the panes 10, 11 penetrating @ liquid jet changes the dielectric constant and thus the charge Q of the capacitor K. The change in the charge voltage can be as Provide information about the nature of the jet, for example how high it should be Proportion of liquid and air.

The capacitor according to FIG. 2 consists instead of two flat disks of two short pieces of pipe arranged concentrically to one another in the same plane 14, 15, which also have a constant distance d from one another.

The electrical connection 15 leads through an arranged on the earpiece 15 Insulating body 17. The electrical one Symbol of this capacitor is shown in Figure 2 and is identical to that of Figure 1. On a Use of such a or modified capacitor is discussed further below.

In the embodiment of Figure 3, the capacitor K consists of three arranged in the same plane, concentric pipe sections 19 to 21, the have a certain, constant distance between them, the Distance between the pipe pieces 19, 20 can be different than between the pipe pieces 20, 21, but then each is constant. Figure 3a shows the electrical symbol of this Capacitor.

The exemplary embodiment is particularly well suited for beam measurement according to FIG. 4. The capacitor K in turn consists of an outer pipe section 23 and four concentric, lying in the same plane and similar to the same large concentrically arranged pipe segments 24 to 27 that do not touch each other, but have a constant distance from the outer pipe section 23. The electrical symbol for this capacitor is shown in Figure 4a. The individual pipe segments have each with its own electrical connection as in the exemplary embodiment according to FIG 2 on. Instead of four inner segments, only two or three can of course be provided be.

The exemplary embodiments show the use of such a capacitor according to Figure 5, 6 and 7. If a jet of liquid emerges from the nozzle 12, which the If the capacitor penetrates concentrically, the dielectric constant is between the individual pipe segments 24 oss 27 and aem outer pipe section 23 the same.

If the jet of liquid is not concentric, it gives way For example, as shown in FIG. 6, it turns to the left and penetrates the Area between the segment 24 and the pipe section 23 is much stronger than on the other segments, the dielectric constant changes between the pipe segment 24 and the pipe section 23 opposite that between the other pipe segments and the pipe section 23, i.e. by measuring the charging voltage @ r, information about the deviation of the liquid jet from the central direction.

The exemplary embodiment according to FIG. 7 shows the evasion of the liquid jet to the opposite side, so that the dielectric constant is now between the pipe segments 26 and the pipe section 23 changes. From the deviating The charging voltage compared to the other pipe segments is again provided with information about the direction of the beam.

The exemplary embodiment according to FIG. 8 shows a nozzle 30 with two injection openings 31, 32 and two capacitors K1, K2 according to the embodiment of Figure 2. The Capacitors Kl and K2 are arranged at a distance from the nozzle 30 so that a below The liquid jet exiting at the correct angles CC 2 and CQ 3 centrically the capacitors K1 and R2 penetrates. The rays deviate from the specified direction changes the dielectric constant at the capacitors, whereby in turn a deviation signal is generated.

In the embodiment of Figure 9, the capacitor K consists of two concentric, closed pipe sections 35, 36 lying in the same plane and ver inner angular segments 37 to 39 the one cross form. The direction of the liquid jet emerging from the nozzle 12 rira through the pipe sections 35-36 measured, the jet distribution and thus the Schnerr behavior of the nozzle by the dielectric constant between the angular segments and the inner pipe section 36.

The proposed sensor is particularly suitable for measuring Jets of liquid emerging from injection nozzles both in the direction and in the direction also the distribution of the liquid components in the jet itself. Further modifications can easily be derived from the knowledge of the above-mentioned exemplary embodiments. the Change in the state of charge of the capacitors in the exemplary embodiments described can be easily determined by measuring the charging voltage and in a corresponding Represent device, e.g. B. in the form of digital or analog measured values. Here a Evaluation electronics are used.

Claims (7)

Claims 1. Device for determining the properties of a Fluid-containing jet, vie direction, 5-jet mandrel, Kons @ ste @ z, with the help of a Sensor, characterized in that the sensor is a capacitor (K) whose Change in the state of charge when the beam passes through as a result of a change in the dielectric constant is measured. 2. Device according to claim 1, characterized in that the capacitor is a plate capacitor. 3. Device according to claim 1, characterized in that the capacitor of at least two lying in the same plane and arranged at a radial distance concentric pipe pieces (14, 15). 4. Device according to claim 1 and 3, characterized in that one of the pipe sections is divided into several segments (24 to 27), in particular in four segments. 5. Device according to claim 1, 3 and 4, characterized in that one of the pipe pieces is subdivided into a plurality of segments, in particular the inner one 6 .. Device according to one of Claims 1 to 5, characterized in that the Condenser made of two concentric pieces of pipe arranged in the same plane (35, 36) consists of several cross-like within the inner pipe section arranged and made of bent sheets at an angle, the third capacitor part. 7. Device according to one of claims 1 to 6, characterized in that that for several jets emerging from a nozzle at an angle just as many Capacitors are arranged.