DE1811627A1 - Duese with changeable passage cross-section - Google Patents

Description

Nozzle with variable passage cross-section

The invention relates to a nozzle, in particular a carburetor nozzle, with a variable passage cross section for regulation the amount of gas supplied to an internal combustion engine, for example.

In the known nozzles of this type, the change in the passage cross section is either by shifting a Rod that more or less exposes an opening, or is caused by a nozzle needle that is displaced when viewing its longitudinal axis in the interior of a suitable opening releases a variable cross-section.

The known nozzles with variable passage cross-section have the disadvantage that their characteristics change over time because they are subject to pollution and thereby an increasing reduction in the size of the passage cross-section occurs.

The object of the invention is to provide a nozzle with changeable To create Durchgangsquerschxtt in which the disadvantages of the known nozzles are avoided.

To solve this problem, according to a main characteristic of the invention, the passage cross section of the nozzle is through two limited thin walls, one wall of which is fixed and contains an opening that more or less through the other wall attached to a movable shoe

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is covered, the shoe being guided by elastic means is and on the one hand - against the fixed »wall and · on the other hand, against an organ for measuring the. size is printed showing the "change in the passage cross-section tes controls.

If the change in the passage cross section depends on from atmospheric pressure, "can as Control member an air pressure cell can be provided.

In a further embodiment of the invention there is both the Ί0 fixed as well as the movable wall from one Foil. The movable wall-jumps according to the; invention in relation to the shoe in the form of an edge laterally, in front of, so that the lower surface of this sand is an extension of the Shoe represents. .

According to a further feature of the invention, the elastic means can consist of two parallel elastic means Legs exist, which are attached to one end and at its other end with the shoe in such a connection stand that they have a sliding parallelogram with the shoe form.

In a preferred embodiment, the two elastic legs are the legs of a U-shaped spring _? which is attached with its curved part to a support, while the free ends of the parallel legs are bent over and engage in blind bores of the shoe in such a way that the spring action causes the shoe on the one hand in a direction perpendicular to the legs and on the other hand in one direction is loaded parallel to the wall ..

An embodiment of the invention is shown in the drawing and is explained in more detail below. Show it;

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1 shows a longitudinal section of the nozzle and FIG. 2 shows a plan view of the nozzle.

In the illustrated embodiment is in a support plate 1 a pipe socket 2 is provided for the incoming air, which flows in the direction of arrow f. The pipe socket is covered at its upper end by a foil 3 made of metal with a thickness of 0.1 to 0.2 mm. The slide 3 extends extending over the upper surface of a lug 4. In the film 3 there is an opening 5 in a desired shape, e.g. a narrow gap of constant or variable width, included in order to achieve the desired behavior of changing the To achieve passage cross-section as a function of the changes in the measured variable.

Above the fixed foil 3, a shoe 6 can move on the surface of the foil, which is covered on its underside with a second foil 7 made of metal with a thickness of 0.1 to 0.2 mm. The sheet 7 is opposed to the shoe 6 about and slides on the fixed film, wherein the opening is more or less 5 verschlos ^se n.

The shoe 6 is in the desired position by a spring 8 in the form of a U-shaped needle with two parallel Legs held, the ends 9 being bent and engaging in two blind bores 19 of the shoe 6.

The curved section 1 of the spring is embedded in a carrier 12 made of plastic, which has a contact surface on one side 13 which rests against a shoulder 14 of a support 15 of the support plate 1. This training serves to Locking of the carrier 12 in the desired position. For a screw bolt 16 is provided for its attachment.

The spring 8 has two tasks:

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- Zj- -

On the one hand, it stresses the shoe 6 in the direction from above down in such a way that the movable film 7 a Has the best possible contact with the fixed film 3.

On the other hand, it presses the shoe 6 against a rod 17 a device 18 for measuring the size that the change of the passage cross-section controls. For example, if if this measurand is atmospheric pressure, so it acts the device 18 is a load cell for measuring the atmospheric Pressure located within a housing 19 connected to the support plate 1.

The opening cross-section for the incoming air is limited by the circumference of the released part of the opening 5 and by the edge 20 of the movable film 7, which is attached to the shoe 6. This scope is thus only formed by the sections of thin foils that oppose Soiling is insensitive. .

In addition, the movable film 7 »the opposite to the Shoe 6 protrudes, like a scraper acts when the shoe is moved in the sense of closing the opening 5, so that impurities that may be attached to the fixed Slide 3 are to be removed and thus a good one Maintain contact between the two thin foils 3 and 7 will.

The contact between the foils is also ensured by the Pressure difference due to the pressure loss during the flow the air through the opening improves. The part of the opening that is not closed creates a suction effect through which the two foils are pressed together.

Another advantage results from the shape of the U-shaped Spring 8, which with its two legs form a parallel

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gram with curved sides, so that the shoe 6, without the need for a special guide, moves parallel to itself.

The invention is not limited to the illustrated embodiment, but can also be used in other ways will.

In a modified embodiment, the shoe and the attached film consist of a single piece of plastic with a thin on the bottom Has lip that forms the scraper and thus fulfills the same function as the thin film.

Patent claims

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Claims (1)

Claims 1. Nozzle, in particular. Carburetor nozzle, with changeable Passage cross-section that you draw raw ge k en η that the passage cross-section through two thin walls (3, 7) is limited »one of which Wall (3) is stationary and contains an opening 0), which is more or less covered by the other wall (7) attached to a "movable shoe (6)", wherein the shoe (6) is guided by elastic means (8) and on the one hand against the fixed wall (3) .sowie on the other hand, it is printed against a member (17) for measuring the size, which is the change in the passage cross-section controls, -., ■ "■ -". , " 2. Nozzle nach.Anspruch 1, characterized _? that the fixed wall (3) consists of a polie. ' 3 · nozzle according to claim 2, characterized _s that said movable wall (7) - consists of a .The film which is fixed under the shoe (6). 4-, nozzle according to claim 1, characterized in that the movable wall (7) in relation to the shoe (6) in shape a thin edge protrudes laterally, so that the lower Surface of this edge forms an extension of the shoe (6), 5. Nozzle according to claim 1 _3, characterized in that the elastic means (8) contain two parallel elastic legs which are attached at one end and which are connected to the shoe (6) at their other end, the legs with the shoe (6) form a displaceable parallelogram. 6. Nozzle according to claim 5, characterized _? that the 983-27.09 two elastic legs are formed by the legs of a U-shaped spring, which are bent with their Part (11) is attached to a bracket (12, 14), while the ends of the parallel legs are bent and in Blind bores (10) of the shoe (6) engage in such a way that the shoe (δ) by the spring action on the one hand in a Direction perpendicular to the legs and on the other hand in a direction parallel to the wall (3) is loaded. 9Q9832 / 0934 Blank page